MIC261203YJL EV: 5V @ 12A, 5.5 ~ 28V in, Buck

Summary

The MIC261203 DC/DC regulator operates over an input supply range of 4.5 to 28 V, and provides a regulated output at up to 12 A of output current. The output voltage is adjustable to 0.8 V with a typical accuracy of 1%, the device operates at a switching frequency of 600 kHz. The switching frequency remains fairly constant with changes in input voltage and output load.

Micrel’s Hyper Light Load™ architecture provides the same high-efficiency and ultra-fast transient response as the Hyper Speed Control™ architecture under medium to heavy loads, but also maintains high efficiency under light load conditions by transitioning to variable frequency, discontinuous mode operation.

The MIC261203 utilizes an adaptive TON ripple control architecture. An undervoltage lockout feature is provided to ensure proper operation under power-sag conditions. An Internal soft-start feature is provided to reduce the inrush current. Foldback current limit and “hiccup” mode short-circuit protection and thermal shutdown ensures protection of the IC during fault conditions.

This evaluation board is for 12 A applications.

Specifications

Manufacturer	Microchip Technology
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	576-4014-ND
Eval Board Supplier	Microchip Technology
Eval Board	Board not Stocked
Topology	Step Down
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	5 V
Current Out	12 A
Voltage In	5.5 ~ 28 V
Efficiency @ Conditions	>92%, 12V in, 5V @ 0.3 ~ 12 A >90%, 12V in, 3.3V @ 0.3 ~ 12 A >88%, 12V in, 2.5V @ 0.5 ~ 12 A >85%, 12V in, 1.8V @ 0.8 ~ 11 A >82%, 12V in, 1.5V @ 1.5 ~ 11 A >80%, 12V in, 1.2V @ 1.5 ~ 11 A >80%, 12V in, 1.0V @ 1.5 ~ 8.5 A >78%, 12V in, 0.9V @ 1 ~ 9 A >75%, 12V in, 0.8V @ 1 ~ 10 A
Voltage Out Range	0.8 ~ 5.5 V
Features	Current Foldback Protection Current Limit (Adj. or Fixed) Light Load Mode Power Good Output Short Circuit Protection Shutdown, Enable, Standby Soft Start Thermal Protection Under Voltage Protection, Brown-Out
Switching Frequency	600 kHz
Standby Current [Typical]	5 µA
Quiescent Current [Typical]	450 µA
Component Count + Extras	33 + 26
Internal Switch	Yes
Design Author	Microchip Technology
Application / Target Market	Computers Power: Auxiliary Power Supply Printer, Plotter Telecom
Standby Current [Maximum]	10 µA
Quiescent Current [Maximum]	750 µA
Main I.C. Base Part	MIC261203
Date Created By Author	2011-07
Date Added To Library	2014-02