UNISONIC TECHNOLOGIES CO., LTD LR1143 LINEAR INTEGRATED CIRCUIT HIGH PSRR, LOW DROPOUT, 400mA ADJUSTABLE LDO REGULATOR DESCRIPTION The UTC LR1143 is a CMOS-based 400mA voltage regulator with low supply current, low dropout, adjustable output voltage, The device offering high PSRR and low dropout. The quiescent current is as low as 35μA, further prolonging the battery life. The UTC LR1143 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handheld wireless devices. The UTC LR1143 consumes typical 0.7μA in shutdown mode. The other features include low dropout voltage, high output accuracy, current limit protection, and enable/shutdown control. FEATURES * Wide operating voltage range : 3.0V~5.5V * Adjustable output voltage * Enable/shutdown control * Low-noise for RF application * Ultra-Fast response in line/load transient * Current limit protection * Output only 1μF capacitor required for stability * High power supply rejection ratio ORDERING INFORMATION Note: Ordering Number LR1143G-xx-AF5-R xx: Output Voltage, refer to Marking Information. www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd Package SOT-25 Packing Tape Reel 1 of 4 QW-R102-056.D LR1143 LINEAR INTEGRATED CIRCUIT MARKING INFORMATION PACKAGE VOLTAGE CODE SOT-25 AD: ADJ PIN CONFIGURATION PIN DESCRIPTION PIN NO. 1 2 3 4 5 PIN NAME VIN GND EN FB VOUT MARKING DESCRIPTION Voltage Input. Ground. Chip Enable (Active High). Output Voltage Feedback. Voltage Output. BLOCK DIAGRAM EN POR OTP Current Limit VIN VREF FB + MOSFET Driver VOUT GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 4 QW-R102-056.D LR1143 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Supply Input Voltage VIN 6 V EN Input Voltage 6 V Power Dissipation (TA=25°C) PD 0.4 W Junction Temperature TJ 150 °C Storage Temperature TSTG -65~+150 °C 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. RECOMMENDED OPERATING CONDITIONS (Note 3) PARAMETER SYMBOL MIN Ambient Temperature Range TA -20 Note: The device is not guaranteed to function outside its operating conditions. TYP MAX 85 UNIT °C THERMAL DATA PARAMETER SYMBOL RATINGS UNIT Junction to Ambient θJA 260 °C/W Note: θJA is measured in the natural convection at TA=25°C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. ELECTRICAL CHARACTERISTICS (VIN=3.7V,TA=25°C, CIN=COUT=1μF, IOUT=20mA, unless otherwise specified) PARAMETER Input Voltage Range Reference Voltage Quiescent Current Shutdown Current Current Limit Dropout Voltage SYMBOL VIN VREF IQ ISHDN ILIM VDROP Load Regulation ∆VLOAD Line Regulation ∆VLINE EN Threshold Logic-Low Voltage Logic-High Voltage EN Pin Current FB Pin Current Power Supply Rejection Ratio Output Noise Voltage TEST CONDITIONS IOUT=0mA VEN=0V 3.0V≤VIN< 5.5V IOUT=400mA 1mA< IOUT<400mA 3.0V ≤ VIN<5.5V VIN=(VOUT + 0.5V)~5.5V, IOUT=1mA VIL VIH IEN IFB PSRR VON 0.01 0 1.6 f=1kHz, IOUT=10mA f=10kHz, IOUT=10mA VOUT=1.5V, COUT=1μF, IOUT=0mA UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN TYP MAX 3.0 5.5 1.188 1.200 1.212 35 50 0.7 1.5 400 650 800 0.1 0.1 67 56 30 UNIT V V μA μA mA mV 1 % 0.2 %/V 0.6 5.5 1 1 V V μA μA dB dB μVRMS 3 of 4 QW-R102-056.D LR1143 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 4 QW-R102-056.D