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MIC26901 Evaluation Board
28V, 9A Hyper Speed Control?
Synchronous DC/DC Buck Regulator
SuperSwitcher II?
General Description
The MIC26901 DC-DC regulator operates over an input
supply range of 4.5V to 28V, and provides a regulated output
at up to 9A of output current. The output voltage is adjustable
to 0.8V with a typical accuracy of ±1% and the device
operates at a switching frequency of 600kHz. The switching
frequency remains fairly constant with changes in input
voltage and output load.
Micrel’s Hyper Speed Control TM architecture allows for ultra-
fast transient response, while reducing the output
capacitance. It also makes (High V IN )/(Low V OUT ) operation
possible. The MIC26901 utilizes an adaptive T ON 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.
Note : This evaluation board is for 9A applications.
A datasheet and supporting documentation can be found
on Micrel’s web site at: www.micrel.com .
Requirements
The MIC26901 provides a 5V regulated output for input
voltage V IN, ranging from 5.5V to 28V. When V IN < 5.5V,
V DD should be tied to PVIN pins to bypass the internal
linear regulator by a jumper. The output load can either be
an active or passive load.
Getting Started
1. Connect an external supply to the VIN terminal. Apply
the desired input voltage to the VIN and ground
terminals of the evaluation board, paying careful
attention to polarity and supply voltage. An ammeter
may be placed between the input supply and the VIN
terminal to the evaluation board. Ensure that the
supply voltage is monitored at the VIN terminal. The
ammeter and/or power lead resistance can reduce the
voltage supplied to the input.
2. Connect the load to the V OUT and ground terminals.
The load can be either passive (resistive) or active (as
in an electronic load). An ammeter can be placed
between the load and the V OUT terminal. Ensure that
the output voltage is monitored at the V OUT terminal.
V OUT can be set to 0.9V, 1.0V, 1.2V, 1.5V, 1.8V, 2.5V,
3.3V, or 5.0V by a jumper. If a different voltage is
needed, it can be adjusted by changing the feedback
resistors. See “Output Voltage” section.
3. Enable the MIC26901 . The EN pin is provided on the
evaluation board. The output of the MIC26901 turns on
when V DD exceeds the UVLO threshold. Turn off the
output of the MIC26901 by shorting the EN pin to
ground. A connection on the board provides easy
access to the enable pin.
Ordering Information
Precautions
The evaluation board does not have reverse polarity
protection. Applying a negative voltage to the V IN terminal
may damage the device. In addition, the maximum V IN
operating voltage of the MIC26901 evaluation board is
.
Part Number
MIC26901YJL EV
Description
HSC 9A DC-DC Regulator
Evaluation Board
28V. Exceeding 29V on VIN could damage the device.
Hyper Speed Control is a trademark of Micrel, Inc
MLF and Micro Lead Frame is a registered trademark of Amkor Technology, Inc.
Micrel Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel +1 ( 408 ) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
July 2011
M9999-071511-A
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