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.
Features
•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
• Cellular Phones
• Digital Cameras
• Handheld Electronics
• PDAs
• White LED Backlighting
• White LED Camera Flash
AAT3119
High Efficiency 2X Charge Pump
Typical Application
AAT3119
IN
GND
EN
OUT
C
OUTC
IN
1µF
1µF
1µF
C+ C-
C
FLY
Enable
V
IN
V
OUT
3119.2005.08.1.1 1
ChargePump
™