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CAT4238 Datasheet(PDF) 1 Page - ON Semiconductor |
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CAT4238 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 12 page © 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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