Datasheet > AAT1239ITP-1-T1

AAT1239ITP-1-T1

更新时间： 2024-02-08 19:00:25

品牌	Logo	应用领域
ANALOGICTECH		转换器
页数	文件大小	规格书
21页	904K
描述
40V Step-Up Converter for 4 to 10 White LEDs

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AAT1239ITP-1-T1 技术参数

生命周期：	Transferred	包装说明：	,
Reach Compliance Code：	unknown	风险等级：	5.82

AAT1239ITP-1-T1 数据手册

PRODUCT DATASHEET

AAT1239-1

SwitchReg^TM

40V Step-Up Converter for 4 to 10 White LEDs

General Description

Features

The AAT1239-1 is a high frequency, high efficiency con-

stant current boost converter capable of driving up to

ten (10) series-connected white LEDs or 40V. It is an

ideal power solutions for backlight applications with up

to ten white LEDs in series. The input voltage is 2.7V to

5.5V for single-cell lithium-ion/polymer (Li-ion) based

portable devices.

• Input Voltage Range: 2.7V to 5.5V

• Maximum Continuous Output 40V @ 30mA

• Drives up to 10 LEDs in Series

Constant LED Current with 3.5% Accuracy Over

▪

Temperature and Input Voltage Range

• Digital Control with S²Cwire Single Wire Interface

26 Discrete Steps

No PWM Control Required

No Additional Circuitry

▪

The LED current is digitally controlled across a 6x oper-

ating range using AnalogicTech’s Simple Serial Control™

(S²Cwire™) interface. Programmability across 26 dis-

crete current steps provides high resolution, low noise,

flicker-free, constant LED outputs. In programming

AAT1239 operation, LED brightness increases based on

the data applied at the EN/SET pin. The SEL logic pin

changes the feedback voltage between two program-

mable ranges.

▪

• Up to 82% Efficiency

• Up to 2MHz Switching Frequency Allows Small External

Chip Inductor and Capacitors

• Hysteretic Control

No External Compensation Components

Excellent Load Transient Response

High Efficiency at Light Loads

▪

• Integrated Soft Start with No External Capacitor

• True Load Disconnect Guarantees <1.0μA Shutdown

Current

The AAT1239-1 features a high current limit and fast,

stable transitions for stepped or pulsed current applica-

tions. The high switching frequency (up to 2MHz) pro-

vides fast response and allows the use of ultra-small

external components, including chip inductors and

capacitors. Fully integrated control circuitry simplifies

design and reduces total solution size. The AAT1239-1

offers a true load disconnect feature which isolates the

load from the power source while in the OFF or disabled

state. This eliminates leakage current, making the devic-

es ideally suited for battery-powered applications.

• SelectableFeedbackVoltageRangesforHighResolution

Control of Load Current

• Short-Circuit, Over-Voltage, and Over-Temperature

Protection

• 12-Pin TSOPJW Package

• -40°C to +85°C Temperature Range

Applications

The AAT1239-1 is available in the Pb-free, thermally-

enhanced 12-pin TSOPJW package.

• Color Display Backlight

• Digital Still Cameras (DSCs)

• Digital Photo Frames

• PDAs and Notebook PCs

• White LED Drivers

Typical Application

DS1

2.2μH

SS16L or equivalent

LIN

PVIN

VIN

2.2μF

M673

2.2μF

Li-Ion:

= 2.7V to 4.2V

374k

AAT1239-1

OVP

12k

Enable/Set

EN/SET

SEL

Feedback Voltage

Select

PGND AGND

I^LED

20mA

R1 (R_BALLAST

30.1

)

White LEDs

OSRAM LW M678

or equivalent

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

1239-1.2007.10.1.0

12 3 4 5 6 7...21

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