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參數(shù)資料
| 型號： | AAT3194 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | High Efficiency 1.5X Fractional Charge Pump For White LED Applications |
| 中文描述： | 高效率1.5倍分數(shù)電荷泵白光LED應用 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大小： | 284K |
| 代理商： | AAT3194 |
AAT3194
High Efficiency 1.5X Fractional Charge
Pump For White LED Applications
Typical Application
C
IN
1μF
V
BATTERY
C
OUT
1μF
EN/SET
C1
1μF
C2
1μF
D4
D3
D2
D1
IN
OUT
C1+
C1-
C2+
C2-
D1
D2
D3
D4
EN/SET
GND
AAT3194
3194.2006.09.1.0
1
ChargePump
General Description
The AAT3194 is a low noise, constant frequency
charge pump DC/DC converters that use fractional
(1.5X) conversion to increase efficiency in white
LED applications. The devices can be used to pro-
duce current levels up to 20mA for each output
from a 2.7V to 5.5V input. A low external parts
count (two 1μF flying capacitors and two small
bypass capacitors at IN and OUT) makes these
devices ideally suited for small, battery-powered
applications.
AnalogicTech’s Simple Serial Control (S
2
Cwire)
interface is used to enable, disable, and set the
LED drive current for 32-level logarithmic scale LED
brightness control. The AAT3194 has a thermal
management system for protection in the event of a
short-circuit condition on any of the output pins.
Built-in soft-start circuitry prevents excessive inrush
current during start-up. A high switching frequency
enables the use of small external capacitors. A low-
current shutdown feature disconnects the load from
V
IN
and reduces quiescent current to less than 1μA.
The AAT3194 is available in a Pb-free 12-pin
TSOPJW package.
Features
V
IN
Range: 2.7V to 5.5V
20mA Full-Scale Current
Simple Serial Control (S
2
Cwire) Interface
— 32-Position Logarithmic Scale with Digital
Control
Low Noise Constant Frequency Operation
33% Less Input Current Than Doubler
Charge Pump
High Accuracy Brightness Matching
Small Application Circuit
Regulated Output Current
Automatic Soft Start
No Inductors
600kHz Switching Frequency
I
Q
<1μA in Shutdown
Temperature Range: -40°C to 85°C
12-Pin TSOPJW Package
Applications
Programmable Current Source
White LED Backlighting
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3194_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:High Efficiency 1.5X Fractional Charge Pump For White LED Applications |
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| AAT3195 | 制造商:AAT 制造商全稱:AAT 功能描述:4-Channel Charge-Pump LED Driver |
| AAT3195IJQ-1 | 制造商:AAT 制造商全稱:AAT 功能描述:4-Channel Charge-Pump LED Driver |
| AAT3195IJQ-1-T1 | 制造商:Skyworks Solutions Inc 功能描述:IC LED DRVR BACKLIGHT 10SC70JW 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
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