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MIC2177
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Part Number: MIC2177

Description: The Micrel MIC2177 is a 200kHz synchronous buck (stepdown) switching regulator designed for high-efficiency, battery- p...

MIC2177 General Description

The Micrel MIC2177 is a 200kHz synchronous buck (stepdown) 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 shutdown mode that reduces quiescent current to less than 5A.

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-lead wide power SO package with an operating temperature range of 40°C to +85°C.

MIC2177 Maximum Ratings

Supply Voltage [100ms transient] (V_IN) ..................... 18V
Output Switch Voltage (V_SW) ..................................... 18V
Output Switch Current (I_SW) ..................................... 6.0A
Enable, Output-Sense Voltage (V_EN, V_OUT) .................18V
Sync Voltage (V_SYNC) ....................................................6V

MIC2177 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
• 100mW internal power MOSFETs at 12V input
• 200kHz preset switching frequency
• Low quiescent current
       1.0mA in PWM mode
       500mA in skip mode
       < 5mA 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

MIC2177 Typical Application

• High-efficiency, battery-powered supplies
• Buck (step-down) dc-to-dc converters
• Cellular telephones
• Laptop computers
• Hand-held instruments
• Battery Charger

MIC2177 Connection Diagram

MIC2177 datasheet

MIC2177
PDF/DataSheet Download

Datasheet: MIC2177
File Size: 186033 KB
Manufacturer: MICREL [Micrel Semiconductor]
Click here to Download

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