IS32LT3120-GRLA3-TR ISSI

IS32LT3120 DUAL CHANNEL, LINEAR LED DRIVER WITH FADE IN/FADE OUT December 2015 GENERAL DESCRIPTION FEATURES The IS32LT3120 is a linear programmable current Dual output channels can source up to 200mA regulator consisting of 2 output channels capable of up each to 200mA each. Each channel features an ON/OFF Independent on/off control for each channel input pin to toggle the channel between the OFF -Inputs are debounced condition and the source condition. Programmable current via a single external A single external resistor programs the current level for resistor both of the channels, while a separate, single resistor Programmable fade in, fade out via external programs the fade in and fade out rate for both resistor channels. - Pull down resistor value sets fade speed The device integrates a 63 steps fade in and fade out - Gamma corrected fade in/out algorithm algorithm (Gamma correction) which causes the output Fault Protection: LED current to gradually ramp up to the full source - OUTx pin shorted to GND value after the channels control pin is pulsed. The - ISET pin short to GND same controller causes the LED current to gradually - Over temperature ramp down to zero if the channels input control pin is SOP-8-EP package pulsed while the output channel is on. The LED current Automotive Grade - AEC-Q100 output can be controlled by a momentary contact switch or logic level signal. Operating temperature range from -40C ~ +125C The IS32LT3120 is targeted at the automotive market APPLICATIONS with end applications to include map and dome lighting Automotive Interior: as well as exterior accent lighting. For 12V automotive - Map light applications the low dropout driver can support 1 to 3 - Dome lighting LEDs per channel. It is offered in a small thermally enhanced SOP-8-EP package. - 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. Lumissil Microsystems www.lumissil.com 1 Rev.A, 12/10/2015 IS32LT3120 PIN CONFIGURATION Package Pin Configuration (Top view) SOP-8-EP PIN DESCRIPTION No. Pin 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 1 TSET 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. 2 ISET Connect a resistor between this pin and GND to set the maximum output current. 3 GND Ground pin for the device. 4 OUT1 Output current source channel 1. 5 OUT2 Output current source channel 2. 6 VCC Power supply input pin. Internally debounced input pin for control of channel 2. Momentary contact will toggle the state of the corresponding 7 EN2 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 8 EN1 OUT1 LED. Fade in or out function can be interrupted by EN1 pin state change after debounce period. Thermal Pad Connect to GND. Lumissil Microsystems www.lumissil.com 2 Rev.A, 12/10/2015