Charge Pump Products
Analog Devices Applications Bulletin
March 2003
CONTENTS
Compact, High Efficiency Charge Pumps
Selection Guide . . . . . . . . . . . . . . . 1
nalog Devices’ portfolio of charge pumps offers designers many benefits for mobile and other
applications. Their key features include low power dissipation, very small packages, and power
efficiency ratings up to 99%. They require a minimum number of external components, resulting
in reduced board space and cost. Package dimensions are as small as 2.9 mm 2.75 mm.
ADM8839 +5 V, +15 V, –15 V
Charge Pump Regulator for
Color TFT Panel . . . . . . . . . . . . . . . 2
A
ADM8840 +5 V, +15 V, –15 V
Charge Pump Regulator and COM
Driver for Color TFT Panel. . . . . . . 3
ADM8830 +5.1 V, +15.3 V, –10.2 V
Charge Pump Regulator
for Color TFT Panel . . . . . . . . . . . . 4
ADM660/ADM8660
High Current CMOS
Switched Capacitor
Voltage Converters . . . . . . . . . . . . 5
ADM8828/ADM8829
Switched Capacitor Voltage
Inverters with Shutdown . . . . . . . . 6
Charge Pump Selection Guide
a
Part
Number
Input
Voltage
(V)
Output
Voltage(s) (V)
Output Current(s)
Efficiency
(%)
Package Type
ADM660
1.5 to 7
–VIN or 2 VIN
100 mA
80
DIP/SOIC/TSSOP 5
ADM8660
1.5 to 7
–VIN
100 mA
80
DIP/SOIC/TSSOP 5
ADM8828
1.5 to 5.5
–VIN
25 mA
99
6-Lead SOT-23
6
ADM8829
1.5 to 5.5
–VIN
25 mA
99
6-Lead SOT-23
6
ADM8830
2.6 to 3.6
+5.1/+15.3/–10.2 8 mA/100 µA/–100 µA 80
20-Lead LFCSP
4
ADM8839
2.7 to 4.2
+5/+15/–15
8 mA/150 µA/–150 µA 82
20-Lead LFCSP
2
ADM8840
2.7 to 3.6
+5/+15/–15
8 mA/150 µA/–150 µA 70
32-Lead LFCSP
3
ADP3605
3 to 6
–3
120 mA
—
SOIC/TSSOP
See Website
ADP3607
3 to 5
+5
50 mA
—
SOIC/TSSOP
See Website
ADP3610
3 to 3.6
2 VIN
320 mA
—
16-Lead TSSOP
See Website
Visit our website for samples, data sheets, and additional product information.
www.analog.com/ChargePump
Page
2
ADM8839 Charge Pump Regulator for Color TFT Panel (+5 V ± 2%, +15 V, –15 V)
he ADM8839 is ideal for TFT (thin film transistor) LCDs (liquid crystal displays). The device generates three voltages (+5 V ± 2%, +15 V,
and –15 V) from a single 2.7 V to 4.2 V supply—for use with li-ion or NiMH/NiCd batteries. These voltages provide supplies to the
LCD controller (+5 V ± 2%) and the gate drives for the transistors in the panel (+15 V and –15 V). Few external capacitors are
required, minimizing board space and cost. An efficient, low dropout voltage regulator ensures that the power efficiency is high and provides
low noise output.
T
The ADM8839 consumes less than 5 µA in shutdown. Power efficiency is maximized on the 5 V output with an oscillator enabling scheme
(Green Idle™). Power sequencing ensures that the –15 V supply powers up before the +15 V. The ADM8839 is fabricated using CMOS technology
for minimal power consumption and is packaged in a 20-lead LFCSP (lead frame chip scale package) with a tiny 4 mm 4 mm footprint.
ADM8839 5V EFFICIENCY VS. LOAD CURRENT
84
AD
RO
RY
TE
ME
CE
NS
O
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N
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BIS
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ADM
8839
4.2V
3.6V
3.6V
2.7V
FOLDS BACK
UNDER SCREEN
LCD
CON
TRO
LLER
FLEXIBLE PCB
Li-Ion
BATTERY
NiMH/NiCd
BATTERY
APPLICATIONS
•
•
•
•
PDAs
Hand-held instruments
TFT LCD panels
Cellular phones
Power Efficiency = 82%
20-Lead LFCSP—4 mm 4 mm
Key Features
• 3 output voltages (+5 V ± 2%, +15 V, –15 V)
from one 2.7 V to 4.2 V input supply
• Low quiescent current
• Power efficiency optimized for use with
TFT in mobile applications (PEFF = 82%)
• Small package footprint: 4 mm 4 mm
a
• Low shutdown current: <5 µA
• Minimal external components
Visit our website for samples, data sheets, and additional product information.
www.analog.com/ChargePump
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(CHIP-ON-GLASS)
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ADM8839
4mm 4mm
ADM8839
O
E
A
A
O
H
O
R
R
N
O
O
C
PO
R
TI
M
SOURCE DRIVER IC
(CHIP-ON-GLASS)
N
N
N
8
N
A
C
LA
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A
7
D
4
5
6
LOAD CURRENT – mA
A
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83
3
ADM8840 Charge Pump Regulator and COM Driver for Color TFT Panel (+5 V ± 2%, +15 V, –15 V)
he ADM8840 features a common line (COM) driver in a single-chip solution for TFT LCDs. The device provides an LCD controller
and grayscale DAC supply voltage of 5.0 V ± 2% and two gate drive voltages of ±15 V. The COM driver voltage alternates the
polarity of the common line voltage every line or every frame on the display to prevent screen burn occurring over time. The
ADM8840 is powered by a single 2.7 V to 3.6 V supply.
T
The ADM8840 receives the COM clock from the controller with a frequency as high as 10 kHz and allows programmable conditioning
of its amplitude and center voltage through the use of on-board DACs. The ADM8840 is fabricated using CMOS technology for minimal
power consumption. The part comes in a 32-pin LFCSP package with a 5 mm x 5 mm footprint.
R(7:0)
RO
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CHARGE
PUMPS
D
N
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–15 V
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DIGITAL CAMERAS
GATE DRIVER
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TO
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W
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LCD
CONTROLLER
ADM8840
PDAs
8-BIT
DACS
COM_IN
COM_OUT
1s
1s
90%
COM DRIVER
10%
TFT PANEL
GATE DRIVER IC
(CHIP-ON-GLASS)
MENU
1
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SOURCE DRIVER IC
(CHIP-ON-GLASS)
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LCD CO
NTRO
9 wxyz
LLER
ADM88
40
FOLDS BACK
UNDER SCREEN
#
CELLULAR PHONES
FLEXIBLE PCB
32-Lead LFCSP—5 mm 5 mm
APPLICATIONS
•
•
•
•
Digital cameras
Hand-held instruments
TFT LCD panels
Cellular phones
Key Features
• One-chip, integrated COM driver and charge pump
• Low quiescent current
• Programmable COM driver to prevent screen burn
• Low shutdown current: <5 µA
• 3 output voltages (5.0 V ± 2%, 15.0 V, –15.0 V)
from one 2.7 V to 3.6 V input supply
• Small package footprint: 5 mm 5 mm
• Minimal number of external components
• Power efficiency optimized for use with TFT in
mobile applications (PEFF = 70%)
a
Visit our website for samples, data sheets, and additional product information.
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TFT
PANEL
4
ADM8830 Charge Pump Regulator for Color TFT Panel (+5.1 V ± 2%, +15.3 V ± 4%, –10.2 V ± 4%)
he ADM8830 is ideal for TFT (thin film transistor) LCDs (liquid crystal displays). The device generates three voltages (+5.1 V ± 2%,
+15.3 V ± 4%, and –10.2 V ± 4%) from a single 2.6 V to 3.6 V supply. These voltages provide supplies to the LCD controller
(+5.1 V ± 2%) and the gate drives for the transistors in the panel (+15.3 V and –10.2 V). Few external capacitors are required,
minimizing board space and cost. An efficient low dropout voltage regulator ensures the power efficiency is high and provides a low
noise output. A 100 kHz internal oscillator is used to clock the charge pumps during scanning mode, when 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.
T
The ADM8830 consumes less than 1 µA in shutdown. Power efficiency is maximized on the 5.1 V output with an oscillator enabling
(Green Idle) scheme. Power sequencing ensures that the –10.2 V supply powers up before the +15.3 V supply. The ADM8830 is fabricated
using CMOS technology for minimal power consumption. The part is packaged in a 20-lead LFCSP (lead frame chip scale package)
with a tiny 4 mm 4 mm footprint.
Power Efficiency = 80%
20-Lead LFCSP—4 mm 4 mm
APPLICATIONS
• Hand-held instruments
• TFT LCD panels
• Cellular phones
Key Features
• 3 voltages (5.1 V ± 2%, 15.3 V ± 4%, –10.2 V ± 4%)
from one 2.6 V to 3.6 V supply
• Shutdown function
• Power efficiency optimized for use with TFT in mobile
applications (PEFF = 80%)
• Small package footprint: 4 mm 4 mm
• Low quiescent current
• Power saving during blanking period
• Minimal number of external components
• Low shutdown current (<1 µA)
• Fast transient response
Visit our website for samples, data sheets, and additional product information.
www.analog.com/ChargePump
a
5
ADM660/ADM8660 High Current CMOS Switched Capacitor Voltage Converters
he ADM660/ADM8660 invert the input voltage, producing VOUT = –VIN. The inverting scheme is ideal for generating a negative rail
in a single-supply system. Only two small external capacitors are needed for the charge pump. Output currents up to 50 mA with
greater than 90% efficiency are achievable. A frequency control (FC) input pin is used to select either 25 kHz or 120 kHz charge
pump operation, optimizing the capacitor sizes.
T
For applications that demand a higher voltage, the ADM660 can be used to double the input voltage, VOUT = 2 VIN. Output voltages
of 14 V maximum are attainable. In shutdown mode, the ADM660/ADM8660 consume 300 nA of current. The ADM660 is a pin compatible
upgrade for the MAX660, MAX665, MAX1044, ICL7660, and LTC1046. The ADM660/ADM8660 are available in 8-lead DIP and narrow
body SOIC packages. The ADM660 is also available in a 16-lead TSSOP package.
+1.5V TO +7V
INPUT
ADM660
ADM660
OPTIONAL
EXTERNAL
CLOCK
V+ 8
1 FC
2 CAP+ OSC 7
+
LV 6
3 GND
C1
10F
4 CAP– OUT 5
C2
+ 10F
1 FC
V+ 8
OPTIONAL
+
EXTERNAL
C2 CLOCK
10F
2 CAP+ OSC 7
+2.5V TO +7V
INPUT C1 +
NEGATIVE
OUTPUT
–1.5V TO –7V
10F
ADM660 VOLTAGE INVERTER CONFIGURATION
3 GND
+1.5V TO +7V
INPUT
POSITIVE
OUTPUT
+5V TO +14V
LV 6
4 CAP– OUT 5
ADM8660
+
C1
10F
ADM660 VOLTAGE DOUBLER CONFIGURATION
1 FC
V+ 8
2 CAP+
SD 7
3 GND
LV 6
LOW = ON
HIGH = SHUTDOWN
4 CAP– OUT 5
C2
+ 10F
NEGATIVE
OUTPUT
–1.5V TO –7V
ADM8660 VOLTAGE INVERTER WITH SHUTDOWN
APPLICATIONS
•
•
•
•
ADM660/ADM8660 EFFICIENCY VS. LOAD CURRENT
Hand-held instruments
Portable computers
Remote data acquisition
Op amp power supplies
100
EFFICIENCY – %
80
THE
ADM
660
COM
IS A
PATI
PIN
BLE
UPG
FOR
RAD
THE
E
MAX
MAX
660,
665,
M
ICL7
AX10
660,
44,
AND
LTC1
046
60
40
20
0
0
20
40
60
LOAD CURRENT – mA
80
100
Key Features
• ADM660 is a pin compatible upgrade for the MAX660,
MAX665, MAX1044, ICL7660, and LTC1046
• 2.2 µF or 10 µF capacitors
• ADM660 inverts or doubles input supply voltage
• 1.5 V to 7 V supply
• ADM8660 inverts input supply voltage
• Low power CMOS: 600 µA quiescent current
• 100 mA output current
• Selectable charge pump frequency (25 kHz/120 kHz)
• Shutdown function (ADM8660)
• Available in 16-lead TSSOP package
a
• Only 0.3 V drop at 30 mA load
Visit our website for samples, data sheets, and additional product information.
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ADM8828/ADM8829 Switched Capacitor Voltage Inverters with Shutdown
he ADM8828/ADM8829 is a charge pump voltage inverter that generates a negative supply from a positive input.
Input voltages ranging from +1.5 V to +5.5 V can be inverted into a –1.5 V to –5.5 V output supply. This inverting
scheme is ideal for generating a negative rail in single-power supply systems. Only two small external capacitors are
needed. Output currents up to 25 mA with greater than 99% efficiency are achievable. The ADM8828 also features a low
power shutdown (SHDN) pin that can be used to disable the device and reduce the quiescent current to 20 nA. The ADM8828
and ADM8829 are available in a 6-lead SOT-23 package and are pin compatible with the MAX828 and MAX829.
T
NEGATIVE
OUTPUT
–1.5V TO –5.5V
+1.5V TO +5.5V
INPUT
C1
1F
ADM8828
+
1 OUT
CAP+ 6
2 IN
SHDN 5
LOW = ON
HIGH = SHUTDOWN
NEGATIVE
OUTPUT
–1.5V TO –5.5V
3 CAP– GND 4
+1.5V TO +5.5V
INPUT
C1
1F
ADM8829
1 OUT
CAP+ 6
2 IN
+
NC 5
3 CAP– GND 4
+
+
C2
1F
C2
1F
ADM8829 VOLTAGE INVERTER
ADM8828 VOLTAGE INVERTER WITH SHUTDOWN
APPLICATIONS
•
•
•
•
•
•
Hand-held instruments
LCD panels
Cellular phones
PDAs
Remote data acquisition
Op amp power supplies
Worldwide
Headquarters
One Technology Way
P.O. Box 9106
Norwood, MA
02062-9106 U.S.A.
Tel: 781.329.4700,
(1.800.262.5643,
U.S.A. only)
Fax: 781.326.8703
Analog Devices, Inc.
Europe
c/o Analog Devices SA
17–19, rue Georges Besse
Parc de Haute
Technologie d’Antony
F-92182
Antony Cedex, France
Tel: 33.1.46.74.45.00
Fax: 33.1.46.74.45.01
Analog Devices, Inc.
Japan Headquarters
New Pier Takeshiba
South Tower Building
1-16-1 Kaigan,
Minato-ku, Tokyo
105-6891, Japan
Tel: 813.5402.8210
Fax: 813.5402.1063
Analog Devices, Inc.
Southeast Asia
Headquarters
4501 Nat West Tower
Times Square
1 Matheson Street
Causeway Bay
Hong Kong, PRC
Tel: 852.2.506.9336
Fax: 852.2.506.4755
Key Features
• Pin compatible with the MAX828 and MAX829
• Require only 2 capacitors
• Invert input supply voltage
• 1 µF capacitors
• 99% voltage conversion efficiency
• 1.5 V to 5.5 V input range
• 18 output resistance in SOT-23 package
• 600 mA quiescent current
• High output current
• 20 nA shutdown current (ADM8828)
• Shutdown function
© 2003 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective companies.
Printed in the U.S.A.
G03616-7.5-3/03(0)
www.analog.com/ChargePump