September 2011

© 2011 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN5345 • Rev. 1.0.0

FAN5345

Series Boost LED Driver with Single-Wire Digital Interface

Features

 FAN5345S20X: 20V Output

 FAN5345S30X: 30V Output

Brightness Levels

 32 Linear Steps

Applications

Description

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

http://www.fairchildsemi.com/company/green/index.html

for

Fairchild’s definition of green).

Ordering Information

Part Number

Output Voltage Option

Temperature Range

Package

FAN5345S20X

20V

-40 to 85°C

6-Lead, Super-SOT™-6, JEDEC MO-193,

1.6mm Wide (MA06A)

FAN5345S30X

30V

.