IS32LT3174-GRLA3-TR

IS32LT3174 SINGLE CHANNEL, LINEAR LED DRIVER WITH FADE IN/FADE OUT June 2016 GENERAL DESCRIPTION FEATURES The IS32LT3174 is a linear programmable current regulator consisting of one output channel capable of up to 200mA. It 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 the channel, while a separate, single resistor programs the fade in and fade out rate for channel.  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 IS32LT3174 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.      Output current can source up to 200mA On/off control for channel -Input is 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 - 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 EN pin should be momentary touch type. Lumissil Microsystems – www.lumissil.com Rev.A, 06/14/2016 1 IS32LT3174 PIN CONFIGURATION Package Pin Configuration (Top view) SOP-8-EP PIN DESCRIPTION No. Pin Description 1 TSET 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. 2 ISET Output current setting. Connect a resistor between this pin and 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. EN Internally debounced input pin for control of channel. Momentary contact will toggle the state of the OUT LED. Fade in or out function can be interrupted by EN pin state change after debounce period. Thermal Pad Connect to GND. 8 Lumissil Microsystems – www.lumissil.com Rev.A, 06/14/2016 2 IS32LT3174 ORDERING INFORMATION AUTOMOTIVE RANGE: -40°C TO +125°C Order Part No. Package QTY/Reel IS32LT3174-GRLA3-TR SOP-8-EP, Lead-free 2500 Copyright  ©  2016  Lumissil  Microsystems.  All  rights  reserved.  Lumissil Microsystems reserves  the  right  to  make  changes  to  this  specification  and  its  products  at  any  time  without  notice.  Lumissil  Microsystems  assumes  no  liability  arising  out  of  the  application  or  use  of  any  information,  products  or  services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and  before placing orders for products.  Lumissil Microsystems does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can  reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in  such applications unless Lumissil Microsystems receives written assurance to its satisfaction, that:  a.) the risk of injury or damage has been minimized;  b.) the user assume all such risks; and  c.) potential liability of Lumissil Microsystems is adequately protected under the circumstances Lumissil Microsystems – www.lumissil.com Rev.A, 06/14/2016 3 IS32LT3174 ABSOLUTE MAXIMUM RATINGS VCC, OUT EN, ISET, TSET Ambient operating temperature, TA = TJ Maximum continuous junction temperature, TJ(MAX) Storage temperature range, TSTG Maximum power dissipation, PDMAX (Note 2) ESD (HBM) ESD (CDM) -0.3V ~ +50V -0.3V ~ +7.0V -40°C ~ +125°C 150°C -55°C ~ +150°C 1.96W ±2kV ±750V Note 1: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note 2: Detail information please refers to package thermal de-rating curve on Page 12. THERMAL CHARACTERISTICS Characteristic Test Conditions Value Package Thermal Resistance (Junction to Ambient), RθJA Package Thermal Resistance (Junction to Pad), RθJP On 4-layer PCB based on JEDEC standard at 1W, TA=25°C 50.98°C/W 2.24°C/W ELECTRICAL CHARACTERISTICS TJ = -40°C ~ +125°C, VCC=12V, the detail refer to each condition description. Typical values are at TJ = 25°C. Symbol Parameter VCC Supply voltage range VDO Minimum dropout voltage ICC Quiescent supply current tON Startup time IOUT_LIM Output limit current IOUT Output current (Note 2) EIOUT Absolute current accuracy (Note 2) Condition Min. Typ. Max. Unit 45 V VCC – VOUT, IOUT= -200mA (Note1) 900 mV VCC – VOUT, IOUT= -100mA (Note1) 700 mV 1 mA 6 OUT is shutdown 0.1 ISET=20kΩ, enable. OUT connects to VCC 3.6 VCC> 6V to IOUT