IS31LT3170

IS31LT3170/71 10-TO-150MA CONSTANT-CURRENT LED DRIVER Advanced Information July 2014 GENERAL DESCRIPTION The IS31LT3170 and IS31LT3171 are adjustable linear current devices with excellent temperature stability. A single resistor is all that is required to set the operating current from 10mA to 150mA. The devices can operate from an input voltage from 2.8V to 42V with a minimal voltage headroom of 0.264V. Designed with a low dropout voltage; the device can drive LED strings close to the supply voltage without switch capacitors or inductors. The IS31LT3170/71 simplifies designs by providing a stable current without the additional requirement of input or output capacitors, inductors, FETs or diodes. The complete constant current driver requires only a current set resistor and a small PCB area making designs both efficient and cost effective. The EN Pin (1) of the IS31LT3171 can function as the PWM signal input used for LED dimming purposes. As a current sink it is ideal for LED lighting applications or current limiter for power supplies. The device is provided in a lead (Pb) free, SOT23-6 package. FEATURES  Low-side current sink - Current preset to 10mA - Adjustable from 10mA to 150mA with external resistor selection  Wide input voltage range from - 2.8V to 42V (IS31LT3171) - 5V to 42V (IS31LT3170) with a low dropout of 0.5V  Up to 10kHz PWM input (IS31LT3171 only)  Protection features: - 0.2%/K negative temperature coefficient forthermal protection - Open circuit and ov...