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| AAT3112 Datasheet, PDF (1/16 Pages) Advanced Analogic Technologies – 500mA High Efficiency Charge Pump for White LED Flash Applications | |||
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AAT3112
500mA High Efficiency Charge Pump
for White LED Flash Applications
General Description
The AAT3112 is a member of AnalogicTech's Total
Power Management IC⢠(TPMICâ¢) family. It is a
dual voltage doubling charge pump that provides a
regulated output voltage. It operates with an input
voltage range of 2.7 to 5.0 volts. The device can
deliver a constant 200mA output load current and up
to 500mA of pulsed current. The 500mA peak cur-
rent capability of the AAT3112 makes it ideal for
white LED flash applications. A low external parts
count (two 1μF flying capacitors and two small
capacitors at VIN and VOUT) makes the AAT3112 ide-
ally suited for small battery-powered applications.
The AAT3112 has a thermal management system
to protect the device in the event of a short-circuit
condition at the output pin. Built-in soft-start circuit-
ry prevents excessive inrush current during start-
up. A high charge pump switching frequency
enables the use of very small external capacitors.
A low current shutdown feature disconnects the
load from VIN and reduces quiescent current to less
than 1μA. The AAT3112 is available in a Pb-free
16-pin 3x3mm QFN package and is rated over the
-40°C to +85°C temperature range.
Features
ChargePumpâ¢
⢠Input Voltage Range:
â AAT3112-5.0: 2.7V to 5.0V
â AAT3112-4.5: 2.7V to 4.5V
⢠Up to 500mA Peak Output Current
⢠200mA Continuous Output Current
⢠IQ <1μA in Shutdown
⢠Regulated 4.5V or 5.0V Output
⢠26μA of Quiescent Current
⢠Small Application Circuit
⢠Automatic Soft Start
⢠No Inductors
⢠Short-Circuit/Over-Temperature Protection
⢠16-Pin 3x3mm QFN Package
⢠Temperature Range: -40°C to +85°C
Applications
⢠General-Purpose High-Current Boost Supply
⢠White LED Backlighting
⢠White LED Photo Flash
Typical Application
VIN
CIN
Enable Light
Enable Flash
C1 = 1μF C2 = 1μF
C1+ C1- C2+ C2-
VIN
VOUT1
VOUT2
AAT3112
EN1
EN2
GND
C OUT
D1
D2
D3
D4
RB
3112.2007.01.1.5
1
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