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Data Sheet May 20, 2009
Micro TLynxTM: Non-Isolated DC-DC Power Modules: 2.4Vdc -5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A Output Current
Features
Compliant to RoHS EU Directive 2002/95/EC (Z versions) Compatible in a Pb-free or SnPb reflow environment (Z versions) Wide Input voltage range (2.4Vdc-5.5Vdc) Output voltage programmable from 0.6Vdc to 3.63 Vdc via external resistor Tunable Loop to optimize dynamic output voltage response Flexible output voltage sequencing EZSEQUENCE - APTH versions Remote sense
TM
RoHS Compliant
EZ-SEQUENCETM
Applications
Distributed power architectures Intermediate bus voltage applications Telecommunications equipment Servers and storage applications Networking equipment Industrial equipment
Vin+ VIN VOUT SENSE
RTUNE
Fixed switching frequency Output overcurrent protection (non-latching) Overtemperature protection Remote On/Off Ability to sink and source current Cost efficient open frame design Small size:
Vout+
20.3 mm x 11.4 mm x 8.5 mm (0.8 in x 0.45 in x 0.334 in)
Wide operating temperature range (-40C to 85C) UL* 60950-1Recognized, CSA C22.2 No. 60950-1-03 Certified, and VDE 0805:2001-12 (EN60950-1) Licensed
MODULE
Cin
SEQ
CTUNE Q1
Co
ON/OFF GND
TRIM
RTrim
ISO** 9001 and ISO 14001 certified manufacturing facilities
Description
The Micro TLynx series of power modules are non-isolated dc-dc converters that can deliver up to 12A of output current. These modules operate over a wide range of input voltage (VIN = 2.4Vdc-5.5Vdc) and provide a precisely regulated output voltage from 0.6Vdc to 3.63Vdc, programmable via an external resistor. Features include remote On/Off, adjustable output voltage, over current and overtemperature protection, and output voltage sequencing (APTH versions). A new feature, the Tunable LoopTM, allows the user to optimize the dynamic response of the converter to match the load with reduced amount of output capacitance leading to savings on cost and PWB area.
* UL is a registered trademark of Underwriters Laboratories, Inc.

TM
CSA is a registered trademark of Canadian Standards Association. VDE is a trademark of Verband Deutscher Elektrotechniker e.V. ** ISO is a registered trademark of the International Organization of Standards
Document No: DS07-007 ver. 1.11 PDF name: APTH012A0X_ds.pdf
Preliminary Data Sheet May 20, 2009
Austin MicroTLynx: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect the device reliability.
Parameter Input Voltage Continuous Sequencing Voltage Operating Ambient Temperature (see Thermal Considerations section) Storage Temperature All Tstg -55 125 C APTH All VSEQ TA -0.3 -40 ViN, Max 85 Vdc C Device All Symbol VIN Min -0.3 Max 6 Unit Vdc
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.
Parameter Operating Input Voltage Maximum Input Current (VIN=2.4V to 5.5V, IO=IO, max ) Input No Load Current (VIN = 5.0Vdc, IO = 0, module enabled) Input Stand-by Current (VIN = 5.0Vdc, module disabled) Inrush Transient Input Reflected Ripple Current, peak-to-peak (5Hz to 20MHz, 1H source impedance; VIN =0 to 5.5V, IO= IOmax ; See Test Configurations) Input Ripple Rejection (120Hz) All All All It 49 -30
2
Device All All VO,set = 0.6 Vdc VO,set = 3.3Vdc All
Symbol VIN IIN,max IIN,No load IIN,No load IIN,stand-by
Min 2.4
Typ
Max 5.5 11A
Unit Vdc Adc mA mA mA
36 81 3
1
As mAp-p dB
2
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Electrical Specifications (continued)
Parameter Output Voltage Set-point Output Voltage (Over all operating input voltage, resistive load, and temperature conditions until end of life) Adjustment Range Selected by an external resistor Output Regulation (for VO 2.5Vdc) Line (VIN=VIN, min to VIN, max) Load (IO=IO, min to IO, max) Output Regulation (for VO < 2.5Vdc) Line (VIN=VIN, min to VIN, max) Load (IO=IO, min to IO, max) Temperature (Tref=TA, min to TA, max) Remote Sense Range Output Ripple and Noise on nominal output (VIN=VIN, nom and IO=IO, min to IO, max Co = 0.1F // 10 F ceramic capacitors) Peak-to-Peak (5Hz to 20MHz bandwidth) RMS (5Hz to 20MHz bandwidth) External Capacitance ESR 1 m With the Tunable Loop ESR 0.15 m ESR 10 m Output Current Output Current Limit Inception (Hiccup Mode ) Output Short-Circuit Current (VO250mV) ( Hiccup Mode ) Efficiency VIN= 3.3Vdc, TA=25C IO=IO, max , VO= VO,set Vin=5Vdc Switching Frequency
1 TM 1 TM
Device All All
Symbol VO, set VO, set
Min -1.5 -3.0
Typ
Max +1.5
Unit % VO, set % VO, set
+3.0
All
VO
0.6
3.63
Vdc
All All All All All All

0.4 10 10 5 0.4 0.5
% VO, set mV mV mV % VO, set V
All All

25 10
35 15
mVpk-pk mVrms
Without the Tunable Loop
All All All All All All VO,set = 0.6Vdc VO, set = 1.2Vdc VO,set = 1.8Vdc VO,set = 2.5Vdc VO,set = 3.3Vdc All
TM
CO, max CO, max CO, max Io IO, lim IO, s/c fsw
0 0 0 0

200 1000 5000 12 200
F F F Adc % Io,max % Io,max % % % % %
30 75.0 85.5 89.9 92.7 94.6 600
kHz
External capacitors may require using the new Tunable Loop feature to ensure that the module is stable as well as TM getting the best transient response. See the Tunable Loop section for details.
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
General Specifications
Parameter Calculated MTBF (IO=IO, max, TA=25C) Telecordia Issue 2, Method 1 Case 3 Weight Min Typ 28,160,677 3.59 (0.127) Max Unit Hours g (oz.)
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature Descriptions for additional information.
Parameter On/Off Signal Interface (VIN=VIN, min to VIN, max ; open collector or equivalent, Signal referenced to GND) Device is with suffix "4" - Positive Logic (See Ordering Information) Logic High (Module ON) Input High Current Input High Voltage Logic Low (Module OFF) Input Low Current Input Low Voltage Device Code with no suffix - Negative Logic (See Ordering Information) (On/OFF pin is open collector/drain logic input with external pull-up resistor; signal referenced to GND) Logic High (Module OFF) Input High Current Input High Voltage Logic Low (Module ON) Input low Current Input Low Voltage Turn-On Delay and Rise Times (VIN=VIN, nom, IO=IO, max , VO to within 1% of steady state) Case 1: On/Off input is enabled and then input power is applied (delay from instant at which VIN = VIN, min until Vo = 10% of Vo, set) Case 2: Input power is applied for at least one second and then the On/Off input is enabled (delay from instant at which Von/Off is enabled until Vo = 10% of Vo, set) Output voltage Rise time (time for Vo to rise from 10% of Vo, set to 90% of Vo, set) Output voltage overshoot (TA = 25 C VIN= VIN, min to VIN, max,IO = IO, min to IO, max) With or without maximum external capacitance Over Temperature Protection (See Thermal Considerations section) Sequencing Delay time Delay from VIN, min to application of voltage on SEQ pin Tracking Accuracy (Power-Up: 2V/ms) (Power-Down: 2V/ms) (VIN, min to VIN, max; IO, min to IO, max VSEQ < Vo) APTH APTHl APTH TsEQ-delay VSEQ -Vo VSEQ -Vo 10 100 100 msec mV mV All Tref 130 C
o
Devic e
Symbol
Min
Typ
Max
Unit
All All All All
IIH VIH IIL VIL
VIN - 1.6 -0.3

10 VIN,max 1 VIN - 0.8
A V mA V
All All All All
IIH VIH IIL VIL
VIN - 1.6 -0.2

1 VIN, max 10 VIN - 0.8
mA Vdc A Vdc
All
Tdelay
2
msec
All
Tdelay
2
msec
All
Trise
5
3.0
msec % VO,
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Feature Specifications (continued)
Parameter Input Undervoltage Lockout Turn-on Threshold Turn-off Threshold Hysteresis All All All 1.75 0.08 0.2 2.2 Vdc Vdc Vdc Device Symbol Min Typ Max Units
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Characteristic Curves
The following figures provide typical characteristics for the Micro TLynxTM at 0.6Vo and at 25oC.
90
13 12 11 10 9 8 25 35 45 55 65
O
85
OUTPUT CURRENT, Io (A)
EFFICIENCY, (%)
80 Vin=2.4V 75 Vin=3.3V Vin=5.5V 70 0 2 4 6 8 10 12
2m/s (400LFM)
1m/s (200LFM) 0.5m/s (100LFM) NC
75
85
OUTPUT CURRENT, IO (A)
AMBIENT TEMPERATURE, TA C
Figure 1. Converter Efficiency versus Output Current.
Figure 2. Derating Output Current versus Ambient Temperature and Airflow.
OUTPUT VOLTAGE OUTPUT CURRENT, VO (V) (200mV/div) IO (A) (5Adiv)
OUTPUT VOLTAGE
VO (V) (10mV/div)
TIME, t (1s/div)
TIME, t (20s /div)
Figure 3. Typical output ripple and noise (VIN = 5V, Io = Io,max).
OUTPUT VOLTAGE VO (V) (200mV/div)
Figure 4. Transient Response to Dynamic Load Change from 0% to 50% to 0% with VIN=5V.
OUTPUT VOLTAGE INPUT VOLTAGE
ON/OFF VOLTAGE
VON/OFF (V) (2V/div)
TIME, t (1ms/div)
VIN (V) (2V/div)
VO (V) (200mV/div)
TIME, t (1ms/div)
Figure 5. Typical Start-up Using On/Off Voltage (Io = Io,max).
Figure 6. Typical Start-up Using Input Voltage (VIN = 5V, Io = Io,max).
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Characteristic Curves (continued)
The following figures provide typical characteristics for the Micro TLynx
95
TM
at 1.2Vo and at 25 C.
o
13
OUTPUT CURRENT, Io (A)
90
12
EFFICIENCY, (%)
85 Vin=2.4V 80 Vin=3.3V Vin=5.5V
11
2m/s (400LFM)
10
1m/s (200LFM) 0.5m/s (100LFM) NC
75
9
70 0 2 4 6 8 10 12
8 25 35 45 55 65
O
75
85
OUTPUT CURRENT, IO (A)
AMBIENT TEMPERATURE, TA C
Figure 7. Converter Efficiency versus Output Current.
Figure 8. Derating Output Current versus Ambient Temperature and Airflow.
OUTPUT VOLTAGE OUTPUT CURRENT, VO (V) (200mV/div) IO (A) (5Adiv)
OUTPUT VOLTAGE
VO (V) (10mV/div)
TIME, t (1s/div)
TIME, t (20s /div)
Figure 9. Typical output ripple and noise (VIN = 5V, Io = Io,max).
OUTPUT VOLTAGE
Figure 10. Transient Response to Dynamic Load Change from 0% to 50% to 0% with VIN=5V.
OUTPUT VOLTAGE INPUT VOLTAGE
VO (V) (500mV/div)
ON/OFF VOLTAGE
VON/OFF (V) (2V/div)
TIME, t (1ms/div)
VIN (V) (2V/div)
VO (V) (500mV/div)
TIME, t (1ms/div)
Figure 11. Typical Start-up Using On/Off Voltage (Io = Io,max).
Figure 12. Typical Start-up Using Input Voltage (VIN = 5V, Io = Io,max).
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Characteristic Curves (continued)
The following figures provide typical characteristics for the Micro TLynxTM at 1.8Vo and at 25oC.
100 95
13
90 85 80 75 70 0 2 4 6 8 10 12 Vin=2.4V
OUTPUT CURRENT, Io (A)
12
EFFICIENCY, (%)
11
Vin=3.3V Vin=5.5V
2m/s (400LFM)
10
1m/s (200LFM) 0.5m/s (100LFM) NC
9
8 25 35 45 55 65
O
75
85
OUTPUT CURRENT, IO (A)
AMBIENT TEMPERATURE, TA C
Figure 13. Converter Efficiency versus Output Current.
Figure 14. Derating Output Current versus Ambient Temperature and Airflow.
OUTPUT VOLTAGE OUTPUT CURRENT, VO (V) (200mV/div) IO (A) (2Adiv)
OUTPUT VOLTAGE
VO (V) (10mV/div)
TIME, t (1s/div)
TIME, t (20s /div)
Figure 15. Typical output ripple and noise (VIN = 5V, Io = Io,max).
OUTPUT VOLTAGE
Figure 16. Transient Response to Dynamic Load Change from 0% to 50% to 0% with VIN=5V.
OUTPUT VOLTAGE INPUT VOLTAGE
VO (V) (500mV/div)
ON/OFF VOLTAGE
VON/OFF (V) (2V/div)
TIME, t (1ms/div)
VIN (V) (2V/div)
VO (V) (1V/div)
TIME, t (1ms/div)
Figure 17. Typical Start-up Using On/Off Voltage (Io = Io,max).
Figure 18. Typical Start-up Using Input Voltage (VIN = 5V, Io = Io,max).
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Characteristic Curves (continued)
The following figures provide typical characteristics for the Micro TLynx
100
13
TM
at 2.5Vo and at 25 C.
o
95
OUTPUT CURRENT, Io (A)
12
EFFICIENCY, (%)
11
90
Vin=5.5V
Vin=3V Vin=3.3V
2m/s (400LFM)
10
1m/s (200LFM) 0.5m/s (100LFM)
85
9
NC
80 0 2 4 6 8 10 12
8 25 35 45 55 65
O
75
85
OUTPUT CURRENT, IO (A)
AMBIENT TEMPERATURE, TA C
Figure 19. Converter Efficiency versus Output Current.
Figure 20. Derating Output Current versus Ambient Temperature and Airflow.
OUTPUT VOLTAGE OUTPUT CURRENT, VO (V) (200mV/div) IO (A) (5Adiv)
OUTPUT VOLTAGE
VO (V) (0mV/div)
TIME, t (1s/div)
TIME, t (20s /div)
Figure 21. Typical output ripple and noise (VIN = 5V, Io = Io,max).
OUTPUT VOLTAGE
Figure 22. Transient Response to Dynamic Load Change from 0% to 50% to 0% with VIN=5V.
OUTPUT VOLTAGE INPUT VOLTAGE
VO (V) (1V/div)
ON/OFF VOLTAGE
VON/OFF (V) (5V/div)
TIME, t (1ms/div)
VIN (V) (2V/div)
VO (V) (1V/div)
TIME, t (1ms/div)
Figure 23. Typical Start-up Using On/Off Voltage (Io = Io,max).
Figure 24. Typical Start-up Using Input Voltage (VIN = 5V, Io = Io,max).
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Characteristic Curves (continued)
The following figures provide typical characteristics for the Micro TLynxTM at 3.3Vo and at 25oC.
100
13
95
OUTPUT CURRENT, Io (A)
12
EFFICIENCY, (%)
Vin=5.5V 90
Vin=5V
11
Vin=4.5V
2m/s (400LFM)
10
1m/s (200LFM) 0.5m/s (100LFM) NC
85
9
80 0 2 4 6 8 10 12
8 25 35 45 55 65
O
75
85
OUTPUT CURRENT, IO (A)
AMBIENT TEMPERATURE, TA C
Figure 25. Converter Efficiency versus Output Current.
Figure 26. Derating Output Current versus Ambient Temperature and Airflow.
OUTPUT VOLTAGE OUTPUT CURRENT, VO (V) (200mV/div) IO (A) (5Adiv)
OUTPUT VOLTAGE
VO (V) (10mV/div)
TIME, t (1s/div)
TIME, t (20s /div)
Figure 27. Typical output ripple and noise (VIN = 5V, Io = Io,max).
OUTPUT VOLTAGE
Figure 28. Transient Response to Dynamic Load Change from 0% 50% to 0% with VIN=5V.
OUTPUT VOLTAGE INPUT VOLTAGE
VO (V) (1V/div)
ON/OFF VOLTAGE
VON/OFF (V) (2V/div)
TIME, t (1ms/div)
VIN (V) (2V/div)
VO (V) (1V/div)
TIME, t (1ms/div)
Figure 29. Typical Start-up Using On/Off Voltage (Io = Io,max).
Figure 30. Typical Start-up Using Input Voltage (VIN = 5V, Io = Io,max).
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Test Configurations
TO OSCILLOSCOPE LTEST 1H VIN(+) CURRENT PROBE
Design Considerations
Input Filtering
The Micro TLynx module should be connected to a low ac-impedance source. A highly inductive source can affect the stability of the module. An input capacitance must be placed directly adjacent to the input pin of the module, to minimize input ripple voltage and ensure module stability. To minimize input voltage ripple, low-ESR ceramic capacitors are recommended at the input of the module. Figure 34 shows the input ripple voltage for various output voltages at 3A of load current with 1x47 F or 2x47 F ceramic capacitors and an input of 5V. Figure 35 shows data for the 3.3Vin case, with 1x47F or 2x37F of ceramic capacitors at the input.
140 120 100 80
RESISTIVE LOAD
TM
BATTERY
CS 1000F Electrolytic E.S.R.<0.1 @ 20C 100kHz
CIN 2x100F Tantalum COM
NOTE: Measure input reflected ripple current with a simulated source inductance (LTEST) of 1H. Capacitor CS offsets possible battery impedance. Measure current as shown above.
Figure 31. Input Reflected Ripple Current Test Setup.
COPPER STRIP
Vo+ 0.1uF COM 10uF
60 40 20 1x47uF 2x47uF 0.5 1 1.5 2 2.5 3 3.5
SCOPE USING BNC SOCKET GROUND PLANE NOTE: All voltage measurements to be taken at the module terminals, as shown above. If sockets are used then Kelvin connections are required at the module terminals to avoid measurement errors due to socket contact resistance.
0
Figure 32. Output Ripple and Noise Test Setup.
Figure 34. Input ripple voltage for various output voltages with 1x47 F or 2x47 F ceramic capacitors at the input (12A load). Input voltage is 5V.
120
Rdistribution
Rcontact VIN(+) VO
Rcontact
Rdistribution
100 80
VIN
VO
RLOAD
60 40 20 1x47uF 2x47uF 0.5 1 1.5 2 2.5 3
Rdistribution
Rcontact COM COM
Rcontact
Rdistribution
NOTE: All voltage measurements to be taken at the module terminals, as shown above. If sockets are used then Kelvin connections are required at the module terminals to avoid measurement errors due to socket contact resistance.
0
Figure 33. Output Voltage and Efficiency Test Setup.
VO. IO Efficiency = VIN. IIN x 100 %
Figure 35. Input ripple voltage in mV, p-p for various output voltages with 1x47 F or 2x47 F ceramic capacitors at the input (12A load). Input voltage is 3.3V.
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Data Sheet May 20, 2009
Output Filtering
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
15
The Micro TLynxTM modules are designed for low output ripple voltage and will meet the maximum output ripple specification with 0.1 F ceramic and 10 F ceramic capacitors at the output of the module. However, additional output filtering may be required by the system designer for a number of reasons. First, there may be a need to further reduce the output ripple and noise of the module. Second, the dynamic response characteristics may need to be customized to a particular load step change. To reduce the output ripple and improve the dynamic response to a step load change, additional capacitance at the output can be used. Low ESR ceramic and polymer capacitors are recommended to improve the dynamic response of the module. Figure 36 provides output ripple information for different external capacitance values at various Vo and for load currents of 12A while maintaining an input voltage of 5V. Fig 37 shows the performance with a 3.3V input. For stable operation of the module, limit the capacitance to less than the maximum output capacitance as specified in the electrical specification table. Optimal performance of the module can be achieved by using the Tunable TM Loop feature described later in this data sheet.
15
Ripple(mVp-p)
10
1x10uF External Cap 1x47uF External Cap 2x47uF External Cap 4x47uF External Cap
5
0 0.5 1 1.5 2 Output Voltage(Volts) 2.5 3
Figure 37. Output ripple voltage for various output voltages with external 1x10 F, 1x47 F, 2x47 F or 4x47 F ceramic capacitors at the output (12A load). Input voltage is 3.3V.
Safety Considerations
For safety agency approval the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standards, i.e., UL 60950-1, CSA C22.2 No. 60950-1-03, and VDE 0850:2001-12 (EN60950-1) Licensed. For the converter output to be considered meeting the requirements of safety extra-low voltage (SELV), the input must meet SELV requirements. The power module has extra-low voltage (ELV) outputs when all inputs are ELV.
Ripple(mVp-p)
10
1x10uF External Cap 1x47uF External Cap 2x47uF External Cap 4x47uF External Cap
5
Feature Descriptions
Remote On/Off
The Micro TLynx modules feature an On/Off pin for remote On/Off operation. Two On/Off logic options are available. In the Positive Logic On/Off option, (device code suffix "4" - see Ordering Information), the module turns ON during a logic High on the On/Off pin and turns OFF during a logic Low. With the Negative Logic On/Off option, (no device code suffix, see Ordering Information), the module turns OFF during logic High and ON during logic Low. The On/Off signal is always referenced to ground. For either On/Off logic option, leaving the On/Off pin disconnected will turn the module ON when input voltage is present. For positive logic modules, the circuit configuration for using the On/Off pin is shown in Figure 38. For positive logic modules, the circuit configuration for using the On/Off pin is shown in Figure 38. When the external transistor Q1 is in the OFF state, Q2 is ON, the internal PWM Enable signal is pulled low and the module is ON. When transistor Q1 is turned ON, the On/Off pin is
TM
0 0.5 1 1.5 2 2.5 3 3.5
Output Voltage(Volts)
Figure 36. Output ripple voltage for various output voltages with external 1x10 F, 1x47 F, 2x47 F or 4x47 F ceramic capacitors at the output (12A load). Input voltage is 5V.
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
pulled low, Q2 is turned off and the internal PWM Enable signal is pulled high through the 23.7K pull-up resistor and the module is OFF.
VIN+
unit enters hiccup mode. The unit operates normally once the output current is brought back into its specified range.
MODULE
23.7K 20K 470 Q2 PWM Enable
Overtemperature Protection
To provide protection in a fault condition, the unit is equipped with a thermal shutdown circuit. The unit will shutdown if the overtemperature threshold of 130oC is exceeded at the thermal reference point Tref . The thermal shutdown is not intended as a guarantee that the unit will survive temperatures beyond its rating. Once the unit goes into thermal shutdown it will then wait to cool before attempting to restart.
I ON/OFF ON/OFF Q1 + VON/OFF _ GND 20K
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout limit, the module operation is disabled. The module will begin to operate at an input voltage above the undervoltage lockout turn-on threshold.
Figure 38. Circuit configuration for using positive On/Off logic. For negative logic On/Off modules, the circuit configuration is shown in Fig. 39. The On/Off pin should be pulled high with an external pull-up resistor (suggested value for the 2.4V to 5.5Vin range is 3Kohms). When transistor Q1 is in the OFF state, the On/Off pin is pulled high and the module is OFF. The On/Off threshold for logic High on the On/Off pin depends on the input voltage and its minimum value is VIN - 1.6V. To turn the module ON, Q1 is turned ON pulling the On/Off pin low.
VIN+
Output Voltage Programming
The output voltage of the Micro TLynx module can be programmed to any voltage from 0.6dc to 3.63Vdc by connecting a resistor between the Trim+ and GND pins of the module. Certain restrictions apply on the output voltage set point depending on the input voltage. These are shown in the Output Voltage vs. Input Voltage Set Point Area plot in Fig. 40. The Upper Limit curve shows that the entire output voltage range is available with the maximum input voltage of 5.5V. The Lower Limit curve shows that for output voltages of 1.8V and higher, the input voltage needs to be larger than the minimum of 2.4V.
6 5
Upper Limit
TM
MODULE
Rpullup I ON/OFF 60.4K
Input Voltage (v)
4 3
Lower Limit
ON/OFF
VON/OFF Q1 20K _
+
R2
PWM Enable
2 1 0 0.5 1 1.5 2 2.5 3 3.5 4
GND
Output Voltage (V)
Figure 39. Circuit configuration for using negative On/Off logic.
Figure 40. Output Voltage vs. Input Voltage Set Point Area plot showing limits where the output voltage can be set for different input voltages. Without an external resistor between Trim+ and GND pins, the output of the module will be 0.6Vdc. To calculate the value of the trim resistor, Rtrim for a desired output voltage, use the following equation:
Overcurrent Protection
To provide protection in a fault (output overload) condition, the unit is equipped with internal current-limiting circuitry and can endure current limiting continuously. At the point of current-limit inception, the
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Voltage Margining
Output voltage margining can be implemented in the Micro TLynxTM modules by connecting a resistor, Rmarginup, from the Trim pin to the ground pin for margining-up the output voltage and by connecting a resistor, Rmargindown, from the Trim pin to output pin for margining-down. Figure 42 shows the circuit configuration for output voltage margining. The POL Programming Tool, available at www.lineagepower.com under the Design Tools section, also calculates the values of Rmargin-up and Rmargin-down for a specific output voltage and % margin Please consult your local Lineage Power technical representative for additional details.
Vo Rmargin-down
1.2 Rtrim = k (Vo - 0.6 )
Rtrim is the external resistor in k, and Vo is the desired output voltage. Table 1 provides Rtrim values required for some common output voltages.
Table 1
VO, set (V) 0.6 1.0 1.2 1.5 1.8 2.5 3.3 Rtrim (K) Open 3.0 2.0 1.333 1.0 0.632 0.444
MODULE
Q2
By using a 0.5% tolerance trim resistor with a TC of 25ppm, a set point tolerance of 1.5% can be achieved as specified in the electrical specification. The POL Programming Tool available at www.lineagepower.com under the Design Tools section, helps determine the required trim resistor needed for a specific output voltage.
VI N+ VO + SENSE ON/OFF TRIM LOAD Rtrim GND
Trim Rmargin-up Rtrim
Q1 GND
Figure 42. Circuit Configuration for margining Output voltage
Monotonic Start-up and Shutdown
The Micro TLynx modules have monotonic start-up and shutdown behavior for any combination of rated input voltage, output current and operating temperature range.
TM
Startup into Pre-biased Output
The 5.5V Pico TLynx 12A modules can start into a prebiased output as long as the prebias voltage is 0.5V less than the set output voltage. Note that prebias operation is not supported when output voltage sequencing is used.
TM
Figure 41. Circuit configuration for programming output voltage using an external resistor.
Remote Sense
The Micro TLynx modules have a Remote Sense feature to minimize the effects of distribution losses by regulating the voltage at the SENSE pin. The voltage between the SENSE pin and VOUT pin must not exceed 0.5V. Note that the output voltage of the module cannot exceed the specified maximum value. This includes the voltage drop between the SENSE and Vout pins. When the Remote Sense feature is not being used, connect the SENSE pin to the VOUT pin.
TM
Output Voltage Sequencing
The APTH012A0X modules include a sequencing feature, EZ-SEQUENCE that enables users to implement various types of output voltage sequencing in their applications. This is accomplished via an additional sequencing pin. When not using the sequencing feature, either tie the SEQ pin to VIN or leave it unconnected.
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
When an analog voltage is applied to the SEQ pin, the output voltage tracks this voltage until the output reaches the set-point voltage. The final value of the SEQ voltage must be set higher than the set-point voltage of the module. The output voltage follows the voltage on the SEQ pin on a one-to-one volt basis. By connecting multiple modules together, multiple modules can track their output voltages to the voltage applied on the SEQ pin. For proper voltage sequencing, first, input voltage is applied to the module. The On/Off pin of the module is left unconnected (or tied to GND for negative logic modules or tied to VIN for positive logic modules) so that the module is ON by default. After applying input voltage to the module, a minimum 10msec delay is required before applying voltage on the SEQ pin. This delay gives the module enough time to complete its internal power-up soft-start cycle. During the delay time, the SEQ pin should be held close to ground (nominally 50mV 20 mV). This is required to keep the internal opamp out of saturation thus preventing output overshoot during the start of the sequencing ramp. By selecting resistor R1 (see fig. 43) according to the following equation
voltage must be maintained until the tracking and output voltages reach ground potential. When using the EZ-SEQUENCE feature to control start-up of the module, pre-bias immunity during start-up is disabled. The pre-bias immunity feature of the module relies on the module being in the diode-mode TM during start-up. When using the EZ-SEQUENCE feature, modules goes through an internal set-up time of 10msec, and will be in synchronous rectification mode when the voltage at the SEQ pin is applied. This will result in the module sinking current if a pre-bias voltage is present at the output of the module. When pre-bias immunity during start-up is required, the EZTM SEQUENCE feature must be disabled. For additional guidelines on using the EZ-SEQUENCETM feature please refer to Application Note AN04-008 "Application Guidelines for Non-Isolated Converters: Guidelines for Sequencing of Multiple Modules", or contact the Lineage Power technical representative for additional information.
TM
R1 =
24950 ohms, V IN - 0.05
the voltage at the sequencing pin will be 50mV when the sequencing signal is at zero.
VIN+
MODULE
499K + R1 SEQ 10K OUT
GND
Figure 43. Circuit showing connection of the sequencing signal to the SEQ pin.
After the 10msec delay, an analog voltage is applied to the SEQ pin and the output voltage of the module will track this voltage on a one-to-one volt bases until the output reaches the set-point voltage. To initiate simultaneous shutdown of the modules, the SEQ pin voltage is lowered in a controlled manner. The output voltage of the modules tracks the voltages below their set-point voltages on a one-to-one basis. A valid input
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Data Sheet May 20, 2009
Tunable LoopTM
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
step change (50% of full load), with an input voltage of 5Vin and 3.3Vin respectively Please contact your Lineage Power technical representative to obtain more details of this feature as well as for guidelines on how to select the right value of external R-C to tune the module for best transient performance and stable operation for other output capacitance values or input voltages other than 5 or 3.3V. Table 2. General recommended values of of RTUNE and CTUNE for Vin=5V and various external ceramic capacitor combinations.
Cext RTUNE CTUNE 1x47F 47 1500pF 2x47F 47 3900pF 4x47F 47 10nF 10x47F 33 33nF 20x47F 22 56nF
The 5V Pico TLynx 12A modules have a new feature that optimizes transient response of the module called TM Tunable Loop . External capacitors are usually added to the output of the module for two reasons: to reduce output ripple and noise (see Figures 36 and 37) and to reduce output voltage deviations from the steady-state value in the presence of dynamic load current changes. Adding external capacitance however affects the voltage control loop of the module, typically causing the loop to slow down with sluggish response. Larger values of external capacitance could also cause the module to become unstable. The Tunable Loop allows the user to externally adjust the voltage control loop to match the filter network connected to the output of the module. The Tunable TM Loop is implemented by connecting a series R-C between the SENSE and TRIM pins of the module, as shown in Fig. 44. This R-C allows the user to externally adjust the voltage loop feedback compensation of the module. VOUT SENSE
RTUNE
TM
TM
Table 3. Recommended values of RTUNE and CTUNE to obtain transient deviation of 2% of Vout for a 6A step load with Vin=5V.
Vout 3.3V 2.5V 1.8V 1.2V 0.6V 6x330F Polymer Cap 33 220nF 12mV 1x47F 4x47F 4x47F 330F + 330F + 330F + 2x330F Cext Polymer Polymer Polymer Polymer Cap Cap Cap Cap RTUNE 56 15nF 66mV 33 18nF 49mV 33 27nF 35mV 33 47nF 24mV CTUNE V
MODULE
CTUNE
CO
TRIM GND
RTrim
Table 4. General recommended values of of RTUNE and CTUNE for Vin=3.3V and various external ceramic capacitor combinations.
Cext 1x47F 47 3300pF 2x47F 47 6800pF 4x47F 33 15nF 10x47F 33 47nF 20x47F 22 68nF RTUNE CTUNE
Figure. 44. Circuit diagram showing connection of RTUME and CTUNE to tune the control loop of the module. Recommended values of RTUNE and CTUNE for different output capacitor combinations are given in Tables 2, 3, 4 and 5. Tables 2 and 4 show the recommended values of RTUNE and CTUNE for different values of ceramic output capacitors up to 940F that might be needed for an application to meet output ripple and noise requirements for 5Vin and 3.3Vin respectively. Selecting RTUNE and CTUNE according to Table 2 will ensure stable operation of the module. In applications with tight output voltage limits in the presence of dynamic current loading, additional output capacitance will be required. Tables 3 and 5 list recommended values of RTUNE and CTUNE in order to meet 2% output voltage deviation limits for some common output voltages in the presence of a 1.5A to 3A
Table 5. Recommended values of RTUNE and CTUNE to obtain transient deviation of 2% of Vout for a 6A step load with Vin=3.3V.
Vout Cext RTUNE CTUNE V 2.5V 2 x 330F Polymer Cap 33 82nF 45mV 1.8V 2 x 330F Polymer Cap 33 100nF 32mV 1.2V 3 x 330F Polymer Cap 33 180nF 24mV 0.6V 7 x 330F Polymer Cap 33 390nF 12mV
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Thermal Considerations
Power modules operate in a variety of thermal environments; however, sufficient cooling should always be provided to help ensure reliable operation. Considerations include ambient temperature, airflow, module power dissipation, and the need for increased reliability. A reduction in the operating temperature of the module will result in an increase in reliability. The thermal data presented here is based on physical measurements taken in a wind tunnel. The test set-up is shown in Figure 45. The preferred airflow direction for the module is shown in Figure 46. Figure 46. Preferred airflow direction and location of hot-spot of the module (Tref).
Wind Tunnel PWBs
25.4_ (1.0)
Power Module
76.2_ (3.0)
x
12.7_ (0.50)
Probe Location for measuring airflow and ambient temperature
Air flow
Figure 45. Thermal Test Setup. The thermal reference points, Tref used in the specifications are shown in Figure 46. For reliable operation the temperatures at these points should not o exceed 125 C. The output power of the module should not exceed the rated power of the module (Vo,set x Io,max). Please refer to the Application Note "Thermal Characterization Process For Open-Frame BoardMounted Power Modules" for a detailed discussion of thermal aspects including maximum device temperatures.
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Example Application Circuit
Requirements: Vin: 3.3V Vout: 1.8V Iout: 9A max., worst case load transient is from 6A to 9A Vout: Vin, ripple 1.5% of Vout (27mV) for worst case load transient 1.5% of Vin (50mV, p-p)
CI1 CI2 CO1 CO2 CTune RTune RTrim
2 x 47F/6.3V ceramic capacitor (e.g. TDK C Series) 100F/6.3V Bulk Electrolytic 6 x 47F/6.3V ceramic capacitor (e.g. TDK C Series) 330F/6.3V Polymer/poscap (e.g. Sanyo Poscap) 56nF ceramic capacitor (can be 1206, 0805 or 0603 size) 33 ohms SMT resistor (can be 1206, 0805 or 0603 size) 1k SMT resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%)
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Mechanical Outline
Dimensions are in millimeters and (inches). Tolerances: x.x mm 0.5 mm (x.xx in. 0.02 in.) [unless otherwise indicated] x.xx mm 0.25 mm (x.xxx in 0.010 in.)
Side View
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Recommended Pad Layout
Dimensions are in millimeters and (inches). Tolerances: x.x mm 0.5 mm (x.xx in. 0.02 in.) [unless otherwise indicated] x.xx mm 0.25 mm (x.xxx in 0.010 in.)
PIN 8
PIN 4
PIN 10
PIN 9
PIN 1 2 3 4 5 6 7 8 9 10
FUNCTION ON/OFF VIN SEQ GND TRIM VOUT VS+ GND NC NC
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Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Packaging Details
The APTH012A0X modules are supplied in tape & reel as standard. Modules are shipped in quantities of 250 modules per reel. All Dimensions are in millimeters and (in inches).
Reel Dimensions: Outside Dimensions: Inside Dimensions: Tape Width: LINEAGE POWER
330.2 mm (13.00) 177.8 mm (7.00") 44.00 mm (1.732") 21
Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
package is broken, the floor life of the product at conditions of 30C and 60% relative humidity varies according to the MSL rating (see J-STD-033A). The shelf life for dry packed SMT packages will be a minimum of 12 months from the bag seal date, when stored at the following conditions: < 40 C, < 90% relative humidity.
300 Per J-STD-020 Rev. C Peak Temp 260C 250 Cooling Zone
Surface Mount Information
Pick and Place
The Micro TLynxTM modules use an open frame construction and are designed for a fully automated assembly process. The modules are fitted with a label designed to provide a large surface area for pick and place operations. The label meets all the requirements for surface mount processing, as well as safety standards, and is able to withstand reflow o temperatures of up to 300 C. The label also carries product information such as product code, serial number and the location of manufacture.
Reflow Temp (C)
200 * Min. Time Above 235C 15 Seconds Heating Zone 1C/Second *Time Above 217C 60 Seconds
150
Nozzle Recommendations
The module weight has been kept to a minimum by using open frame construction. Variables such as nozzle size, tip style, vacuum pressure and placement speed should be considered to optimize this process. The minimum recommended inside nozzle diameter for reliable operation is 3mm. The maximum nozzle outer diameter, which will safely fit within the allowable component spacing, is 7 mm.
100
50
0
Reflow Time (Seconds)
Figure 47. Recommended linear reflow profile using Sn/Ag/Cu solder.
Lead Free Soldering
The Micro TLynxTM modules are lead-free (Pb-free) and RoHS compliant and fully compatible in a Pb-free soldering process. Failure to observe the instructions below may result in the failure of or cause damage to the modules and can adversely affect long-term reliability.
Post Solder Cleaning and Drying Considerations
Post solder cleaning is usually the final circuit-board assembly process prior to electrical board testing. The result of inadequate cleaning and drying can affect both the reliability of a power module and the testability of the finished circuit-board assembly. For guidance on appropriate soldering, cleaning and drying procedures, refer to Board Mounted Power Modules: Soldering and Cleaning Application Note (AN04-001).
Pb-free Reflow Profile
Power Systems will comply with J-STD-020 Rev. C (Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices) for both Pb-free solder profiles and MSL classification procedures. This standard provides a recommended forced-air-convection reflow profile based on the volume and thickness of the package (table 4-2). The suggested Pb-free solder paste is Sn/Ag/Cu (SAC). The recommended linear reflow profile using Sn/Ag/Cu solder is shown in Fig. 47. Soldering outside of the recommended profile requires testing to verify results and performance.
MSL Rating
The Micro TLynxTM modules have a MSL rating of 2.
Storage and Handling
The recommended storage environment and handling procedures for moisture-sensitive surface mount packages is detailed in J-STD-033 Rev. A (Handling, Packing, Shipping and Use of Moisture/Reflow Sensitive Surface Mount Devices). Moisture barrier bags (MBB) with desiccant are required for MSL ratings of 2 or greater. These sealed packages should not be broken until time of use. Once the original LINEAGE POWER 22
Data Sheet May 20, 2009
Micro TLynxTM: Non-isolated DC-DC Power Modules: 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 12A output current
Ordering Information
Please contact your Lineage Power Sales Representative for pricing, availability and optional features. Table 6. Device Codes
Device Code Input Voltage Range Output Voltage Output Current On/Off Logic Connector Type Comcodes
APTH012A0X3-SRZ APTH012A0X43-SRZ APXH012A0X3-SRZ APXH012A0X43-SRZ Table 7. Coding Scheme
2.4 - 5.5Vdc 2.4 - 5.5Vdc 2.4 - 5.5Vdc 2.4 - 5.5Vdc
0.6 - 3.63Vdc 0.6 - 3.63Vdc 0.6 - 3.63Vdc 0.6 - 3.63Vdc
12A 12A 12A 12A
Negative Positive Negative Positive
SMT SMT SMT SMT
CC109130465 CC109130473 CC109130481 CC109130498
TLynx Sequencing Input voltage Output Output voltage family feature. range current AP T H 012A0 12.0A X
On/Off logic 4
Options -SR
ROHS Compliance Z
T = with Seq. H = 2.4 - 5.5V X = w/o Seq.
X= 4 = positive programmable No entry = output negative
S = Surface Mount Z = ROHS6 R = Tape&Reel
Asia-Pacific Headquarters Tel: +65 6416 4283 Europe, Middle-East and Africa Headquarters Tel: +49 898 780 672 80 India Headquarters Tel: +91 80 28411633
World Wide Headquarters Lineage Power Corporation 3000 Skyline Drive, Mesquite, TX 75149, USA +1-800-526-7819 (Outside U.S.A.: +1-972-284-2626) www.lineagepower.com e-mail: techsupport1@lineagepower.com
Lineage Power reserves the right to m ake changes to t he product(s) or inf ormation contained herein without notice. No liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information. (c) 2008 Lineage Pow er C orporation, (Mesquite, Texas) All I nternational Rights Res erved.
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Document No: DS07-007 ver. 1.11 PDF name: APTH012A0X_ds.pdf

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