LED Driver. FAN5345 Datasheet

FAN5345 Driver. Datasheet pdf. Equivalent

FAN5345 Datasheet
Recommendation FAN5345 Datasheet
Part FAN5345
Description Series Boost LED Driver
Feature FAN5345; FAN5345 — Series Boost LED Driver with Single-Wire Digital Interface September 2011 FAN5345 Series.
Manufacture Fairchild Semiconductor
Datasheet
Download FAN5345 Datasheet





Fairchild Semiconductor FAN5345
September 2011
FAN5345
Series Boost LED Driver with Single-Wire Digital Interface
Features
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
Thermal Shutdown (TSD) Protection
Small Form-Factor 6-Lead SSOT23 Package
Applications
Cellular Mobile Handsets
Mobile Internet Devices
Portable Media Players
PDA, DSC, MP3 Players
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
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)
© 2011 Fairchild Semiconductor Corporation
FAN5345 • Rev. 1.0.0
www.fairchildsemi.com



Fairchild Semiconductor FAN5345
Typical Application Diagram
Block Diagram
Figure 1. Typical Application
Figure 2. Functional Block Diagram
© 2011 Fairchild Semiconductor Corporation
FAN5345 • Rev. 1.0.0
2
www.fairchildsemi.com



Fairchild Semiconductor FAN5345
Pin Configuration
VIN 1
GND 2
FB 3
6 SW
5 VOUT
4 EN
Figure 3. Pin Assignments Top View
Pin Definitions
Pin #
5
1
4
3
6
2
Name
VOUT
VIN
EN
FB
SW
GND
Description
Boost Output Voltage. Output of the boost regulator. Connect the LEDs to this pin. Connect COUT
(output capacitor) to GND.
Input Voltage. Connect to power source and decouple with CIN to GND.
Enable Brightness Control. Program dimming levels by driving pin with digital pulses.
Voltage Feedback. The boost regulator regulates this pin to 0.250V to control the LED string current.
Tie this pin to a current setting resistor (RSET) between GND and the cathode of the LED string.
Switching Node. Tie inductor L1 from VIN to SW pin.
Ground. Tie directly to a GND plane.
© 2011 Fairchild Semiconductor Corporation
FAN5345 • Rev. 1.0.0
3
www.fairchildsemi.com





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