AME, Inc.
AME7720 / 7721
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General Description
The AME7720 / 7721 is switched-capactitor voltage
doublers that delivers a regulated output. No external in-
ductor is required for operation. Using three small ca-
pacitors, the AME7720 / 7721 can deliver up to 60mA to
the voltage regulated output. The AME7720 / 7721 fea-
tures very low output pipple and high efficiency over a
large portion of its load range making this device ideal for
battery-powered applications. Furthermore, the combi-
nation of few external components and small package
size keeps the total converter board area to a minimum
in space restricted applications.
The AME7720 / 7721 contains a thermal management
circuit to protect the device under continuous output short
circuit conditions.
The AME7720 / 7721 is available in SOT-25 / SOT-26
package and is rated from -40
O
C to 85
O
C.
Step-Up/Step-Down
60mA Regulated Charge Pump
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Applications
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Cellular Phone
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Digital Camera
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PDAs LCD display
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LED/Display Back Light Driver
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Smart Card Reader
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SIM Card Supply
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PCMCIA Card
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LCD Display
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Functional Block Diagram
AME7720
V
IN
φ2
C-
C+
φ1
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Features
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Input Voltage Range:
5V Version: 2.7V to 5.5V
3.3V Version: 1.8V to 5.5V
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Accurate to with
±5%
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Output Current:
5V Version: 60mA with V
IN
>=3.0V
3.3V Version: 60mA with V
IN
>=2.2V
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1MH
Z
Switching Frequency
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Shutdown Mode < 1µA (AME7720)
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Short Circuit Protection:Typ. 80mA
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Over Temperature Protection
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All AME’ s Lead Free Product Meet RoHS
Standards
V
IN
EN
φ1
φ2
V
OUT
φ1
φ2
EA
Control
GND
AME7721
C-
C+
φ2
φ1
φ1
φ2
V
OUT
φ1
φ2
EA
Control
GND
1
AKM [ ASAHI KASEI MICROSYSTEMS ]
