The MIC2177 is a 200kHz synchronous buck (step-down) switching regulator designed for high-efficiency, battery-powered applications.
The MIC2177 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 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 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 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.
Additional Features
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 mΩ internal 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
The MIC2177 is a 200kHz synchronous buck (step-down) switching regulator designed for high-efficiency, battery-powered applications.
The MIC2177 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 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 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 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.
Additional Features
- 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 mΩ internal 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
