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PDF ADM8832 Data sheet ( Hoja de datos )
| Número de pieza | ADM8832 | |
| Descripción | Charge Pump Regulator for Color TFT Panel | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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 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
Charge Pump Regulator
for Color TFT Panel
ADM8832
FUNCTIONAL BLOCK DIAGRAM
CLKIN
SCAN/
BLANK
LDO_ON/
OFF
SHDN
VCC
ADM8832
C5
2.2µF
VOLTAGE
DOUBLER
OSCILLATOR
CONTROL
LOGIC
LDO
VOLTAGE
REGULATOR
DOUBLE
TIMING
GENERATOR
TRIPLE
VOLTAGE
TRIPLER
VOLTAGE
SHUTDOWN DISCHARGE INVERTER
CONTROL
GND
Figure 1.
C1+
C1–
VOUT
LDO IN
+5VOUT
+5VIN
C2+
C2
C2– 1µF
C3+
C3
C3– 1µF
+15VOUT
C4+
C4
C4– 1µF
–10VOUT
C1
2.2µF
C6
2.2µF
+5.1V
C7
2.2µF
+15.3V
C8
1µF
–10.2V
C9
1µF
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).
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
1 page  
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
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
Power Dissipation
(Derate 33 mW/°C above 25°C)
Storage Temperature Range
ESD
Ratings
−0.3 V to +4.0 V
−0.3 V to +4.0 V
10 sec
−0.3 V to +6 V
−12 V to +0.3 V
−0.3 V to +17 V
−40°C to +85°C
3.55 W
−65°C to +150°C
Class I
ADM8832
THERMAL CHARACTERISTICS
20-Lead LFCSP:
θJA = 31°C/W
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. A | Page 5 of 12
5 Page 
OUTLINE DIMENSIONS
4.00
BSC SQ
0.60
MAX
PIN 1
INDICATOR
TOP
VIEW
3.75
BCS SQ
0.60
MAX
16 20
15 1
EXPOSED
PAD
(BOTTOM VIEW)
12° MAX
0.90
0.85
0.80
SEATING
PLANE
0.50
BSC
0.80 MAX
0.65 TYP
0.20
REF
0.75
0.55
0.35
11
10
0.05 MAX
0.02 NOM
COPLANARITY
0.08
5
6
0.30
0.23
0.18
COMPLIANT TO JEDEC STANDARDS MO-220-VGGD-1
Figure 20. 20-Lead Lead Frame Chip Scale Package [LFCSP]
4 mm × 4 mm Body
(CP-20)
Dimensions shown in millimeters
2.25
2.10 SQ
1.95
0.25 MIN
ADM8832
ORDERING GUIDE
Model
ADM8832ACP
ADM8832ACP-REEL
ADM8832ACP-REEL7
ADM8832ACPZ1
ADM8832ACPZ-REEL1
ADM8832ACPZ-REEL71
1 Z = Pb-free part.
Temperature Range
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
Package Description
Lead Frame Chip Scale Package
Lead Frame Chip Scale Package
Lead Frame Chip Scale Package
Lead Frame Chip Scale Package
Lead Frame Chip Scale Package
Lead Frame Chip Scale Package
Package Option
CP-20
CP-20
CP-20
CP-20
CP-20
CP-20
Rev. A | Page 11 of 12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ADM8832.PDF ] | |
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