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SC621A

更新时间： 2024-11-09 03:33:23
品牌 Logo 应用领域
商升特 - SEMTECH 泵
页数 文件大小 规格书
24页 314K
描述
Charge Pump, 4 LEDs, 400mA Flash LED, Dual LDOs, and I2C Interface

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SC621A 数据手册

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SC621A  
LED Light Management Unit  
Charge Pump, 4 LEDs, 400mA Flash LED,  
Dual LDOs, and I2C Interface  
POWER MANAGEMENT  
Features  
Description  
„
„
„
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  
The SC621A 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.  
„
„
Flash LED — 400mA max in flash mode, 250mA max  
continuous for spotlight  
Two user-configurable 100mA low-noise LDO  
regulators  
The charge pump provides backlight current in  
conjunction with four matched current sinks. It also can  
supply continuous or bursted current to a flash LED using  
the dedicated flash driver current sink. 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. A flash-timeout feature disables  
the flash if active for longer than 1 second.The SC621A also  
provides two low-dropout, low-noise linear regulators for  
powering a camera module or other peripheral circuits.  
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„
„
„
„
„
„
„
„
„
„
Charge pump frequency — 250kHz  
I2C compatible interface — up to 400kHz  
Backlight current accuracy 1.5ꢀ typical  
Backlight current matching 0.5ꢀ typical  
Programmable fade-in/fade-out for main backlight  
External flash control pin to sync with camera  
Optional 1s flash time out  
Automatic sleep mode (LEDs off) — IQ = 100μA  
Low shutdown current — 0.1μA (typical)  
Ultra-thin package — 3mm x 3mm x 0.6mm  
Fully WEEE and RoHS compliant  
The SC621A uses an I2C compatible serial interface. The  
interface controls all functions of the device, including  
backlight and flash currents as well as two LDO voltage  
outputs. The flash/spotlight output is triggered via either  
the I2C interface or a dedicated pin.  
Applications  
„
„
„
Cellular phone backlighting and flash  
PDA backlighting and flash  
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  
FLASH  
VIN  
VOUT  
VBAT  
COUT  
4.7μF  
I2C Data  
I2C Clock  
SC621A  
SDA  
SCL  
FLEN  
EN  
CIN  
2.2μF  
Flash Control  
BL  
BL  
BL  
BL  
1
2
3
4
Enable Control  
BYP  
FL  
CBYP  
VLDO1 = 2.5V to 3.3V  
LDO2 = 1.5V to 1.8V  
LDO  
LDO  
1
2
AGND  
PGND  
22nF  
V
C1+ C1- C2+ C2-  
CLDO1  
1μF  
CLDO2  
1μF  
C2  
2.2μF  
C1  
2.2μF  
US Patents: 6,504,422; 6,794,926  
1
June 27, 2007  
© 2007 Semtech Corporation  
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