IS31LT3172 Datasheet | Lumissil

DESCRIPTION The IS31LT3172 and IS31LT3173 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 2.5V to 42V with a minimal voltage headroom of 1V (typical). Designed with a low dropout voltage; the device can drive LED strings close to the supply voltage without switch capacitors or inductors. The IS31LT3172/73 simplifies designs by providing a stable current without the additional requirement of input or output capacitors, 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 (3) of the IS31LT3172 can be tied to VBAT or BCM PWM signal for high side dimming. The EN Pin (3) of the IS31LT3173 can function as the PWM signal input used for low side 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, SOP-8-EP package. FEATURES - Low-side current sink - Current preset to 10m A - Adjustable from 10m A to 200m A with external resistor selection - Wide input voltage range from - 2.5V to 42V (IS31LT3173) - 5V to 42V (IS31LT3172) with a low dropout of typical 1V - Up to 10k Hz PWM input (IS31LT3173 only) - Protection features : - 0.26%/K negative temperature coefficient at high temp for thermal protection - Up to 1.8W power dissipation in a small SOP-8EP package - Ro HS pliant (Pb-free) package APPLICATIONS - 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.) TYPICAL APPLICATION CIRCUIT Figure 1 Typical Application Circuit Lumissil Microsystems - .lumissil. Rev. D, 06/07/2022 IS31LT3172/73 PIN CONFIGURATION Package Pin...