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| 型号： | SC4539ULTRT |
| 厂商： | Semtech |
| 文件页数： | 1/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR CONST CURRENT 8MLPD |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 680kHz ~ 920kHz |
| 电源电压： | 2.8 V ~ 5.5 V |
| 输出电压： | 5 V ~ 22 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-UFQFN 裸露焊盘 |
| 供应商设备封装： | 8-UMLP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | SC4539ULTRTDKR |
SC4539
High Effi ciency Boost Converter
for up to 6 LEDS
POWER MANAGEMENT
Features
Input voltage range — 2.8V to 5.5V
Programmable LED current up to 30mA
Current-mode PWM control — 800kHz
Soft-start to reduce in-rush current
PWM dimming — 100Hz to 50kHz
PWM dimming at ISET — Analog and filtered
Over-voltage protection — 22V (minimum)
Under-voltage lockout (UVLO)
Thermal shutdown
Shutdown current — <0.1μA (typical)
Ultra-thin package — 2mm x 2mm x 0.6mm
Lead-free package, WEEE and RoHS compliant
Applications
DSLR, DSC, and Video Cameras
Cellular handsets
Portable media players
Personal navigation systems
Satellite radio
Handheld video games
Description
The SC4539 is designed to regulate current for a series
string of white LEDs in LCD backlighting applications
where small size and high effi ciency are priorities. This
device integrates an 800kHz current-mode PWM boost
converter and a 30mA programmable low dropout current
sink regulator.
An external resistor sets the LED current up to 30mA.
PWM dimming (100Hz to 50kHz) may be applied directly
to the enable (EN) pin, or dimming can be controlled by
applying an analog signal to the ISET circuit. The boost
circuit can output up to 22V (guaranteed) to drive up to 6
LEDs in series. The current regulator protects against
shorts between the BL and OUT pins and also eliminates
backlight glow during shutdown when using LEDs with
high leakage. Under-voltage lockout and thermal shut-
down provide additional protection. A small external
capacitor and series resistor control soft-start and loop
compensation. Over-voltage detection protects the
SC4539 if the BL pin is floating or shorted to ground.
The SC4539 is available in an MLPD-8 pin 2mm x 2mm x
0.6mm package, with a rated temperature range of -40°C
to +85°C.
Typical Application Circuit
D
L1
2.8 to
5.5V
Enable and
PWM dimming
C IN
R ISET
IN
EN
ISET
LX
SC4539
OUT
C OUT
C COMP
R COMP
COMP
GND
BL
June 20, 2008
? 2008 Semtech Corporation
1
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