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CAT4238 Datasheet(PDF) 1 Page - ON Semiconductor

No. de pieza CAT4238
Descripción Electrónicos  High Efficiency 10 LED Boost Converter
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
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CAT4238 Datasheet(HTML) 1 Page - ON Semiconductor

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© Semiconductor Components Industries, LLC, 2010
February, 2010 − Rev. 4
1
Publication Order Number:
CAT4238/D
CAT4238
High Efficiency 10 LED
Boost Converter
Description
The CAT4238 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. 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
battery−powered applications. The CAT4238 high−voltage output
stage is perfect for driving mid−size 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 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
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 “In−rush” Current Limiting
Shutdown Current Less than 1 mA
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
Applications
GPS Navigation Systems
Portable Media Players
Handheld Devices, Digital Cameras
Portable Game Machines
http://onsemi.com
TSOT−23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
MUYM
MARKING DIAGRAM
Device
Package
Shipping
ORDERING INFORMATION
CAT4238TD−GT3
TSOT−23
(Pb−Free)
Green*
3,000/
Tape & Reel
MU = Specific Device Code
Y = Production Year (Last Digit)
M = Production Month (1−9, A, B, C)
1
5
(Top View)
VIN
SHDN
SW
GND
FB
1
* Lead Finish NiPdAu


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