ADM00891 Microchip

MIC2253 High Current 1 MHz High Efficiency Boost Regulator with OVP and Soft-Start Features General Description 3.5A Minimum Switch Current The MIC2253 is a high power-density, 1 MHz PWM DC/DC boost regulator. The 3.5A minimum switch 1.245V 3% Feedback Voltage current limit, combined with a 1MHz switching 2.5V to 10V Input Voltage frequency, allows the MIC2253 to use smaller inductors Output Overvoltage Protection (OVP) and deliver high power in a tiny solution size. Externally Programmable Soft-Start The 2.5V to 10V input voltage range of MIC2253 allows Output Voltage Up to 30V direct operation from 1- and 2-cell Li-ion as well as 3- Fixed 1 MHz Operation to 4-cell NiCad, NiMH, alkaline, or lithium batteries. <1% Line Regulation Maximum battery life is assured with a low 0.1 A shutdown current. 0.1 A Shutdown Current Overtemperature Protection The MIC2253 is available in a low profile 12-pin 3 mm x 3 mm DFN package. To prevent a high inrush current, Undervoltage Lockout (UVLO) a minimum 1 ms soft-start period is set by default and 12-Pin 3 mm x 3 mm Leadless DFN Package the MIC2253 has the ability to extend the soft-start 40C to +125C Junction Temperature Range period with an external capacitor. Applications Mobile Handsets Portable Media/MP3 Players Portable Navigation Devices (GPS) WiFi/WiMax/WiBro Modules Digital Cameras Wireless LAN Cards USB-Powered Devices Portable Applications Package Type MIC2253 Efficiency vs. Output Current, V = 5.0V OUT 12-Pin 3 mm x 3 mm DFN (ML) (Top View) 1 12 NC COMP 2 11 SS EN FB 3 10 VIN 4 9 AGND OVP 5 8 PGND SW EP 6 7 PGND SW 2018 Microchip Technology Inc. DS20006070A-page 1MIC2253 Typical Application Circuit 2.2H VOUT = 3.8V Unregulated 22F +3.3V 10V VIN SW 2.2F 100pF OVP EN1 N MIC2253 FB SS COMP N Optional AGND PGND 10nF GND Functional Block Diagram DS20006070A-page 2 2018 Microchip Technology Inc.