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參數(shù)資料
| 型號(hào)： | AAT3171 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | High Current, High Efficiency Charge Pump with Auto-Timer |
| 中文描述： | 大電流，高效率電荷泵與自動(dòng)定時(shí)器 |
| 文件頁數(shù)： | 1/19頁 |
| 文件大小： | 382K |
| 代理商： | AAT3171 |
AAT3171
High Current, High Efficiency
Charge Pump with Auto-Timer
3171.2007.03.1.1
1
ChargePump
General Description
The AAT3171 is a high output current, high effi-
ciency, low noise, low profile charge pump DC/DC
converter. The device is ideal for multi-functional
LED photo-flash applications where solution cost,
size, and efficiency are critical.
The AAT3171 is capable of driving a regulated out-
put current up to 800mA. Output current levels can
be easily programmed in 16 steps through
AnalogicTech's Simple Serial Control (S
2
Cwire)
interface controlled by a single microcontroller
GPIO line. This allows smooth transitions and flexi-
ble adjustment of brightness in flash or other light-
ing modes. The maximum output current can also
be set with an external R
SET
resistor.
The tri-mode (1X/1.5X/2X) operation of the internal
charge pump offers excellent power efficiency
throughout the output current range for both flash
and movie modes. Combined with a low external
parts count (two 1μF flying capacitors and two small
bypass capacitors at V
IN
and OUT), the AAT3171 is
ideally suited for small battery-powered applications.
The AAT3171 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 pre-
vents excessive inrush current during start-up. The
shutdown feature disconnects the load from V
IN
and
reduces quiescent current to less than 1μA.
The AAT3171 is available in a Pb-free, thermally-
enhanced 12-pin 3x3mm TDFN package and is spec-
ified over the -40°C to +85°C temperature range.
Features
Up to 800mA Output Current
Tri-Mode 1X/1.5X/2X in Current Mode
16 Current Level Steps Set by S
2
Cwire
External R
SET
to Set Maximum Current
<1μA of Shutdown
Small Application Circuit
No Inductors
Automatic Soft Start
12-Pin TDFN 3x3mm Package
-40°C to +85°C Temperature Range
Applications
Camcorders
Camera Phones
Digital Still Cameras
PDAs and Notebook PCs
Smart Phones
Typical Application
AAT3171
EN/SET
C1+
C1-
C2+
C2+
OUT
FL
2.7V
to 5.5V
EN
Flash
LED
GND
1μF
C
IN
4.7μF
0.1μF
C
OUT
2.2μF
1μF
RSET
187K
CT
VIN
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