ADM8832ACPZ Analog Devices Inc, ADM8832ACPZ Datasheet

ADM8832ACPZ

Manufacturer Part Number

ADM8832ACPZ

Description

IC CHARGE PUMP REG TFT 20LFCSP

Manufacturer

Analog Devices Inc

Datasheet

1.ADM8832ACPZ-REEL.pdf (12 pages)

Specifications of ADM8832ACPZ

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-LFCSP

Primary Input Voltage

3.6V

No. Of Outputs

Output Voltage

15.3V

Output Current

50ÂµA

No. Of Pins

Operating Temperature Range

-40Â°C To +85Â°C

Msl

MSL 1 - Unlimited

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

For Use With

ADM8832EB-EVALZ - BOARD EVALUATION ADM8832 REG

Lead Free Status / RoHS Status

Lead free / RoHS Compliant, Lead free / RoHS Compliant

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FEATURES

3 output voltages (+5.1 V, +15.3 V, −10.2 V) from one 3 V

Power efficiency optimized for use with TFT in mobile

Low quiescent current

Low shutdown current (<1 µA)

Fast transient response

Shutdown function

Power saving during blanking period

Option to use external ldo

APPLICATIONS

Handheld instruments

TFT LCD panels

Cellular phones

GENERAL DESCRIPTION

The ADM8832 is a charge pump regulator used for color thin

film transistor (TFT) liquid crystal displays (LCD). 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 ADM8832 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

Rev. A

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.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

input supply

phones

mode where the current is highest. During blanking periods, the

ADM8832 switches to 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 seamlessly maintained when switching from scan-

ning mode to blanking mode or vice versa.

The ADM8832 power saving features include low power

shutdown and reduced quiescent current consumption during

the blanking periods. 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 ADM8832 is fabricated using CMOS technology for minimal

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

(lead frame chip scale package).

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

Tel: 781.329.4700

Fax: 781.326.8703

LDO_ON/

BLANK

SCAN/

CLKIN

SHDN

OFF

ADM8832

SHUTDOWN

OSCILLATOR

CONTROL

GENERATOR

CONTROL

LOGIC

FUNCTIONAL BLOCK DIAGRAM

TIMING

Charge Pump Regulator

VOLTAGE

TRIPLER

DISCHARGE

GND

for Color TFT Panel

2.2µF

Figure 1.

REGULATOR

DOUBLER

DOUBLE

VOLTAGE

INVERTER

VOLTAGE

TRIPLE

LDO

C1+

C1–

VOUT

LDO IN

+5VOUT

+5VIN

C2+

C2–

C3+

C3–

+15VOUT

C4+

C4–

–10VOUT

ADM8832

www.analog.com

1µF

2.2µF

+5.1V

+15.3V

–10.2V

Related parts for ADM8832ACPZ

ADM8832ACPZ 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 µA) Fast transient response Shutdown function Power ...

Page 2

ADM8832 TABLE OF CONTENTS Specifications..................................................................................... 3 Timing Specifications .................................................................. 4 Absolute Maximum Ratings............................................................ 5 Thermal Characteristics .............................................................. 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Typical Performance Characteristics ............................................. 7 REVISION HISTORY 4/04—Changed from Rev Rev. ...

Page 3

SPECIFICATIONS = −40°C to +85°C, unless otherwise noted; C1, C5, C6 2.2 µF, C2, C3, C4, C8 µF, CLKIN = 1 kHz 2 3 blanking mode. ...

Page 4

ADM8832 Parameter CLKIN Minimum Frequency Input Voltage Digital Input Current 1 Digital Input Capacitance 1 Guaranteed by design. Not 100% production tested. Specifications are subject to change without notice. TIMING SPECIFICATIONS ...

Page 5

ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameter Supply Voltage Input Voltage to Digital Inputs Output Short Circuit Duration to GND Output Voltage +5.1 V Output −10.2 V Output +15.3 V Output Operating Temperature Range ...

Page 6

ADM8832 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic Function 1 V Positive Supply Voltage Input. Connect this pin supply with a 2.2 µF decoupling capacitor VOUT Voltage Doubler Output. ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS 110 130 OUTPUT CURRENT (µA) Figure 3. LDO Efficiency in Blanking Mode with V 5.0752 5.0750 5.0748 5.0746 5.0744 5.0742 5.0740 5.0738 5.0736 5.0734 ...

Page 8

ADM8832 5.30 5.25 5.20 DEVICE 1 @ +85°C 5.15 DEVICE 1 @ +25°C 5.10 5.05 5.00 4.95 4.90 2.6 2.7 2.8 2.9 3.0 3.1 3.2 V (V) CC Figure 9. LDO Variation over Supply and Temperature 300 250 200 ICC ...

Page 9

TEK STOP: 500S/s 5 ACQS [ ] T +15V OUTPUT T 1 –10V OUTPUT T T 5VOUT 2 CH1 5.00V CH2 5.00V M10.0ms CH1 CH3 5.00V Figure 15. +15 V and −10 V Outputs at Power-Down (Unloaded) 20.1 20.0 19.9 ...

Page 10

ADM8832 THEORY OF OPERATION SCANNING AND BLANKING A TFT LCD panel is made bank of capacitors, each representing a pixel in the display. These capacitors store different levels of charge, depending on the amount of luminescence required ...

Page 11

... ADM8832ACP −40°C to +85°C ADM8832ACP-REEL −40°C to +85°C ADM8832ACP-REEL7 −40°C to +85°C 1 ADM8832ACPZ −40°C to +85°C 1 ADM8832ACPZ-REEL −40°C to +85°C 1 ADM8832ACPZ-REEL7 −40°C to +85° Pb-free part. 0.60 4.00 MAX BSC SQ 0.60 MAX TOP 3.75 VIEW BCS SQ 0 ...

Page 12

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