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 •Output Voltage Options: http://onsemi.com MARKING DIAGRAM 5 1 5 TSOP-5 SN SUFFIX CASE 483 XXXAYWG G 1 XXX = Specific Device Code A = Assembly Location Y = Year W = Work Week G = Pb-Free Package (Note: Microdot may be in either location) - 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 PIN ASSIGNMENT Vout Vin GND Cnoise CE (Top View) ORDERING INFORMATION See detailed ordering, marking and shipping information in the package dimensions section on page 9 of this data sheet. Typical Applications •Cellular Telephones •Noise Sensitive Applications (Video, Audio) •Analog Power Supplies •PDAs / Palmtops / Organizers / GPS •Battery Supplied Devices Vout NCP3985 CE Cnoise GND Vin Vout Vin Cin Cnoise Cout Figure 1. Typical Application Schematic © Semiconductor Components Industries, LLC, 2008 April, 2008 - Rev. 1 1 Publication Order Number: NCP3985/D NCP3985 Vin Vout - Current Limit + Bandgap Reference Voltage Cnoise CE Active Discharge GND Figure 2. Simplified Block Diagram PIN FUNCTION DESCRIPTION Pin No. Pin Name 1 Vin 2 GND 3 CE 4 Cnoise 5 Vout Description 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 MAXIMUM RATINGS Symbol Value Unit Input Voltage (Note 1) Rating Vin -0.3 V to 6 V V Chip Enable Voltage VCE -0.3 V to Vin +0.3 V V VCnoise -0.3 V to Vin +0.3 V V Vout -0.3 V to Vin +0.3 V V TJ(max) 150 °C TSTG -55 to 150 °C Noise Reduction Voltage Output Voltage Maximum Junction Temperature (Note 1) Storage Temperature Range 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 Symbol Package Thermal Resistance: (Note 1) Junction-to-Lead (pin 5) Junction-to-Ambient RθJA 1. Refer to ELECTRICAL CHARACTERISTICS and APPLICATION INFORMATION for Safe Operating Area http://onsemi.com 2 Value Unit °C/W 109 220 NCP3985 ELECTRICAL CHARACTERISTICS (Vin = Vout + 0.5 V, VCE = 1.2 V, Cin = 0.1 mF, Cout = 1 mF, Cnoise = 10 nF, TA = -40°C to 85°C, unless otherwise specified (Note 2)) Test Conditions Characteristic Symbol Min Typ Max Unit Vin 2.5 - 5.5 V 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 Vin = (Vout + 0.5 V) to 5.5 V Iout = 1 mA Vout 1.764 2.450 2.695 2.744 2.940 3.234 (-2%) - 1.836 2.550 2.805 2.856 3.060 3.366 (+2%) V Output Voltage (Note 3) 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 to 150 mA Vout 1.746 2.425 2.6675 2.716 2.910 3.201 (-3%) - 1.854 2.575 2.8325 2.884 3.090 3.399 (+3%) V - 70 70 55 - 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 PSRR dB Line Regulation Vin = (Vout + 0.5 V) to 5.5 V, Iout = 1 mA Regline -0.2 - 0.2 Load Regulation Iout = 1 mA to 150 mA Regload - 12 25 Output Noise Voltage f = 10 Hz to 100 kHz Iout = 1 mA to 150 mA Cnoise = 100 nF Cnoise = 10 nF Vn Vout = Vout(nom) – 0.1 V %/V mV mVrms - 20 25 - ILIM 200 310 470 mA Vout = 0 V ISC 210 320 490 mA Iout = 150 mA VDO - 105 105 105 100 100 155 155 155 150 150 mV Ground Current Iout = 1 mA Iout = 150 mA IGND - 70 110 90 220 mA Disable Current VCE = 0 V IDIS - 0.1 1 mA Thermal Shutdown Threshold (Note 5) TSD - 150 - °C Thermal Shutdown Hysteresis (Note 5) TSH - 20 - °C Vth(CE) 1.2 - 0.4 - V RPD(CE) 2.5 5 10 MW Cnoise = 10 nF Cnoise = 100 nF ton - 0.4 4 - ms Iout = 1 mA Iout = 10 mA toff - 800 200 - ms Output Current Limit Output Short Circuit Current Dropout Voltage (Note 4) 2.5 V 2.75 V 2.8 V 3.0 V 3.3 V GENERAL CHIP ENABLE Input Threshold Low High Internal Pull-Down Resistance (Note 6) TIMING Turn-on Time Iout = 150 mA Turn-off Time Cnoise = 10 nF/100 nF 2. Performance guaranteed over the indicated operating temperature range by design and/or characterization, production tested at TJ = TA = 25°C. 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. http://onsemi.com 3 NCP3985 TYPICAL CHARACTERISTICS 2.520 1.815 2.515 Vout = 1.8 V 1.810 1.805 Iout = 1 mA 1.800 Iout = 150 mA 1.795 1.790 Vout, OUTPUT VOLTAGE (V) Vout, OUTPUT VOLTAGE (V) 1.820 1.785 1.780 -40 -20 0 20 40 60 80 100 Iout = 150 mA 2.495 2.490 2.485 2.480 -40 -20 0 20 40 60 80 Figure 3. Output Voltage vs. Temperature (Vout = 1.8 V) Figure 4. Output Voltage vs. Temperature (Vout = 2.5 V) Vout = 2.75 V Vout, OUTPUT VOLTAGE (V) Vout, OUTPUT VOLTAGE (V) Iout = 1 mA 2.500 100 2.820 2.745 Iout = 1 mA 2.740 Iout = 150 mA 2.735 2.730 2.725 2.815 Vout = 2.8 V 2.810 2.805 Iout = 1 mA 2.800 Iout = 150 mA 2.795 2.790 2.785 2.720 -40 -20 0 20 40 60 80 100 2.780 -40 -20 0 20 40 60 80 TA, AMBIENT TEMPERATURE (°C) TA, AMBIENT TEMPERATURE (°C) Figure 5. Output Voltage vs. Temperature (Vout = 2.75 V) Figure 6. Output Voltage vs. Temperature (Vout = 2.8 V) 100 3.320 3.020 Vout = 3.0 V 3.010 3.005 Iout = 1 mA 3.000 Iout = 150 mA 2.995 2.990 Vout, OUTPUT VOLTAGE (V) Vout, OUTPUT VOLTAGE (V) 2.505 TA, AMBIENT TEMPERATURE (°C) 2.750 3.015 2.510 TA, AMBIENT TEMPERATURE (°C) 2.760 2.755 Vout = 2.5 V 2.985 2.980 -40 -20 0 20 40 60 80 3.315 Vout = 3.3 V 3.310 3.305 Iout = 150 mA 3.295 3.290 3.285 3.280 -40 100 Iout = 1 mA 3.300 -20 0 20 40 60 80 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) http://onsemi.com 4 100 NCP3985 TYPICAL CHARACTERISTICS 140 3.5 IGND, GROUND CURRENT (mA) Vout, OUTPUT VOLTAGE (V) 4.0 3.3 V 3.0 V 2.8 V 2.5 V 3.0 2.5 2.0 1.8 V 1.5 1.0 TA = 25°C Iout = 1 mA 0.5 0.0 0.0 1.0 2.0 3.0 4.0 5.0 100 90 80 Iout = 1 mA 70 60 50 -20 0 20 40 60 80 Vin, INPUT VOLTAGE (V) TA, AMBIENT TEMPERATURE (°C) Figure 9. Output Voltage vs. Input Voltage Figure 10. Ground Current vs. Temperature 100 135 TA = 25°C 180 Vout = 3.3 V Vout = 2.8 V 160 Vout = 3.0 V Vout = 2.5 V 140 VDO, DROPOUT VOLTAGE (mV) IGND, GROUND CURRENT (mA) Iout = 150 mA 110 40 -40 6.0 200 Iout = 150 mA 120 100 Vout = 1.8 V 80 Iout = 1 mA 60 40 20 0 0.0 1.0 2.0 3.0 4.0 5.0 130 Vout = 2.5 V 125 120 TA = 85°C 115 110 105 TA = 25°C 100 95 TA = -40°C 90 85 0 6.0 25 50 75 100 125 150 Vin, INPUT VOLTAGE (V) Iout, OUTPUT CURRENT (mA) Figure 11. Ground Current vs. Input Voltage Figure 12. Dropout Voltage vs. Output Current 125 125 Vout = 2.8 V 120 TA = 85°C VDO, DROPOUT VOLTAGE (mV) VDO, DROPOUT VOLTAGE (mV) 130 120 115 110 TA = 25°C 105 100 95 TA = -40°C 90 85 80 75 0 25 50 75 100 125 150 120 Vout = 3.0 V TA = 85°C 115 110 105 TA = 25°C 100 95 TA = -40°C 90 85 80 75 0 25 50 75 100 125 150 Iout, OUTPUT CURRENT (mA) Iout, OUTPUT CURRENT (mA) Figure 13. Dropout Voltage vs. Output Current Figure 14. Dropout Voltage vs. Output Current http://onsemi.com 5 NCP3985 TYPICAL CHARACTERISTICS VDO, DROPOUT VOLTAGE (mV) 125 Vout = 3.3 V 120 TA = 85°C 115 110 105 TA = 25°C 100 95 TA = -40°C 90 85 80 75 0 25 50 75 100 125 150 Iout, OUTPUT CURRENT (mA) ISC, SHORT CIRCUIT CURRENT LIMIT (mA) Figure 15. Dropout Voltage vs. Output Current ILIM, CURRENT LIMIT (mA) 340 330 320 310 300 290 280 -40 -20 0 20 40 60 80 100 330 320 310 300 290 -40 -20 0 20 40 60 80 TA, AMBIENT TEMPERATURE (°C) Figure 16. Current Limit vs. Temperature Figure 17. Short Circuit Current vs. Temperature 100 1800 -20 -30 Vn, NOISE DENSITY (nV/√Hz) TA = 25°C Vout = 2.8 V Iout = 150 mA Cnoise = 10 nF -10 PSRR (dB) 340 TA, AMBIENT TEMPERATURE (°C) 0 -40 -50 -60 -70 -80 -90 -100 10 350 100 1,000 10,000 100,000 TA = 25°C Vout = 2.8 V Iout = 150 mA Cnoise = 10 nF 1600 1400 1200 1000 800 600 400 200 0 10 100 1,000 10,000 100,000 f, FREQUENCY (Hz) FREQUENCY (Hz) Figure 18. PSRR vs. Frequency Figure 19. Noise Density vs. Frequency http://onsemi.com 6 NCP3985 TYPICAL CHARACTERISTICS 4.2 V VCE 1 V/div 3.6 V Vin 500 mV/div TA = 25°C Vout = 1.8 V Iout = 150 mA Cout = 1 mF TA = 25°C Vout 1 V/div Vin = 4 V Iout = 150 mA Cnoise = 0 nF Vout 10 mV/div TIME (20 ms/div) TIME (100 ms/div) Figure 20. Enable Voltage and Output Voltage vs. Time (Start-Up) Figure 21. Line Transient Iout 100 mA/div Vout 50 mV/div Vin = 2.8 V Vout = 1.8 V Cout = 1 mF ESR of OUTPUT CAPACITOR (W) 10 TA = 25°C Unstable Region Vout = 3.0 V 1 Vout = 1.8 V Stable Region 0.1 Cout = 1 mF to 10 mF 0.01 0 25 50 75 100 125 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. http://onsemi.com 7 150 NCP3985 APPLICATION INFORMATION General Typical characteristics were measured with Murata ceramic capacitors. GRM219R71E105K (1 mF, 25 V, X7R, 0805) and GRM21BR71A106K (10 mF, 10 V, X7R, 0805). 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. Output Noise 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. Power Up/Down 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. Thermal Shutdown 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 (150°C typical) minus the hysteresis factor (20°C 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: CE (chip enable) The enable function is controller by the logic pin CE. The voltage threshold of this pin is set between 0.4 V and 1.2V. 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. PD + TJ * TA R qJA Thermal resistance value versus copper area and package is shown in Figure 24. Current Limit 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 = 0V) 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. RqJA, THERMAL RESISTANCE JUNCTION-TO-AMBIENT (°C/W) 380 Output Capacitor 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 Figure23. 330 280 TSOP-5 (1 oz) 230 TSOP-5 (2 oz) 180 130 80 0 100 200 300 400 PCB COPPER AREA 500 (mm2) Figure 24. RqJA vs. PCB Copper Area http://onsemi.com 8 600 700 NCP3985 ORDERING INFORMATION Nominal Output Voltage Marking 1.8 V LKA NCP3985SN25T1G 2.5 V LKD NCP3985SN275T1G 2.75 V LKE NCP3985SN28T1G 2.8 V LKB NCP3985SN30T1G 3.0 V LKC NCP3985SN33T1G 3.3 V LKF Device NCP3985SN18T1G Package Shipping† TSOP-5 (Pb-Free) 3000 / Tape & Reel †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. http://onsemi.com 9 NCP3985 PACKAGE DIMENSIONS TSOP-5 CASE 483-02 ISSUE H NOTE 5 2X 0.10 T 2X 0.20 T 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. D 5X 0.20 C A B M 5 1 4 2 3 B S K L DETAIL Z G A J C 0.05 SEATING PLANE H 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 DIM A B C D G H J K L M S DETAIL Z T SOLDERING FOOTPRINT* 0.95 0.037 1.9 0.074 2.4 0.094 1.0 0.039 0.7 0.028 SCALE 10:1 mm Ǔ ǒinches *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: [email protected] 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 http://onsemi.com 10 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative NCP3985/D