June 2012
FAN5346
Series Boost LED Driver with PWM Dimming Interface
Features
Description
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Asynchronous Boost Converter
Drives LEDs in Series:
? FAN5346S20X: 20V Output
? FAN5346S30X: 30V Output
2.5V to 5.5V Input Voltage Range
PWM Dimming for LED Brightness Control
5kHz to 100kHz PWM Dimming Frequency Range
1.2MHz Fixed Switching Frequency
Soft-Start Capability
Input Under-Voltage Lockout (UVLO)
Output Over-Voltage Protection (OVP)
Short-Circuit Detection
Thermal Shutdown (TSD) Protection
Small Form-Factor 6-Lead SSOT23 Package
The FAN5346 is an asynchronous constant-current LED
driver that drives LEDs in series to ensure equal brightness
for all the LEDs. FAN5346S20X has an output voltage of
20V and can drive up to 5 LEDs in series. FAN5346S30X
has an output voltage of 30V and 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 FAN5346 uses a PWM dimming control interface to set
the brightness levels of the LEDs. A PWM signal of 5kHz to
100kHz is applied to the EN pin.
For safety, the device features integrated over-voltage, over-
current, short-circuit detection, and thermal-shutdown
protections. In addition, input under-voltage lockout
protection is triggered if the battery voltage is too low.
The FAN5346 is available in a 6-lead SSOT23 package. It is
“green” and RoHS compliant. (Please see
http://www.fairchildsemi.com/company/green/index.html for
Fairchild’s definition of green).
Applications
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Cellular Mobile Handsets
Mobile Internet Devices
Portable Media Players
PDA, DSC, MP3 Players
Ordering Information
Part Number
FAN5346S20X
FAN5346S30X
Output Voltage Option
20V
30V
Temperature Range
-40 to 85°C
Package
6-Lead, SuperSOT?-6, JEDEC MO-193,
1.6mm Wide (MA06A)
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? 2011 Fairchild Semiconductor Corporation
FAN5346 ? Rev.1.0.1
www.fairchildsemi.com
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