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參數(shù)資料
| 型號： | AAT3131ITP-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications |
| 中文描述： | 高效率電荷泵分數(shù)電荷泵白光LED應用 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 329K |
| 代理商： | AAT3131ITP-T1 |
AAT3131
High Efficiency 1X/1.5X Fractional
Charge Pump for White LED Applications
3131.2004.08.1.1
7
Functional Block Diagram
1x / 1.5x
Charge
Pump
Soft Start
Control
1MHz
Oscillator
Voltage
Reference
Quad
Output
DAC
Single
Output
DAC
Current
Reference
S
2
Cwire
Interface
32x16 bit
ROM
C1+
C1-
C2+
C2-
OUT
D1
D2
D3
D4
GND
EN/SET
VIN
32x16 bit
ROM
Functional Description
The AAT3131 is a dual mode Load Switch (1X) and
high efficiency (1.5X) fractional charge pump
device intended for white LED back light applica-
tions. The fractional charge pump consists of a low
dropout linear voltage regulator followed by a 1.5X
charge pump with multiple current-source outputs.
To maximize power conversion efficiency an inter-
nal feedback control sensing circuit monitors the
voltage required on the constant current source
outputs. This control circuit then sets the load
switch and charge pump functions based upon the
input voltage level versus the output voltage level
needed. This function significantly enhances over
all device efficiency when the input voltage level is
greater then the voltage required at the constant
current source outputs. The 1X Load Switch/1.5X
charge pump mode decision is based on the volt-
age levels sensed on either the D1 output or the
D4 output, which ever is greater. Switchover
between the 1.5X (charge-pump) operating mode
and the 1X (load switch) mode occurs automatical-
ly (as a function of input and output voltages) and
does not require user intervention to maintain max-
imum efficiency.
The AAT3131 requires only four external compo-
nents: 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 output capacitor (C
OUT
). The
LDO/1.5X charge pump output is converted into
three (D1 to D3) constant current outputs to drive
three individual LEDs with a maximum current of
20mA each, and one (D4) constant current output
with a maximum current of 30mA. The current
source output magnitude is controlled by the
EN/SET serial data interface. The interface records
rising edges of the EN/SET pin, and decodes them
into 32 addresses corresponding to individual cur-
rent level settings. The 32 addresses are divided
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PDF描述 |
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| AAT3132 | High Efficiency 1.5X Fractional Charge Pump for White LED Applications |
| AAT3132A | High Efficiency 1.5X Fractional Charge Pump for White LED Applications |
| AAT3132AITP-1-T1 | High Efficiency 1.5X Fractional Charge Pump for White LED Applications |
| AAT3132ITP-1-T1 | High Efficiency 1.5X Fractional Charge Pump for White LED Applications |
| AAT3132ITP-T1 | High Efficiency 1.5X Fractional Charge Pump for White LED Applications |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3132 | 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 |
| AAT3132A | 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 |
| AAT3132AITP-1-T1 | 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 |
| AAT3132ITP-1-T1 | 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 |
| AAT3132ITP-T1 | 制造商:Skyworks Solutions Inc 功能描述:LED Lighting Drivers High Efficiency 1.5x Fractional Chrg Pump |
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