High Efficiency 2X Charge Pump
General Description
The AAT3119 is a general purpose high efficiency
voltage regulated charge pump IC that can produce
output current levels up to 150mA. As a voltage
regulated output device, it may be used for general
voltage boost applications or to power white, RGB,
or flash type LEDs from a 2.7V to 5.5V input.
The voltage doubling charge pump architecture of
the AAT3119 provides for a low external part count;
just three small ceramic capacitors are needed.
This makes the AAT3119 ideally suited for small
battery-powered applications. This device oper-
ates from a fixed high frequency 1.2MHz oscillator
which enables the use of very small external
capacitors, one 1μF flying capacitor, and two 1μF
bypass capacitors at IN and OUT.
The AAT3119 has built-in soft-start circuitry which
prevents excessive inrush current from the source
supply during startup. A low-current shutdown fea-
ture disconnects the load from V
IN
and reduces
quiescent current to less than 1.0μA when the
device is disabled. The AAT3119 is available in a
Pb-free, 8-pin SC70JW package and is rated over
the -40°C to +85°C temperature range.
AAT3119
Features
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ChargePump
™
V
IN
Range: 2.7V to 5.5V
150mA of Output Current
— Peak Current up to 250mA
Regulated Output Voltage
1.2MHz Switching Frequency
Low Noise Constant Frequency Operation
<1.0μA of Shutdown Current
Automatic Soft Start
Small Application Circuit
Inductorless Boost
8-Pin SC70JW Package
-40°C to +85°C Temperature Range
Applications
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Cellular Phones
Digital Cameras
Handheld Electronics
PDAs
White LED Backlighting
White LED Camera Flash
Typical Application
C
FLY
1μF
C+
V
IN
C
IN
1μF
IN
C-
OUT
C
OUT
1μF
V
OUT
AAT3119
Enable
EN
GND
3119.2007.02.1.2
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