Datasheet > AAT3340IWP-1-T1

AAT3340IWP-1-T1

更新时间： 2024-02-06 20:48:39

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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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

put current at the programmed level. The device is dis-

abled 500μs after the EN/SET pin enters 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). Exact counts of

clock pulses for the desired current level should be

entered on the EN/SET pin with a single burst of clocks.

The counter refreshes each time a new clock input to the

EN/SET pin is detected. A constant current is sunk as

long as EN/SET remains in a logic high state. The current

sink pins are switched off after EN/SET has remained low

state for at least the t_OFFtimeout period (see Figure 1).

S²Cwire LED Current S²Cwire

LED Current

(mA)

Data

(mA)

Data

20.0

19.4

18.7

18.1

17.4

16.8

16.1

15.5

14.8

14.2

13.6

12.9

12.3

11.6

11.0

10.3

9.7

9.0

8.4

7.7

7.1

6.5

5.8

5.2

4.5

3.9

3.2

2.6

1.9

1.3

0.6

0.3

LED Selection

The AAT3340 is designed to drive white LEDs with for-

ward voltages up to 4.8V. Since BL1 through BL4 output

current sinks are matched with negligible voltage depen-

dence; the LED brightness will be matched regardless of

their forward voltage matching.

Table 2: S²C Data vs LED Current.

EN/SET Serial Interface

Device Switching Noise Performance

The LED current magnitude is controlled by the EN/SET

pin using the S²Cwire interface. The interface records

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

individual current level settings. Code 1 is full scale, and

Code 32 is 0.3mA. The modulo 32 interface wraps states

back to state 1 after the 32nd clock. The counter can be

clocked at speeds up to 1MHz, so intermediate states are

not visible. The first rising edge of EN/SET enables the

IC and initially sets the output LED current to full scale,

the lowest setting equal to 0.3mA. Once the final clock

cycle is input for the desired brightness level, the EN/

SET pin should be held high to maintain the device out-

The AAT3340 operates at a fixed frequency of 1MHz to

control noise and limit harmonics that can interfere with

the RF operation of cellular telephone handsets or other

communication devices. Back-injected noise appearing

on the input pin of the charge pump is 20mV peak-to-

peak, typically ten times less than inductor-based DC/DC

boost converter white LED backlight solutions. The

AAT3340 soft-start feature prevents noise transient

effects associated with inrush currents during startup of

the charge pump circuit.

tLO

tOFF

OFF

Figure 2: EN/SET Timing Diagram.

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

3340.2008.04.1.0

1...6 7 8910 11 12...14

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