IS31LT3171 LED DRIVER Datasheet

IS31LT3171 Datasheet, PDF, Equivalent


Part Number

IS31LT3171

Description

10-TO-150MA CONSTANT-CURRENT LED DRIVER

Manufacture

ISSI

Total Page 9 Pages
Datasheet
Download IS31LT3171 Datasheet


IS31LT3171
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 for-
thermal protection
- Open circuit and over voltage protection
Up to 1W power dissipation in a small SOT23-6
package
RoHS compliant (Pb-free) package
APPLICATIONS
Linear current sink
Current limiter for power supplies
LED signage
Retail lighting in refrigerator, freezer case and
vending machines
Instrumentation LED lighting
TYPICAL APPLICATION CIRCUIT
Figure 1 Typical Application Circuit
Integrated Silicon Solution, Inc. – www.issi.com  
Rev. 00A, 05/20/2014 
  1 

IS31LT3171
IS31LT3170/71
PIN CONFIGURATION
Package
Pin Configuration (Top View)
SOT23-6
PIN DESCRIPTION
No. Pin
1
2,3,5
4
6
EN
OUT
GND
REXT
Description
Enable pin (PWM input IS31LT3171 only).
Current sink.
Ground.
Optional current adjust.
Integrated Silicon Solution, Inc. – www.issi.com  
Rev. 00A, 05/20/2014 
  2 


Features IS31LT3170/71 10-TO-150MA CONSTANT-CURR ENT LED DRIVER Advanced Information Ju ly 2014 GENERAL DESCRIPTION The IS31LT 3170 and IS31LT3171 are adjustable line ar current devices with excellent tempe rature stability. A single resistor is all that is required to set the operati ng current from 10mA to 150mA. The devi ces can operate from an input voltage f rom 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 t he additional requirement of input or o utput capacitors, inductors, FETs or di odes. The complete constant current dri ver requires only a current set resisto r and a small PCB area making designs b oth efficient and cost effective. The E N Pin (1) of the IS31LT3171 can functio n as the PWM signal input used for LED dimming purposes. As a current sink it is ideal for LED lightin.
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