IS31LT3177 Datasheet | Lumissil

DESCRIPTION The IS31LT3177 and IS31LT3178 are adjustable linear current devices with excellent temperature stability. A single resistor is all that is required to set the operating current from 10m A to 200m A. The devices can operate from an input voltage from 2.9V to 40V with a minimal voltage headroom of 1.0V (Typ.) at 150m A. Designed with a low dropout voltage; the device can drive LED strings close to the supply voltage without switch capacitors or inductors. The IS31LT3177/78 simplifies designs by providing a stable current without the additional requirement of inductors, FETs or diodes. The plete constant current driver requires only a current set resistor and a small PCB area making designs both efficient and cost effective. The EN Pin of the IS31LT3177 can be tied to VBAT or PSM (Power Supply Modulation) signal for high side dimming. The EN Pin of the IS31LT3178 can function as the PWM signal input used for MCU PWM dimming. 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 and SOP-8-EP packages. FEATURES - Low-side current sink - Adjustable from 10m A to 150m A (SOT236)/200m A (SOP-8-EP) with external resistor selection - Wide input voltage range from - 2.9V to 40V (IS31LT3178) - 5V to 40V (IS31LT3177) with a low dropout of typical 1.0V at 150m A - Up to 1k Hz PWM input (IS31LT3178 only) - ±5% current accuracy - Protection features : - 0.6%/K current roll off at high temp over 145°C for thermal protection - Output current limit - Thermal shutdown - Up to 0.77W (SOT23-6)/2.32W (SOP-8-EP) power dissipation in a small package - Ro HS & Halogen-Free pliance - TSCA pliance APPLICATIONS - General lighting - Architectural LED lighting - Channel letters for advertising, LED strips for decorative lighting - Retail lighting in fridge, freezer case and vending machines - Emergency lighting (e.g. steps lighting, exit way sign etc.) Lumissil Microsystems - .lumissil. Rev....