UNISONIC TECHNOLOGIES CO., LTD LR8845 Preliminary CMOS IC 3A LOW DROPOUT LINEAR REGULATOR DESCRIPTION The UTC LR8845 belonged to low quiescent current, low dropout linear regulators operated from 2.5V to 6V input and are guaranteed to deliver 3A. Wide range of preset output voltage options are available. Built-in low on-resistance transistor provides low dropout voltage and large output current. The UTC LR8845 is designed and optimized for battery-powered systems to work with low noise. The UTC LR8845 consumes less than 2μA in shutdown mode. Other features include ultra low dropout voltage, current limiting protection, thermal shutdown protection and high ripple rejection ratio. FEATURES * 3A Guaranteed Output Current * low quiescent current: 300μA (typ.) * 2μA Shutdown Current * Short Circuit Current Fold-back * Low Temperature Coefficient * Current Limiting Protection * Thermal Shutdown Protection * Excellent Line/Load Transient * SENSE Option Improves Load Regulation ORDERING INFORMATION Ordering Number Lead Free Halogen Free LR8845L-xx-AA3-D-R LR8845G-xx-AA3-D-R LR8845L-xx-TN3-D-R LR8845G-xx-TN3-D-R LR8845L-xx-TN3-D-T LR8845G-xx-TN3-D-T LR8845L-xx-TQ3-D-R LR8845G-xx-TQ3-D-R LR8845L-xx-TQ3-D-T LR8845G-xx-TQ3-D-T Note: 1. Pin assignment: I: VIN O: VOUT G: GND 2. xx: Output Voltage, refer to Marking Information. www.unisonic.com.tw Copyright © 2012 Unisonic Technologies Co., Ltd Package SOT-223 TO-252 TO-252 TO-263 TO-263 Pin Assignment 1 2 3 I G O I G O I G O I G O I G O Packing Tape Reel Tape Reel Tube Tape Reel Tube 1 of 4 QW-R502-750.a LR8845 Preliminary CMOS IC MARKING INFORMATION PACKAGE VOLTAGE CODE MARKING G: Halogen Free L: Lead Free LR8845 Pin Code SOT-223 Voltage Code Date Code 1 2 3 25:2.5V TO-252 TO-263 BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 4 QW-R502-750.a LR8845 Preliminary CMOS IC ABSOLUTE MAXIMUM RATING (TA=25°С) PARAMETER SYMBOL RATINGS UNIT Supply Voltage VIN 7 V Power Dissipation PD Internally limited mW Junction Temperature TJ +150 °С Operation Temperature TOPR -40 ~ +85 °С Storage Temperature TSTG -65 ~ +150 °С Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. THERMAL DATA PARAMETER Junction to Ambient SYMBOL TO-223 TO-252 TO-263 RATINGS 165 108 64 θJA UNIT °С/W ELECTRICAL CHARACTERISTICS (VIN = VOUT + 1V whichever is greater, CIN =0.1µF, COUT =2.2µF (Ceramic), TA= 25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Input Voltage VIN Note1 6 V TA＝25°С , IOUT= 1mA ~3A -2 2 % Output Voltage Accuracy VOUT TA＝0~85°С, IOUT= 1mA~3A -3 3 Maximum Output Current IOUT 3 A Short-Circuit Current Limit ILIMIT VOUT>1.2V 4.5 A Short-Circuit Current ISC VOUT<0.4V 1.7 A 300 400 IOUT = 0mA µA Ground Pin Current IGND IOUT= 1mA to 3A 300 1000 1.5V<=VOUT<=1.8V mV Dropout Voltage (Note 2) VD IOUT=3A 1.8V<VOUT<2.5V 700 2.5<=VOUT 300 450 Line Regulation ΔVOUT ΔVIN × VOUT Load Regulation Output Voltage Noise Shutdown Supply Current Power Supply Rejection Shutdown Threshold ΔVOUT eN IOFF PSRR VIN=VOUT+VD~6V 0.1 0.2 %/V VIN=VOUT+1V, IOUT=10mA~3A f=10Hz to100kHz, COUT=2.2μF 0.2 30 1 % µVRMS 2 10 µA SHDN =GND IOUT=100mA COUT=10μF VIH VIL TSHDN DTSHDN f=100Hz f=1kHz 70 60 dB 2 0.4 Thermal Shutdown Temperature 150 Thermal Shutdown Hysteresis 20 Notes: 1. VIN(MIN)= VOUT+ VDROPOUT 2. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) × 98% UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw V °С 3 of 4 QW-R502-750.a LR8845 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 4 QW-R502-750.a