MIC2169B Datasheet | Micrel Semiconductor

500k Hz PWM Synchronous Buck Control IC General Description Features The MIC2169B is a high-efficiency, simple to use 500k Hz PWM synchronous buck control IC housed in small MSOP-10 and MSOP-10 e Pad packages. The MIC2169B allows pact DC/DC solutions with a minimal external ponent count and cost. The device Features highoutput driver capability to drive loads up to 30A. - 3V to 14.5V input voltage range - Adjustable output voltage down to 0.8V - 500k Hz PWM operation - Up to 95% efficiency - Output Pre-biased Protection The MIC2169B 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 within the smallest possible printed circuit board space area. The MIC2169B 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 currentlimiting digital soft-start. The MIC2169B is identical to the MIC2169A with the exception that the MIC2169B supports pre-bias loads and has a lower impedance gate-drive circuit. Internal pre-bias circuit prevents output voltage drooping and excessive reverse inductor current when powering up with a pre-bias voltage at the output. - Build-in 2.2Ω drivers to drive two n-channel MOSFETs - Adaptive gate drive increases efficiency - Simple, externally-pensated voltage-mode PWM control - Short minimum ON time of 30ns allowing very-low duty cycle - Fast transient response - Adjustable current limit senses high-side N-Channel MOSFET current - Hiccup mode short-circuit protection - No external current-sense resistor - Internal soft-start current source - Dual function P and EN pin allows...