AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Description Pin Assignments The AP7331 is a 300mA, adjustable and fixed output SOT25 (Fixed Output) SOT25 (ADJ Output) voltage, low dropout linear regulator. The device included (Top View) (Top View) pass element, error amplifier, band-gap, current limit and thermal shutdown circuitry. The device is turned on when EN 1 5 IN OUT pin is set to logic high level. 2 GND The characteristics of low dropout voltage and low quiescent current make it suitable for low power applications, for EN 3 4 NC example, battery powered devices. The typical quiescent current is approximately 65A. Built-in current-limit and thermal-shutdown functions prevent DFN2020-6 (Fixed Output) DFN2020-6 (ADJ Output) IC from damage in fault conditions. (Top View) (Top View) The AP7331 is available in SOT25 and DFN2020-6 EN 1 6 NC EN 1 6 ADJ packages. 2 5 GND GND 2 5 NC NC 3 OUT 3 4 OUT IN 4 IN Features Applications 300mA Low Dropout Regulator with EN XDSL Routers Very low I over full load: 65A Wireless LAN Cards Q Wide input voltage range: 2V to 6V Desktop and Notebook Computers Wide adjustable output: 0.8V to 5.0V Battery Powered Equipments Fixed output options: 1.0V to 3.3V PSRR: 65dB typical at 100Hz Fast start-up time: 80s Stable with low ESR, 1F ceramic output capacitor Excellent Load/Line Transient Response Low dropout: 300mV typical at 300mA Current limit protection Short circuit protection Thermal shutdown protection Ambient temperature range: -40C to 85C SOT25 and DFN2020-6: Available in Green Molding Compound (No Br, Sb) Lead Free Finish/RoHS Compliant (Note 1) Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at AP7331 300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT LOW DROPOUT LINEAR REGULATOR Typical Application Circuit V V V IN V IN OUT OUT IN OUT IN OUT AP7331 AP7331 R1 1uF 1uF 1uF 1uF Enable Enable ADJ EN EN GND GND R2 Adjustable Output Fixed Output R 1 V = V 1 + OUT REF R 2 Pin Descriptions Pin Number Pin Name SOT25 DFN2020-6 SOT25 DFN2020-6 Description (fixed) (fixed) (adj) (adj) Voltage input pin. Bypass to ground through at least IN 1 3 1 3 1F capacitor GND 2 2 2 2 Ground EN 3 1 3 1 Enable input, active high ADJ - - 4 6 Output feedback pin NC 4 5, 6 - 5 No connection Voltage output pin. Bypass to ground through 1F OUT 5 4 5 4 ceramic capacitor Functional Block Diagram IN OUT IN OUT Current Limit Current Limit Gate Gate EN and Thermal Driver EN and Thermal Shutdown R Driver Shutdown ADJ 0.4V 0.4V R GND GND Fixed Version Adjustable Version 2 of 13 January 2011 AP7331 Diodes Incorporated www.diodes.com Document number: DS31914 Rev. 3 - 2