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參數(shù)資料
| 型號： | AAT3151IFP-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應用 |
| 文件頁數(shù)： | 1/15頁 |
| 文件大?。?/td> | 431K |
| 代理商： | AAT3151IFP-T1 |
AAT3151
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
3151.2007.03.1.10
1
ChargePump
General Description
The AAT3151 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 AAT3151 is capable of
driving four white LEDs at a total of 120mA from a
2.7V to 5.5V input. The current sinks may be oper-
ated individually or in parallel for driving higher-cur-
rent LEDs. A low external parts count (two 1μF fly-
ing capacitors and two small 1μF capacitors at V
IN
and V
OUT
) makes the AAT3151 ideally suited for
small battery-powered applications.
AnalogicTech's AS
2
Cwire (Advanced Simple
Serial Control) serial digital input is used to
enable, disable, and set current for each LED with
a 16-level logarithmic scale plus four low-current
settings down to 50μA for optimized efficiency, with
a low housekeeping current of only 50μA.
The charge pump output of the AAT3151 is
equipped with built-in protection for V
OUT
. Each
current sink input has short-circuit and auto-disable
to guard against LED failure conditions. Built-in
soft-start circuitry prevents excessive inrush cur-
rent during start-up. A low-current shutdown fea-
ture disconnects the load from V
IN
and reduces
quiescent current to less than 1μA.
The AAT3151 is available in a Pb-free, space-saving,
thermally-enhanced, 12-pin 3x3mm TDFN package,
or in the lower-profile STDFN package.
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 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 Four Channels of LEDs
Individual Main/Sub-Group Control
No Inductors, Low Noise Operation
1MHz Constant Switching Frequency
Small Application Circuit
Built-In Thermal Protection
Built-In Auto-Disable for Short-Circuit
Automatic Soft Start
I
Q
<1μA in Shutdown
TDFN33-12 or STDFN33-12 Package
Applications
Color (RGB) Lighting
Programmable Current Sinks
White LED Backlighting
White Photo Flash for Digital Still Cameras
Typical Application
C1
1
μ
F
C2
1
μ
F
D1
D2
D3
D4
SUB
MAIN
C
OUT
1
μ
F
C
IN
1
μ
F
2.7V to 5.5V
EN/SET
VIN
EN/SET
C1+
C1-
C2+
C2-
VOUT
D1
D2
D3
D4
GND
AAT3151
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3151IWP-T1 | 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT3152 | 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 |
| AAT3152_05 | 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 |
| AAT3152IWP-T1 | 制造商:SKYWORKS SOLUTIONS INC 功能描述:1X,1.5X,2X WLED CHPMP 12TDFN TR 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT3153 | 制造商:AAT 制造商全稱:AAT 功能描述:High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications |
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