AAT3170_08 Datasheet, PDF (1/15 Pages) Advanced Analogic Technologies – High Current LED Flash Driver Charge Pump IC

ChargePump^TM
PRODUCT DATASHEET
AAT3170
High Current LED Flash Driver Charge Pump IC
General Description
The AAT3170 is a high output current, high efficiency,
low noise, low profile charge pump DC/DC converter,
ideal for multi-function LED photo-flash applications
where solution cost, size, and efficiency are critical.
The dual charge pump in the AAT3170 is capable of
delivering 600mA output current. Two current-controlled
paths are available for users of dual flash LEDs that pre-
fer current matching. Each LED channel can be easily
programmed in 32 steps with a single GPIO output
through the AS²Cwire™ (Advanced Simple Serial
Control™) interface. This allows smooth transitions and
flexible adjustment of brightness in flash or other light-
ing modes.
The tri-mode (1X/1.5X/2X) operation of the internal
charge pump offers excellent power efficiency for both
flash and movie modes. Combined with a low external
parts count (two 1μF flying capacitors and one small
bypass capacitor at V_IN and OUT), the AAT3170 is ideally
suited for small, battery-powered applications.
The AAT3170 has a thermal management system to pro-
tect the device in the event of a short-circuit condition at
the output pin. Built-in soft-start circuitry prevents
excessive inrush current during start-up. The shutdown
feature disconnects the load from V_IN and reduces quies-
cent current to less than 1.0μA.
The AAT3170 is available in the Pb-free, thermally-
enhanced, 12-pin 3x3mm TDFN package.
Features
• V_IN Range: 2.7V to 5.5V
• 600mA Output Current
• Tri-Mode 1X/1.5X/2X in Current Mode
• Voltage Mode Operation: 1.5X, 200mA
• Dual Regulated Current Sinks
• Current Match Between Current Sinks
• 32 Current Steps Set by AS²Cwire
• 1μF Input, Output, and Flying Capacitors
• <1.0μA of Shutdown
• Small Application Circuit
• No Inductors
• Automatic Soft Start
• 12-Pin TDFN 3x3mm Package
• -40°C to +85°C Temperature Range
Applications
• Camera Phones
• Digital Still Cameras (DSCs)
• PDAs and Notebook PCs
• Smart Phones
Typical Application
C1
C2
1μF
1μF
2.7V to 5.5V
C1+ C1- C2+ C2-
VIN
VOUT
CIN
4.7μF
AAT 3170
COUT
2.2μF
Flash
LED 1
EN/SET
CT
0.1μF
EN/SET
F1
CT
F2
GND
Flash
LED 2
3170.2007.11.1.2
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