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CAT4238_16 Datasheet, PDF (1/12 Pages) ON Semiconductor – High Efficiency 10 LED Boost Converter | |||
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CAT4238
High Efficiency 10 LED
Boost Converter
Description
The CAT4238 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. LED currents up to 40 mA can be supported over a wide range of
input supply voltages up to 5.5 V, making the device ideal for
batteryâpowered applications. The CAT4238 highâvoltage output
stage is perfect for driving midâsize and 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
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 thin SOT23 package for space critical
applications.
Features
⢠Drives High Voltage LED Strings (38 V)
⢠Up to 87% Efficiency
⢠Low Quiescent Ground Current 0.6 mA
⢠Adjustable Output Current
⢠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
⢠Thin SOT23 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, Digital Cameras
⢠Portable Game Machines
www.onsemi.com
5
1
TSOTâ23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
SW
VIN
GND
FB
SHDN
(Top View)
MARKING DIAGRAM
MUYM
MU = Specific Device Code
Y = Production Year (Last Digit)
M = Production Month
(1â9 (JanâSep), O, N, D (OctâDec))
ORDERING INFORMATION
Device
CAT4238TDâGT3
Package
TSOTâ23
(PbâFree)
Green*
Shipping
3,000/
Tape & Reel
* Lead Finish NiPdAu
© Semiconductor Components Industries, LLC, 2016
1
April, 2016 â Rev. 5
Publication Order Number:
CAT4238/D
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