MIC2179YSM

Product Summary

The MIC2179YSM is a 200kHz synchronous buck (stepdown) switching regulator designed for high-efficiency, battery-powered applications. The MIC2179YSM 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 5μA. The MIC2179YSM 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. The switching frequency is preset to 200kHz and can be synchronized to an external clock signal of up to 300kHz. The MIC2179YSM uses current-mode control with internal current sensing. Current-mode control provides superior line regulation and makes the regulator control loop easy to compensate. The output is protected with pulse-by-pulse current limiting and thermal shutdown. Undervoltage lockout turns the output off when the input voltage is less than 4.5V. The MIC2179YSM is packaged in a 20-lead SSOP package with an operating temperature range of –40℃ to +85℃.

Parametrics

MIC2179YSM absolute maximum ratings: (1)Supply Voltage [100ms transient] (VIN): 18V; (2)Output Switch Voltage (VSW): 18V; (3)Output Switch Current (ISW): 6.0A; (4)Enable, PWM Control Voltage (VEN, VPWM): 18V; (5)Sync Voltage (VSYNC): 6V.

Features

MIC2179YSM features: (1)4.5V to 16.5V input voltage range; (2)Dual-mode operation for high efficiency (up to 96%): PWM mode for > 150mA load current, Skip mode for <150mA load current; (3)150mΩ internal power MOSFETs at 12V input; (4)200kHz preset switching frequency; (5)Low quiescent current: 1.0mA in PWM mode, 600μA in skip mode, < 5μA in shutdown mode; (6)Current-mode control: Simplified loop compensation, Superior line regulation; (7)100% duty cycle for low dropout operation; (8)Current limit; (9)Thermal shutdown; (10)Undervoltage lockout.

Diagrams