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參數(shù)資料
| 型號(hào)： | AAT3140 |
| 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 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 498K |
| 代理商： | AAT3140 |
AAT3140
High Efficiency 1X/1.5X/2X Charge Pump
for White LED Applications
3140.2005.03.1.1
1
ChargePump
General Description
The AAT3140 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 appli-
cations. The device produces current levels up to
30mA on each of its four current source outputs to
drive various arrangements of LEDs from a 2.7V to
5.5V input. Outputs may be operated individually or in
parallel for driving higher-current LEDs. Alow external
parts count (two 1μF flying capacitors and two small
1μF capacitors at V
IN
and CP) make the AAT3140 ide-
ally suited for small battery-powered applications.
The AAT3140 is equipped with AnalogicTech’s unique
AutoBias technology which allows individual LEDs
to be powered either by charge pump or battery input,
determined internally and automatically to maximize
the power efficiency even with a large difference in
LED forward voltage.
AnalogicTech's Simple Serial Control (S
2
Cwire)
digital input is used to enable, disable, and set the
LED drive current with a 32-level logarithmic scale
LED brightness control. The AAT3140 has a thermal
management system to protect the device in the event
of a short-circuit condition at an output pin. Built-in
soft-start circuitry prevents excessive inrush current
during start-up. A high charge pump switching fre-
quency enables the use of very small external capac-
itors. In shutdown mode, the device disconnects the
load from V
IN
and reduces quiescent current to less
than 1μA. The AAT3140 is available in the very small
12-pin TSOPJW package.
Features
V
IN
Range: 2.7V to 5.5V
Tri-Mode 1X, 1.5X, and 2X Charge Pump for
Maximum Efficiency and V
F
Coverage
Drives Low-V
F
and High-V
F
Type LEDs
Up to 4, 30mA Outputs
32-Position Logarithmic Scale with Digital
Control
Low Noise Constant Frequency Operation
1MHz Switching Frequency
AutoBias Technology
Small Application Circuit
Regulated Output Current
Automatic Soft Start
No Inductors
I
Q
< 1μA in Shutdown
12-Pin TSOPJW Package
Applications
Color (RGB) Lighting
Programmable Current Sources
White LED Backlighting
White Photo Flash for DSCs
Typical Application
C
IN
1
μ
F
V
BATTERY
C
CP
1
μ
F
EN/SET
C1
1
μ
F
C2
1
μ
F
D3
D2
D1
VIN
CP
C1+
C1-
C2+
C2-
D1
D2
D3
D4
EN/SET
GND
AAT3140
D4
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| AAT3140_07 | 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 |
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| AAT3141_07 | 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 |
| AAT3141ITP-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 |
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