MIC2169A

MIC2169A MIC2169A Micrel 500kHz PWM Synchronous Buck Control IC General Description The MIC2169A is a high-efficiency, simple to use 500kHz PWM synchronous buck control IC housed in a small MSOP10 package. The MIC2169Aallows compact DC/DC solutions with a minimal external component count and cost. The MIC2169A operates from a 3V to 14.5V input, without the need of any additional bias voltage. The output voltage can be precisely regulated down to 0.8V. The adaptive all N‑Channel MOSFET drive scheme allows efficiencies over 95% across a wide load range. The MIC2169A senses current across the high-side NChannel MOSFET, eliminating the need for an expensive and lossy current-sense resistor. Current limit accuracy is maintained by a positive temperature coefficient that tracks the increasing RDS(ON) of the external MOSFET. Further cost and space are saved by the internal in-rush-current limiting digital soft-start. The MIC2169A is available in a 10-pin MSOP package, with a wide junction operating range of –40°C to +125°C. All support documentation can be found on Micrel’s web site at www.micrel.com. Features 3V to 14.5V input voltage range Adjustable output voltage down to 0.8V Up to 95% efficiency 500kHz PWM operation Adjustable current limit senses high-side N-Channel MOSFET current No external current-sense resistor Adaptive gate drive increases efficiency Overvoltage protection protects the load in fault conditions Dual mode current limit speed...