Rainbow-electronics MAX1779 Manual de usuario descargar pdf

General Description

The MAX1779 triple-output DC-DC converter provides

highly efficient regulated voltages required by small

active matrix, thin-film transistor (TFT) liquid-crystal dis-

plays (LCDs). One high-power DC-DC converter and

two low-power charge pumps convert the +2.7V to

+5.5V input supply voltage into three independent out-

put 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 (1Ω) of the integrated

power MOSFET allows efficiency up to 91%. The

250kHz current-mode pulse-width modulation (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 MAX1779 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

♦ 250kHz Current-Mode PWM Boost Regulator

Up to +13V Main High-Power Output

±1% Accuracy

High Efficiency (91%)

♦ 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

♦ 0.5mA Quiescent Current

♦ Internal Soft-Start

♦ Power-Ready Output

♦ Ultra-Small External Components

♦ Thin TSSOP Package (1.1mm max)

MAX1779

Low-Power Triple-Output TFT LCD DC-DC

Converter

________________________________________________________________ Maxim Integrated Products 1

RDY TGND

PGND

SUPP

DRVP

SUPN

DRVN

SHDN

TOP VIEW

MAX1779

TSSOP

INTG

REF

GND

FBP

FBN

Pin Configuration

19-1795; Rev 0; 11/00

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

Typical Operating Circuit appears at end of data sheet.

16 TSSOP

PIN-PACKAGETEMP. RANGE

-40°C to +85°CMAX1779EUE

PART

1 2 3 4 5 6 ... 17 18

Converter 1

Indice de contenidos

Pagina 1 - Converter

General DescriptionThe MAX1779 triple-output DC-DC converter provideshighly efficient regulated voltages required by smallactive matrix, thin-film tra

Pagina 2

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter10 ______________________________________________________________________________________(VC3+ VS

Pagina 3

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter______________________________________________________________________________________ 11GNDPGNDR

Pagina 4

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter12 ______________________________________________________________________________________1.125V),

Pagina 5

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter______________________________________________________________________________________ 13where RL

Pagina 6

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter14 ______________________________________________________________________________________nated by

Pagina 7

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter______________________________________________________________________________________ 15CREF 0.2

Pagina 8

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter16 ______________________________________________________________________________________VIN = +3

Pagina 9

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter______________________________________________________________________________________ 17INSHDNRD

Pagina 10

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverterMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodie

Pagina 11

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter2 _______________________________________________________________________________________ABSOLUTE

Pagina 12

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter_______________________________________________________________________________________ 3ELECTRIC

Pagina 13

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter4 _______________________________________________________________________________________PARAMETE

Pagina 14

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter_______________________________________________________________________________________ 54.984.99

Pagina 15

4.0µs/divRIPPLE WAVEFORMSMAX1779-14A. VMAIN = 5V, IMAIN = 100mA, 10mV/divB. VNEG = -8V, INEG = 1mA, 5mV/divC. VPOS = 12V, IPOS = 1mA, 5mV/div, FIGURE

Pagina 16

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter_______________________________________________________________________________________ 7100µs/di

Pagina 17

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter8 _______________________________________________________________________________________Pin Desc

Pagina 18

MAX1779Low-Power Triple-Output TFT LCD DC-DCConverter_______________________________________________________________________________________ 9Detailed

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