MAX1882EUG Maxim Integrated, MAX1882EUG Datasheet

MAX1882EUG

Manufacturer Part Number

MAX1882EUG

Description

LCD Drivers Quad-Output TFT LCD DC-DC Converter with Buffer

Manufacturer

Maxim Integrated

Datasheet

1.MAX1882EUG.pdf (39 pages)

Specifications of MAX1882EUG

Maximum Operating Temperature

+ 85 C

Minimum Operating Temperature

- 40 C

Package / Case

TSSOP-24

Mounting Style

SMD/SMT

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The MAX1778/MAX1880–MAX1885 multiple-output

DC-DC converters provide the regulated voltages

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

crystal displays (LCD) in a low-profile TSSOP package.

One high-power step-up converter and two low-power

charge pumps convert the 2.7V to 5.5V input voltage

into three independent output voltages. A built-in linear

regulator and VCOM buffer complete the power-supply

requirements.

The main step-up converter accurately generates an

externally set output voltage up to 13V that can supply

the display’s row/column drivers. The converter’s high

switching frequency and current-mode PWM architec-

ture provide fast transient response and allow the use

of small low-profile inductors and ceramic capacitors.

The low-power BiCMOS control circuitry and internal

14V switch (0.35Ω N-channel MOSFET) enable efficien-

cies up to 91%.

The dual low-power charge pumps (MAX1778/

MAX1880/MAX1881/MAX1882 only) independently reg-

ulate one positive output (V

put (V

diode and capacitor stages (as many stages as

required) to regulate output voltages up to +40V and

-40V. A unique control scheme minimizes output ripple

as well as capacitor sizes for both charge pumps.

A resistor-programmable, 40mA, low-dropout linear

regulator (MAX1778/MAX1881/MAX1883/MAX1884

only) provides preregulation or postregulation for any of

the supplies. For higher current applications, an exter-

nal transistor can be added. Additionally, the VCOM

buffer provides a high current output that is ideal for

driving the capacitive backplane of TFT LCD panels.

The VCOM buffer’s output voltage is preset with an

internal 50% resistive-divider or can be externally

adjusted for other voltages.

The MAX1778/MAX1880–MAX1885 are protected

against output undervoltage and thermal overload con-

ditions by a latched fault detection circuit that shuts

down the device. All devices are available in the ultra-

thin TSSOP package (1.1mm max height).

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

NEG

TFT LCD Notebook Displays

TFT LCD Desktop Monitor Panels

). These low-power outputs use external

General Description

POS

) and one negative out-

Applications

Quad-Output TFT LCD DC-DC

o 500kHz/1MHz Current-Mode PWM Step-Up

o Dual Regulated Charge-Pump Outputs

o Low-Dropout 40mA Linear Regulator

o Optional Higher Current with External Transistor

o 2.7V to 5.5V Input Supply

o Internal Supply Sequencing and Soft-Start

o Power-Ready Output

o Adjustable Fault-Detection Latch

o Thermal Protection (+160°C)

o 0.1µA Shutdown Current

o 0.7mA IN Quiescent Current

o Ultra-Small External Components

o Thin TSSOP Package (1.1mm max height)

Typical Operating Circuit appears at end of data sheet.

Pin Configurations and Selector Guide appear at end of

data sheet.

Converters with Buffer

+ Denotes a lead(Pb)-free/RoHS-compliant package.

/V denotes an automotive qualified part.

MAX1778EUG

MAX1778EUG+

MAX1880EUG

MAX1880EUG/V+

MAX1881EUG

MAX1882EUG

MAX1883EUP

MAX1884EUP

MAX1885EUP

Regulator

(MAX1778/MAX1880–MAX1882 only)

(MAX1778/MAX1881/MAX1883/MAX1884 only)

Up to +13V Main High-Power Output

±1% Accurate

High Efficiency (91%)

Up to +40V Positive Charge-Pump Output

Up to -40V Negative Charge-Pump Output

Up to +15V LDO Input

PART

MAX1880–MAX1885

-40°C to +85°C

TEMP RANGE

Ordering Information

MAX1778/

19-1979; Rev 2; 10/12

PIN-PACKAGE

24 TSSOP

20 TSSOP

Features

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