Datasheet > AAT3340IWP-1-T1

AAT3340IWP-1-T1

更新时间： 2024-02-10 23:54:54

品牌	Logo	应用领域
ANALOGICTECH		泵
页数	文件大小	规格书
14页	990K
描述
High Efficiency 1x/1.5x Charge Pump

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技术参数
数据手册

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AAT3340IWP-1-T1 技术参数

生命周期：	Active	包装说明：	,
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.71
接口集成电路类型：	LED DISPLAY DRIVER	Base Number Matches：	1

AAT3340IWP-1-T1 数据手册

PRODUCT DATASHEET

AAT3340

ChargePump

High Efficiency 1x/1.5x Charge Pump

Functional Block Diagram

C1+

Dual-mode

Charge Pump

1X/1.5X

C1-

C2+

C2-

OUT

BL1

32-step S²Cwire

Backlight Control

EN/SET

BL2

Control

Logic

BL3

BL4

GND

Functional Description

Application Information

The AAT3340 is a high efficiency charge pump white LED

driver for portable applications. It can drive 4 white

LEDs.

Current Level Settings

LED current level is set via AnalogicTech’s Simple Serial

Control (S²Cwire) interface in a linear scale where each

code is 0.6mA smaller than the previous code, as shown

in Figure 1. In this manner, the LED current decreases

linearly with each increasing code.

The AAT3340 is a fractional charge pump and can multiply

the input voltage by 1 or 1.5 times. The charge pump

switches at a fixed frequency of 1MHz. The internal-mode-

selection-circuit automatically switches the mode between

1x and 1.5x mode base on the input voltage, output volt-

age and load current. This mode switching maximizes the

efficiency throughout the entire load range.

LED Current vs. S²C Data

(V_F= 3.0V @ 20mA)

When the input voltage is high enough, the AAT3340

operates in 1x mode to provide maximum efficiency. If

the input voltage is too low to supply programmed LED

current, typically when the battery discharges and the

voltage decays, a 1.5x mode is automatically enabled.

When the battery is connected to a charger and the input

voltage become high enough again, the device will

switch back to 1x mode.

10 11 12 13 14 15 16 1718 19 20 21 22 23 24 25 26 27 28 29 30 31 32

The current sink magnitude is controlled by the EN/SET

serial data S²Cwire interface. The interface records rising

edges of the EN/SET pin and decodes them into 32 indi-

vidual current level settings.

S C Code

Figure 1: LED Current Level vs. Simple Serial

Control (S²Cwire).

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

3340.2008.04.1.0

1...5 6 789 10 11...14

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