Rainbow-electronics MAX1748 User Manual download pdf

General Description

The MAX1748 triple-output DC-DC converter in a low-

profile TSSOP package provides the regulated voltages

required by active matrix, thin-film transistor (TFT) liquid

crystal displays (LCDs). One high-power DC-DC con-

verter and two low-power charge pumps convert the

+3.3V to +5V input supply voltage into three independent

output voltages.

The primary high-power DC-DC converter generates a

boosted output voltage (V

MAIN

) up to 13V that is regu-

lated within ±1%. The low-power BiCMOS control cir-

cuitry and the low on-resistance (0.35Ω) of the

integrated power MOSFET allows efficiency up to 93%.

The 1MHz current-mode PWM architecture provides

fast transient response and allows the use of ultra-small

inductors and ceramic capacitors.

The dual charge pumps independently regulate one

positive output (V

POS

) and one negative output (V

NEG

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.

The MAX1748 is available in the ultra-thin TSSOP pack-

age (1.1mm max height).

________________________Applications

TFT Active Matrix LCD Displays

Passive Matrix LCD Displays

PDAs

Digital Still Cameras

Camcorders

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)

MAX1748

Triple-Output TFT LCD DC-DC Converter

________________________________________________________________ Maxim Integrated Products 1

RDY TGND

PGND

SUPP

DRVP

SUPN

DRVN

SHDN

TOP VIEW

MAX1748

TSSOP

INTG

REF

GND

FBP

FBN

Pin Configuration

19-1740; Rev 0; 6/00

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.

Ordering Information

Typical Operating Circuit appears at end of data sheet.

16 TSSOP

PIN-PACKAGETEMP. RANGE

-40°C to +85°CMAX1748EUE

PART

1 2 3 4 5 6 ... 15 16

Summary of Contents

Page 1 - Ordering Information

General DescriptionThe MAX1748 triple-output DC-DC converter in a low-profile TSSOP package provides the regulated voltagesrequired by active matrix,

Page 2 - ELECTRICAL CHARACTERISTICS

MAX1748Triple-Output TFT LCD DC-DC Converter10 ______________________________________________________________________________________GNDPGNDR6CREF0.22

Page 3

MAX1748Triple-Output TFT LCD DC-DC Converter______________________________________________________________________________________ 11converter reaches

Page 4

MAX1748Triple-Output TFT LCD DC-DC ConverterThe MAX1748’s fast current-limit circuitry allows the useof soft-saturation inductors while still protecti

Page 5

MAX1748Triple-Output TFT LCD DC-DC Converter______________________________________________________________________________________ 13voltage by connec

Page 6 - = 3.3V, T

MAX1748Triple-Output TFT LCD DC-DC Converter14 ______________________________________________________________________________________CINTG 470pFCREF0.

Page 7 - Pin Description

MAX1748Triple-Output TFT LCD DC-DC Converter______________________________________________________________________________________ 15CREF 0.22µFCINTG4

Page 8 - Pin Description (continued)

MAX1748Triple-Output TFT LCD DC-DC ConverterMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Ma

Page 9 - Power-Up Sequencing

MAX1748Triple-Output TFT LCD DC-DC Converter2 _______________________________________________________________________________________ABSOLUTE MAXIMUM

Page 10

MAX1748Triple-Output TFT LCD DC-DC Converter_______________________________________________________________________________________ 3ELECTRICAL CHARAC

Page 11 - Design Procedure

MAX1748Triple-Output TFT LCD DC-DC Converter4 _______________________________________________________________________________________PARAMETER SYMBOL

Page 12 - Table 1. Component Suppliers

MAX1748Triple-Output TFT LCD DC-DC Converter_______________________________________________________________________________________ 59.849.909.889.869

Page 13 - Chip Information

MAX1748Triple-Output TFT LCD DC-DC Converter6 _______________________________________________________________________________________Typical Operating

Page 14

MAX1748Triple-Output TFT LCD DC-DC Converter_______________________________________________________________________________________ 7Typical Operating

Page 15 - Typical Operating Circuit

MAX1748Triple-Output TFT LCD DC-DC Converter8 _______________________________________________________________________________________Detailed Descript

Page 16 - Package Information

MAX1748Triple-Output TFT LCD DC-DC Converter_______________________________________________________________________________________ 9the soft-start pe

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Rainbow-electronics MAX1748 User Manual

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