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
(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)
Original Press release
Micrel Semiconductor Inc.
1849 Fortune Dr.
San Jose, CA, 95131
USA
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 www.micrel.com.
Features
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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