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PDF ADM8830ARU-REEL Data sheet ( Hoja de datos )
| Número de pieza | ADM8830ARU-REEL | |
| Descripción | Charge Pump Regulator for Color TFT Panel | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADM8830ARU-REEL (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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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 A)
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 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
Charge Pump Regulator
for Color TFT Panel
ADM8830
FUNCTIONAL BLOCK DIAGRAM
CLKIN
SCAN/BLANK
LDO_ON/OFF
SHDN
VCC
ADM8830
C5
2.2F
VOLTAGE
DOUBLER
OSCILLATOR
CONTROL
LOGIC
LDO
VOLTAGE
REGULATOR
DOUBLE
TIMING
GENERATOR
TRIPLE
VOLTAGE
TRIPLER
SHUTDOWN
CONTROL
DISCHARGE
VOLTAGE
INVERTER
GND
C1+
C1–
C1
2.2F
VOUT
LDO IN
C6
2.2F
+5VOUT
+5VIN
C2+
C2
C2– 1F
C3+
C3
C3– 1F
+15VOUT
C4+
C4
C4– 1F
+5.1V
C7
2.2F
+15.3V
C8
1F
–10VOUT
–10.2V
C9
1F
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.
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.
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
© 2003 Analog Devices, Inc. All rights reserved.
1 page  
80
70
60
50
40
30
20
10
10 30 50 70 90 110 130 150 170 190
OUTPUT CURRENT – A
TPC 1. LDO Efficiency in Blanking
Mode with VCC = 3 V
Typical Performance Characteristics–ADM8830
5.0752
5.0750
5.0748
5.0746
5.0744
5.0742
5.0740
5.0738
5.0736
5.0734
100
1000
10000
BLANKING FREQUENCY – Hz
TPC 2. LDO Output Voltage (Unloaded)
vs. Blanking Mode Frequency
5.104
5.102
5.100
5.098
5.096
5.094
5.092
5.090
01
2
34 5
ILOAD – mA
6 78
TPC 3. LDO O/P Voltage vs. Load
Current in Scanning Mode, VCC = 3.3 V
85
84
83
82
81
80
79
78
01
2
34 5
6 78
OUTPUT CURRENT – mA
TPC 4. LDO Efficiency in Scanning
Mode with VCC = 3 V
100
90
80
70
60
246
8 10
OUTPUT CURRENT – A
TPC 5. +15 V/–10 V Efficiency vs. Output
Current in Blanking Mode, VCC = 3 V
100
90
80
70
60
50
40
0
20 40 60 80
OUTPUT CURRENT – A
100
TPC 6. +15 V/–10 V Efficiency vs. Output
Current in Scanning Mode, VCC = 3 V
5.30
5.25
5.20
5.15
DEVICE 1 @ +25C
5.10
DEVICE 1 @ +85C
5.05
DEVICE 1 @ –40C
5.00
4.95
4.90
2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
VCC – V
TPC 7. LDO Variation over Supply
and Temperature
300
250
200
ICC (SCAN)
150
100
ICC (BLANK)
50
0
2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
VCC – V
TPC 8. Supply Current vs. Voltage
VOUT
5V OUTPUT RIPPLE
VCC RIPPLE
TPC 9. Output Ripple on LDO
(5 V Output)
REV. B
–5–
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ADM8830ARU-REEL.PDF ] | |
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