Datasheet > AAT2807AIXN-4.5-T1

AAT2807AIXN-4.5-T1

更新时间： 2024-01-24 05:24:00

品牌	Logo	应用领域
思佳讯 - SKYWORKS		/
页数	文件大小	规格书
12页	291K
描述
Analog Circuit,

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AAT2807AIXN-4.5-T1 技术参数

是否Rohs认证：	符合	生命周期：	Transferred
包装说明：	,	Reach Compliance Code：	unknown
风险等级：	5.57	湿度敏感等级：	1
Base Number Matches：	1

AAT2807AIXN-4.5-T1 数据手册

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AAT2807A

Dual High Efficiency Charge Pump

for White LED and Flash Applications

it and forget it." With its high-speed serial interface

(up to 1MHz data rate), the input sink current can be

changed successively to brighten or dim LEDs, giv-

ing the users real-time control of LED brightness.

Because the inputs D1 to D3 are true independent

constant current sinks, the voltage observed on any

single given input will be determined by the actual

forward voltage (V_F) for the LED being driven.

S²Cwire serial digital input. The interface relies on

the number of rising edges of the EN/SET pin to load

the registers. S²Cwire latches data after the EN/SET

pin has been held high for time T_LAT. The interface

records rising edges of the EN/SET pin and decodes

them into 16 different states, as indicated in Table 1.

There are four brightness levels. To further optimize

power efficiency, the device also offers four low-cur-

rent levels for dim LED operation (Data 13-16). At

the lowest current setting, the internal supply current

reduces to only 80µA typical.

Data

I_OUT(mA)

The interface can be clocked at speeds up to 1MHz,

such that intermediate states are not visible. The

first rising edge of EN/SET enables the IC and ini-

tially sets the output LED current to 20mA. Once the

final clock cycle is input for the desired brightness

level, the EN/SET pin is held high to maintain the

device output current at the programmed level. The

device is disabled 500µs (T_OFF) after the EN/SET

pin transitions to a logic low state.

The EN/SET timing is designed to accommodate a

wide range of data rates. After the first rising edge of

EN/SET, the charge pump is enabled and reaches

full capacity after the soft-start time (T_SS). During the

soft-start time, multiple clock pulses may be entered

on the EN/SET pin to set the final output current level

with a single burst of clocks. The current outputs

remain constant as long as EN/SET remains in a

logic high state. The current outputs are switched off

after EN/SET has remained in a low state for at least

the T_OFFtimeout period; then, the backlight charge

pump enters shutdown mode and draws less than

1µA from V_IN. Data are reset to 0 during shutdown.

0.05

0.5

Table 1: Constant Current Programming Levels.

S²Cwire Serial Interface

The current sink input magnitude on the backlight

charge pump is controlled by AnalogicTech's

S²Cwire Serial Interface Timing Diagram

T_HI

T_OFF

T_LO

T_LAT

EN/SET

n <= 16

Data Reg

2807A.2004.12.1.0

1...6 7 8910 11 12

中文翻译

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