MAX1582ETC+T【PDF 1/10 页】IC LED DRVR WHITE BCKLGT 12-TQFN

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Sheet目录340

[1页]2页 3页 4页 5页

19-2783; Rev 2; 8/05

ATION

AILABL

EVALU E

KIT

High-Efficiency Step-Up Converters

for White LED Main and Subdisplay Backlighting

General Description

The MAX1582/MAX1582Y drive up to six white LEDs in

series with a constant current to provide display back-

lighting for two (main and sub-) displays in cell phones

and other handheld devices. This configuration elimi-

nates the need for ballast resistors and expensive fac-

tory calibration. The proprietary dual-output, step-up

pulse-width modulation (PWM) converter includes a low

R DSON n-channel MOSFET switch for high efficiency and

maximum battery life.

The MAX1582/MAX1582Y utilize 1MHz current-mode

PWM control to allow small input and output capacitors

and a small inductor, while minimizing ripple on the input

supply and avoiding interference to sensitive circuitry in

the equipment. Integrated overvoltage protection (27V

for the MAX1582 and 18V for the MAX1582Y) eliminates

the need for an external zener diode to protect the IC

from open circuit. Flexible dimming control utilizes either

an analog control signal or direct digital PWM control

without external RC filtering. This also increases dimming

accuracy at low brightness levels. The PWM dimming

signal can be any frequency from 200Hz to 200kHz. Soft-

start eliminates inrush current during startup.

Features

? Accurate Current Regulation for Uniform

Illumination

? Lights Up Two LED Sections for Main and

Subdisplays

? Up to 84% Efficiency

? Internal High-Power, 30V MOSFET

? Low 15mV P-P Input Ripple

? Flexible Dimming Control

Analog DAC Controlled

Direct-Digital PWM (No RC Required)

from 200Hz to 200kHz

? Overvoltage Protection to Eliminate Zener Diode

? Constant 1MHz PWM Operation

? Low-Profile Inductor and Capacitors

? Soft-Start Eliminates Inrush Current

? 2.6V to 5.5V Input

? 0.01μA (typ) Shutdown Current

? Tiny UCSP (2.1mm ? 2.1mm ? 0.61mm) and Thin

QFN (4mm ? 4mm) Packages

Ordering Information

The MAX1582/MAX1582Y are available in tiny 4 ? 4

chip-scale (UCSP?) and 12-pin thin QFN packages.

Applications

Cell Phones with One or Two Displays

Smart Phones, Palmtops, and Wireless

Handhelds

PART

MAX1582 EBE-T

MAX1582EBE+T

MAX1582ETC

MAX1582ETC+

TEMP RANGE PIN-PACKAGE

-40 ° C to +85 ° C 16 UCSP-16

-40 ° C to +85 ° C 12 Thin QFN-EP*

TOP

MARK

1582EBE

AACE

Other Handheld Devices with Dual Displays

Typical Application Circuit

* EP = Exposed paddle.

+ Denotes lead-free package.

UCSP is a trademark of Maxim Integrated Products, Inc.

Ordering Information continued at end of data sheet.

INPUT

2.6V TO 5.5V

22 μ H

TOP VIEW

Pin Configurations

2.2 μ F

V+

ANALOG OR

DIRECT PWM

DIMMING

CTRL

MAX1582

OUT1

PGND

0.1 μ F

2 TO 4 LEDS

MAIN

DISPLAY

V+

CTRL

MAX1582

MAX1582Y

OUT2

EN2

EN1

OUT2

EN2

COMP

2 TO 3 LEDS

SUB-

DISPLAY

4mm x 4mm

0.022 μ F

GND

7.5 Ω

THIN QFN

A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.

Pin Configurations continued at end of data sheet.

________________________________________________________________ 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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