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參數(shù)資料
| 型號(hào)： | AAT3152 |
| 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(yīng)用 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大小： | 325K |
| 代理商： | AAT3152 |
AAT3152
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
8
3152.2005.08.1.2
Functional Block Diagram
1X, 1.5X and 2X
Charge Pump
D/A
D/A
D/A
D/A
6 x 16 bit
ROM
6 x 16 bit
ROM
S
2
Cwire
Interface
Soft-Start
Control
1MHz
Oscillator
Voltage
Reference
VIN
EN/SET
GND
D4
D3
D2
D1
VOUT
C1+
C1- C2+
C2-
Functional Description
The AAT3152 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 AAT3152
charge pump is enabled when any of the four cur-
rent sink inputs near dropout. The charge pump ini-
tially starts in 1.5X mode. If the charge pump out-
put drops enough for any current source output to
become close to dropout, the charge pump will
automatically transition to 2X mode. The AAT3152
requires only four external components: two 1μF
ceramic capacitors for the charge pump flying
capacitors (C
1
and C
2
), one 1μF ceramic input
capacitor (C
IN
), and one 0.33μF to 1μF ceramic
charge pump output capacitor (C
OUT
).
The four constant current sink inputs (D1 to D4)
can drive four individual LEDs with a maximum cur-
rent of 20mAeach. The unused sink inputs must be
connected to V
OUT
, otherwise the part will operate
only in 2X charge pump mode. The S
2
Cwire serial
interface enables the AAT3152 and sets the cur-
rent sink magnitudes. S
2
Cwire addressing allows
independent control of two groups of current sink
input: D1-D3 and D4.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| AAT3153ISN-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 |
| AAT3155 | 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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