MIC26603 Evaluation Board
28V, 6A HyperLight Load
®
Synchronous DC-DC Buck Regulator
SuperSwitcher IIG™
Hyper Light Load and Hyper Speed Control are trademarks of Micrel, Inc.
MLF and MicroLead Frame are registered trademarks 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
er
lat
t current. The output voltage is a
th
he
e
rov
sp
m
un
fr
T
ON
ripp
r
er-sag condi
rt feature is provided to reduce th
sh
tio of the IC
ns
et and supporting documentation
General Description
The MIC26603 DC-DC regulator operates ov
supply range of 4.5V to 28V and provides a regu
at up to 6A of outpu
an input
ed output
djustable
e device
switching
to 0.8V with a typical accuracy of ±1%, and
operates at a switching frequency of 600kHz. T
frequency remains fairly constant with chang
voltage and output load.
Micrel’s Hyper Light L
s in input
ides the
onse as
edium to
der light
equency,
oad™ architecture p
same high-efficiency and ultra-fast transient re
the Hyper Speed Control™ architecture under
heavy loads, but also maintains high efficiency
load conditions by transitioning to variable
discontinuous mode operation.
The MIC26603 utilizes an adaptive le control
ovided to
tions. An
e inrush
ort-circuit
architecture. An undervoltage lockout feature is p
ensure proper operation under pow
internal soft-sta
current. Foldback current limit and “hiccup” mode
protection and thermal shutdown ensures protec
during fault conditions.
Note: This evaluation board is for 6A applicatio
n
.
The datashe can be
found on Micrel’s web site at: www.micrel.com
.
Requirements
The MIC26603 provides a 5V regulated outp
voltage V
IN
ranging from 5.5V to 28V. When
ut for input
V
IN
< 5.5V,
VDD 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.
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 MIC26603 evaluation board is
28V. Exceeding 29V on VIN could damage the device
capacitance and also makes (High V
IN
)/(Low V
OUT
).
ly to the V
IN
terminal.
e to the V
IN
and ground
board, paying careful
ly voltage. An ammeter
d ut supply and the V
IN
oard. Ensure that the
at the V
IN
terminal. The
resistance can reduce
put.
e V
OUT
and ground
ither passive (resistive)
load). An ammeter can
and the V
OUT
terminal.
s monitored at the
set to 0.9V, 1.0V, 1.2V,
5.0V by a jumper. If a
it can be adjusted by
ck resistors. See “Output
” section.
th 03. The EN pin is provided on
th e MIC26603
tu
DD
the UVLO threshold.
The output of the MIC26603 may be turned off by
shorting the EN pin to ground. A connection on the
board provides easy access to the enable pin.
Ordering Information
Part Number Description
Getting Started
1. Connect an external supp
Apply the desired input voltag
terminals of the evaluation
attention to polarity and supp
may be place between the inp
terminal to the evaluation b
supply voltage is monitored
ammeter and/or power lead
the voltage supplied to the in
2. Connect the load to th
terminals. The load can be e
or active (as in an electronic
be placed between the load
Ensure that the output voltage i
V
OUT
terminal. V
OUT
can be
1.5V, 1.8V, 2.5V, 3.3V, or
different voltage is needed,
changing the feedba
Voltage
3. Enable e MIC266
ation boarde evalu . The output of th
rns on when V
exceeds
MIC26603YJL EV
6A HLL DC-DC Regulator Evaluation
Board
