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CAT4139_16 Datasheet, PDF (1/13 Pages) ON Semiconductor – 22V High Current Boost White LED Driver | |||
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CAT4139
22 V High Current Boost
White LED Driver
Description
The CAT4139 is a DC/DC stepâup 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 powerâdown mode with âzeroâ
quiescent current.
In addition to thermal protection and overload current limiting, the
device also enters a very low power operating mode during âOpen
LEDâ fault conditions. The device is housed in a low profile (1 mm
max height) 5âlead TSOTâ23 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 âInârushâ Current Limiting
⢠Shutdown Current Less than 1 mA
⢠Open LED Overvoltage Protection
⢠Automatic Shutdown at 1.9 V (UVLO)
⢠Thermal Overload Protection
⢠TSOTâ23 5âLead (1 mm Max Height)
⢠These Devices are PbâFree, Halogen Free/BFR Free and are RoHS
Compliant
Applications
⢠GPS Navigation Systems
⢠Portable Media Players
⢠Handheld Devices
www.onsemi.com
5
1
TSOTâ23
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
(1â9 (JanâSep), O, N, D (OctâDec))
ORDERING INFORMATION
Device
CAT4139TDâGT3
(Note 1)
Package
TSOTâ23
(PbâFree)
Shipping
3,000/
Tape & Reel
1. NiPdAu Plated Finish (RoHSâcompliant)
© Semiconductor Components Industries, LLC, 2016
1
April, 2016 â Rev. 2
Publication Order Number:
CAT4139/D
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