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UM1351 Datasheet(PDF) 3 Page - Union Semiconductor, Inc. |
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UM1351 Datasheet(HTML) 3 Page - Union Semiconductor, Inc. |
3 / 14 page ________________________________________________________________________ http://www.union-ic.com Rev.01 Mar.2014 3/14 UM1351 Pin Description Pin Number Symbol Function 1 LX Drain of NDMOS switch. 2 GND Ground (0V). 3 VSET Multi-function On/Off and brightness control pin: Leave floating for normal operation Drive to voltage below 0.2V to turn off output current Drive with DC voltage (0.3V<VSET<2.5V) to adjust output current from 12% to 100% of IOUTnom Drive with PWM signal from open-collector or open-drain transistor, to adjust output current. Adjustment range 1% to 100% of IOUTnom for f<100kHz. Connect a capacitor from this pin to ground to increase soft-start time. (Default soft-start time=10μs. Additional soft-start time is approximately 700μs/nF.) 4 ISENSE Connect resistor RS from this pin to VIN to define nominal average output current IOUTnom = 0.1/RS 5 VIN Input voltage (6V to 35V). Decouple to ground with 10μF or higher X7R ceramic capacitor close to device. Absolute Maximum Ratings Over operating free-air temperature (unless otherwise noted) (Note 1) Symbol Parameter Value Unit VIN Input Voltage Range -0.3 to +35 V VLX, VISENSE Voltages on LX, ISENSE -0.3 to +35 V VSET VSET Pin Voltage -0.3 to +6 V θ jA Thermal Resistance (Junction to Ambient) 180 °C/W θ jC Thermal Resistance (Junction to Case) 100 °C/W TJ Maximum Junction Temperature +150 °C TSTG Storage Temperature Range -55 to +150 °C TL Maximum Lead Temperature for Soldering 5 seconds +300 °C Note 1: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. All voltage values are with respect to network ground terminal. Recommended Operating Conditions Symbol Parameter Min Typ Max Unit VIN Input Voltage Range 6.0 35 V TA Operating Ambient Temperature -40 85 °C TJ Operating Junction Temperature -40 150 °C |
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