Datasheet > AAT2848

AAT2848

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		泵
页数	文件大小	规格书
19页	2625K
描述
High-Current Charge Pump For Backlight Display and Flash Applications

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PRODUCT DATASHEET

AAT2848

ChargePump

High-Current Charge Pump For Backlight Display and Flash Applications

The two constant flash current sink outputs (FL1 and

FL2) can drive up to two LEDs with a maximum current

of 300mA each. Because the outputs FL1 and FL2 are

true independent constant flash current sinks, the volt-

age observed on any single given output will be deter-

mined by the difference between V_OUTand the actual

forward voltage (V_F) of the flash LED being driven.

BENS Data

I_BLX(%)

R_BSET(Ω)

100

Any unused flash sink inputs must be connected to the

OUT pin; otherwise, the AAT2848 will operate continu-

ously in 2x charge pump mode regardless of the battery

voltage or V_Fof the remaining diodes connected to the

current sinks. The S²Cwire serial interface at the FENS

input enables the charge pump and sets the flash cur-

rent sink levels.

The backlight and flash LED currents are controlled by a

combination of an external programming resistor from

BSET (for backlight) or FSET (for flash) to AGND and the

backlight or flash serial S²Cwire interface BENS or FENS.

The programming resistor sets the maximum LED cur-

rent for each channel, and the serial S²Cwire interface

controls the LED current relative to the maximum.

15k

(20mA Max)

For backlight LEDs, the maximum channel current can

be set up to 30mA with a 10kΩ resistor connected at the

BSET pin of the AAT2848. Depending upon the applica-

tion and the white LEDs chosen, the preferred and most

accurate method for a backlight LED current control is to

choose R_BSETfor the maximum backlight current required

by the application conditions and use the S²Cwire control

to set the backlight current to lower levels. The 32 levels

provided by the interface allows a smooth transition

between intermediate values. Table 1 and Figure 1 illus-

trate the current magnitude control from the S²Cwire

interface at the BENS pin, based on the maximum cur-

rent set by the R_BSETresistor.

1.5

Table 1: I_BLX(%) vs. BENS Data.

R_BSET= 15kΩ

For flash white LEDs, the maximum channel current can

be set up to 300mA with a 9.53kΩ resistor connected at

the FSET pin of the AAT2848. Depending upon the appli-

cation and the flash white LEDs chosen, the preferred

method for flash LED current control is to choose R_FSETfor

the maximum flash current required by the application

conditions; use the S²Cwire control to set the backlight

current to lower levels. Table 2 and Figure 2 illustrate the

current magnitude control from the S²Cwire interface at

the FENS pin, based on the maximum current set by the

R_FSETresistor.

11 13 15 17 19 21 23 25 27 29 31

BENS Data (#)

Figure 1: BL1-BL4 Current Control Profile.

w w w . a n a l o g i c t e c h . c o m

2848.2008.05.1.0

1...7 8 91011 12 13...19

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AAT2848IDG-T1	ANALOGICTECH	High-Current Charge Pump For Backlight Display and Flash Applications	获取价格
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AAT2856_08	ANALOGICTECH	High Current Charge Pump with Dual LDO for Backlight Applications	获取价格
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AAT2860-1	ANALOGICTECH	Backlight/Flash LED Driver and Multiple LDO Lighting Management Unit	获取价格

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