CAT4139 Datasheet, PDF (1/13 Pages) Catalyst Semiconductor – 22V High Current Boost White LED Driver

CAT4139
22 V High Current Boost
White LED Driver
Description
The CAT4139 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 CAT4139 is ideal for driving parallel strings of up to five
white LEDs in series or up to 22 V.
LED dimming can be done by using a DC voltage, a logic signal, or
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 TSOT−23 package for space critical applications.
Features
• Switch Current Limit 750 mA
• Drives LED Strings up to 22 V
• Up to 87% 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 mA
• Open LED Overvoltage Protection
• Automatic Shutdown at 1.9 V (UVLO)
• Thermal Overload Protection
• TSOT−23 5−Lead (1 mm Max Height)
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• GPS Navigation Systems
• Portable Media Players
• Handheld Devices
http://onsemi.com
5
1
TSOT−23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
SW
VIN
GND
FB
SHDN
(Top View)
MARKING DIAGRAM
TPYM
TP = Specific Device Code
Y = Production Year (Last Digit)
M = Production Month (1−9, A, B, C)
ORDERING INFORMATION
Device
CAT4139TD−GT3
(Note 1)
Package
TSOT−23
(Pb−Free)
Shipping
3,000/
Tape & Reel
1. NiPdAu Plated Finish (RoHS−compliant)
© Semiconductor Components Industries, LLC, 2010
1
February, 2010 − Rev. 1
Publication Order Number:
CAT4139/D