MAX1748 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1748

Triple-Output TFT-LCD DC-DC Converters

Maxim Integrated 

19-3430; Rev 0; 10/04

EVAALVUAAILTAIOBNLEKIT

Triple-Output TFT-LCD

DC-DC Converters

General Description

The MAX1748/MAX8726 triple-output DC-DC converters

in a low-profile TSSOP package provide the regulated

voltages required by active-matrix, thin-film transistor

(TFT) liquid-crystal displays (LCDs). One high-power

DC-DC converter and two low-power charge pumps

convert the +3.3V to +5V input supply voltage into three

independent output voltages.

The primary 1MHz DC-DC converter generates a boost-

ed output voltage (VMAIN) up to 13V using ultra-small

inductors and ceramic capacitors. The low-power

BiCMOS control circuitry and the low on-resistance

(0.35Ω) of the integrated power MOSFET allows effi-

ciency up to 93%.

The dual charge pumps independently regulate one

positive output (VPOS) and one negative output (VNEG).

These low-power outputs use external diode and

capacitor stages (as many stages as required) to regu-

late output voltages up to +40V and down to -40V. A

proprietary regulation algorithm minimizes output rip-

ple, as well as capacitor sizes for both charge pumps.

For both the MAX1748 and MAX8726, the supply

sequence is VMAIN first, VNEG next, and finally VPOS.

The MAX1748 soft-starts each supply as soon as the

previous supply finishes. The MAX8726 adds a delay

between the startups of VMAIN and VNEG and also

between VNEG and VPOS.

The MAX1748/MAX8726 are available in the ultra-thin

TSSOP package (1.1mm max height).

Applications

TFT Active-Matrix LCD Displays

Passive-Matrix LCD Displays

PDAs

Digital Still Cameras

Camcorders

Typical Operating Circuit appears at end of data sheet.

Features

♦ Three Integrated DC-DC Converters

♦ 1MHz Current-Mode PWM Boost Regulator

Up to +13V Main High-Power Output

±1% Accuracy

High Efficiency (93%)

♦ Dual Charge-Pump Outputs

Up to +40V Positive Charge-Pump Output

Down to -40V Negative Charge-Pump Output

♦ Internal Supply Sequencing

♦ Internal Power MOSFETs

♦ +2.7V to +5.5V Input Supply

♦ 0.1µA Shutdown Current

♦ 0.6mA Quiescent Current

♦ Internal Soft-Start

♦ Power-Ready Output

♦ Ultra-Small External Components

♦ Thin TSSOP Package (1.1mm max)

PART

MAX1748EUE

MAX8726EUE

Ordering Information

TEMP RANGE

-40°C to +85°C

-40°C to +85°C

PIN-PACKAGE

16 TSSOP

16 TSSOP

Pin Configuration

TOP VIEW

RDY 1

FB 2

INTG 3

IN 4

GND 5

REF 6

FBP 7

FBN 8

MAX1748

MAX8726

16 TGND

15 LX

14 PGND

13 SUPP

12 DRVP

11 SUPN

10 DRVN

9 SHDN

TSSOP

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

________________________________________________________________ Maxim Integrated Products 1

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

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