Rainbow-electronics MAX1747 Manual do Utilizador descarregar pdf

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.

General Description

The MAX1747 triple charge-pump DC-DC converter

provides the regulated voltages required by active

matrix thin-film transistor (TFT) liquid-crystal displays

(LCDs) in a low-profile TSSOP package. One high-

power and two low-power charge pumps convert the

+2.7V to +4.5V input supply voltage into three indepen-

dent output voltages.

The primary high-power charge pump generates an

output voltage (V

OUT

) between 4.5V and 5.5V that is

regulated within ±1%. The low-power BiCMOS control

circuitry and the low on-resistance (R

) power

MOSFETs maximize efficiency. The adjustable switch-

ing frequency (200kHz to 2MHz) provides fast transient

response and allows the use of small low-profile ceram-

ic capacitors.

The dual low-power charge pumps independently regu-

late one positive output (V

POS

) and one negative output

NEG

). These additional outputs use external diode

and capacitor multiplier stages (as many stages as

required) to regulate output voltages up to +35V and

-35V.

The constant switching frequency and a proprietary

regulation algorithm minimize output ripple and capaci-

tor sizes for all three charge pumps. The MAX1747 is

available in the ultra-thin TSSOP package (1.1mm max

height).

MAX1747

Triple Charge-Pump TFT LCD

DC-DC Converter

________________________________________________________________ Maxim Integrated Products 1

OUT

CXP

SUPM

CXNFB

RDY

TGND

TOP VIEW

PGND

SUPP

DRVP

SUPNREF

GND

INTG

DRVN

SHDNFBN

FBP

MAX1747

TSSOP

Pin Configuration

19-1788; Rev 0; 10/00

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX1747EUP -40°C to +85°C 20 TSSOP

Features

♦ Adjustable Outputs

Up to +5.5V Main High-Power Output

Up to +35V Positive Charge-Pump Output

Down to -35V Negative Charge-Pump Output

♦ 200kHz to 2MHz Adjustable Switching Frequency

♦ +2.7V to +4.5V Input Supply

♦ Internal Power MOSFETs

♦ 0.1µA Shutdown Current

♦ Internal Soft-Start

♦ Power-Ready Output

♦ Internal Supply Sequencing

♦ Fast Transient Response

♦ Ultra-Thin Solution (No Inductors)

♦ Thin TSSOP Package (1.1mm max)

Applications

TFT Active-Matrix LCDs

Passive-Matrix Displays

Personal Digital Assistants (PDAs)

SUPN

DRVP

FBP

PGND

DRVN

GND

TGND

MAX1747

SHDN

RDY

FBN

REF

INPUT

TO µC

SUPM

MAIN OUTPUT

POSITIVE

OUTPUT

INTG

CXP

CXN

OUT

SUPP

NEGATIVE

OUTPUT

Typical Operating Circuit

EVALUATION KIT

AVAILABLE

1 2 3 4 5 6 ... 12 13

Resumo do Conteúdo

Página 1 - DC-DC Converter

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.General Des

Página 2

MAX1747Triple Charge-Pump TFT LCD DC-DC Converter10 ______________________________________________________________________________________Negative Cha

Página 3

MAX1747Triple Charge-Pump TFT LCD DC-DC Converter______________________________________________________________________________________ 11in the Typic

Página 4

MAX1747Triple Charge-Pump TFT LCD DC-DC Converter12 ______________________________________________________________________________________Efficiency ≅

Página 5

MAX1747Triple Charge-Pump TFT LCD DC-DC ConverterMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in

Página 6

MAX1747Triple Charge-Pump TFT LCD DC-DC Converter2 _______________________________________________________________________________________ABSOLUTE MAX

Página 7

MAX1747Triple Charge-Pump TFT LCD DC-DC Converter_______________________________________________________________________________________ 3ELECTRICAL C

Página 8

MAX1747Triple Charge-Pump TFT LCD DC-DC Converter4 _______________________________________________________________________________________PARAMETER SY

Página 9

MAX1747Triple Charge-Pump TFT LCD DC-DC Converter_______________________________________________________________________________________ 5PARAMETER SY

Página 10

MAX1747Triple Charge-Pump TFT LCD DC-DC Converter6 _______________________________________________________________________________________Typical Oper

Página 11

MAX1747Triple Charge-Pump TFT LCD DC-DC Converter_______________________________________________________________________________________ 7410221628343

Página 12

MAX1747Triple Charge-Pump TFT LCD DC-DC Converter8 _______________________________________________________________________________________Detailed Des

Página 13 - Chip Information

MAX1747Triple Charge-Pump TFT LCD DC-DC Converter_______________________________________________________________________________________ 9(VPOS) and a

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Rainbow-electronics MAX1747 Manual do Utilizador

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