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CAT4137 Datasheet(PDF) 1 Page - ON Semiconductor |
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CAT4137 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 15 page © Semiconductor Components Industries, LLC, 2011 November, 2011 − Rev. 3 1 Publication Order Number: CAT4137/D CAT4137 CMOS Boost Converter - White LED Driver Description The CAT4137 is a DC/DC step-up converter that delivers a regulated output current. Operation at a constant switching frequency of 1 MHz allows the device to be used with small value external ceramic capacitors and inductor. The device drives a string of white LEDs connected in series and provides the regulated current to control the LEDs with inherent uniform brightness and matching. An external resistor R1 sets the output current and allows up to 30 mA current to be supported over a wide range of input supply voltages from 2.2 V to 5.5 V, making the device ideal for battery-powered applications. LED dimming can be done by using a DC voltage, a logic signal, or a pulse width modulation (PWM) signal. The shutdown control 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 up to 5 White LEDs from 3 V • Power Efficiency up to 87% • Low Quiescent Ground Current 0.1 mA • Adjustable Output Current (up to 30 mA) • High Frequency 1 MHz Operation • “Zero” Current Shutdown Mode • Operates Down to 2 V (from Two AA Batteries) • Soft Start Power-up • Open LED Low Power Mode • Automatic Shutdown at 1.9 V (UVLO) • Thermal Shutdown Protection • Thin SOT23 5−lead (1 mm Max Height) • These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant Applications • LCD Backlighting • Cellular Phones • Handheld Devices • Digital Cameras http://onsemi.com TSOT−23 TD SUFFIX CASE 419AE PIN CONNECTIONS UEYM MARKING DIAGRAMS Device Package Shipping (Note 4) ORDERING INFORMATION (Note 3) CAT4137TD−T3 (Note 1) TSOT−23 (Pb−Free) 3,000/ Tape & Reel LX = CAT4137TD−T3 UE = CAT4137TD−GT3 Y = Production Year (Last Digit) M = Production Month (1−9, A, B, C) 1 5 (Top View) VIN SHDN SW GND FB 1 LXYM CAT4137TD−GT3 (Note 2) TSOT−23 (Pb−Free) 3,000/ Tape & Reel 1. Matte−Tin Plated Finish (RoHS−compliant). 2. NiPdAu Plated Finish (RoHS−compliant) 3. For detailed information and a breakdown of device nomenclature and numbering systems, please see the ON Semiconductor Device No- menclature document, TND310/D, available at www.onsemi.com 4. For information on tape and reel specifications, in- cluding part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifica- tions Brochure, BRD8011/D. |
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Similar Description - CAT4137_11 |
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