AAT3119 Datasheet, PDF (1/18 Pages) Advanced Analogic Technologies – 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
High Efficiency 2X Charge Pump
Features
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
• Cellular Phones
• Digital Cameras
• Handheld Electronics
• PDAs
• White LED Backlighting
• White LED Camera Flash
Typical Application
V_IN
C_IN
1μF
Enable
C_FLY
1μF
C+
IN
C-
OUT
AAT3119
EN
GND
C_OUT
1μF
V_OUT
3119.2007.02.1.2
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