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參數(shù)資料
| 型號： | AAT3164IRN-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | High Efficiency 1X/1.5X/2X Charge Pump for Six-Channel White LED Applications |
| 中文描述： | 高效率1x/1.5x/2x充電泵為六通道白光LED應用 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 397K |
| 代理商： | AAT3164IRN-T1 |
AAT3164
High Efficiency 1X/1.5X/2X Charge Pump for
Six-Channel White LED Applications
8
3164.2006.07.1.0
Functional Block Diagram
1x, 1.5x and 2x
Charge Pump
D/A
D/A
D/A
S
2
Cwire
Interface
Soft-Start
Control
1MHz
Oscillator
Voltage
Reference
IN
EN/SET
GND
D4
D3
D2
D1
OUT
C1+
C1- C2+
C2-
D/A
D5
D/A
6 x 16 bit
ROM
D6
D/A
Maximum
Current
Adjustment
RSET
Functional Description
The AAT3164 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 AAT3164
charge pump is enabled when any of the six cur-
rent sink inputs near dropout. The charge pump
initially starts in 1.5X mode. If the charge pump
output droops enough for any current sink input to
become close to dropout, the charge pump will
automatically transition to 2X mode. The AAT3164
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 S
2
Cwire serial interface enables the AAT3164
and sets the current sink magnitudes. Since all cur-
rent sinks are truly independent constant current
sinks, the voltage observed on any single given
input will be determined by the actual forward volt-
age (V
F
) for the LED being driven. Unused sink
inputs must be connected to OUT, otherwise the
part will operate in 2X charge pump mode only.
Constant Current Output Level Settings
The current sink magnitude is controlled by
AnalogicTech's S
2
Cwire serial digital input. The
maximum current is programmed by an external
resistor at the RSET pin. Since each current sink is
programmable, no PWM (pulse width modulation)
or additional control circuitry is needed to control
LED brightness. This feature greatly reduces the
burden on a microcontroller or system IC to man-
age LED or display brightness, allowing the user to
"set it and forget it." With its high-speed serial inter-
face (1MHz data rate), the input sink current can be
changed quickly and easily. The code settings for
the AAT3164 are listed in Table 1.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3166 | 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 |
| AAT3166IWP-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 |
| AAT3167 | 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 |
| 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 |
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