AME, Inc.
1
AME7720 / 7721
Step-Up/Step-Down
60mA Regulated Charge Pump
n General Description
n Features
n Applications
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 -40OC to 85OC.
l Input Voltage Range:
5V Version: 2.7V to 5.5V
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 < 1µA (AME7720)
l Short Circuit Protection:Typ. 80mA
l Over Temperature Protection
l All AME’s Lead Free Product Meet RoHS
Standards
l Cellular Phone
l Digital Camera
l PDAs LCD display
l LED/Display Back Light Driver
l Smart Card Reader
l SIM Card Supply
l PCMCIA Card
l LCD Display
n Functional Block Diagram
AME7720
AME7721
Control EA
φ2 φ1
φ1 φ2
φ2φ1
C- C+V
IN
VOUT
GND
Control EA
φ2 φ1
φ1 φ2
φ2φ1
EN
C- C+V
IN
VOUT
GND