MIC2182 Datasheet | Microchip Technology

Features - 4.5V to 32V Input Voltage Range - 1.25V to 6V Output Voltage Range - 95% Efficiency - 300 k Hz Oscillator Frequency - Current Sense Blanking - 5Ω Impedance MOSFET Drivers - Drives N-channel MOSFETs - 600 µA Typical Quiescent Current (Skip-Mode) - Logic Controlled Micropower Shutdown (IQ < 0.1 µA) - Current-Mode Control - Cycle-by-Cycle Current Limiting - Built-In Undervoltage Protection - Adjustable Undervoltage Lockout - Easily Synchronizable - Precision 1.245V Reference Output - 0.6% Total Regulation - 16-Lead SOIC and SSOP Packages - Frequency Foldback Overcurrent Protection - Sustained Short-Circuit Protection at Any Input Voltage - 20A Output Current Capability Applications - DC Power Distribution Systems - Notebook and Subnotebook puters - PDAs and Mobile municators - Wireless Modems - Battery-Operated Equipment General Description The MIC2182 is a synchronous buck (step-down) switching regulator controller. An all N-channel synchronous architecture and powerful output drivers allow up to a 20A output current capability. The PWM and skip-mode control scheme allows efficiency to exceed 95% over a wide range of load current, making it ideal for battery powered applications, as well as high current distributed power supplies. The MIC2182 operates from a 4.5V to 32V input and can operate with a maximum duty cycle of 86% for use in low- dropout conditions. It also features a shutdown mode that reduces quiescent current to 0.1 µA. The MIC2182 achieves high efficiency over a wide output current range by automatically switching between PWM and skip mode. Skip-mode operation enables the converter to maintain high efficiency at light loads by turning off circuitry pertaining to PWM operation, reducing the no-load supply current from 1.6 m A to 600 µA. The operating mode is internally selected according to the output load conditions. Skip mode can be defeated by pulling the PWM pin low which reduces noise and RF interference. The MIC2182 is available in a...