Datasheet > SC652

SC652

更新时间： 2024-11-10 06:10:15

品牌	Logo	应用领域
商升特 - SEMTECH		驱动器泵
页数	文件大小	规格书
16页	282K
描述
Backlight Driver for 5 LEDs with Charge Pump and PWM Control

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中文翻译

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SC652 数据手册

SC652

Backlight Driver for 5 LEDs with

Charge Pump and PWM Control

POWER MANAGEMENT

Features

Description

Input supply voltage range — 2.9V to 5.5V

Charge pump modes — 1x, 1.5x and 2x

PWM dimming control with low pass ﬁlter provides

DC backlight current (not pulsed)

The SC652 is a high eﬃciency charge pump LED driver

using Semtech’s proprietary charge pump technology.

Performance is optimized for use in single-cell Li-ion

battery applications.

PWM frequency range — 200Hz to 50kHz

Five adjustable current sinks — 500μA to 25mA

Backlight current accuracy 1.5ꢀ typical

Backlight current matching 0.5ꢀ typical

LED ﬂoat detection

Charge pump frequency — 250kHz

Low shutdown current — 0.1μA typical

Ultra-thin package — 2 x 2 x 0.6(mm)

Fully WEEE and RoHS compliant

The device provides backlight current using up to five

matched current sinks. The load and supply conditions

determine whether the charge pump operates in 1x, 1.5x,

or 2x mode.

The maximum current per LED is set by a resistor (R_ISET

)

connected from the ISET pin to the input voltage. The

current can be set between 500μA and 25mA. This current

can be varied by applying a pulse-width modulated (PWM)

signal to the EN/PWM pin. A low-pass filter is used to

develop a DC current level rather than a pulsed current

output, resulting in a more eﬃcient system. The resulting

DC current in each LED (I_BL) is equal to the maximum

current setting multiplied by the duty cycle of the PWM

control signal. Using this control system, I_BLcan gradually

fade between levels.

Applications

Cellular phones, smart phones, and PDAs

LCD display modules

Portable media players

Digital cameras

Personal navigation devices

Display/keypad backlighting and LED indicators

With a 2 x 2 (mm) package and 4 small capacitors, the

SC652 provides a complete LED driver solution with a

minimal PCB footprint.

Typical Application Circuit

SC652

V_BAT= 2.9V to 5.5V

OUT

C_OUT

2.2μF

PWM

Signal

EN/PWM

C_IN

2.2μF

BL1

BL2

BL3

BL4

BL5

R_ISET

ISET

GND

C1+ C1- C2+ C2-

2.2μF

US Patents: 6,504,422; 6,794,926

March 13, 2009

12 3 4 5 6 7...16

中文翻译

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