AL5873Q 55V/250mA THREE-CHANNEL LINEAR LED DRIVER Description Pin Assignments The AL5873Q is an automotive-grade three-channel linear LED Top View driver with PWM dimming and analog dimming control. Each channel can drive up to 250mA with a total driving current up to 750mA. The VIN 1 16 FAULTB LED channel current of the AL5873Q can be set by two reference 2 ADIM NC 15 resistors connected to the REF1 and REF2 pin. 3 14 REF1 PWM The AL5873Q regulates LED current for each channel, accurate NC 4 13 FULL down to 4%, with excellent dimming performance. The AL5873Q EP enters standby mode to save power if no PWM signal is detected. NC 5 12 REF2 GND 6 11 LED1 The AL5873Q monitors the temperature and reduces the LED current GND 7 10 LED2 if the chip temperature exceeds the threshold temperature. And the input under voltage lock-out (UVLO), LED string open / short GND 8 9 LED3 protection, over temperature protection (OTP), and fault indicator (FAULTB) are designed for automotive applications to improve TSSOP-16EP (Type DX) system robustness. The AL5873Q is available in TSSOP-16EP (Type DX) package. Applications Features Automotive LED Inner Lamps Rear Light Tail and Stop Light, Rear Turn Indicator, Parking AEC-Q100 Grade 1 Qualification Light, Fog Light, Reverse Light Wide Input Voltage Range from 5V to 55V Each Channel Up to 250mA Current Capability Set Stop and Tail Current Independently Through 2 Resistors Switch LED Current Between Stop and Tail Function Automatically via FULL Input PWM Dimming via Both PWM Input and Power Supply Analog Dimming via ADIM Input Automatically Enter and Exit Standby Mode without Enable Pin Internal Protections: Input Under Voltage Lock-Out (UVLO) LED String Open Protection LED String Short Protection Over Temperature Protection (OTP) Thermal Fold-back if Chip Temperature Exceeds the Threshold Fault Reporting: UVLO, OTP, LED Open, and LED Short Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) The AL5873Q is suitable for automotive applications requiring specific change control this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. AL5873Q Typical Applications Circuit Tail C IN VIN Stop R PW FAULT M B PWM AL5873 ADIM Q R FUL L FULL LED1 LED2 REF2 LED3 R REF REF1 GND R 2 REF 1 Figure 1. Typical Application Pin Descriptions Pin Number Pin Name Description VIN 1 Power Supply for LED Driver NC 2, 4, 5 No Connection PWM Signal Input for Channel 1 to 3, Internally Pulled Down. PWM 3 This pin also serves as enable function of chip. The chip enters standby mode when the PWM pin is pulled to ground longer than 25ms. GND 6, 7, 8 Ground for LED Driver LED3 9 Channel 3 LED Cathode LED2 10 Channel 2 LED Cathode LED1 11 Channel 1 LED Cathode REF2 12 Stop Reference Current Setting, Enabled When FULL is Pulled High. Select LED Current Level Set by External Resistor. When FULL pin is pulled high, the LED current is set by resistor connected to REF2 pin FULL 13 When FULL pin is pulled low, the LED current is set by resistor connected to REF1 pin. When FULL pin is left floating, this pin is pulled to ground by internal current sink. REF1 14 Tail Reference Current Setting Analog Dimming Input for All Channels. Drive with DC voltage (0.3V < VADIM < 1.5V) to adjust output ADIM 15 current from 0 to 100%. FAULTB 16 Fault Report. Asserted Low to report faulty conditions. Exposed Pad. Internally connected to GND. It should be externally connected to GND and thermal mass Exposed PAD Exposed PAD for enhanced thermal impedance. It should not be used as electrical conduction path. 2 of 16 February 2021 AL5873Q www.diodes.com Diodes Incorporated Document number: DS42780 Rev. 2 - 2 ADVANCED INFORMATION