Microchip MIC26603 Handleiding

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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 Lead Frame are registered trademarks of Amkor Technology, Inc.Micro

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 2011M9999-071511-A

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t current. The output voltage is a

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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 VIN ranging from 5.5V to 28V. When

ut for input

VIN< 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 VIN terminal

may damage the device. In addition, the maximum VIN

operating voltage of the MIC26603 evaluation board is

28V. Exceeding 29V on VIN could damage the device

capacitance and also makes (High VIN)/(Low VOUT).

ly to the VINterminal.

e to the VIN and ground

board, paying careful

ly voltage. An ammeter

dut supply and the VIN

oard. Ensure that the

at the VIN terminal. The

resistance can reduce

put.

e VOUT and ground

ither passive (resistive)

load). An ammeter can

and the VOUT 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.

th03. The EN pin is provided on

the 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

VOUTterminal. VOUTcan be

1.5V, 1.8V, 2.5V, 3.3V, or

different voltage is needed,

changing the feedba

Voltage

3. Enablee MIC266

ation boarde evalu. The output of th

rns on when Vexceeds

MIC26603YJL EV 6A HLL DC-DC Regulator Evaluation

Board

Product specificaties