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September 2011
FAN5345
Series Boost LED Driver with Single-Wire Digital Interface
Features
Description
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Asynchronous Boost Converter
Drives LEDs in Series:
? FAN5345S20X: 20V Output
? FAN5345S30X: 30V Output
2.5V to 5.5V Input Voltage Range
Single-Wire Digital Control Interface to Set LED
Brightness Levels
? 32 Linear Steps
1.2MHz Fixed Switching Frequency
Soft-Start Capability
Input Under-Voltage Lockout (UVLO)
Output Over-Voltage Protection (OVP)
Short-Circuit Detection
The FAN5345 is an asynchronous constant-current LED
driver that drives LEDs in series to ensure equal brightness
for all the LEDs. FAN5345S20X has an output voltage of
20V and can drive up to 5 LEDs in series. FAN5345S30X
has an output voltage of 30V and drive up to 8 LEDs in
series. Optimized for small form-factor applications, the
1.2MHz fixed switching frequency allows the use of small
inductors and capacitors.
The FAN5345 uses a simple single-wire digital control
interface to program the brightness levels of the LEDs in 32
linear steps by applying digital pulses.
For safety, the device features integrated over-voltage, over-
current, short-circuit detection, and thermal-shutdown
protection. In addition, input under-voltage lockout protection
is triggered if the battery voltage is too low.
The FAN5345 is available in a 6-lead SSOT23 package.
It is “green” and RoHS compliant. (Please see
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Thermal Shutdown (TSD) Protection
Small Form-Factor 6-Lead SSOT23 Package
http://www.fairchildsemi.com/company/green/index.html
Fairchild’s definition of green).
for
Applications
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Cellular Mobile Handsets
Mobile Internet Devices
Portable Media Players
PDA, DSC, MP3 Players
Ordering Information
Part Number
FAN5345S20X
FAN5345S30X
Output Voltage Option
20V
30V
Temperature Range
-40 to 85°C
Package
6-Lead, Super-SOT?-6, JEDEC MO-193,
1.6mm Wide (MA06A)
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? 2011 Fairchild Semiconductor Corporation
FAN5345 ? Rev. 1.0.0
www.fairchildsemi.com
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FAN5346S30X 功能描述:LED照明驱动器 Async Series Driver ANLG PWM DIM Intfc RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
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