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NCP3985 Micropower, 150 mA Low-Noise, High PSRR, Ultra-Low Dropout BiCMOS Voltage Regulator
The NCP3985 is 150 mA LDO that provides the engineer with a very stable, accurate voltage with low noise and high Power Supply Rejection Ratio (PSRR) suitable for sensitive applications. In order to optimize performance for battery operated portable applications, the NCP3985 employs an advanced BiCMOS process to combine the benefits of low noise and superior dynamic performance of bipolar elements with very low ground current consumption at full loads offered by CMOS. The NCP3985 is stable with small, low value capacitors and is available in TSOP-5 package.
Features http://onsemi.com MARKING DIAGRAM
1 TSOP-5 SN SUFFIX CASE 483 5 XXXAYWG G 1 5
* Output Voltage Options: * * * * * * * * * * * * * * *
- 1.8 V, 2.5 V, 2.75 V, 2.8 V, 3.0 V, 3.3 V - Contact Factory for Other Voltage Options Output Current Limit 200 mA Low Noise (typ 20 mVrms) High PSRR (typ 70 dB) Stable with Ceramic Output Capacitors as low as 1 mF Low Sleep Mode Current (max 1 mA) Active Discharge Circuit Current Limit Protection Thermal Shutdown Protection Direct Replacement for LP3985 These are Pb-Free Devices Cellular Telephones Noise Sensitive Applications (Video, Audio) Analog Power Supplies PDAs / Palmtops / Organizers / GPS Battery Supplied Devices
XXX = Specific Device Code A = Assembly Location Y = Year W = Work Week G = Pb-Free Package (Note: Microdot may be in either location)
PIN ASSIGNMENT
Vin GND CE (Top View) Cnoise Vout
ORDERING INFORMATION
See detailed ordering, marking and shipping information in the package dimensions section on page 9 of this data sheet.
Typical Applications
Vin
Vin Cin
Vout NCP3985 CE Cnoise GND
Vout Cnoise
Cout
Figure 1. Typical Application Schematic
(c) Semiconductor Components Industries, LLC, 2008
1
April, 2008 - Rev. 1
Publication Order Number: NCP3985/D
NCP3985
Vin
Vout
Cnoise
CE
Figure 2. Simplified Block Diagram PIN FUNCTION DESCRIPTION
Pin No. 1 2 3 Pin Name Vin GND CE Power Supply Input Voltage Power Supply Ground Chip Enable: This pin allows on/off control of the regulator. To disable the device, connect to GND. If this function is not in use, connect to Vin. Internal 5 MW Pull Down resistor is connected between CE and GND. Noise reduction pin. (Connect 100 nF or 10 nF capacitor to GND) Regulated Output Voltage Description
4 5
Cnoise Vout
MAXIMUM RATINGS
Rating Input Voltage (Note 1) Chip Enable Voltage Noise Reduction Voltage Output Voltage Maximum Junction Temperature (Note 1) Storage Temperature Range Symbol Vin VCE VCnoise Vout TJ(max) TSTG Value -0.3 V to 6 V -0.3 V to Vin +0.3 V -0.3 V to Vin +0.3 V -0.3 V to Vin +0.3 V 150 -55 to 150 Unit V V V V C C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. NOTE: This device series contains ESD protection and exceeds the following tests: Human Body Model 2000 V per MIL-STD-883, Method 3015 Machine Model Method 200 V
THERMAL CHARACTERISTICS
Rating Package Thermal Resistance: (Note 1) Junction-to-Lead (pin 5) Junction-to-Ambient Symbol RJA Value 109 220 Unit C/W
1. Refer to ELECTRICAL CHARACTERISTICS and APPLICATION INFORMATION for Safe Operating Area
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+
-
Bandgap Reference Voltage
Current Limit
Active Discharge
GND
NCP3985
ELECTRICAL CHARACTERISTICS
(Vin = Vout + 0.5 V, VCE = 1.2 V, Cin = 0.1 mF, Cout = 1 mF, Cnoise = 10 nF, TA = -40C to 85C, unless otherwise specified (Note 2)) Characteristic REGULATOR OUTPUT Input Voltage Output Voltage (Note 3) 1.8 V 2.5 V 2.75 V 2.8 V 3.0 V 3.3 V 1.8 V 2.5 V 2.75 V 2.8 V 3.0 V 3.3 V Vin = (Vout + 0.5 V) to 5.5 V Iout = 1 mA Vin Vout 2.5 1.764 2.450 2.695 2.744 2.940 3.234 (-2%) 1.746 2.425 2.6675 2.716 2.910 3.201 (-3%) Regline Regload Vn ILIM ISC VDO 200 210 1.2 2.5 20 25 310 320 105 105 105 100 100 70 110 0.1 150 20 5 0.4 4 800 200 470 490 155 155 155 150 150 90 220 1 0.4 10 mA mA mV -0.2 5.5 1.836 2.550 2.805 2.856 3.060 3.366 (+2%) 1.854 2.575 2.8325 2.884 3.090 3.399 (+3%) 0.2 25 %/V mV mVrms V V Test Conditions Symbol Min Typ Max Unit
Output Voltage (Note 3)
Vin = (Vout + 0.5 V) to 5.5 V Iout = 1 mA to 150 mA
Vout
V
Power Supply Ripple Rejection
Vin = Vout + 0.5 V + 0.5 Vp-p Iout = 1 mA to 150 mA f = 120 Hz Cnoise = 100nF f = 1 kHz f = 10 kHz Vin = (Vout + 0.5 V) to 5.5 V, Iout = 1 mA Iout = 1 mA to 150 mA f = 10 Hz to 100 kHz Iout = 1 mA to 150 mA Cnoise = 100 nF Cnoise = 10 nF Vout = Vout(nom) - 0.1 V Vout = 0 V 2.5 V 2.75 V 2.8 V 3.0 V 3.3 V Iout = 150 mA
PSRR 70 70 55 12
dB
Line Regulation Load Regulation Output Noise Voltage
Output Current Limit Output Short Circuit Current Dropout Voltage (Note 4)
GENERAL Ground Current Disable Current Thermal Shutdown Threshold (Note 5) Thermal Shutdown Hysteresis (Note 5) CHIP ENABLE Input Threshold Low High Vth(CE) RPD(CE) Iout = 150 mA Cnoise = 10 nF/100 nF Cnoise = 10 nF Cnoise = 100 nF Iout = 1 mA Iout = 10 mA ton toff V MW ms ms Iout = 1 mA Iout = 150 mA VCE = 0 V IGND IDIS TSD TSH mA mA C C
Internal Pull-Down Resistance (Note 6) TIMING Turn-on Time Turn-off Time
2. Performance guaranteed over the indicated operating temperature range by design and/or characterization, production tested at TJ = TA = 25C. Low duty cycle pulse techniques are used during testing to maintain the junction temperature as close to ambient as possible. 3. Contact factory for other voltage options. 4. Measured when output voltage falls 100 mV below the regulated voltage at Vin = Vout + 0.5 V if Vout < 2.5 V, then VDO = Vin - Vout at Vin = 2.5 V. 5. Guaranteed by design and characterization. 6. Expected to disable device when CE pin is floating.
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NCP3985
TYPICAL CHARACTERISTICS
1.820 Vout, OUTPUT VOLTAGE (V) Vout, OUTPUT VOLTAGE (V) 1.815 1.810 1.805 1.800 1.795 1.790 1.785 1.780 -40 -20 0 20 40 60 80 100 Iout = 1 mA Iout = 150 mA Vout = 1.8 V 2.520 2.515 2.510 2.505 2.500 2.495 2.490 2.485 2.480 -40 -20 0 20 40 60 80 100 Iout = 150 mA Iout = 1 mA Vout = 2.5 V
TA, AMBIENT TEMPERATURE (C)
TA, AMBIENT TEMPERATURE (C)
Figure 3. Output Voltage vs. Temperature (Vout = 1.8 V)
2.760 Vout, OUTPUT VOLTAGE (V) Vout, OUTPUT VOLTAGE (V) 2.755 2.750 2.745 2.740 2.735 2.730 2.725 2.720 -40 -20 0 20 40 60 80 Iout = 1 mA Iout = 150 mA Vout = 2.75 V 2.820 2.815 2.810 2.805 2.800
Figure 4. Output Voltage vs. Temperature (Vout = 2.5 V)
Vout = 2.8 V
Iout = 1 mA Iout = 150 mA
2.795 2.790 2.785
100
2.780 -40
-20
0
20
40
60
80
100
TA, AMBIENT TEMPERATURE (C)
TA, AMBIENT TEMPERATURE (C)
Figure 5. Output Voltage vs. Temperature (Vout = 2.75 V)
3.020 Vout, OUTPUT VOLTAGE (V) Vout, OUTPUT VOLTAGE (V) 3.015 3.010 3.005 3.000 2.995 2.990 2.985 2.980 -40 -20 0 20 40 60 80 100 Iout = 150 mA Iout = 1 mA Vout = 3.0 V 3.320 3.315 3.310 3.305 3.300 3.295 3.290 3.285 3.280 -40
Figure 6. Output Voltage vs. Temperature (Vout = 2.8 V)
Vout = 3.3 V
Iout = 1 mA Iout = 150 mA
-20
0
20
40
60
80
100
TA, AMBIENT TEMPERATURE (C)
TA, AMBIENT TEMPERATURE (C)
Figure 7. Output Voltage vs. Temperature (Vout = 3.0 V)
Figure 8. Output Voltage vs. Temperature (Vout = 3.3 V)
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NCP3985
TYPICAL CHARACTERISTICS
4.0 Vout, OUTPUT VOLTAGE (V) 3.3 V 3.0 V 2.8 V 2.5 V 1.8 V 1.5 1.0 0.5 0.0 0.0 1.0 2.0 3.0 4.0 TA = 25C Iout = 1 mA 5.0 6.0 IGND, GROUND CURRENT (mA) 3.5 3.0 2.5 2.0 140 130 120 110 100 90 80 70 60 50 40 -40 -20 0 20 40 60 80 100 Iout = 1 mA Iout = 150 mA
Vin, INPUT VOLTAGE (V)
TA, AMBIENT TEMPERATURE (C)
Figure 9. Output Voltage vs. Input Voltage
200 IGND, GROUND CURRENT (mA) Vout = 2.8 V VDO, DROPOUT VOLTAGE (mV) 180 160 140 120 100 80 60 40 20 0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 Vout = 1.8 V Iout = 1 mA Vout = 2.5 V TA = 25C Vout = 3.3 V Vout = 3.0 V Iout = 150 mA 135 130 125 120 115 110 105 100 95 90 85 0
Figure 10. Ground Current vs. Temperature
Vout = 2.5 V
TA = 85C
TA = 25C TA = -40C
25
50
75
100
125
150
Vin, INPUT VOLTAGE (V)
Iout, OUTPUT CURRENT (mA)
Figure 11. Ground Current vs. Input Voltage
125 VDO, DROPOUT VOLTAGE (mV) VDO, DROPOUT VOLTAGE (mV) 120 115 110 105 100 95 90 85 80 75 0 25 50 75 100 125 150 Iout, OUTPUT CURRENT (mA) TA = -40C TA = 25C Vout = 2.8 V TA = 85C 125 120 115 110 105 100 95 90 85 80 75 0
Figure 12. Dropout Voltage vs. Output Current
Vout = 3.0 V
TA = 85C
TA = 25C
TA = -40C
25
50
75
100
125
150
Iout, OUTPUT CURRENT (mA)
Figure 13. Dropout Voltage vs. Output Current
Figure 14. Dropout Voltage vs. Output Current
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NCP3985
TYPICAL CHARACTERISTICS
125 VDO, DROPOUT VOLTAGE (mV) 120 115 110 105 100 95 90 85 80 75 0 25 50 75 100 125 150 Iout, OUTPUT CURRENT (mA) TA = -40C TA = 25C Vout = 3.3 V TA = 85C
Figure 15. Dropout Voltage vs. Output Current
ISC, SHORT CIRCUIT CURRENT LIMIT (mA)
340 ILIM, CURRENT LIMIT (mA) 330 320 310 300 290 280 -40
350 340 330 320 310 300 290 -40
-20
0
20
40
60
80
100
-20
0
20
40
60
80
100
TA, AMBIENT TEMPERATURE (C)
TA, AMBIENT TEMPERATURE (C)
Figure 16. Current Limit vs. Temperature
0 Vn, NOISE DENSITY (nV/Hz) -10 -20 -30 PSRR (dB) -40 -50 -60 -70 -80 -90 -100 10 100 1,000 f, FREQUENCY (Hz) 10,000 100,000 TA = 25C Vout = 2.8 V Iout = 150 mA Cnoise = 10 nF 1800 1600 1400 1200 1000 800 600 400 200 0 10
Figure 17. Short Circuit Current vs. Temperature
TA = 25C Vout = 2.8 V Iout = 150 mA Cnoise = 10 nF
100
1,000 FREQUENCY (Hz)
10,000
100,000
Figure 18. PSRR vs. Frequency
Figure 19. Noise Density vs. Frequency
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NCP3985
TYPICAL CHARACTERISTICS
4.2 V VCE 1 V/div Vin 500 mV/div 3.6 V TA = 25C Vout = 1.8 V Iout = 150 mA Cout = 1 mF Vout 10 mV/div
TA = 25C Vout 1 V/div Vin = 4 V Iout = 150 mA Cnoise = 0 nF
TIME (20 ms/div)
TIME (100 ms/div)
Figure 20. Enable Voltage and Output Voltage vs. Time (Start-Up)
10 ESR of OUTPUT CAPACITOR (W) TA = 25C
Figure 21. Line Transient
Unstable Region Vout = 3.0 V 1 Vout = 1.8 V Stable Region 0.1 Cout = 1 mF to 10 mF 0 25 50 75 100 125 150
Iout 100 mA/div
Vout 50 mV/div Vin = 2.8 V Vout = 1.8 V Cout = 1 mF
0.01 TIME (40 ms/div) Iout, OUTPUT CURRENT (mA)
Figure 22. Load Transient
Figure 23. Output Capacitor ESR vs. Output Current
NOTE: Typical characteristics were measured with the same conditions as electrical characteristics, unless otherwise noted.
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NCP3985
APPLICATION INFORMATION
General
The NCP3985 is a 200 mA (current limited) linear regulator with a logic input for on/off control for the high speed turn-off output voltage. Access to the major contributor of noise within the integrated circuit is provided as the focus for noise reduction within the linear regulator system.
Power Up/Down
Typical characteristics were measured with Murata ceramic capacitors. GRM219R71E105K (1 mF, 25 V, X7R, 0805) and GRM21BR71A106K (10 mF, 10 V, X7R, 0805).
Output Noise
During power up, the NCP3985 maintains a high impedance output (Vout) until sufficient voltage is present on Vin to power the internal bandgap reference voltage. When sufficient voltage is supplied (approx 1.2 V), Vout will start to turn on (assume CE shorted to Vin), linearly increasing until the output regulation voltage has been reached. Active discharge circuitry has been implemented to insure a fast turn off time. Then CE goes low, the active discharge transistor turns on creating a fast discharge of the output voltage. Power to drive this circuitry is drawn from the output node. This is to maintain the lowest quiescent current when in the sleep mode (VCE = 0.4 V). This circuitry subsequently turns off when the output voltage discharges.
CE (chip enable)
The main contributor for noise present on the output pin Vout is the reference voltage node. This is because any noise which is generated at this node will be subsequently amplified through the error amplifier and the PMOS pass device. Access to the reference voltage node is supplied directly through the Cnoise pin. Noise can be reduced from a typical value of 25 mVrms by using 10 nF to 20 mVrms by using a 100 nF from the Cnoise pin to ground. A bypass capacitor is recommended for good noise performance and better load transient response.
Thermal Shutdown
The enable function is controller by the logic pin CE. The voltage threshold of this pin is set between 0.4 V and 1.2 V. A voltage lower than 0.4 V guarantees the device is off. A voltage higher than 1.2 V guarantees the device is on. The NCP3985 enters a sleep mode when in the off state drawing less than 1 mA of quiescent current. The device can be used as a simple regulator without use of the chip enable feature by tying the CE pin to the Vin pin.
Current Limit
When the die temperature exceeds the Thermal Shutdown threshold, a Thermal Shutdown (TSD) event is detected and the output (Vout) is turned off. There is no effect from the active discharge circuitry. The IC will remain in this state until the die temperature moves below the shutdown threshold (150C typical) minus the hysteresis factor (20C typical). This feature provides protection from a catastrophic device failure due to accidental overheating. It is not intended to be used as a substitute for proper heat sinking. The maximum device power dissipation can be calculated by:
PD + TJ * TA R qJA
RqJA, THERMAL RESISTANCE JUNCTION-TO-AMBIENT (C/W)
Output Current is internally limited within the IC to a minimum of 200 mA. The design is set to a higher value to allow for variation in processing and the temperature coefficient of the parameter. The NCP3985 will source this amount of current measured with a voltage 100 mV lower than the typical operating output voltage. The specification for short circuit current limit (@ Vout = 0 V) is specified at 320 mA (typ). There is no additional circuitry to lower the current limit at low output voltages. This number is provided for informational purposes only.
Output Capacitor
Thermal resistance value versus copper area and package is shown in Figure 24.
380 330 280 TSOP-5 (1 oz) 230 180 130 80 0 100 200 300 400 (mm2) 500 600 700 PCB COPPER AREA TSOP-5 (2 oz)
The NCP3985 has been designed to work with low ESR ceramic capacitors. There is no ESR lower limit for stability for the recommended 1 mF output capacitor. Stable region for Output capacitor ESR vs Output Current is shown in Figure 23.
Figure 24. RqJA vs. PCB Copper Area
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NCP3985
ORDERING INFORMATION
Device NCP3985SN18T1G NCP3985SN25T1G NCP3985SN275T1G NCP3985SN28T1G NCP3985SN30T1G NCP3985SN33T1G Nominal Output Voltage 1.8 V 2.5 V 2.75 V 2.8 V 3.0 V 3.3 V Marking LKA LKD LKE LKB LKC LKF TSOP-5 (Pb-Free) 3000 / Tape & Reel Package Shipping
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
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NCP3985
PACKAGE DIMENSIONS
TSOP-5 CASE 483-02 ISSUE H
NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. CONTROLLING DIMENSION: MILLIMETERS. 3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS. MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL. 4. DIMENSIONS A AND B DO NOT INCLUDE MOLD FLASH, PROTRUSIONS, OR GATE BURRS. 5. OPTIONAL CONSTRUCTION: AN ADDITIONAL TRIMMED LEAD IS ALLOWED IN THIS LOCATION. TRIMMED LEAD NOT TO EXTEND MORE THAN 0.2 FROM BODY. DIM A B C D G H J K L M S MILLIMETERS MIN MAX 3.00 BSC 1.50 BSC 0.90 1.10 0.25 0.50 0.95 BSC 0.01 0.10 0.10 0.26 0.20 0.60 1.25 1.55 0_ 10 _ 2.50 3.00
NOTE 5 2X
D 5X 0.20 C A B M
0.10 T 0.20 T L G A
5 1 2 4 3
2X
B
S K
DETAIL Z
DETAIL Z
J C 0.05 H T
SEATING PLANE
SOLDERING FOOTPRINT*
1.9 0.074
0.95 0.037
2.4 0.094 1.0 0.039 0.7 0.028
SCALE 10:1
mm inches
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
The products described herein (NCP3985), may be covered by one or more U.S. patents.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
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NCP3985/D

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