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參數(shù)資料
| 型號(hào)： | AAT3157ITP-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 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(yè)數(shù)： | 1/11頁(yè) |
| 文件大?。?/td> | 302K |
| 代理商： | AAT3157ITP-T1 |
AAT3157
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
ChargePump
3157.2006.05.1.2
1
General Description
The AAT3157 is a low noise, constant frequency
charge pump DC/DC converter that uses a tri-
mode load switch (1X), fractional (1.5X), and dou-
bling (2X) conversion to maximize efficiency for
white LED applications. The AAT3157 is capable of
driving up to three channels of LEDs at 20mA per
channel from a 2.7V to 5.5V input. The current
sinks may be operated individually or in parallel for
driving higher current LEDs. A low external parts
count (two 1
μ
F flying capacitors and two small 1
μ
F
capacitors at IN and OUTCP) make this part ideal-
ly suited for small, battery-powered applications.
AnalogicTech's S
2
Cwire
(Simple Serial Control
)
serial digital input is used to enable, disable, and set
current for each LED with 16 settings down to 50
μ
A.
The low-current mode supply current can be as low
as 50
μ
A to save power.
Each output of the AAT3157 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 1
μ
A.
The AAT3157 is available in a Pb-free, space-sav-
ing 2.85x3.0mm 12-pin TSOPJW package.
Features
V
IN
Range: 2.7V to 5.5V
Fully Programmable Current with Single Wire
— 16 Current Levels
— Four Low Current Settings Down to 50μA
Low I
Q
(50μA) for Low Current Mode
Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and V
F
Coverage
Drives up to Three Channels of LEDs
No Inductors, Low Noise Operation
1MHz Constant Switching Frequency
Small Application Circuit
Built-In Thermal Protection
Automatic Soft Start
I
Q
<1μA in Shutdown
2.85x3.0mm TSOPJW-12 Package
Applications
Color (RGB) Lighting
Programmable Current Sinks
White LED Backlighting
White Photo Flash for Digital Still Cameras
Typical Application
2.7V to 5.5V
EN/SET
IN
EN/SET
C2+
C2-
C1+
C1-
OUTCP
D1
D2
D3
GND
AAT3157
D1
C1
1μF
C2
1μF
C
IN
1μF
C
OUT
1μF
D2
D3
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3158 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications |
| AAT3158ITP-T1 | 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT3159 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications |
| AAT3159ITO-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications |
| AAT3164 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:High Efficiency 1X/1.5X/2X Charge Pump for Six-Channel White LED Applications |
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