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SC628A
LED Flash Driver
Charge Pump with 1000mA Flash Mode,
POWER MANAGEMENT
Features
Input supply voltage range — 3.0V to 5.5V
Charge pump modes — 1x, 1.5x and 2x
Flash LED — 1000mA max in flash mode, 275mA max
continuous for spotlight
Charge pump frequency — 250kHz
I 2 C compatible interface — up to 400kHz
External flash control pin to sync with camera
One second flash time out with disable feature
Automatic sleep mode (flash off ) — I Q = 100μA
Low shutdown current — 0.1μA (typical)
Ultra-thin package — 3mm x 3mm x 0.6mm
Fully WEEE and RoHS compliant
Applications
Cellular phone flash
PDA flash
275mA Spotlight Mode, and I 2 C Interface
Description
The SC628A is a high effi ciency charge pump LED driver
using Semtech’s proprietary charge pump technology.
Performance is optimized for use in single-cell Li-ion
battery applications. The load and supply conditions
determine whether the charge pump operates in 1x, 1.5x,
or 2x mode.
The charge pump provides continuous spotlight mode
current or pulsed flash mode current to an LED using a
dedicated current sink. In flash mode, a flash-timeout
feature turns off the flash if active for longer than 1 second.
In spotlight mode, the timeout feature is disabled to allow
continuous operation of the LED.
The SC628A uses an I 2 C compatible serial interface to set
the flash mode or the spotlight mode current. The flash/
spotlight output is triggered via either the I 2 C interface or
a dedicated flash enable pin (FLEN).
In sleep mode, the device reduces quiescent current to
100μA while continuing to monitor the serial interface.
Total current reduces to 0.1 μA in shutdown.
Typical Application Circuit
V BAT = 3.0V to 5.5V
IN
OUT
FLASH
I C Clock
C IN
4.7 μ F
I 2 C Data
2
SDA
SCL
SC628A
C OUT
4.7 μ F
Flash Control
Enable Control
FLEN
EN
AGND
PGND
FL
C 1 +
C1-
C2+ C2-
C1
2.2 μ F
C2
2.2 μ F
US Patents: 6,504,422; 6,794,926
July 14, 2009
1
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相关代理商/技术参数
SC628B
制造商:Mallory Sonalert Products Inc 功能描述:
SC628-BTR
功能描述:DC Buzzer Single Tone 2.9kHz Piezo 6 ~ 28V 80dB @ 6V, 61cm 制造商:mallory sonalert products inc. 系列:SC 包装:散装 零件状态:有效 驱动器电路:指示灯，内部驱动 输入类型:DC 电压 - 额定:- 电压范围:6 ~ 28V 频率:2.9kHz 技术:压电 工作模式:单音调 持续时间:- 声压级:80dB @ 6V，61cm 电流 - 电源:3 ~ 18mA 端口位置:顶部 工作温度:-30°C ~ 65°C 认可:cUL，UL 等级:- 安装类型:面板安装 端接:快速连接接片 - 0.250"（6.35mm） 大小/尺寸:42.9mm 直径 高度 - 安装（最大值）:* 标准包装:1
SC628CPN
功能描述:音频指示器及警报器 CHIME, 6-28VDC 2900HZ, CUL APPRVD
RoHS:否 制造商:PUI Audio 产品:Indicators 声压级:85 dB 音调:Continuous 频率:2300 Hz +/- 300 Hz 电压额定值:5 VDC 电流额定值:30 mA 端接类型: 直径:12 mm 安装:Through Hole
SC628CPNR
功能描述:音频指示器及警报器 CHIME, 6-28VDC 2900HZ, CUL APPRVD
RoHS:否 制造商:PUI Audio 产品:Indicators 声压级:85 dB 音调:Continuous 频率:2300 Hz +/- 300 Hz 电压额定值:5 VDC 电流额定值:30 mA 端接类型: 直径:12 mm 安装:Through Hole
SC628D
功能描述:音频指示器及警报器 MED CONTINUOUS 6-28V
RoHS:否 制造商:PUI Audio 产品:Indicators 声压级:85 dB 音调:Continuous 频率:2300 Hz +/- 300 Hz 电压额定值:5 VDC 电流额定值:30 mA 端接类型: 直径:12 mm 安装:Through Hole
SC628D-1
功能描述:音频指示器及警报器 6-28VDC Continuous Panel 1900Hz 80dB
RoHS:否 制造商:PUI Audio 产品:Indicators 声压级:85 dB 音调:Continuous 频率:2300 Hz +/- 300 Hz 电压额定值:5 VDC 电流额定值:30 mA 端接类型: 直径:12 mm 安装:Through Hole
SC628D-BTR
功能描述:DC Buzzer Single Tone 2kHz Piezo 6 ~ 28V 60dB @ 6V, 61cm 制造商:mallory sonalert products inc. 系列:SC 包装:散装 零件状态:有效 驱动器电路:指示灯，内部驱动 输入类型:DC 电压 - 额定:- 电压范围:6 ~ 28V 频率:2kHz 技术:压电 工作模式:单音调 持续时间:- 声压级:60dB @ 6V，61cm 电流 - 电源:6 ~ 23mA 端口位置:顶部 工作温度:-30°C ~ 65°C 认可:cUL，UL 等级:- 安装类型:面板安装 端接:快速连接接片 - 0.250"（6.35mm） 大小/尺寸:42.9mm 直径 高度 - 安装（最大值）:* 标准包装:1
SC628DJ
功能描述:音频指示器及警报器 SLOW MED INTER 6-28V
RoHS:否 制造商:PUI Audio 产品:Indicators 声压级:85 dB 音调:Continuous 频率:2300 Hz +/- 300 Hz 电压额定值:5 VDC 电流额定值:30 mA 端接类型: 直径:12 mm 安装:Through Hole