MIC28510 12V EV: 12V @ 4A, 5 ~ 75V in, Buck

Summary

The MIC28510 DC/DC regulator operates over an input supply range of 4.5 to 75 V and provides a regulated output at up to 4 A of current. The output voltage is adjustable down to 0.8 V with a typical accuracy of ±1%. The switching frequency is adjustable and once adjusted the switching frequency remains fairly constant with changes in input voltage and output load.

The MIC28510 evaluation board requires only a single power supply with at least 10 A current capability. A linear regulator, which includes a Zener and an NPN transistor, has been installed on the board to provide housekeeping (Vdd) for the MIC28510. The output load can either be a passive or an active load.

The MIC28510 evaluation board does not have reverse polarity protection. Applying a negative voltage to the PVIN and GND terminals may damage the device. The maximum PVIN of the board is rated at 75 V. Exceeding 75 V on the PVIN could damage the device.

Specifications

Manufacturer	Microchip Technology
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	576-4024-ND
Eval Board Supplier	Microchip Technology
Eval Board	Board not Stocked
Topology	Step Down
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	12 V
Current Out	4 A
Voltage In	5 ~ 75 V
Efficiency @ Conditions	>95%, 24V in, 12V @ 1.2 ~ 4 A >95%, 18V in, 12V @ 0.5 ~ 4 A >93%, 30V in, 12 V @ 1 ~ 4 A >90%, 48V in, 12V @ 1.4 ~ 4 A >86%, 75V in, 12V @ 2 ~ 40 A
Voltage Out Range	0.8 ~ 12 V
Features	Current Foldback Protection Current Limit (Adj. or Fixed) Short Circuit Protection Shutdown, Enable, Standby Soft Start Thermal Protection
Switching Frequency	100 ~ 500 kHz
Standby Current [Typical]	700 µA
Quiescent Current [Typical]	1.4 mA
Component Count + Extras	35 + 30
Internal Switch	Yes
Design Author	Microchip Technology
Application / Target Market	Power: Auxiliary Power Supply Power: Industrial Power Solar Powered Back-up Telecom
Standby Current [Maximum]	2 mA
Quiescent Current [Maximum]	3 mA
Main I.C. Base Part	MIC28510
Date Created By Author	2012-03
Date Added To Library	2014-02