Datasheet > AAT3159

AAT3159

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
15页	343K
描述
High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

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PRODUCT DATASHEET

AAT3159

ChargePump^TM

High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

General Description

Features

The AAT3159 is a low noise, constant frequency charge

pump DC/DC converter that uses a tri-mode load switch

(1X), fractional (1.5X), and doubling (2X) conversion to

maximize efficiency for white LED applications. The

device is capable of driving up to four channels of LEDs

at up to 40mA per channel from a 2.7V to 5.5V input

supply voltage. The current sinks may be operated indi-

vidually or in parallel for driving higher-current LEDs. A

low external parts count (two 1μF flying capacitors [C1

and C2] and two small 1μF capacitors [C_INand C_OUT])

makes this part ideally suited for small battery-powered

applications.

• Input Supply Voltage Range: 2.7V to 5.5V

• Tri-Mode (1X/1.5X/2X) Charge Pump

•

Maximizes Efficiency

1MHz Constant Switching Frequency

No Inductors, Low Noise Operation

• Drives Four Channels of LEDs up to 40mA/ Channel

•

User-Programmable LED Current

•

Excellent

Matching

LED

Channel-to-Channel

Current

• Digitally Programmable LED Current with Single-Wire

S²Cwire Interface

•

16 Current Levels From 40mA to 50μA

• Low I_Q(50μA) for Low Current Mode Operation

• True Load Disconnect in Shutdown; I_Q< 1μA

• Built-In Thermal Protection

• Built-In Auto-Disable for Open LED Circuit

• Automatic Soft-Start Minimizes Inrush Startup

Current

AnalogicTech’s patented single-wire Simple Serial

Control™ (S²Cwire™) serial digital interface is used to

enable, disable, and set the current for each LED with 16

levels from a maximum of 40mA down to 50μA. The

maximum current level is programmed via an external

resistor. To save power, low-current mode supply current

will be as low as 50μA.

• 2.85x3x1mm TSOPJW-14 Package

Each output of the AAT3159 is equipped with built- in

protection for V_OUTshort-circuit operation and auto-dis-

able functionality for LED open-circuit conditions. Built-in

soft-start circuitry prevents excessive inrush current

during start-up. A low-current shutdown feature discon-

nects the load from IN and reduces quiescent current to

less than 1μA.

Applications

• Cellphones, DSC, Handheld Devices

• LED Photo Flash

• Programmable Current Sinks

• White LED Backlighting

The AAT3159 is available in a Pb-free, space-saving

2.85x3x1mm TSOPJW-14 package.

Typical Application

C1+

C2+

WLEDs

1μF

OSRAM LW M67C

C1-

C2-

or equivalent

V_BATTERY

3.6V

OUT

AAT3159

C_IN

1μF

C_OUT

1μF

GND

EN/SET

S²Cwire Serial Control

EN/SET

SET

R_SET

26.1kΩ

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

3159.2007.10.1.0

12 3 4 5 6 7...15

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