MAX8513EVKIT【PDF 1/35 页】EVAL KIT FOR MAX8513

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Sheet目录341

[1页]2页 3页 4页 5页

ATION

EVALU

AVAIL

19-3178; Rev 0; 2/04

KIT

ABLE

Wide-Input, High-Frequency, Triple-Output Supplies

with Voltage Monitor and Power-On Reset

General Description

The MAX8513/MAX8514 integrate a voltage-mode

PWM step-down DC-DC controller and two LDO con-

trollers, a voltage monitor, and a power-on reset for the

lowest-cost power-supply and monitoring solution for

xDSL modems, routers, gateways, and set-top boxes.

The DC-DC controller switching frequency can be set

Features

? Low-Cost DC-DC Controller with Two LDOs

? Wide Input Range: 4.5V to 28V

? 300kHz to 1.4MHz Adjustable Switching

Frequency

? Low Noise for High Data-Rate xDSL Applications

with an external resistor from 300kHz to 1.4MHz, to allow

for the optimization of cost, size, and efficiency. For noise-

sensitive applications, the DC-DC controller can also be

synchronized to an external clock, minimizing noise inter-

ference. Operation above 1.1MHz reduces noise for high

Synchronizable to External Clock

Adjustable Soft-Start

Lossless Adjustable Foldback Current Limit

Power-On Reset with 140ms Delay

data-rate xDSL applications. An adjustable soft-start and

adjustable foldback current limit provide reliable startup

and fault protection. The DC-DC controller output voltage

can be set externally to a voltage from 1.25V to 5.5V.

Current limiting is accomplished by inductor current sens-

ing for improved efficiency, or by an external sense resis-

tor for better accuracy.

? Adjustable Input Power-Fail Warning for Dying

Gasp

? Selectable Output-Voltage Sequencing or

Output-Voltage Tracking

Ordering Information

The MAX8513/MAX8514s ’ first LDO controller is

designed to provide a low-cost, high-current regulated

output from 0.8V to 5.5V using an N-channel MOSFET or

a low-current output using a low-cost NPN transistor. The

MAX8513’s second regulator can be used to generate

0.8V to 27V output with a low-cost PNP transistor. Both

PART

MAX8513 EEI

MAX8514 EEI

MAX8514AEI

TEMP RANGE

-40 ° C to +85 ° C

-40 ° C to +125 ° C

PIN-PACKAGE

28 QSOP

LDO regulators can operate either from the DC-DC con-

troller output or from a higher voltage derived with a fly-

back overwinding on the DC-DC converter inductor. The

MAX8514’s second LDO regulator is designed to pro-

vide a negative output with an NPN transistor.

A sequence input allows the outputs to either power up

together, or for the DC-DC regulator to power up first

and each LDO controller to power up in sequence. An

V IN

(4.5V TO 28V)

Functional Diagram

MAX8513

input power-fail output ( PFO ) is provided for input

power-fail warning, such as in dying-gasp applications.

A power-on reset circuit with a 140ms delay is also

included to indicate when all outputs have achieved

OFF

SYNC

STEP-

DOWN

CONTROLLER

V OUT1

(1.25V TO 5.5V)

regulation and stabilized.

Applications

xDSL, Cable, ISDN Modems, and Routers

OUTPUT

POWER-ON RESET

LDO

Wireless Routers

Set-Top Boxes

Automotive Dashboard Electronics

CONTROLLER 1

V OUT2

(0.8V TO V OUT1 )

Pin Configurations appear at end of data sheet.

INPUT POWER-

FAIL MONITOR

LDO

CONTROLLER 2

V OUT3

(0.8V TO 27V)

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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