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SC624ULTRT PDF预览

SC624ULTRT

更新时间: 2024-11-18 03:33:23
品牌 Logo 应用领域
商升特 - SEMTECH
页数 文件大小 规格书
22页 289K
描述
LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and SemWireTM Interface

SC624ULTRT 数据手册

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SC624  
LED Light Management Unit  
Charge Pump, 4 LEDs, Dual LDOs,  
and SemWireTM Interface  
POWER MANAGEMENT  
Features  
Description  
The SC624 is a high efficiency charge pump LED driver  
using Semtech’s proprietary mAhXLifeTM technology.  
Performance is optimized for use in single-cell Li-ion  
battery applications.  
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Input supply voltage range — 3.0V to 5.5V  
Charge pump modes — 1x, 1.5x and 2x  
Four programmable current sinks with 32 steps from  
0.5mA to 25mA  
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Two user-configurable 100mA low-noise LDO  
regulators  
Charge pump frequency — 250kHz  
The charge pump provides backlight current in  
conjunction with four matched current sinks. The load  
and supply conditions determine whether the charge  
pump operates in 1x, 1.5x, or 2x mode. An optional fading  
feature that gradually adjusts the backlight current is  
provided to simplify control software. The SC624 also  
provides two low-dropout, low-noise linear regulators for  
powering a camera module or other peripheral circuits.  
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SemWireTM single wire interface up to 75kbit/s  
Backlight current accuracy 1.5ꢀ typical  
Backlight current matching 0.5ꢀ typical  
Programmable fade-in/fade-out for main backlight  
Automatic sleep mode (LEDs o) IQ = 100μA  
Low shutdown current — 0.1μA (typical)  
Ultra-thin package — 3mm x 3mm x 0.6mm  
Fully WEEE and RoHS compliant  
The SC624 uses the proprietary SemWireTM single wire  
interface. The interface controls all functions of the device,  
including backlight current and two LDO voltage outputs.  
Thesinglewireimplementationminimizesmicrocontroller  
and interface pin counts.  
Applications  
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Cellular phone backlighting  
PDA backlighting  
Camera I/O and core power  
In sleep mode, the device reduces quiescent current to  
100μA while continuing to monitor the serial interface.  
The two LDOs can be enabled when the device is in sleep  
mode. Total current reduces to 0.1μA in shutdown.  
Typical Application Circuit  
MAIN BACKLIGHT  
VIN  
VOUT  
VBAT  
SemWire  
Interface  
COUT  
2.2μF  
SWIF  
CIN  
1μF  
SC624  
BL1  
BL2  
BL3  
BL4  
BYP  
CBYP  
22nF  
GREF  
AGND  
PGND  
VLDO1 = 2.5V to 3.3V  
LDO2 = 1.5V to 1.8V  
LDO1  
LDO2  
V
C1+ C1- C2+ C2-  
CLDO1  
1μF  
CLDO2  
1μF  
C1  
1μF  
C2  
1μF  
US Patents: 6,504,422; 6,794,926  
1
June 27, 2007  
© 2007 Semtech Corporation  

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