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General Description

The MAX1553/MAX1554 drive white LEDs in series with

a constant current to provide efficient display backlight-

ing in cellular phones, PDAs, and other hand-held

devices. The step-up converter includes an internal

40V, low R

DSON

, N-channel MOSFET switch for high

efficiency and maximum battery life. The MAX1553 has

a current limit of 480mA for driving two to six white

LEDs, while the MAX1554 has a current limit of 970mA

for driving up to 10 white LEDs.

A single analog/PWM Dual Mode input provides two

simple means of brightness adjustment. A separate

enable input provides on/off control. Soft-start minimizes

inrush current during startup.

The MAX1553/MAX1554 are available in space-saving

8-pin TDFN 3mm x 3mm packages.

Applications

Cellular Phones

PDA, Palmtop, and Wireless Handhelds

Color Display Backlight

Features

♦ Constant-Current Regulation for Even LED

Illumination

♦ Internal 40V MOSFET Switch Capable of Driving

10 LEDs

♦ Small, Low-Profile External Components

♦ 2.7V to 5.5V Input Range

♦ Up to 88% Efficiency Driving 6 LEDs

♦ Up to 82% Efficiency Driving 9 LEDs

(20mA, V

= 3.6V)

♦ Analog or PWM Control of LED Intensity

♦ Optimized for Low Input Ripple

♦ Soft-Start to Minimize Inrush Current

♦ 3mm x 3mm 8-Pin TDFN Package

MAX1553/MAX1554

High-Efficiency, 40V Step-Up

Converters for 2 to 10 White LEDs

________________________________________________________________ Maxim Integrated Products 1

TOP VIEW

BRT

GND

5 FB

TDFN

3mm x 3mm

MAX1553

MAX1554

Pin Configuration

Ordering Information

OFF

BRT

GND

2.7V TO 5.5V

INPUT

OVEN

PWM

DC CONTROL

MAX1553

MAX1554

WHITE

LEDS

Typical Operating Circuit

19-2875; Rev 0; 6/03

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.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX1553ETA -40°C to +85°C 8 TDFN 3mm x 3mm

MAX1554ETA -40°C to +85°C 8 TDFN 3mm x 3mm

Dual Mode is a trademark of Maxim Integrated Products, Inc.

1 2 3 4 5 6 ... 10 11

Resumo do Conteúdo

Página 1 - High-Efficiency, 40V Step-Up

General DescriptionThe MAX1553/MAX1554 drive white LEDs in series witha constant current to provide efficient display backlight-ing in cellular phones

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MAX1553/MAX1554High-Efficiency, 40V Step-UpConverters for 2 to 10 White LEDs10 _______________________________________________________________________

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MAX1553/MAX1554High-Efficiency, 40V Step-UpConverters for 2 to 10 White LEDsMaxim cannot assume responsibility for use of any circuitry other than cir

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MAX1553/MAX1554High-Efficiency, 40V Step-UpConverters for 2 to 10 White LEDs2 ________________________________________________________________________

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MAX1553/MAX1554High-Efficiency, 40V Step-UpConverters for 2 to 10 White LEDs__________________________________________________________________________

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MAX1553/MAX1554High-Efficiency, 40V Step-UpConverters for 2 to 10 White LEDs4 ________________________________________________________________________

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MAX1553/MAX1554High-Efficiency, 40V Step-UpConverters for 2 to 10 White LEDs__________________________________________________________________________

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MAX1553/MAX1554High-Efficiency, 40V Step-UpConverters for 2 to 10 White LEDs6 ________________________________________________________________________

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MAX1553/MAX1554High-Efficiency, 40V Step-UpConverters for 2 to 10 White LEDs__________________________________________________________________________

Página 10

Adjusting the LED CurrentAdjusting the output current changes the brightness ofthe LEDs. The LED current is set by the voltage at BRT(VBRT) and the se

Página 11

MAX1553/MAX1554High-Efficiency, 40V Step-UpConverters for 2 to 10 White LEDs__________________________________________________________________________

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Rainbow-electronics MAX1554 Manual do Utilizador

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