IS31LT3170

IOUT 150mA
Status Prod
Vdd(V) 5.0-42
Pkg Pin SOT23-6
Document Eval Board
Driver Type Constant Current
Efficiency(%) Non-PWM
Power Transistor Built-in
Product Family 31 = Commercial/Industrial Analog
Part Number 3170 = 3170
Product Type LT = Lighting LED Driver
Package option blank = Tray or Tube

IS31LT3170 Features

  • Low-side current sink
  • - Current preset to 10mA - Adjustable from 10mA to 150mA with external resistor selection
  • Wide input voltage range from
  • - 2.5V to 42V (IS31LT3171) - 5V to 42V (IS31LT3170) with a low dropout of typical 1V
  • Up to 10kHz PWM input (IS31LT3171 only)
  • Protection features:
  • - 0.26%/K negative temperature coefficient at high temp for thermal protection
  • Up to 1W power dissipation in a small SOT23-6 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 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 2.5V 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 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 IS31LT3170 can be tied to Vbat or BCM PWM signal for high side dimming. The EN Pin (1) of the IS31LT3171 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, SOT23-6 package.

 

Related Part Number(s)

Description Stock Qty Available Qty
IS31LT3170-STLS4-TR