MIC2954-03WS Microchip

MIC2954 250 mA Low Dropout Regulator Features General Description High Accuracy 5V, Ensured 250 mA Output The MIC2954 is an efficient voltage regulator with very low dropout voltage (typically 40 mV at light loads and Low Quiescent Current 375 mV at 250 mA), and low quiescent current (120 A Low Dropout Voltage typical). The quiescent current of the MIC2954 Extremely Tight Load and Line Regulation increases only slightly in dropout, thus prolonging Very Low Temperature Coefficient battery life. Key MIC2954 features include protection Current and Thermal Limiting against reversed battery, fold-back current limiting, and Input Withstands 20V Reverse Battery and +60V automotive load dump protection (60V positive transient). Positive Transients Error Flag Warns of Output Dropout The MIC2954-07/08YM is an adjustable version that includes an error flag output that warns of a low output Logic-Controlled Electronic Shutdown voltage, which is often due to failing batteries on the Output Programmable from 1.24V to 29V input. This may also be used as a power-on reset. A (MIC2954-07/-08) logic-compatible shutdown input is provided that Available in TO-220-3 and Surface-Mount enables the regulator to be switched on and off. This SOT-223 and SOIC-8 Packages part may be pin-strapped for 5V output or programmed from 1.24V to 29V with the use of two external Applications resistors. Battery-Powered Equipment The MIC2954 is available in two voltage tolerances, Cellular Telephones 0.5% maximum and 1% maximum. Both are Laptop, Notebook, and Palmtop Computers guaranteed for junction temperatures from 40C to PCMCIA V and V Regulation/Switching CC PP +125C. Barcode Scanners Automotive Electronics SMPS Post-Regulators/DC-DC Modules Voltage Reference High-Efficiency Linear Power Supplies Package Types MIC2954 MIC2954 3-Lead SOT-223 (S) 8-Lead SOIC (M) OUT 1 8IN SNS 2 7 FB SHDN 3 6 TAP GND 4 5 ERR MIC2954 1 23 3-Lead TO-220 (T) IN GND OUT 3 OUT 2 GND 1IN 2021 Microchip Technology Inc. DS20006563A-page 1 TABMIC2954 Typical Application Circuits MIC2954 FIXED 5V REGULATOR MIC2954 ADJUSTABLE REGULATOR 100k V ERR MIC2954 V V IN OUT V IN OUT OUT MIC2954 V 1.2V to 30V IN 8 1 IN OUT GND R1 3 5 2.2F SHDN ERR SHUTDOWN 7 ENABLE FB 10F GND 100pF 4 R2 V REF R1 MIC2954 5V OR 3V SELECTABLE REGULATOR VV=+1 ( ) OUT REF R2 2, 6 = OPEN WITH SHUTDOWN V V IN OUT MIC2954-07/-08 +7V 5V or 3.3V 100pF 8 1 MIC2954 WIDE INPUT VOLTAGE RANGE CURRENT LIMITER IN OUT 300k 3 5 SHDN ERR 1% MIC2954-07/-08 SHUTDOWN 7 ENABLE FB V V V * 3.3F IN OUT IN 8 1 GND IN OUT 220k 180k 4 3 5 * MINIMUM INPUT-TO-OUTPUT 1% 1% SHDN ERR VOLTAGE RANGES FROM 5V SHUTDOWN 40mV TO 400mV DEPENDING 7 3.3V 470k ENABLE FB UPON LOAD CURRENT Q1 GND Q1 ON = 3.3V 2N2222 Q1 OFF = 5.0V 4 Functional Block Diagrams MIC2954-02 and MIC2954-03 Unregulated IN DC Supply OUT 5V/250mA Output Error Amp. 182k 62k 2.2F 1.23V REF. GND MIC2954-02/-03 MIC2954-07 and MIC2954-08 Unregulated FB IN DC Supply OUT 5V/250mA Output SNS Error Amp. 182k 330k TAP SHDN 60k TTL/CMOS 60mV Error Detection Control Logic Comparator Input TTL/CMOS ERR Compatible Error Output 1.23V REF. GND MIC2954-07/-08 DS20006563A-page 2 2021 Microchip Technology Inc.