Rainbow-electronics MAX1885 Manual do Utilizador descarregar pdf (Página 1)

General Description

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

POS

) and one negative out-

put (V

NEG

). These low-power outputs use external

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).

Applications

TFT LCD Notebook Displays

TFT LCD Desktop Monitor Panels

Features

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

Regulator

Up to +13V Main High-Power Output

±1% Accurate

High Efficiency (91%)

♦ Dual Regulated Charge-Pump Outputs

(MAX1778/MAX1880/MAX1881/MAX1882 only)

Up to +40V Positive Charge-Pump Output

Up to -40V Negative Charge-Pump Output

♦ Low-Dropout 40mA Linear Regulator

(MAX1778/MAX1881/MAX1883/MAX1884 only)

Up to +15V LDO Input

♦ Optional Higher Current with External Transistor

♦ 2.7V to 5.5V Input Supply

♦ Internal Supply Sequencing and Soft-Start

♦ Power-Ready Output

♦ Adjustable Fault-Detection Latch

♦ Thermal Protection (+160°C)

♦ 0.1µA Shutdown Current

♦ 0.7mA IN Quiescent Current

♦ Ultra-Small External Components

♦ Thin TSSOP Package (1.1mm max height)

MAX1778/MAX1880–MAX1885

Quad-Output TFT LCD DC-DC

Converters with Buffer

________________________________________________________________ Maxim Integrated Products 1

19-1979; Rev 0a; 3/01

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX1778EUG -40°C to +85°C 24 TSSOP

MAX1880EUG -40°C to +85°C 24 TSSOP

MAX1881EUG -40°C to +85°C 24 TSSOP

MAX1882EUG -40°C to +85°C 24 TSSOP

MAX1883EUP -40°C to +85°C 20 TSSOP

MAX1884EUP -40°C to +85°C 20 TSSOP

MAX1885EUP -40°C to +85°C 20 TSSOP

Typical Operating Circuit appears at end of data sheet.

Pin Configurations and Selector Guide appear at end of

data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

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

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Página 1 - Converters with Buffer

General DescriptionThe MAX1778/MAX1880–MAX1885 multiple-output DC-DC converters provide the regulated voltagesrequired by active matrix thin-film tran

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer10 ____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer12 ____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer14 ____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer16 ____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer18 ____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer2 _____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer20 ____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer22 ____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer24 ____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer26 ____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer28 ____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer30 ____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer32 ____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer34 ____________________________________________________________________________

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the Typical Operating Characteristics. Set the resistivedivider to precharge BUFOUT, matching the buffer’soutput set voltage:These resistor values are

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer36 ____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with BufferMaxim cannot assume responsibility for use of any circuitry other than circuitr

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer4 _____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer6 _____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer8 _____________________________________________________________________________

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MAX1778/MAX1880–MAX1885Quad-Output TFT LCD DC-DC Converters with Buffer_______________________________________________________________________________

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