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參數(shù)資料
| 型號： | AAT3169ISN-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications |
| 中文描述： | 高效率1x/1.5x/2x電荷泵白光LED應(yīng)用 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大?。?/td> | 441K |
| 代理商： | AAT3169ISN-T1 |
General Description
The AAT3169 is a low noise, constant frequency
charge pump DC/DC converter that uses a tri-mode
load switch (1X), fractional (1.5X), and doubling
(2X) conversion to maximize efficiency for white
LED applications. The AAT3169 is capable of driv-
ing six LEDs for a total of 180mA from a 2.7V to
5.5V input. The current sinks may be operated indi-
vidually or in parallel for driving higher current LEDs.
Alow external parts count (two 1μF flying capacitors
and two small 1μF capacitors at IN and OUTCP)
make this part ideally suited for small, battery-pow-
ered applications.
AnalogicTech's AS
2
Cwire (Advanced Simple Serial
Control) serial digital input is used to enable, dis-
able, and set current for each LED with a 16-level
logarithmic scale plus four low-current settings down
to 115μA. For optimized efficiency, low-current set-
tings require only 65μA of housekeeping current.
Each output of the AAT3169 is equipped with built-
in protection for output short-circuit and auto-dis-
able for load short-circuit conditions. Built-in soft-
start circuitry prevents excessive inrush current
during start-up. Alow-current shutdown feature dis-
connects the load from the input and reduces qui-
escent current to less than 1μA.
The AAT3169 is available in a Pb-free, space-sav-
ing, thermally-enhanced 16-pin 4x4mm QFN pack-
age or a low-profile 14-pin 3x3mm STDFN pack-
age and is rated over the -40°C to +85°C tempera-
ture range.
Features
V
IN
Range: 2.7V to 5.5V
Fully Programmable Current with Single Wire
— 16-Step Logarithmic Scale
— 15/20/30mA Max Current
— Four Low-Current Settings Down to 115μA
— Low I
Q
(65μA) for Single-Channel, Low-
Current Mode
Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and V
F
Coverage
Drives Up to Six LEDs
Individual Main-Sub (5-1) Group Control
No Inductors, Low Noise Operation
1MHz Constant Switching Frequency
Small Application Circuit
Built-In Thermal Protection
Built-In Auto-Disable for Open Circuit
Automatic Soft Start
I
Q
<1μA in Shutdown
Thermally-Enhanced STDFN33-14 or
QFN44-16 Package
Applications
Color (RGB) Lighting
Programmable Current Sink
Transmissive Displays
White LED Backlighting
White Photo Flash for Digital Still Cameras
AAT3169
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
Typical Application
C1
1μF
C2
1μF
D1
Main
Sub
D2
D3
D4
D5
C
OUT
1μF
EN/SET
2.7V to 5.5V
IN
EN/SET
C1+
C1-
C2+
C2-
OUTCP
D1
D2
D3
D4
D5
D6
AAT3169
D6
C
IN
1μF
3169.2006.08.1.2
1
ChargePump
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