IS32LT3174-GRLA3-TR ISSI

IS32LT3174 SINGLE CHANNEL, LINEAR LED DRIVER WITH FADE IN/FADE OUT June 2016 GENERAL DESCRIPTION FEATURES The IS32LT3174 is a linear programmable current Output current can source up to 200mA regulator consisting of one output channel capable of On/off control for channel up to 200mA. It features an ON/OFF input pin to toggle -Input is debounced the channel between the OFF condition and the source Programmable current via a single external condition. resistor A single external resistor programs the current level for Programmable fade in, fade out via external the channel, while a separate, single resistor programs resistor the fade in and fade out rate for channel. - 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 - LED string 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 IS32LT3174 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 - Puddle lamp in doors enhanced SOP-8-EP package. - Glove box - Vanity mirror TYPICAL APPLICATION CIRCUIT Figure 1 Typical Application Circuit Note: The switches on EN pin should be momentary touch type. Lumissil Microsystems www.lumissil.com 1 Rev.A, 06/14/2016 IS32LT3174 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. Connect a resistor between this pin and 2 ISET GND to set the maximum output current. 3 GND Ground pin for the device. 4 OUT Output current source channel. 5 NC Not connect. 6 VCC Power supply input pin. 7 NC Not connect. It must be floating when the IC operates. Internally debounced input pin for control of channel. Momentary contact will toggle the state of the OUT LED. Fade 8 EN in or out function can be interrupted by EN pin state change after debounce period. Thermal Pad Connect to GND. Lumissil Microsystems www.lumissil.com 2 Rev.A, 06/14/2016