PWM Synchronous Buck Control IC offers up to 95% efficiency.
July 30, 2010 -
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
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|Original Press release |
Micrel Semiconductor Inc.
1849 Fortune Dr.
San Jose, CA, 95131
MIC2169B: 500kHz PWM Synchronous Buck Control IC
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 www.micrel.com.
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