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CAT4240
6 Watt Boost LED Driver
Description
The CAT4240 is a DC/DC step ? up converter that delivers an accurate
constant current ideal for driving LEDs. Operation at a fixed switching
frequency of 1 MHz allows the device to be used with small value
external ceramic capacitors and inductor. LEDs connected in series are
driven with a regulated current set by the external resistor R1. The
CAT4240 high ? voltage output stage is perfect for driving mid ? size and
http://onsemi.com
large panel displays containing up to ten white LEDs in series.
LED dimming can be done by using a DC voltage, a logic signal, or
5
1
a pulse width modulation (PWM) signal. The shutdown input pin
allows the device to be placed in power ? down mode with “zero”
quiescent current.
In addition to thermal protection and overload current limiting, the
device also enters a very low power operating mode during “Open
LED” fault conditions. The device is housed in a low profile (1 mm
max height) 5 ? lead thin SOT23 package for space critical applications.
Features
TSOT ? 23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
SW VIN
GND
?
?
?
?
?
?
?
?
?
?
?
?
Switch Current Limit 750 mA
Drives High Voltage LED Strings (38 V)
Up to 94% Efficiency
Low Quiescent Ground Current 0.6 mA
1 MHz Fixed Frequency Low Noise Operation
Soft Start “In ? rush” Current Limiting
Shutdown Current Less than 1 m A
Open LED Overvoltage Protection
Automatic Shutdown at 1.9 V (UVLO)
Thermal Overload Protection
Thin SOT23 5 ? lead (1 mm Max Height)
These Devices are Pb ? Free, Halogen Free/BFR Free and are RoHS
Compliant
FB SHDN
(Top View)
MARKING DIAGRAM
TGYM
TG = Specific Device Code
Y = Production Year (Last Digit)
M = Production Month (1 ? 9, A, B, C)
ORDERING INFORMATION
Device Package Shipping
Applications
? GPS Navigation Systems
? Portable Media Players
? Handheld Devices, Digital Cameras
CAT4240TD ? GT3
* NiPdAu Plated Finish
TSOT ? 23
(Pb ? Free)
Green*
3,000/
Tape & Reel
V L
L1
D1
VOUT
8 V to C1
16 V
VIN
5V
C3
1 μ F
L1: Sumida CDRH6D28 ? 470
47 m H
4.7 m F/16 V
SW
VIN
CAT4240
SHDN FB
GND
C2
1 μ F/50 V
(300 mV)
R2
1 k W
R1
1 W
300 mA
D1: Central CMSH1 ? 40 (rated 40 V)
Figure 1. Typical Application Circuit
? Semiconductor Components Industries, LLC, 2010
February, 2010 ? Rev. 3
1
Publication Order Number:
CAT4240/D
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