IS32LT3181-ZLA3

IS32LT3181 RCL DUAL INTENSITY, SIX CHANNEL LED DRIVER WITH FAULT DETECTION April 2017 GENERAL DESCRIPTION FEATURES The IS32LT3181 is a six channel linear current regulator for automotive rear tail light applications such as RCL (Rear Combination Lamps) and CHMSL (Center High Mounted Stop Lamps). It is fully programmable with two LED brightness levels for the different intensity requirements of “stop” bright (DC mode) and “tail” dim (PWM mode).   A logic level at the PWM pin is used to select between the tail and stop output conditions. The stop condition provides the highest intensity output, while the tail condition utilizes an internally generated PWM signal to reduce the intensity of the LEDs’ light output.  An active low fault output signal reports a device error condition. The FAULTB pin of several devices can be tied together to disable all the output stages when a fault is detected by any one of the devices.   The sink current at the OUTx pins is easily set with a single resistor at the STOP pin. The constant-current sink outputs can be combined in parallel to create higher current-driving capability on a single string. A second resistor at the TAIL pin sets the duty cycle of the internal PWM oscillator for dimming the LED output when operating in the tail condition.   An external FET (optional) can be implemented for operation with wide varying supply voltages to minimize device thermal dissipation. Operating voltage from 6V to 42VDC - Withstand 50V load dump 6 constant-current channel sinks - Adjustable from 10mA to 75mA per channel - Channel paralleling for higher current - Low dropout voltage of 0.8V@35mA - Slew rate control on each output for better EMI performance Integrated PWM dimming engine provides two LED brightness levels without external logic - Tail duty cycle programmable from 1% to 95% - PWM logic level input selects between full brightness and PWM dimming levels Support for optional FET to minimize device power consumption Open Drain FAULTB reporting pin - Programmable FAULTB delay time - Programmable UVLO threshold - LED open circuit detection - STOP pin over current protection - Over temperature protection Device disable upon fault detection - Parallel connection to other devices AEC-Q100 qualification APPLICATIONS      The IS32LT3181 is offered in an eTSSOP-16 package. Rear Combinational Lamp (RCL) Center High Mount Stop Light (CHMSL) Daytime running lamp Fog lamps Turn signal TYPICAL APPLICATION CIRCUIT 1k Q1 VSTRING TAIL 0.1 F 50 3 STOP 220nF CVCC 1 F R1 10k 2 1 6 R2 5 7 10nF 8 RSTOP RTAIL 3.09k 7.72k CDELAY 9 ERC VCC UVLO OUT1 16 FAULTB IS32LT3181 PWM STOP TAIL DELAY OUT6 FB GND 10 RFB1 4 13 RFB2 1k Figure 1 Typical Application Circuit Lumissil Microsystems – www.lumissil.com Rev. B, 04/20/2017 1 IS32LT3181 TYPICAL APPLICATION CIRCUIT (CONTINUE) TAIL CVCC 1 F STOP R1 2 3 1 VCC ERC UVLO 10k R2 5 10nF 6 7 RSTOP RTAIL 3.09k 7.72k 8 CDELAY 9 OUT1 PWM 16 IS32LT3181 FAULTB STOP TAIL DELAY OUT6 FB GND 10 RFB1 10k 4 13 Figure 2 Typical Application Circuit (Without External FET) Figure 3 Several Devices Connect FAULTB Pin In Parallel Lumissil Microsystems – www.lumissil.com Rev. B, 04/20/2017 2 IS32LT3181 PIN CONFIGURATION Package Pin Configuration (Top view) eTSSOP-16 PIN DESCRIPTION No. Pin Description 1 UVLO A resistive voltage divider from VCC to GND sets the under voltage lockout to prevent false triggering during power up. 2 VCC Power input for the IC. 3 ERC External regulator control output. Drive the gate of an external PMOS FET to operate it in linear voltage regulator mode. 4 FB Reference input voltage for the external resistor divider (1.05V typical) for voltage regulation. If no external PMOS FET is used then connect to VCC with a 10k ohm resistor. 5 PWM Digital logic input. Logic high to select full intensity (DC output current) and logic low (or floating) to select lower intensity (PWM output current). 6 FAULTB Active low open drain fault flag to indicate error condition. This pin can be connected to other device FAULTB pins to disable LED array under a fault condition. 7 STOP Resistor to GND on this pin globally sets the maximum sink current for each LED channel. 8 TAIL Resistor to GND on this pin sets the duty cycle of the internally generated PWM signal which determines the lower LED intensity TAIL condition. 9 DELAY Capacitor to GND on this pin sets a delay time before fault reporting. The minimum capacitor value is 10pF. This pin CANNOT be left floating. 10~12 OUT6 ~OUT4 Output current sink channel 6~4. 13 GND Ground connection for the IC. 14~16 OUT3 ~ OUT1 Output current sink channel 3~1. Thermal Pad Connect to GND. Lumissil Microsystems – www.lumissil.com Rev. B, 04/20/2017 3 IS32LT3181 ORDERING INFORMATION Automotive Range: -40°C To +125°C Order Part No. Package QTY IS32LT3181-ZLA3-TR IS32LT3181-ZLA3 eTSSOP-16, Lead-free 2500/Reel 96/Tube Copyright  ©  2017  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. B, 04/20/2017 4 IS32LT3181 ABSOLUTE MAXIMUM RATINGS UVLO, VCC, ERC, PWM, FAULTB, OUTx, FB, DELAY TAIL, STOP OUTx current Operating junction temperature, TJ Storage temperature range, TSTG Operating ambient temperature range, TJ = TA Package thermal resistance (Junction to ambient), θJA Power dissipation, PD(MAX) (Note 2) ESD (HBM) ESD (CDM) -0.3 to 50V -0.3 to 5.5V 100mA 150°C -55°C ~ +150°C -40°C ~ +150°C 39.9°C/W 3.1W ±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: Refer to Figure 29, package power derating curve on Page 15. ELECTRICAL CHARACTERISTICS Valid are at TJ = -40°C ~+150°C, VCC = 6V~16V, RSTOP =3.09kΩ, RTAIL =7.72kΩ, unless otherwise noted (Note 3) Symbol VCC ICC IOUT_MAX IOUTACC ∆IOUT Parameter Condition Supply voltage Input current Typ. 6 IOUTx =35mA, VCC =16V, 6 channels TJ = -40°C ~+125°C 6.0 TJ = +150°C (Note 5) 6.0 Max. Unit 42 V 8.0 Maximum sink current VOUTx =1.2V 75 Sink current accuracy IOUTx = 35mA = (IOUT_MAX+IOUT_MIN)/2 VOUTx = 0.8V, TJ = -40°C ~+125°C (Note 4) -10 0 10 TJ = +150°C -12 0 12 1-2×IOUT/(IOUT_MAX+IOUT_MIN) IOUTx =35mA, TJ = -40°C ~+125°C -5 0 5 TJ = +150°C -7 0 7 Current matching IL Current leakage VOUTx =42V LR Line regulation 6V< VCC