Product category:
Power Supply ICs and Controllers
News Release from: Micrel | Subject: MIC2168 and MIC2169
Edited by the Electronicstalk Editorial
Team on 19 February 2004
Controllers raise efficiency at point of
load
The MIC2168 and MIC2169 DC/DC synchronous buck control ICs provide high efficiency, small size, point-of-load DC/DC conversion for networking, telecomms, server, set-top box and storage applications.
The MIC2168 and MIC2169 DC/DC synchronous buck control ICs provide high efficiency, small size, point-of-load DC/DC conversion for networking, telecomms, server, set-top box and storage applications The MIC2168 operates at a fixed 1MHz PWM operating frequency - a speed that allows the use of the smallest external components
This article was originally published on Electronicstalk on 5 Dec 2000 at 8.00am (UK)
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The MIC2169 operates at 500KHz which allows the highest level of efficiency, especially in high output current applications where the IC is driving large mosfets with high gate charge.
With a proprietary adaptive gate drive technique that reduces mosfet shoot-through current, both devices are capable of efficiencies over 95%.
The MIC2168 and MIC2169 operate from a wide 3 to 14.5V input voltage range allowing the devices to step voltages down in systems with 3.3, 5 and 12V power buses.
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With a programmable minimum output voltage of 0.8V, the MIC2168/9 can power the latest generation CPUs, DSPs, FPGAs and ASICs.
Their internal gate drivers easily allow the devices to power external mosfets that can provide 20A of output current.
Offered in a small, low-pin count MSOP-10 package, the MIC2168 and MIC2169 save valuable board space compared to bigger SOP-packaged solutions.
The low pin count reduces design complexity and external components.
Significant cost savings are achieved by eliminating the need for an expensive current sensing resistor by instead sensing current through the high-side N-channel mosfet.
Current limit accuracy is maintained by a positive temperature coefficient that tracks the increasing on-resistance of the external mosfet.
Additionally, with its the built-in soft start, the MIC2168/9 reduces inrush current while eliminating the need for an external soft-start capacitor.
The MIC2168 and MIC2169 offer a high degree of safety features.
A dual mode current limit protects the external mosfets while allowing the fastest recovery time from current limit conditions.
Short circuit protection, overtemperature shutdown, and output overvoltage protection protects the expensive load circuitry downstream in case of fault conditions.
"The MIC2168 and MIC2169 answer our customer requests for small, simple, and cost-effective solutions for their point-of-load DC/DC applications.
With these devices, we've been able to eliminate several external components, while still achieving a very high level of performance and flexibility.
Depending on the customer size and cost requirements, the MIC2168 and MIC2169 can be configured for all-ceramic, tantalum or electrolytic capacitor solutions", says Tony Grizelj, Micrel's Marketing Manager for Power Products.
The MIC2168 and MIC2169 are available in MSOP-10 packages.
The devices are priced at $1.92 and $1.74 in 1000-piece quantities, respectively.
Samples are available from stock, and production quantities are stock to 12 weeks ARO.
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