Dual Low-Dropout CMOS Voltage Regulator

Size: px

Start display at page:

Download "Dual Low-Dropout CMOS Voltage Regulator"

Shannon Johnson
5 years ago
Views:

1 Solved by TM Low-Dropout CMOS Voltage Regulator Features Very Low Dropout Voltage Guaranteed 15mA for Each Output Accurate to Within 1.5% for Both Outputs Typical 7 µa Quiescent Current Over-Temperature Shutdown Current Limiting Noise Reduction Bypass Cap Power-Saving Shutdown Mode Available in Lead Free, RoHS Compliant Packaging: 6Pin & 8Pin DFN Applications Cellular Phones Palm / Notebook Battery Powered Equipment Handheld Devices Top View DESCRIPTION The dual, low dropout, linear regulators operate up to 5.5V input and deliver up to 15mA/15mA output current per regulator. It has a bypass pin option which allows users to decouple the bandgap reference for reducing the output noise. Low dropout voltage and low quiescent current (7µA typ.) make them ideal for battery powered applications. The is available with a wide variety of standard voltage options and can be trimmed to 1.5% accuracy. For protection purposes, has a thermnal shutdown feature to prevent device failure under the"worst" operating conditions. TYPICAL APPLICATION CIRCUITS without Bypass with Bypass EN1 EN2 GND V OUT1 V OUT2 V OUT2 V OUT1 V OUT1 EN V OUT2 BYP GND V OUT2 V OUT1 1nF Aug17-7 Rev S Low-Dropout CMOS Voltage Regulator 27 Sipex Corporation

2 ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Input Voltage...6V Output Current...Pd / [2Vin - (Vout1+Vout2)]mA Output Voltage...GND-.3 to Vin+.3V ESD Classification...HBM C:4V+ Ambient Temperature Range (Ta)...-4 C to 85 C Junction Temperature Range (Tj)...-4 C to 85 C Lead Temperature (Soldering, 1 sec)...35 C Maximum Junction Temperature...15 C Thermal Resistance θ JC TSOT C/W DFN C/W Thermal Resistance θ JA TSOT C/W DFN C/W Internal Power Dissapation Pd TSOT mW DFN mW Unless specified: T J =25 O C, =Higher V OUT +V, I OUT =I OUT2 =ma, C IN =C OUT =.µf, V EN =V EN2 = Typical values are at T J =25 O C IN Parameter Symbol Test Condition Min Typ Max Units Input Supply Voltage Note 5.5 V Quiescent Current IQ 7 6 µa OUT1, OUT2 Output Voltage Line Regulation REG LINE V OUT +V< <5.5V, IOUT=mA T J =25 o C T J =-4 o C to +25 o C Load Regulation REGLOAD ma<iout TJ = o C to +25 o C %/ma Dropout Voltage Current Limit ILIM 8 6 Short Circuit Current I SC Each Channel 2 35 Ripple Rejection Output Voltage Noise EN1, EN2 Input Threshold EN Input Bias Current Aug17-7 Rev S Low-Dropout CMOS Voltage Regulator 27 Sipex Corporation µvrms 5.5 µv/ HZ VEH VIN=2.4V to 5.5V 2.4 V T J =-4 o C to +25 o C V EL =2.4V to 5.5V.4 V I EL IEH EN=V VIN=5.V EN=5V -.5 Shutdown Current I SHDN =5.V, EN=EN2=V.3 BYP V O IOUT=mA f=khz, CB Y P=nF, IOUT=mA f=khz to khz CBYP=nF, COUT=µF f=khz to khz T J = o C to +25 o C C BYP =nf, C OUT =µf Start-Up Rise Time C BYP =nf.25 ms Over Temperature Protection PSRR e n ma<i OUT <=5mA V OUT +V< <5.5V f=hz, CB Y P=nF, IOUT=mA f=kh Z, C B Y P =nf, I OUT =ma Over Temperature Shutdown OTS 5 Over Temperature Hysteresis OTH 2 Note: (min) = V OUT2 + V Dropout VDROP I OUT =I OUT2 =5mA VO=VO(NOM)-2%, V O(NOM) <2.5V I OUT =I OUT2 =5mA VO=VO(NOM)-2%, V O(NOM) >=2.5V TJ = o C to +25 o C ELECTRICAL SPECIFICATIONS V OUT % %/V mv 3 mv ma db µa o C o C

3 A, B Package with Bypass Pin Number Pin Name Description 1 Vout2 2 GND 3 BYP 4 EN 5 Vin 6 Vout1 PIN DESCRIPTION Regulator 2 Output. Sources up to 15mA continous current. Bypass with a (<.5Ω typ ESR) capacitor to GND Ground. This pin alos functions as heatsink. Solder to a large pad or the circuitboard ground plane to maximize thermal dissapation. Reference Noise Bypass. Bypass with a low leakage 1nF ceramic capacitor for reduced noise at borth outputs. Shutdown control input, active low. Tie this pin to or above 2.4V to enable the device. Tie this pin to or below.4v to turn off the device. Regulator Input. Supply voltage can range from [Vout2 + 1V] to 5.5V. This input also supplies the on-chip reference. Bypass with a to GND. Regulator 1 Output. Sources up to 15mA continious current. Bypass with a (<.5Ω typ ESR) capacitor to GND.,G,H,J,K Package without Bypass Pin Number Pin Name Description 1 Vout2 Regulator 2 Output. Sources up to 15mA continous current. Bypass with a (<.5Ω typ ESR) capacitor to GND 2 GND Ground. This pin alos functions as heatsink. Solder to a large pad or the circuitboard ground plane to maximize thermal dissapation. 3 EN1 Shutdown 1 control input, active low. Tie this pin to or above 2.4V to enable the device. Tie this pin to or below.4v to turn off the device. 4 EN2 Shutdown 2 control input, active low. Tie this pin to or above 2.4V to enable the device. Tie this pin to or below.4v to turn off the device. 5 Vin Regulator Input. Supply voltage can range from [Vout2 + 1V] to 5.5V. This input also supplies the on-chip reference. Bypass with a to GND. 6 Vout1 Regulator 1 Output. Sources up to 15mA continious current. Bypass with a (<.5Ω typ ESR) capacitor to GND.,L,M DFN Package without Bypass Pin Number Pin Name Description 1 Vin Regulator Input. Supply voltage can range from [Vout2 + 1V] to 5.5V. This input also supplies the on-chip reference. Bypass with a to GND. 2 EN1 Shutdown 1 control input, active low. Tie this pin to or above 2.4V to enable the device. Tie this pin to or below.4v to turn off the device. 3 EN2 Shutdown 2 control input, active low. Tie this pin to or above 2.4V to enable the device. Tie this pin to or below.4v to turn off the device. 4 NC Not Connected 5 GND Ground. This pin alos functions as heatsink. Solder to a large pad or the circuitboard ground plane to maximize thermal dissapation. 6 NC Not Connected Vout2 Regulator 2 Output. Sources up to 15mA continious current. Bypass with a (<.5Ω typ ESR) capacitor to GND. 6 Vout1 Regulator 1 Output. Sources up to 15mA continious current. Bypass with a (<.5Ω typ ESR) capacitor to GND. Aug17-7 Rev S Low-Dropout CMOS Voltage Regulator 27 Sipex Corporation 3

4 FUNCTIONAL BLOCK DIAGRAM EN1 ON/OFF Control Error Amp1 Current Limit VR1 Each Circuit R11 V OUT1 R12 GND VR2 Each Circuit Error Amp2 Current Limit R21 V OUT2 EN2 ON/OFF Control Voltage Reference R22 Top View AEK1 BEK1 1. Vout2 2. GND 3. BYP 4. EN 5. Vin 6. Vout1 *Die Attach: Conductive Epoxy Top View FEK1 GEK1 HEK1 JEK1 KEK1 1. Vout2 2. GND 3. BYP 4. EN 5. Vin 6. Vout1 PINOUTS *Die Attach: Conductive Epoxy DFN-8 (3mmx3mmx.75mm) Top View LER6 MER6 1. Vin 2. EN1 3. EN2 4. NC 5. GND 6. NC 7. Vout2 8. Vout1 *Die Attach: Conductive Epoxy Aug17-7 Rev S Low-Dropout CMOS Voltage Regulator 27 Sipex Corporation 4

5 THeorY of operation The is a low-dropout, low quiescent-current linear regulator designed primarily for battery-powered applications. These parts are available with preset output voltage ranging from 1.8V to 3.3V, and the parts can supply loads up to 15mA. Shutdown A & B The A and B have a single shutdown control input (EN). Drive EN low to shutdonw boh outputs, reducing supply current to.3µa. Connect EN to a logic-high, or IN, for normal operation. F-M The F-M have independent shutdown control inputs (EN1 and EN2). Drive EN1 low to shutdwon Vout1. Drive EN2 low to shutdown Vout2. Drive both EN1 and EN2 to shut down the entire chip, reducing supply current to.3µa. Connect both EN1 and EN2 to a logic-high, or IN, for normal opreration. APPLICATIOn INFORMATION Thermal-Overload Protection Thermal-Overload protection limits total power dissapation in the. When the juntion temperature exceeds T j = 15ºC, the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the IC to cool. Capacitor Selection and Regulator Stability Use a capacitor in the outputs. Larger input capacitor values and lower ESRs provide better supply noise rejection and line transient response. PSRR and Operation from sources other than Batteries The is designed to deliver low dropout voltages and low quiescent current in battery powered systems. Power-supply rejection is 54dB at low frequencies. (see the PSRR vs. Frequency graph) Internal P-Channel Pass Transistor The features two 1Ω P-Channel MOSFET pass transistors. A P-Channel MOSFET provides several advantages over simialr designs using PNP pass transistors, inculding longer battery life. It requires no base drive, which reduces quiescent current significantly. The only consumes 7µA of quiescent surrent whether in droput, light-load, or heavy load applications. Current Limit The contains two independent current limiters, one for each regulator, which monitor and control the pass transistor's gate voltage, limiting the guaranteed maximum output curent to 18mA minimum. The outputcan be shorted to ground for an indefinate time without damaging the part. Aug17-7 Rev S Low-Dropout CMOS Voltage Regulator 27 Sipex Corporation 5

6 TYPICAL PERFORMANCE characteristics Quiescent Current vs Input Voltage Dropout Voltage vs Load Current 4 3 Quiescent Current (ua) O 25 C 85 O C 55 O C 25 O C -5 O C -45 O C Dropout Voltage (mv) V OUT =2.5V Input Voltage (V) 5 5 Load Current (ma) Supply Current (µa) 8 7 Supply Current vs. Load current Both Output Loaded Load Current (ma) Dropout 15mA (mv) Dropout Voltage vs Output Voltage Output Voltage (V) Quiescent 5V (µa) Quiescent Current vs Temperature Output Voltage (V) Output Voltage vs Temperature V OUT =.8V Temperature ( o C) Temperature ( o C) Aug17-7 Rev S Low-Dropout CMOS Voltage Regulator 27 Sipex Corporation 6

7 TYPICAL PERFORMANCE characteristics 6 5 PSRR vs. Frequency Bypass Line Transient PSRR (db) No-Bypass =2.V V OUT =.8V I LOAD =5mA V out 4.5V 3.5V 1V/DIV 2mV/DIV (AC-Coupled) Frequency (Hz) 5µs/DIV Channel-to-Channel Isolation vs Frequency Load Transient Channel-to-Channel Isolation (db) =5V R LOAD =5Ω V out I LOAD =4.3V I LOAD = to 5mA 2mV/DIV (AC-Coupled) 1mA/DIV.. Frequency (KHz) 1µs/DIV Output Noise Spectral Density Load Transient Near Dropout C BP =µf I OUT =,5,,5mA Noise(µV/ Hz). C BP =.µf I OUT =,5,,5mA Frequency(kHz) V OUT I LOAD =V OUT +.V 1µs/ DIV 2mV/DIV (AC-Coupled) 1mA/DIV Aug17-7 Rev S Low-Dropout CMOS Voltage Regulator 27 Sipex Corporation 7

8 TYPICAL PERFORMANCE characteristics Shutdown Response Output Voltage (1V/DIV) Shutdown Voltage (1V/DIV) R LOAD = Package Dimensions PACKAGE: 6 PIN TSOT Side View Top View D e c L SYMBOLS MILLIMETERS INCHES MIN MAX MIN MAX A+A b H E c D E S e. BSC.748 BSC H Front View L.35BSC.38BSC A θ1 o o o o S 1.5BSC.374BSC b A Aug17-7 Rev S Low-Dropout CMOS Voltage Regulator 27 Sipex Corporation 8

9 Package: 8 Pin DFN Aug17-7 Rev S Low-Dropout CMOS Voltage Regulator 27 Sipex Corporation

10 ORDERING INFORMATION Part Number Voltage Pin3/ Pin4 Trait Voltage Accuracy Operating Temperature Range Package Marking* Packing Quantity AEK1-L/TR V2=2.5V Bypass/ 1.5% -4ºC to +85ºC X9WW 3, BEK1-L/TR V2=2.8V Bypass/ 1.5% -4ºC to +85ºC Y9WW 3, FEK1-L/TR V2=2.5V 1.5% -4ºC to +85ºC DAWW 3, GEK1-L/TR V2=2.8V 1.5% -4ºC to +85ºC EAWW 3, HEK1-L/TR V2=3.3V 1.5% -4ºC to +85ºC FAWW 3, JEK1-L/TR V1=2.85V V2=2.85V 1.5% -4ºC to +85ºC GAWW 3, KEK1-L/TR V1=3.V V2=3.V 1.5% -4ºC to +85ºC HAWW 3, LER6-L/TR V2=2.5V 1.5% -4ºC to +85ºC DFN8 6265LEWWX 1, MER6-L/TR V2=2.8V 1.5% -4ºC to +85ºC DFN8 6265MEWWX 1, *Note: WW = Product Work Week, X = 1st Alpha of Lot Number Solved by Sipex Corporation TM Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 9535 TEL: (48) FAX: (48) Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Aug17-7 Rev S Low-Dropout CMOS Voltage Regulator 27 Sipex Corporation 1

November 2011 Rev FEATURES. Fig. 1: XRP6272 Application Diagram

November 2011 Rev FEATURES. Fig. 1: XRP6272 Application Diagram November 2011 Rev. 1.2.0 GENERAL DESCRIPTION The XRP6272 is a low dropout voltage regulator capable of a constant output current up to 2 Amps. A wide 1.8V to 6V input voltage range allows for single supply