FAN5340 Driver Datasheet

FAN5340 Datasheet, PDF, Equivalent


Part Number

FAN5340

Description

Synchronous Constant-Current Series Boost LED Driver

Manufacture

Fairchild Semiconductor

Total Page 13 Pages
Datasheet
Download FAN5340 Datasheet


FAN5340
April 2010
FAN5340
Synchronous Constant-Current Series Boost LED Driver
with PWM Brightness Control and Integrated Load
Disconnect
Features
ƒ Synchronous Current-Mode Boost Converter
ƒ Up to 500mW Output Power
ƒ Supports 2, 3, or 4 LEDs in Series
ƒ 2.7V to 4.8V Input Voltage Range
ƒ 1.2MHz Fixed Switching Frequency
ƒ 1mA Maximum Quiescent Current
ƒ Soft-Start Capability
ƒ Input Under-Voltage Lockout (UVLO)
ƒ Output Over-Voltage Protection (OVP)
ƒ Short-Circuit Detection
ƒ Thermal Shutdown (TSD) Protection
ƒ 8-Lead 3.00 x 3.00mm MLP
ƒ 8-Bump 1.57 x 1.57mm WLCSP
Applications
ƒ Cellular Phones, Smart Phones
ƒ Pocket PCs
ƒ WLAN DC-DC Converter Modules
ƒ PDA, DSC, PMP, and MP3 Players
Description
The FAN5340 is a synchronous constant-current LED driver
capable of efficiently delivering up to 500mW to a string of up
to four LEDs in series. Optimized for small form-factor
applications, the 1.2MHz fixed switching frequency allows
the use of chip inductors and capacitors.
For safety, the device features integrated short-circuit
detection plus over-voltage and thermal shutdown
protections. In addition, input under-voltage lockout
protection is triggered if the battery voltage is low.
Brightness (dimming) control is implemented by applying a
PWM signal of 300Hz to 1kHz on the EN pin. During
shutdown, the FAN5340 disconnects the LED anodes from
the output of the boost regulator, which holds the boost
regulator’s voltage on COUT, reducing audible noise from the
PWM dimming and removing power from the LED string.
2–4
LEDs
GND 1
EN 2
VLED 3
FB 4
RSET
P1
GND
8 VIN
7 VOUT
6 SW
5 PGND
COUT
CIN
Figure 1. Typical Application
Ordering Information
Part Number
FAN5340UCX
FAN5340MPX
(Prelminary)
Operating
Temperature Range
-40 to 85°C
-40 to 85°C
Package
8-Bump, 1.57 x 1.57mm Wafer Level Chip-Scale
Package (WLCSP)
8-Lead, 3.00 x 3.00mm Molded Leadless
Package (MLP)
Packing
Tape and Reel
Tape and Reel
© 2010 Fairchild Semiconductor Corporation
FAN5340 • Rev. 1.0.1
www.fairchildsemi.com

FAN5340
Block Diagrams
VIN
CIN
PGND
EN
GND
L1
Q1
GATE
DRIVE
BOOST
CONTROL
SW
Q2
D1
VOUT
Q3
VLED
COUT
2–4
LEDs
Figure 2. Block Diagram
FB
RSET 15 -
133Ω
Table 1. Recommended External Components
Component
Description
Vendor
Parameter Min. Typ. Max.
Units
L1
22μH Nominal
Murata
L(1)
LQH3NPN220MGOK DCR (Series R)
22
1100
μH
mΩ
COUT
CIN
4.7μF X5R or Better
4.7μF X5R or Better
C 4.7 μF
C 4.7 μF
Note:
1. Minimum L (inductance) incorporates tolerance, temperature, and DC bias effects (L decreases with increasing current).
© 2010 Fairchild Semiconductor Corporation
FAN5340 • Rev. 1.0.1
2
www.fairchildsemi.com


Features FAN5340 — Synchronous Constant-Current Boost Series LED Driver with PWM Brigh tness Control L1 April 2010 FAN5340 S ynchronous Constant-Current Series Boos t LED Driver with PWM Brightness Contro l and Integrated Load Disconnect Featu res ƒ Synchronous Current-Mode Boost C onverter ƒ Up to 500mW Output Power ƒ Supports 2, 3, or 4 LEDs in Series ƒ 2.7V to 4.8V Input Voltage Range ƒ 1.2 MHz Fixed Switching Frequency ƒ 1mA Ma ximum Quiescent Current ƒ Soft-Start C apability ƒ Input Under-Voltage Lockou t (UVLO) ƒ Output Over-Voltage Protect ion (OVP) ƒ Short-Circuit Detection ƒ Thermal Shutdown (TSD) Protection ƒ 8 -Lead 3.00 x 3.00mm MLP ƒ 8-Bump 1.57 x 1.57mm WLCSP Applications ƒ Cellular Phones, Smart Phones ƒ Pocket PCs ƒ WLAN DC-DC Converter Modules ƒ PDA, DS C, PMP, and MP3 Players Description Th e FAN5340 is a synchronous constant-cur rent LED driver capable of efficiently delivering up to 500mW to a string of u p to four LEDs in series. Optimized for small form-factor applications, the 1.2MHz.
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