AME, Inc.
Step-Up/Step-Down
AME7720 / 7721
60mA Regulated Charge Pump
nGeneral Description
nApplications
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
l Cellular Phone
lDigital Camera
l PDAs LCD display
l LED/Display Back Light Driver
lSmart Card Reader
lSIM Card Supply
lPCMCIA Card
lLCD Display
in space restricted applications.
nFunctional Block Diagram
The AME7720 / 7721 contains a thermal management
circuit to protect the device under continuous output short
AME7720
C-
C+
circuit conditions.
VIN
The AME7720 / 7721 is available in SOT-25 / SOT-26
package and is rated from -40OC to 85OC.
f 2
f1
f1
f 2
nFeatures
VOUT
l Input Voltage Range:
f1
Control
f 2
5V Version: 2.7V to 5.5V
EN
EA
3.3V Version: 1.8V to 5.5V
l Accurate to with ±5%
l Output Current:
5V Version: 60mA with VIN>=3.0V
3.3V Version: 60mA with VIN >=2.2V
l 1MHZ Switching Frequency
l Shutdown Mode < 1mA (AME7720)
l Short Circuit Protection:Typ. 80mA
l Over Temperature Protection
l All AME’ s Lead Free Product Meet RoHS
Standards
GND
AME7721
C-
C+
VIN
f2
f1
f 1
f2
VOUT
f1
Control
f2
EA
GND
1
AKM [ ASAHI KASEI MICROSYSTEMS ]
