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SC658EVB

更新时间： 2024-09-19 06:10:19
品牌 Logo 应用领域
商升特 - SEMTECH 驱动器二极管
页数 文件大小 规格书
22页 525K
描述
Backlight Driver for 4 LEDs with SemPulseTM Interface

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SC658EVB 数据手册

 浏览型号SC658EVB的Datasheet PDF文件第2页浏览型号SC658EVB的Datasheet PDF文件第3页浏览型号SC658EVB的Datasheet PDF文件第4页浏览型号SC658EVB的Datasheet PDF文件第5页浏览型号SC658EVB的Datasheet PDF文件第6页浏览型号SC658EVB的Datasheet PDF文件第7页 
SC658  
Backlight Driver for 4 LEDs  
with SemPulseTM Interface  
POWER MANAGEMENT  
Features  
Description  
Input supply voltage range — 2.9V to 5.5V  
Very high efficiency charge pump driver system with  
three modes — ꢀx, ꢀ.5x and 2x  
Four programmable current sinks — 0mA to 25mA  
Up to three LED grouping options  
Fade-in/fade-out feature for main LED bank  
Charge pump frequency — 250kHz  
SemPulse single wire interface  
Backlight current accuracy — ꢀ.5% typical  
Backlight current matching — 0.5% typical  
LED float detection  
Automatic sleep mode (LEDs off) — IQ = 60µA (typ.)  
Shutdown current — 0.ꢀµA (typical)  
Ultra-thin package — 2 x 2 x 0.6 (mm)  
Fully WEEE and RoHS compliant  
The SC658 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.  
The charge pump provides backlight current utilizing four  
matched current sinks. The load and supply conditions  
determine whether the charge pump operates in ꢀx, ꢀ.5x,  
or 2x mode. An optional fading feature that gradually  
adjusts the backlight current is provided to simplify  
control software.  
The SC658 uses the proprietary SemPulseTM single wire  
interface to control all functions of the device, including  
backlight currents. The single wire interface minimizes  
microcontroller and interface pin counts. The four LEDs  
can be grouped in up to three separate banks that can be  
independently controlled.  
Applications  
Cellular phones, smart phones, and PDAs  
LCD modules  
Portable media players  
Digital cameras  
Personal navigation devices  
Display/keypad backlighting and LED indicators  
The SC658 enters sleep mode when all the LED drivers are  
disabled. In this mode, the quiescent current is reduced  
while the device continues to monitor the SemPulse  
interface.  
With a 2 x 2 (mm) package and four small capacitors, the  
SC658 provides a complete LED driver solution with a  
minimal PCB footprint.  
Typical Application Circuit  
VBAT = 2.9 to 5.5V  
IN  
OUT  
COUT  
CIN  
2.2µF  
2.2µF  
SC658  
BL1  
BL2  
BL3  
BL4  
From  
Microprocessor  
SPIF  
GND  
C1+ C1- C2+ C2-  
C1  
2.2µF  
C2  
2.2µF  
US Patents: 6,504,422; 6,794,926  
ꢀ
April 3, 2009  
© 2009 Semtech Corporation  
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