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LTC3525-3/ LTC3525-3.3/LTC3525-5 400mA Micropower Synchronous Step-Up DC/DC Converter with Output Disconnect FEATURES

DESCRIPTIO

Up to 95% Efficiency Output Disconnect and Inrush Current Limit Fixed Output Voltages of 3V, 3.3V or 5V Delivers 65mA at 3V from a 1V Input Delivers 60mA at 3.3V from a 1V Input, or 140mA at 3.3V from a 1.8V Input Delivers 175mA at 5V from a 3V Input Burst Mode(R) Operation: IQ = 7A Only Three External Components VIN > VOUT Operation <1A Shutdown Current Antiringing Control Short-Circuit and Overtemperature Protection Very Low Profile of 1mm Tiny 6-Pin SC70 Package
The LTC(R)3525-3/LTC3525-3.3/LTC3525-5 are high efficiency synchronous step-up DC/DC converters with output disconnect that can start up with an input as low as 1V. They offer a compact, high efficiency alternative to charge pumps in single cell or dual cell alkaline or Li-ion applications. Only three small external components are required. The LTC3525 is offered in fixed output voltages of 3V, 3.3V or 5V. The device includes a 0.5 N-channel MOSFET switch and a 0.8 P-channel synchronous rectifier. Peak switch current ranges from 150mA to 400mA, depending on load, providing enhanced efficiency. Quiescent current is an ultralow 7A, maximizing battery life in portable applications. Other features include <1A shutdown current, antiringing control and thermal shutdown. The LTC3525 is available in a tiny 6-pin SC70 package.
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patents Pending
APPLICATIO S

MP3 Players Portable Instruments Glucose Meters Digital Cameras
TYPICAL APPLICATIO
LTC3525-3.3 Efficiency and Power Loss vs Load Current
L1* 10H 100 90 LTC3525-3.3 VIN 1V to 1.6V OFF ON SHDN GND 1F VOUT GND 10F VIN SW VOUT 3.3V 60mA EFFICIENCY (%) 80 EFFICIENCY 70 60 POWER LOSS 50 40
3525 TA01
30 20 0.01 0.1 1 10 LOAD (mA)
*MURATA LQH32CN100K53
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100 10 POWER LOSS (mW) 1 0.1 VIN = 3V VIN = 2.4V VIN = 1.2V 100 0.01 1000
LT3525 * TA02
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LTC3525-3/ LTC3525-3.3/LTC3525-5 ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW SHDN 1 GND 2 VIN 3 6 SW 5 GND 4 VOUT
VIN, VOUT Voltage ........................................ - 0.3V to 6V SW Voltage ................................................. - 0.3V to 6V SW Voltage < 100ns ................................... -0.3V to 7V SHDN Voltage ............................................. -0.3V to 6V Operating Temperature Range (Notes 2, 5).......................................... -40C to 85C Storage Temperature Range................... -65C to 125C Lead Temperature (Soldering, 10 sec) .................. 300C
SC6 PACKAGE 6-LEAD PLASTIC SC70 TJMAX = 125C JA = 256C/W IN FREE AIR, JA = 150C/W ON BOARD OVER GROUND PLANE
ORDER PART NUMBER LTC3525ESC6-3 LTC3525ESC6-3.3 LTC3525ESC6-5
SC6 PART MARKING LCDR LBTG LBWT
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER Input Start-Up Voltage Output Voltage Quiescent Current, VOUT Quiescent Current, VIN Quiescent Current, VIN - Shutdown NMOS Switch Leakage PMOS Switch Leakage NMOS Switch On Resistance PMOS Switch On Resistance Peak Current Limit SHDN Threshold SHDN Input Current (Note 6)
(LTC3525-3) The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 1.2V, VSHDN = 1.2V, VOUT = 3V unless otherwise noted.
CONDITIONS
MIN 2.91
TYP 0.85 3.00 7 0.5 0.1 0.1 0.1 0.6 0.9
MAX 1 3.09 15 3 1 1 3
UNITS V V A A A A A A
SHDN = VIN (Note 4) SHDN = VIN (Note 4) SHDN = 0V, VOUT = 0V Not Including Switch Leakage VIN = VOUT = VSW = 5V, SHDN = 0V VIN = VSW = 5V, VOUT = 0V, SHDN = 0V (Note 3) (Note 3) 0.4 0.4 VSHDN = VIN or VOUT
0.45 0.6 0.01 1 1
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LTC3525-3/ LTC3525-3.3/LTC3525-5 ELECTRICAL CHARACTERISTICS
PARAMETER Input Start-Up Voltage Output Voltage Quiescent Current, VOUT Quiescent Current, VIN Quiescent Current, VIN - Shutdown NMOS Switch Leakage PMOS Switch Leakage NMOS Switch On Resistance PMOS Switch On Resistance Peak Current Limit SHDN Threshold SHDN Input Current VSHDN = VIN or VOUT (Note 6) SHDN = VIN (Note 4) SHDN = VIN (Note 4) SHDN = 0V, VOUT = 0V Not Including Switch Leakage VIN = VOUT = VSW = 5V, SHDN = 0V VIN = VSW = 5V, VOUT = 0V, SHDN = 0V (Note 3) (Note 3) 0.4 0.4
(LTC3525-3.3) The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 1.2V, VSHDN = 1.2V, VOUT = 3.3V unless otherwise noted.
CONDITIONS MIN 3.20 TYP 0.85 3.30 7 0.5 0.1 0.1 0.1 0.5 0.8 0.45 0.6 0.01 1 1 MAX 1 3.40 15 3 1 1 3 UNITS V V A A A A A A V A
(LTC3525-5) The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 2.4V, VSHDN = 2.4V, VOUT = 5V unless otherwise noted.
PARAMETER Input Start-Up Voltage Output Voltage Quiescent Current, VOUT Quiescent Current, VIN Quiescent Current, VIN - Shutdown NMOS Switch Leakage PMOS Switch Leakage NMOS Switch On Resistance PMOS Switch On Resistance Peak Current Limit SHDN Threshold SHDN Input Current VSHDN = VIN or VOUT (Note 6) SHDN = VIN (Note 4) SHDN = VIN (Note 4) SHDN = 0V, VOUT = 0V Not Including Switch Leakage VIN = VOUT = VSW = 5V, SHDN = 0V VIN = VSW = 5V, VOUT = 0V, SHDN = 0V (Note 3) (Note 3) 0.4 0.4
CONDITIONS
MIN 4.85
TYP 0.85 5.00 8 1.5 0.1 0.1 0.1 0.4 0.7 0.5 0.6 0.01
MAX 1 5.15 18 5 1 1 3
UNITS V V A A A A A A
1 1
V A
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC3525E is guaranteed to meet performance specifications from 0C to 85C. Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: Specification is guaranteed by design and not 100% tested in production.
Note 4: Current Measurements are performed when the LTC3525 is not switching. Note 5: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Note 6: Consult LTC Marketing for other output voltage options.
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LTC3525-3/ LTC3525-3.3/LTC3525-5 TYPICAL PERFOR A CE CHARACTERISTICS TA = 25C unless otherwise noted.
Maximum Output Current vs VIN (for VOUT to Drop 2.5%)
300 250 200 IOUT (mA) 150 100 50 0 0.5 50 LTC3525-3 LTC3525-3.3 IIN (A) LTC3525-5 LOAD (mA) 150 LTC3525-3.3 250 LTC3525-5 200
1.0
1.5
2.0
2.5 3.0 VIN (V)
3.5
LTC3525-3 Efficiency and Power Loss vs Load
100 90 80 EFFICIENCY (%) EFFICIENCY 70 60 POWER LOSS 50 40 30 20 0.01 0.1 1 10 LOAD (mA) VIN = 2.4V VIN = 1.2V 100 0.1 1 10 POWER LOSS (mW) EFFICIENCY (%) 100 100 90 80
70 60 POWER LOSS 50 40 30 20 0.01 0.1 1 10 LOAD (mA) VIN = 3V VIN = 2.4V VIN = 1.2V 100 0.1 1
EFFICIENCY (%)
LTC3525-3.3 Load Regulation
2.5 2.0 1.5 CHANGE IN VOUT (%) CHANGE IN VOUT (%) 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 0 10 20 30 40 50 LOAD (mA) 60 70 80 COUT = 10F COUT = 22F VIN = 1.2V 2.5 2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5
CHANGE IN VOUT (%)
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4.0
3525 G01
3525 G24
Maximum Startup Load vs VIN (Resistive Load)
50 45 40 35 30 25 20 15 10 5 0 4.5 0.5 1.0 1.5 2.0 VIN (V) 2.5 3.0
3525 G02
No-Load Input Current vs VIN
LTC3525-5
100
LTC3525-3
LTC3525-3.3
0 1.0
1.5
2.0
2.5 3.0 VIN (V)
3.5
4.0
4.5
3525 G03
LTC3525-3.3 Efficiency and Power Loss vs Load
100 100 90 10 POWER LOSS (mW) EFFICIENCY 80 70 60 50 40 30 20 10
LTC3525-5 Efficiency and Power Loss vs Load
1000
100 EFFICIENCY 10 POWER LOSS POWER LOSS (mW)
1
0.01 1000
0.01 1000
0 0.01
0.1
1 10 LOAD (mA)
VIN = 3.6V 0.1 VIN = 2.4V VIN = 1.2V 0.01 100 1000
3525 G05
3525 G04
LTC3525-3.3 Load Regulation
VIN = 2.4V 2.5 2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 0 20 40 60 80 100 120 140 160 180 LOAD (mA)
3525 G07
LTC3525-5 Load Regulation
VIN = 1.2V
COUT = 22F
COUT = 22F COUT = 10F
COUT = 10F
-2.5
0
10
20
30 40 LOAD (mA)
50
60
3525 G08
3525 G06
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LTC3525-3/ LTC3525-3.3/LTC3525-5 TYPICAL PERFOR A CE CHARACTERISTICS TA = 25C unless otherwise noted.
LTC3525-5 Load Regulation
2.5 2.0 1.5 CHANGE IN VOUT (%) CHANGE IN VOUT (%) 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 0 20 40 60 80 100 LOAD (mA) 120 140 COUT = 10F COUT = 22F VIN = 2.4V 2.5 2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 0 50 100 LOAD (mA) 150 200
3525 G10
FREQUENCY (kHz)
Light Load Burst Frequency vs Load
40 35 BURST FREQUENCY (kHz) CHANGE IN VOUT (%) 30 25 20 COUT = 10F 15 10 COUT = 22F 5 0 0.1 1 LOAD (mA) 10
3525 G12
SWITCHING DELAY (s)
LTC3525-3.3 Input Current and VOUT at Startup
VIN = 1.2V IOUT = 5mA VOUT 1V/DIV INPUT CURRENT 100mA/DIV 500s/DIV
3525 G15
UW
3525 G09
LTC3525-5 Load Regulation
VIN = 3.6V 1200 1100
Switching Frequency vs VIN
L = 10H LTC3525-5 1000 900 800 700 600 500 400 300 1.0 1.5 2.0 2.5 3.0 VIN (V) 3.5 4.0 4.5 LTC3525-3.3
COUT = 22F COUT = 10F
3525 G11
VOUT Variation vs Temperature (Normalized to 25C)
0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -40-30-20-10 0 10 20 30 40 50 60 70 80 TEMPERATURE (C)
3525 G13
Startup Delay Coming Out of Shutdown
120 100 80 60 40 20 0 1.0 1.5 2.0 2.5 3.0 VIN (V) 3.5 4.0 4.5
3525 G14
LTC3525-3.3 Output Voltage Ripple
IOUT = 40mA IOUT = 80mA 50s/DIV
3525 G16
50mV/DIV
VIN = 1.2V COUT = 10F
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LTC3525-3/ LTC3525-3.3/LTC3525-5 TYPICAL PERFOR A CE CHARACTERISTICS TA = 25C unless otherwise noted.
LTC3525-3.3 Output Voltage Ripple
IOUT = 5mA IOUT = 40mA IOUT = 80mA 50s/DIV
3525 G17
VIN = 1.2V COUT = 22F
LTC3525-5 Output Voltage Ripple
IOUT = 5mA IOUT = 50mA IOUT = 150mA 50s/DIV
3525 G19
VIN = 2.4V COUT = 22F
LTC3525-3.3 50mA Load Step Response
OUTPUT RIPPLE 50mV/DIV LOAD CURRENT 20mA/DIV 500s/DIV
3525 G21
VIN = 1.2V COUT = 22F
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LTC3525-3.3 Output Voltage Ripple
IOUT = 5mA 50mV/DIV IOUT = 100mA IOUT = 190mA 50mV/DIV
VIN = 2.4V COUT = 22F
50s/DIV
3525 G18
LTC3525-5 Output Voltage Ripple
IOUT = 20mA IOUT = 100mA IOUT = 200mA 50s/DIV
3525 G20
50mV/DIV
50mV/DIV
VIN = 3.6V COUT = 22F
LTC3525-3.3 100mA Load Step Response
OUTPUT RIPPLE 50mV/DIV
LTC3525-5 100mA Load Step Response
OUTPUT RIPPLE 50mV/DIV LOAD CURRENT 50mA/DIV 500s/DIV
3525 G22
LOAD CURRENT 50mA/DIV 500s/DIV
3525 G23
VIN = 2.4V COUT = 22F
VIN = 3.6V COUT = 22F
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LTC3525-3/ LTC3525-3.3/LTC3525-5 PI FU CTIO S
SHDN (Pin 1): Logic Controlled Shutdown Input. Con nect to a voltage >1V to enable the LTC3525. Connect to a voltage <0.4V to disable the LTC3525. GND (Pins 2, 5): Ground. VIN (Pin 3): Input Voltage. The LTC3525 is powered from VIN until VOUT exceeds VIN. Once VOUT is greater than (VIN + 0.2V typical), it is powered from VOUT. Place a ceramic bypass capacitor from VIN to GND. A minimum value of 1F is recommended. VOUT (Pin 4): Output Voltage Sense and the Output of the Synchronous Rectifier. Connect the output filter capacitor from VOUT to GND, close to the IC. A minimum value of 10F ceramic is recommended. Use 22F for reduced output ripple. The output disconnect feature disconnects VOUT from VIN when SHDN is <0.4V. SW (Pin 6): Switch Pin. Connect an inductor from this pin to VIN. An internal antiringing resistor is connected across SW and VIN after the inductor current has dropped to zero to minimize EMI.
BLOCK DIAGRA
VOUT VSEL VBEST VB 4 VOUT SHUTDOWN SHUTDOWN GATE DRIVERS AND ANTI-CROSS CONDUCTION OFFSET VREF UVLO VREF UVLO - IPK WELL SWITCH
SHDN 1
IPK COMPARATOR STARTUP LOGIC - IVAL SHUTDOWN TSD WAKE +
INTEGRATOR ADJUST 5 GND 2 GND
SLEEP COMPARATOR
+
THERMAL SHUTDOWN
-
+
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SW 6
VIN 3
+ -
ADJUST
+
OFFSET
-
ADJUST
IVALLEY COMPARATOR
FB VREF
3525 BD
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LTC3525-3/ LTC3525-3.3/LTC3525-5 OPERATIO
The LTC3525 is a high performance Burst Mode operation only, synchronous boost converter requiring only three small external components. Its simplicity and small size make it a high efficiency alternative to charge pump designs. It is designed to start up from a single alkaline or nickel cell, with input voltages as low as 1V, or from two or three cells (or a Li-ion battery), with voltages as high as 4.5V. Once started, VIN can be as low as 0.5V (depending on load current) and maintain regulation. The output voltage is preset internally to either 3V, 3.3V or 5V. Peak switch current is 400mA minimum, providing regulation with load currents up to 150mA, depending on input voltage. Synchronous rectification provides high efficiency operation while eliminating the need for an external Schottky diode. True output disconnect eliminates inrush current at start-up, and allows VOUT to be disconnected from VIN, for zero shutdown current. The output disconnect feature also allows the LTC3525 to maintain regulation with an input voltage equal to or greater than VOUT. Note, however, that the synchronous rectifier is not enabled in this mode resulting in lower efficiency and reduced output current capability. The operating quiescent current is only 7A typical, allowing the converter to maintain high efficiency at extremely light loads. Shutdown The LTC3525 is shut down by pulling SHDN below 0.4V, and made active by raising it above 1V. Note that SHDN can be driven as high as 6V, however, if it is more than 0.9V above the higher of VIN or VOUT, the SHDN input current will increase from zero to 1.5A. After the SHDN pin rises, there is a short delay before switching starts. The delay is 20s to 120s, depending on input voltage (see Typical Performance Characteristics curve).
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Start-up A start-up oscillator allows the LTC3525 to start with input voltages as low as 1V. It remains in start-up mode until two conditions are met. VOUT must exceed VIN by at least 0.2V typical and either VIN or VOUT must be greater than 1.8V typical. During startup, the synchronous rectifier is not enabled, and the internal P-channel synchronous rectifier acts as a follower, causing the peak voltage on SW to reach (VIN + 1V) typical. This limits inrush current by maintaining control of the inductor current when VOUT is less than VIN. To reduce power dissipation in the P-channel synchronous rectifier when the output is shorted, a foldback feature is incorporated that reduces the peak inductor current when VIN is more than 1.7V greater than VOUT. Normal Operation Once VOUT has increased more than 0.2V typical above VIN, and either voltage is above 1.8V, normal operation begins, with synchronous rectification enabled. In this mode, the internal N-channel MOSFET connected between SW and GND stays on until the inductor current reaches a maximum peak value, after which it is turned off and the P-channel synchronous rectifier is turned on. It stays on, delivering current to the output, until the inductor current has dropped below a minimum value at which point it turns off and the cycle repeats. When the output voltage reaches its regulated value both switches are turned off and the LTC3525 goes to sleep, during which time the output capacitor supplies current to the load. Once the output voltage drops approximately 9mV below the regulation value the IC leaves sleep mode and switching is resumed. The LTC3525 has been designed for low output voltage ripple. The output voltage ripple is typically only 20mV peak-to-peak at light load and 60mV peak-to-peak at
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LTC3525-3/ LTC3525-3.3/LTC3525-5 OPERATIO U
INDUCTOR CURRENT 100mA/DIV LOAD CURRENT 50mA/DIV 10s/DIV
3525 F01
Figure 1. Inductor Current Changing as a Function of Load
full load using the minimum recommended 10F output capacitor for the LTC3525-3.3 and a 22F capacitor for the LTC3525-5 (due to the capacitor's DC bias effect). An antiring circuit damps any oscillation at the switch node when the inductor current falls to zero. Power Adjust Feature The LTC3525 incorporates a feature that maximizes efficiency at light load while providing increased power capability at heavy load by adjusting the peak and valley of the inductor current as a function of load. Lowering the peak inductor current to 150mA at light load optimizes efficiency by reducing conduction losses in the internal MOSFET switches. As the load increases, the peak inductor current is automatically increased to a maximum of 400mA. At intermediate loads, the peak inductor current may vary from 150mA to 400mA. Figure 1 shows an example of how the inductor current changes as the load increases. Please note that output capacitor values greater than 47F will result in higher peak currents than necessary at light load. This will lower the light load efficiency.
The valley of the inductor current is automatically adjusted as well, to maintain a relatively constant inductor ripple current. This keeps the switching frequency relatively constant. The maximum average load current that can be supported is given by: IO(MAX) = 0.3 * VIN * Amps VO
Where is the efficiency (see Typical Performance Characteristics). The "burst" frequency (how often the LTC3525 delivers a burst of current pulses to the load) is determined by the internal hysteresis (output voltage ripple), the load current and the amount of output capacitance. All Burst Mode operation or hysteretic converters will enter the audible frequency range when the load is light enough. However, due to the low peak inductor current at light load, circuits using the LTC3525 do not typically generate any audible noise.
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LTC3525-3/ LTC3525-3.3/LTC3525-5 OPERATIO
Component Selection Inductor values between 4.7H and 15H are recommended. In most applications 10H will yield the best compromise between size and efficiency. The inductor should be a low-loss ferrite design and must be rated for peak currents of at least 400mA without saturating. Inductors with lower DC resistance will improve efficiency. Note that the inductor value does not have a significant effect on ripple current, so while lower values will increase the operating frequency, they do not reduce output voltage ripple. Some recommended inductor examples are Murata LQH32C and Coilcraft LPO4812, LPO3310, DO3314, DS1608 and MSS4020.
Table 1. Inductor Vendor Information
SUPPLIER Murata Coilcraft Sumida PHONE USA: (814) 237-1431 (847) 639-6400 USA: (847) 956-0666 FAX USA: (814) 238-0490 (847) 639-1469 USA: (847) 956-0702 WEBSITE www.murata.com www.coilcraft.com www.sumida.com
Table 2. Capacitor Vendor Information
SUPPLIER Murata Taiyo Yuden TDK AVX PHONE USA: (814) 237-1431 (408) 573-4150 (847) 803-6100 (803) 448-9411 FAX USA: (814) 238-0490 (408) 573-4159 (847) 803-6296 (803) 448-1943 WEBSITE www.murata.com www.t-yuden.com www.component.tdk.com www.avxcorp.com
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A ceramic input bypass capacitor should be located as close as possible to the VIN and GND pins of the IC. A minimum value of 1F is recommended. If the battery is more than a few inches away, a bulk tantalum decoupling cap of at least 10F is recommended on VIN. The output capacitor should also be a ceramic, located close to the VOUT and GND pins. A minimum value of 10F is recommended. Increasing the value of the output capacitor to 22F will result in lower output ripple. Higher capacitor values will only offer a small reduction in output ripple, while reducing light load efficiency by causing the peak inductor current to increase above its minimum value of 150mA. The input and output capacitors should be X5R or X7R types, not Y5V.
SHDN SHDN SW LTC3525 GND VIN GND VIN VOUT
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VOUT
Figure 2. Recommended Component Placement
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LTC3525-3/ LTC3525-3.3/LTC3525-5 TYPICAL APPLICATIO S
Single Cell to 3V Converter Using 1mm High Monolithic Inductor
6.8H*
1V to 1.6V
3 1 2 1F
LTC3525-3 VIN SHDN GND SW VOUT GND
*FDK MIP3226D6R8M
2-Alkaline or NiMH to 3.3V
10H*
1.8V to 3.2V
3 1 2 1F
LTC3525-3.3 VIN SHDN GND SW VOUT GND
*MURATA LQH32CN1002K53
PACKAGE DESCRIPTIO
0.10 - 0.40 0.47 MAX 0.65 REF
1.16 REF 0.10 - 0.30 0.10 - 0.18 (NOTE 3) 3.26 MAX 2.1 REF 0.96 MIN 0.80 - 1.00 0.00 - 0.10 REF 1.00 MAX PIN 1 1.80 - 2.40 1.15 - 1.35 (NOTE 4) INDEX AREA (NOTE 6)
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. DETAILS OF THE PIN 1 INDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE INDEX AREA 7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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Single Alkaline or NiMH to 3.3V Converter with 1mm Profile
6.8H*
6 4 5 VOUT 3V 65mA 10F 4V
3525 TA03
1V to 1.6V
3 1 2 1F
LTC3525-3.3 VIN SHDN GND SW VOUT GND
6 4 5 VOUT 3.3V 60mA 10F** 6.3V
3525 TA04
*COILCRAFT LPO3310-682MXD **MURATA GRM219R60J106KE191D
Li-Ion to 5V
10H*
6 4 5 VOUT 3.3V 140mA 10F
3V to 4.2V
3 OFF ON 1 2 1F
LTC3525-5 VIN SHDN GND SW VOUT GND
6 4 5 VOUT 5V 175mA 10F
Li-ion
3525 TA05
3525 TA06
*COILCRAFT MSS4020-103MXD
SC6 Package 6-Lead Plastic SC70
(Reference LTC DWG # 05-08-1638)
1.80 - 2.20 (NOTE 4)
0.65 BSC
0.15 - 0.30 6 PLCS (NOTE 3)
SC6 SC70 0802
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LTC3525-3/ LTC3525-3.3/LTC3525-5 TYPICAL APPLICATIO U
3.3V TO 5V Converter with 1.4mm Profile
10H* 3 1 2 1F LTC3525-5 VIN SHDN GND SW VOUT GND 6 4 5 VOUT 5V 200mA 22F** 6.3V
3525 TA07
3.3V
*COILCRAFT DO3314-103MXD **MURATA GRM21BR60J226ME39L
RELATED PARTS
PART NUMBER LT(R)1615/LT1615-1 LTC1751-3.3/ LTC1751-5 LT1930/LTC1930A LTC3200-5 LTC3400/LTC3400B LTC3401 LTC3402 LTC3421 LTC3425 LTC3429/LTC3429B LTC3458 LTC3458L LTC3459 LT3464 DESCRIPTION 300mA/80mA (ISW), High Efficiency Step-Up DC/DC Converter 100mA, 800kHz, Micropower, Regulated Charge Pump DC/DC Converters 1A (ISW), 1.2MHz/2MHz, High Efficiency Step-Up DC/DC Converter 100mA, 2MHz, Regulated 5V Charge Pump 600mA (ISW), 1.2MHz, Synchronous Step-Up DC/DC Converter 1A (ISW), 3MHz, Synchronous Step-Up DC/DC Converter 2A (ISW), 3MHz, Synchronous Step-Up DC/DC Converter 3A (ISW), 3MHz, Synchronous Step-Up DC/DC Converter with Output Disconnect 5A (ISW), 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter with Output Disconnect 600mA, 500kHz Single/Dual Cell Micropower Synchronous Boost Converter with Output Disconnect 1.4A (ISW), 1.5MHz, Synchronous Step-Up DC/DC Converter with Output Disconnect 1.7A (ISW), 1.5MHz, Synchronous Step-Up DC/DC Converter with Output Disconnect 60mA, 10V Micro Power Synchronous Boost Converter 85mA (ISW), High Efficiency Step-Up DC/DC Converter with Integrated Schottky and PNP Disconnect COMMENTS VIN: 1V to 15V, VOUT(MAX) = 34V, IQ = 20A, ISD <1A, ThinSOTTM Package VIN: 2.5V to 5.5V, VOUT(MAX) = 3.3V/5V, IQ = 20A, ISD <1A, MS8 Package High Efficiency, VIN: 2.6V to 16V, VOUT(MAX) = 34V, IQ = 4.2mA/5.5mA, ISD <1A, ThinSOT Package VIN: 2.7V to 4.5V, VOUT(MAX) = 5V, IQ = 2mA, ISD <1A, ThinSOT Package 92% Efficiency, VIN: 0.5V to 5V, VOUT(MAX) = 5V, IQ = 19A/300A, ISD <1A, ThinSOT Package 97% Efficiency, VIN: 0.5V to 5V, VOUT(MAX) = 5.5V, IQ = 38A, ISD <1A, MS Package 97% Efficiency, VIN: 0.5V to 5V, VOUT(MAX) = 5.5V, IQ = 38A, ISD <1A, MS Package 95% Efficiency, VIN: 0.5V to 4.5V, VOUT(MAX) = 5.25V, IQ = 12A, ISD <1A, QFN-24 Package 95% Efficiency, VIN: 0.5V to 4.5V, VOUT(MAX) = 5.25V, IQ = 12A, ISD <1A, QFN-32 Package 95% Efficiency, VIN: 1V to 4.5V, VOUT(MAX) = 5V, IQ = 20A, ISD <1A, SC70 Package VIN: 1.5V to 6V, VOUT(MAX) = 7.5V, ISD <1A, 3mm x 4mm DFN Package VIN: 1.5V to 6V, VOUT(MAX) = 6V, ISD <1A, 3mm x 4mm DFN Package 95% Efficiency, VIN: 1.5V to 6V, VOUT(MAX) = 10V, IQ =10A, ISD <1A, ThinSOT Package VIN: 2.3V to 10V, VOUT(MAX) = 34V, IQ = 25A, ISD <1A, ThinSOT Package
ThinSOT is a trademark of Linear Technology Corporation.
3525fa
12 Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
LT 0306 REV A * PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2005

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