ADM8830ARU Analog Devices Inc, ADM8830ARU Datasheet

ADM8830ARU

Manufacturer Part Number

ADM8830ARU

Description

IC CHARGE PUMP REG TFT 20TSSOP

Manufacturer

Analog Devices Inc

Datasheet

1.ADM8830ARU-REEL.pdf (8 pages)

Specifications of ADM8830ARU

Rohs Status

RoHS non-compliant

Applications

Converter, TFT, LCD

Voltage - Input

2.6 ~ 3.6 V

Number Of Outputs

Voltage - Output

-10.2V, 5.1V, 15.3V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

20-TSSOP

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GENERAL DESCRIPTION

The ADM8830 is a charge pump regulator used for color thin

film transistor (TFT) liquid crystal displays (LCDs). Using

charge pump technology, the device can be used to generate three

output voltages (+5.1 V ± 2%, +15.3 V, –10.2 V) from a single

3 V input supply. These outputs are then used to provide

supplies for the LCD controller (5.1 V) and the gate drives for

the transistors in the panel (+15.3 V and –10.2 V). Only a few

external capacitors are needed for the charge pumps. An efficient

low dropout voltage regulator also ensures that the power

efficiency is high and provides a low ripple 5.1 V output. This

LDO can be shut down and an external LDO used to regulate

the 5 V doubler output and drive the input to the charge pump

section, which generates the +15.3 V and –10.2 V outputs if so

required by the user.

The ADM8830 has an internal 100 kHz oscillator for use in

scanning mode, but the part must be clocked by an external clock

source in blanking (low current) mode.The internal oscillator is

used to clock the charge pumps during scanning mode where the

current is highest. During blanking periods, the ADM8830

switches to use an external, lower frequency clock.This allows the

user to vary the frequency and maximize power efficiency during

blanking periods.The tolerances on the output voltages are

REV. B

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

that may result from its use. No license is granted by implication or oth-

erwise under any patent or patent rights of Analog Devices.Trademarks

and registered trademarks are the property of their respective owners.

FEATURES

3 Output Voltages (+5.1 V, +15.3 V, –10.2 V) from

Power Efficiency Optimized for Use with TFT in

Low Quiescent Current

Low Shutdown Current (<1 A)

Fast Transient Response

Shutdown Function

Power Saving during Blanking Period

Option to Use External LDO

APPLICATIONS

Handheld Instruments

TFT LCD Panels

Cellular Phones

One 3 V Input Supply

Mobile Phones

seamlessly maintained when switching from scanning mode to

blanking mode or vice versa.

The ADM8830 has a number of power saving features, including

low power shutdown and reduced quiescent current consumption

during the blanking periods mentioned above. The 5.1 V output

consumes the most power, so power efficiency is also maximized

on this output with an oscillator enabling scheme (Green Idle™).

This effectively senses the load current that is flowing and turns

on the charge pump only when charge needs to be delivered to

the 5 V pump doubler output.

The ADM8830 is fabricated using CMOS technology for minimal

power consumption. The part is packaged in 20-lead LFCSP

and TSSOP packages.

One Technology Way, P .O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

SCAN/BLANK

LDO_ON/OFF

CLKIN

SHDN

Charge Pump Regulator

FUNCTIONAL BLOCK DIAGRAM

SHUTDOWN

GENERATOR

OSCILLATOR

CONTROL

ADM8830

CONTROL

TIMING

LOGIC

VOLTAGE

TRIPLER

for Color TFT Panel

DISCHARGE

GND

2.2F

DOUBLE

REGULATOR

TRIPLE

DOUBLER

VOLTAGE

INVERTER

LDO

VOLTAGE

ADM8830

C1+

C1–

C3+

C3–

C4+

C4–

VOUT

LDO IN

+5VOUT

+5VIN

C2+

C2–

+15VOUT

–10VOUT

www.analog.com

1F

2.2F

1F

2.2F

1F

+5.1V

+15.3V

–10.2V

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ADM8830ARU Summary of contents

Page 1

FEATURES 3 Output Voltages (+5.1 V, +15.3 V, –10.2 V) from One 3 V Input Supply Power Efficiency Optimized for Use with TFT in Mobile Phones Low Quiescent Current Low Shutdown Current (<1 A) Fast Transient Response Shutdown Function Power ...

Page 2

ADM8830–SPECIFICATIONS Parameter INPUT VOLTAGE SUPPLY CURRENT +5.1 V OUTPUT Output Voltage Output Current Power Efficiency Output Ripple Transient Response +15.3 V OUTPUT Output Voltage Output Current Output Ripple –10.2 V OUTPUT Output Voltage Output Current Output ...

Page 3

... ADM8830ARU –40ºC to +85ºC ADM8830ARU-REEL –40ºC to +85ºC ADM8830ARU-REEL7 –40ºC to +85ºC EVAL-ADM8830EB CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADM8830 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges ...

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ADM8830ARU Analog Devices Inc, ADM8830ARU Datasheet

ADM8830ARU

Specifications of ADM8830ARU

Related parts for ADM8830ARU

ADM8830ARU Summary of contents

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