IS32LT3120 LED DRIVER Datasheet

IS32LT3120 Datasheet, PDF, Equivalent


Part Number

IS32LT3120

Description

LINEAR LED DRIVER

Manufacture

ISSI

Total Page 16 Pages
Datasheet
Download IS32LT3120 Datasheet


IS32LT3120
IS32LT3120
DUAL CHANNEL, LINEAR LED DRIVER WITH FADE IN/FADE OUT
December 2015
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 package.
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:
- OUTx pin shorted to GND
- ISET pin short to GND
- Over temperature
SOP-8-EP package
Automotive Grade - AEC-Q100
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
Note: The switches on ENx pin should be momentary touch type.
Integrated Silicon Solution, Inc. – www.issi.com
Rev.A, 12/10/2015
1

IS32LT3120
IS32LT3120
PIN CONFIGURATION
Package
Pin Configuration (Top view)
SOP-8-EP
PIN DESCRIPTION
No. Pin
1 TSET
2 ISET
3 GND
4 OUT1
5 OUT2
6 VCC
7 EN2
8 EN1
Thermal Pad
Description
Timing control for the fade in and fade out feature. Connect a
resistor between this pin and GND to set the fade in and fade
out time. Connect this pin directly to ground to disable the fade
function for instant on/off.
Output current setting for both channel 1 and channel 2.
Connect a resistor between this pin and GND to set the
maximum output current.
Ground pin for the device.
Output current source channel 1.
Output current source channel 2.
Power supply input pin.
Internally debounced input pin for control of channel 2.
Momentary contact will toggle the state of the corresponding
OUT2 LED. Fade in or out function can be interrupted by EN2
pin state change after debounce period.
Internally debounced input pin for control of channel 1.
Momentary contact will toggle the state of the corresponding
OUT1 LED. Fade in or out function can be interrupted by EN1
pin state change after debounce period.
Connect to GND.
Integrated Silicon Solution, Inc. – www.issi.com
Rev.A, 12/01/2015
2


Features IS32LT3120 DUAL CHANNEL, LINEAR LED DRIV ER WITH FADE IN/FADE OUT GENERAL DESCR IPTION The IS32LT3120 is a linear progr ammable current regulator consisting of 2 output channels capable of up to 200 mA each. Each channel features an ON/OF F input pin to toggle the channel betwe en the OFF condition and the source con dition. A single external resistor prog rams the current level for both of the channels, while a separate, single resi stor programs the fade in and fade out rate for both channels. The device inte grates a 63 steps fade in and fade out algorithm (Gamma correction) which caus es 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 curr ent to gradually ramp down to zero if t he channel’s input control pin is pul sed while the output channel is on. The LED current output can be controlled b y a momentary contact switch or logic l evel signal. The IS32LT3120 is targeted at the automotive market wi.
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