Datasheet > AAT3194_08

AAT3194_08

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
12页	1265K
描述
High Efficiency 1.5X Fractional Charge Pump For White LED Applications

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PRODUCT DATASHEET

AAT3194

ChargePump

High Efficiency 1.5X Fractional Charge Pump For White LED Applications

General Description

Features

The AAT3194 is a low noise, constant frequency charge

pump DC/DC converters that use fractional (1.5X) conver-

sion to increase efficiency in white LED applications. The

devices can be used to produce current levels up to 20mA

for each output from a 2.7V to 5.5V input. A low external

parts count (two 1µF flying capacitors and two small

bypass capacitors at IN and OUT) makes these devices

ideally suited for small, battery-powered applications.

• V_INRange: 2.7V to 5.5V

• 20mA Full-Scale Current

• Simple Serial Control (S²Cwire) Interface

32-Position Logarithmic Scale with Digital Control

▪

• Low Noise Constant Frequency Operation

• 33% Less Input Current Than Doubler Charge Pump

• High Accuracy Brightness Matching

• Small Application Circuit

• Regulated Output Current

• Automatic Soft Start

• No Inductors

• 600kHz Switching Frequency

• I_Q<1µA in Shutdown

AnalogicTech’s Simple Serial Control™ (S²Cwire™) inter-

face is used to enable, disable, and set the LED drive

current for 32-level logarithmic scale LED brightness

control. The AAT3194 has a thermal management sys-

tem for protection in the event of a short-circuit condi-

tion on any of the output pins. Built-in soft-start circuitry

prevents excessive inrush current during start-up. A high

switching frequency enables the use of small external

capacitors. A low-current shutdown feature disconnects

the load from V_INand reduces quiescent current to less

than 1µA. The AAT3194 is available in a Pb-free 12-pin

TSOPJW package.

• Temperature Range: -40°C to 85°C

• 12-Pin TSOPJW Package

Applications

• Programmable Current Source

• White LED Backlighting

Typical Application

C1+

1µF

C1-

C2+

OUT

C_IN

1µF

C_OUT

1µF

V_BATTERY

AAT3194

C2-

EN/SET

GND

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

3194.2008.05.1.1

12 3 4 5 6 7...12

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