IS31LT3173

IOUT 200mA
Status Prod
Vdd(V) 2.5-42
Pkg Pin eSOP-8-EP
Document
Driver Type Constant Current
Efficiency(%) Digital Supply PWM
Power Transistor Built-in
Product Family 31 = Commercial/Industrial Analog
Part Number 3173 = 3173
Product Type LT = Lighting LED Driver
Package option blank = Tray or Tube

IS31LT3173 Features

  • Low-side current sink
  • - Current preset to 10mA - Adjustable from 10mA to 200mA 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 10kHz 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-8- EP package
  • RoHS compliant (Pb-free) package
  • Architectural LED lighting
  • Channel letters for advertising, LED strips for decorative lighting
  • Retail lighting in fridge, freezer case and vending machines

Overview

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 10mA to 200mA. 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 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 (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.

 

Related Part Number(s)

Description Stock Qty Available Qty
IS31LT3173-GRLS4-TR 1,119