MIC2179

MIC2179 1.5A Synchronous Buck Regulator Features Input Voltage Range: +4.5V to +16.5V Dual-Mode Operation for High Efficiency (up to 96%): - PWM Mode for > 150 mA Load Current - Skip Mode for < 150 mA Load Current 150 mΩ Internal Power MOSFETs at 12V Input 200 kHz Preset Switching Frequency Low Quiescent Current - 1.0 mA in PWM Mode - 600 μA in Skip Mode - < 5 μA in Shutdown Mode Current-Mode Control - Simplified Loop Compensation - Superior Line Regulation 100% Duty Cycle for Low Dropout Operation Current Limit Thermal Shutdown Undervoltage Lockout Applications High-Efficiency, Battery-Powered Supplies Buck (Step-Down) DC/DC Converters Laptop Computers Cellular Telephones Handheld Instruments Battery Chargers General Description The MIC2179 is a 200 kHz synchronous buck (step-down) switching regulator designed for high-efficiency, battery-powered applications. The MIC2179 operates from a 4.5V to 16.5V input and features internal power MOSFETs that can supply up to 1.5A output current. It can operate with a maximum duty cycle of 100% for use in low-dropout conditions. It also features a shutdown mode that reduces quiescent current to less than 5 μA. The MIC2179 achieves high efficiency over a wide output current range by operating in either PWM or skip mode. The operating mode is externally selected, typically by an intelligent system, which chooses the appropriate mode according to operating conditions, efficiency, and noise requirements. T...