PWM Synchronous Buck Control IC offers up to 95% efficiency.

Press Release Summary:

Supplied in MSOP-10 ePad package, 500 kHz MIC2169B allows compact DC/DC solutions with minimal external component count. It operates from 3-14.5 V input without any additional bias voltage and can drive loads up to 30 A. Output voltage can be regulated down to 0.8 V, and adaptive all-N Channel MOSFET drive scheme results in optimal efficiency. Also, current limit accuracy is maintained by positive temperature coefficient that tracks increasing RDS(ON) of external MOSFET

Original Press Release:

MIC2169B: 500kHz PWM Synchronous Buck Control IC

General Description
The MIC2169B is a high-efficiency, simple to use 500kHz PWM synchronous buck control IC housed in a small MSOP-10 ePad package. It allows compact DC/DC solutions with a minimal external component count and cost. The device features high output driver capability to drive loads up to 30A.

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 N-Channel 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 R DS(ON) of the external MOSFET. Further cost and space are saved by the internal in-rush-current limiting digital soft-start. The MIC2169B is identical to the MIC2169A except it supports pre-bias loads. Internal pre-bias circuit prevents output voltage drooping and excessive reverse inductor current when powering up with a pre-bias voltage at the output.

The MIC2169B is available in a thermally capable 10-pin ePad 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


  • 3V to 14.5V input voltage range
  • Adjustable output voltage down to 0.8V
  • 500kHz PWM operation
  • Up to 95% efficiency
  • Output Pre-biased Protection
  • Build-in 2.2 W drivers to drive two N-channel MOSFETs
  • Adaptive gate drive increases efficiency
  • Simple voltage-mode PWM control with externally compensated
  • 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 COMP and EN pin allows low-power shutdown
  • Available in a small size 10-pin MSOP ePad package

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