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參數(shù)資料
| 型號(hào)： | AAT3167 |
| 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)： | 8/14頁(yè) |
| 文件大?。?/td> | 416K |
| 代理商： | AAT3167 |
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AAT3167
High Efficiency 1X/1.5X/2X Charge
Pump for White LED Applications
8
3167.2006.05.1.3
Functional Description
The AAT3167 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 AAT3167
charge pump is enabled when any of the five cur-
rent sink inputs near dropout. The charge pump ini-
tially starts in 1.5X mode. If the charge pump out-
put droops enough for any current source output to
become close to dropout, the charge pump will
automatically transition to 2X mode. The AAT3167
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 five constant current sink inputs (D1 to D5) can
drive five individual LEDs with a maximum current
of 27mA nominal each. Unused sink inputs should
be connected to OUTCP, otherwise the part will
operate only in 2X charge pump mode. The
AS
2
Cwire serial interface enables the AAT3167 and
sets the current sink magnitudes. AS
2
Cwire
addressing allows independent control of two
groups of current sink input: D1~D4 and D5.
Constant Current Output Level Settings
The constant current sink levels for D1 to D5 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 D5 are true
Functional Block Diagram
D/A
D/A
D/A
AS
2
Cwire
Interface
Voltage
Reference
6 x 16 Bit
ROM
6 x 16 Bit
ROM
1MHz
Oscillator
Soft-Start
Control
1X, 1.5X, 2X
Charge Pump
IN
EN/SET
GND
D4
D3
D2
D1
OUTCP
C1+
C1- C2+
C2-
D/A
D5
D/A
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| AAT3167ISN-T1 | High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3167_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 |
| AAT3167IFO-T1 | 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 |
| AAT3167ISN-T1 | 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 |
| AAT3169 | 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 |
| 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 |
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