IS32LT3120 Datasheet, PDF (1/14 Pages) Integrated Silicon Solution, Inc – DUAL CHANNEL, LINEAR LED DRIVER WITH FADE IN/FADE OUT

IS32LT3120
DUAL CHANNEL, LINEAR LED DRIVER WITH FADE IN/FADE OUT
GENERAL DESCRIPTION
The IS32LT3120 is a linear programmable current
regulator consisting of 2 output channels capable of up
to 200mA each. Each channel features an ON/OFF
input pin to toggle the channel between the OFF
condition and the source condition.
A single external resistor programs the current level for
both of the channels, while a separate, single resistor
programs the fade in and fade out rate for both
channels.
The device integrates a 63 steps fade in and fade out
algorithm (Gamma correction) which causes the output
LED current to gradually ramp up to the full source
value after the channel’s control pin is pulsed. The
same controller causes the LED current to gradually
ramp down to zero if the channel’s input control pin is
pulsed while the output channel is on. The LED current
output can be controlled by a momentary contact
switch or logic level signal.
The IS32LT3120 is targeted at the automotive market
with end applications to include map and dome lighting
as well as exterior accent lighting. For 12V automotive
applications the low dropout driver can support 1 to 3
LEDs per channel. It is offered in a small thermally
enhanced SOP-8-EP packages.
Preliminary Information
August 2014
FEATURES
 Dual output channels can source up to 200mA
each
 Independent on/off control for each channel
-Inputs are debounced
 Programmable current via a single external
resistor
 Programmable fade in, fade out via external
resistor
- Pull down resistor value sets fade speed
- Gamma corrected fade in/out algorithm
 Fault Protection:
- LED string shorted to GND
- Over temperature
 SOP-8-EP packages
 Automotive Grade - AEC-Q100 (pending)
 Operating temperature range from -40°C ~ +125°C
APPLICATIONS
 Automotive Interior:
- Map light
- Dome lighting
- Puddle lamp in doors
- Glove box
- Vanity mirror
TYPICAL APPLICATION CIRCUIT
Figure 1 Typical Application Circuit
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev.0A, 08/15/2014