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參數(shù)資料
| 型號(hào)： | AAT3169 |
| 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)： | 8/14頁 |
| 文件大?。?/td> | 434K |
| 代理商： | AAT3169 |
AAT3169
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
8
3169.2006.04.1.0
Functional Description
The AAT3169 is a tri-mode load switch (1X) and
high efficiency (1.5X or 2X) charge pump device
intended for white LED backlight applications. To
maximize power conversion efficiency, an internal
sensing circuit monitors the voltage required on
each constant current sink input and sets the load
switch and charge pump modes based on the input
battery voltage and the current sink input voltage.
As the battery discharges over time, the AAT3169
charge pump is enabled when any of the six current
sink inputs near dropout. The charge pump initially
starts in 1.5X mode. If the charge pump output
droops enough for any current source output to
become close to dropout, the charge pump will
automatically transition to 2X mode. The AAT3169
requires only four external components: two 1μF
ceramic capacitors for the charge pump flying
capacitors (C1 and C2), one 1μF ceramic input
capacitor (C
IN
), and one 0.33μF to 1μF ceramic
charge pump output capacitor (C
OUT
).
The six constant current sink inputs (D1 to D6) can
drive six individual LEDs with a maximum current
of 30mA nominal each. Unused sink inputs are
connected to V
OUT
, otherwise the part will operate
only in 2X charge pump mode. The AS
2
Cwire seri-
al interface enables the AAT3169 and sets the cur-
rent sink magnitudes. AS
2
Cwire addressing allows
independent control of two groups of current sink
input: D1~D5 and D6.
Constant Current Output Level Settings
The constant current sink levels for D1 to D6 are
set via the serial interface according to a logarith-
mic scale where each code is approximately 1.8dB
lower than the previous code. In this manner, LED
brightness appears linear with each increasing
code count. Because the inputs D1 to D6 are true
independent constant current sinks, the voltage
observed on any single given input will be deter-
mined by the actual forward voltage (V
F
) for the
LED being driven.
Functional Block Diagram
1X, 1.5X, 2X
Charge Pump
D/A
D/A
D/A
6 x 16 bit
ROM
AS
2
Cwire
Interface
Soft-Start
Control
1MHz
Oscillator
Voltage
Reference
VIN
EN/SET
GND
D4
D3
D2
D1
VOUT
C1+
C1- C2+
C2-
D/A
D5
D/A
6 x 16 bit
ROM
D6
D/A
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3169_08 | 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 |
| AAT3169IFO-T1 | 制造商:Skyworks Solutions Inc 功能描述:Voltage Regulators - Switching Regulators 1X/1.5X/2X Charge Pump For WLED Apps 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT3169ISN-T1 | 制造商:Skyworks Solutions Inc 功能描述:LED Lighting Drivers High Eff 1x/1.5x/2x Mode w/ PWM Control |
| AAT3169ITO-T1 | 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT3169IWO-T1 | 制造商:Skyworks Solutions Inc 功能描述:Voltage Regulators - Switching Regulators 1x/1.5x/2x H Efficie Chrg Pump,WH LED App 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
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