Microchip MIC23450 Bedienungsanleitung

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MIC23450 Evaluation Board

3MHz, PWM, 2A Triple Buck Regulator

with HyperLight Load

®

and Power Good

HyperLight Load is a registered trademark of Micrel, Inc.

MLF and MicroLeadFrame are registered trademark 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

February 4, 2013

Revision 1.0

General Description

This board allows the customer to evaluatethe

MIC23450, a fully-integrated, triple-output, 2A, 3MHz

switching regulator that featuresHyperLight Load

®

mode

andpower good (PG) output indicators. The MIC23450

is highly efficient throughout the output currentrange,

drawing just 23µA of quiescent currentfor each channel

in operation. The tiny 5mm x 5mm MLF

®

package saves

board space and requires few external components.The

MIC23450 provides ±2.5% output voltage accuracyand

each channelresponds typically in less than 10µs to a

load transient with as low as 5mVoutput voltage ripple.

Requirements

This board needs a single 40W bench power source,

adjustable from 2.7V to 5.5V. The loads can be either

active (electronic load) or passive (resistor), and must be

ableto dissipate 20W. It is ideal, but not essential,to

have an oscilloscope available to view the circuit

waveforms. The simplest testsrequiretwo voltage

meters to measure input and output voltage. Efficiency

measurementsfor a single channelrequiretwo voltage

meters and twoammetersto prevent errors caused by

measurement inaccuracies.

Precautions

There is no reverse input protection on this board. Be

careful when connecting the input source to make sure

correct polarity is observed.

Getting Started

1.Connect an external supply to the V

IN

(J1)

terminal and GND(J3).

With the output of the power supplydisabled, set its

voltage to the desired input test voltage(2.7V ≤V

IN

≤

5.5V). An ammeter may be placed between the input

supply and the V

IN

(J1) terminal. Be sure to monitor

the supply voltage at the V

IN

(J1) terminal, as the

ammeter and/or power lead resistance can reduce

the voltage supplied to the device.

2.Connecta loadto the V

OUT

terminals(J2, J5, J7)

and ground (J4, J6, J8) terminals.

The load can be either active passive (resistive) or

active (electronic load). Anammetermay be placed

between the loads and the output terminals. Make

sure the output voltage is monitored at V

OUT1,

V

OUT2

and

V

OUT3

(J2, J5 and J7) terminals. The board has

multiple2-pin connectors (JP1, JP2 and JP3) to

allow for output voltagemonitoringofV

OUT1

, V

OUT2

and V

OUT3

respectively.

3.Enable the Supply to MIC23450.

The MIC23450evaluation board has a pull-up

resistor to V

IN

for each channel. By default, each

output voltage isenabled when the input supply of

>2.7V is applied. Each channel 1, 2 or 3 can be

disabled by applyinga voltage below 0.4V to the EN

terminal J10, J12orJ14respectively.

4.Power Good.

The board provides apower good test point (J9,

J11, and J13) to monitorthe power good functionfor

each of the channels 1, 2, and 3 respectively. The

power good output goeshigh (V

OUT

) nominally62µs

after the output voltagereaches 90% of its nominal

voltage.

Ordering Information

Part NumberDescription

MIC23450-AAAYML EV

3MHz, PWM,

2ATriple Buck

Regulator Evaluation Board

Produktspezifikationen