The MIC2177-3.3BWM is a 200kHz synchronous buck (step-down) switching regulator designed for high-efficiency, battery-powered applications.
The MIC2177-3.3BWM operates from a 4.5V to 16.5V input and features internal power MOSFETs that can supply up to 2.5A output current. It can operate with a maximum duty cycle of 100% for use in low-dropout conditions. It also features a shut down mode that reduces quiescent current to less than 5µA.
The MIC2177-3.3BWM achieves high efficiency over a wide output current range by switching between PWM and skip mode. Operating mode is automatically selected according to output conditions. Switching frequency is preset to 200kHz and can be synchronized to an external clock signal of up to 300kHz.
The MIC2177-3.3BWM 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 MIC2177-3.3BWM is packaged in a 20-pin wide power SO package with an operating temperature range of -40°C to +85°C.
See the MIC2178 for externally selected PWM or skip-mode operation.
Feature
- 4.5V to 16.5V input voltage range
- Dual-mode operation for high efficiency (up to 96%)
- PWM mode for > 200mA load current
- Skip mode for < 200mA load current
- 100 mΩinternal power MOSFETs at 12V input
- 200kHz preset switching frequency
- Low quiescent current
- 1.0mA in PWM mode
- 500µA in skip mode
- < 5µA in shutdown mode
- 100% duty cycle for low dropout operation
- Current-mode control
- Simplified loop compensation
- Superior line regulation
- Current limit
- Thermal shutdown
- Undervoltage lockout
