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器件描述：High Current LED Flash Driver Charge Pump IC
器件厂商：ANALOGICTECH [Advanced Analogic Technologies]
厂商主页：http://www.analogictech.com/
文件大小：344.41KB
文件页数：14
PDF阅读：AAT3172.pdf (点击阅读器件资料)
摘要：
General Description
The AAT3172 is a high output current, high effi-
ciency, low noise, low profile charge pump DC/DC
converter, ideal for multi-function LED photo-flash
applications where solution cost, size, and efficien-
cy are critical.
The dual charge pump in the AAT3172 is capable
of delivering 600mA peak output current. Two cur-
rent-controlled paths are available for users of dual
flash LEDs that prefer current matching. Each LED
channel can be easily programmed in 32 steps with
a single GPIO output through the AS
2
Cwire?
(Advanced Simple Serial Control?) interface. This
allows smooth transitions and flexible adjustment
of brightness in flash or other lighting 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 1?F flying capacitors and
one small bypass capacitor at V
IN
and OUT), the
AAT3172 is ideally suited for small, battery-powered
applications.
The AAT3172 has a thermal management system to
protect the device in the event of a short-circuit con-
dition 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 quiescent current to less than 1.0?A.
The AAT3172 is available in the Pb-free, thermally-
enhanced, 12-pin 3x3 TDFN package.
Features
?V
IN
Range: 2.7V to 5.5V
? 600mA Peak Output Current
? Tri-Mode 1X/1.5X/2X in Current Mode
? Voltage Mode Operation: 1.5X, 100mA
? Dual Regulated Current Sinks
? Current Match Between Current Sinks
? 32 Current Steps Set by AS
2
Cwire
? 1?F Input, Output, and Flying Capacitors
? <1.0?A of Shutdown
? Small Application Circuit
? No Inductors
? Automatic Soft Start
? 12-Pin TDFN 3x3 Package
? -40°C to +85°C Temperature Range
Applications
? Camera Phones
? Digital Still Cameras (DSCs)
? PDAs and Notebook PCs
? Smart Phones
AAT3172
High Current LED Flash Driver Charge Pump IC
Typical Application
AAT3172
C
OUT
2.2?F
EN/SET
V
IN
C1+ C1- C2+ C2-
V
OUT
F1
F2
2.7V to 5.5V
EN/SET
Flash
LED 1
Flash
LED 2
GND
C
IN
4.7?F
C1
1?F
C2
1?F
3172.2005.11.1.1 1
ChargePump
?
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