AL5814Q AUTOMOTIVE COMPLIANT 60V LINEAR DIMMABLE LED CONTROLLER Description Pin Assignments The AL5814Q is an 8-terminal adjustable linear LED controller (Top View) offering excellent temperature stability and output current capability. It works with a wide-input voltage range from 4.5V to 60V. With an external LED driving power device, its internal power dissipation is VCC 1 8 VFAULT minimized compared with traditional linear LED drivers. This makes it ideal for medium-to-high current automotive LED lighting applications. 2 OUT REF 7 EP The AL5814Q has internal output drive capability up to 15mA, which 3 6 VSET SFAULT enables it to drive external bipolar transistors or MOSFETs. It also 4 provides the capability to drive longer LED chains with low dropout GND 5 FB voltage and multiple LED channels. MSOP-8EP VSET pin is used to directly set output current feedback level. Using a resistor divider between REF pin and VSET pin, the output current can be set. Additionally, the use of an NTC resistor allows the creation of an accurate and configurable thermal fold-back behavior. The AL5814Q provides an LED-open detection feature through its VFAULT pin. If VFAULT is brought lower than 2.5V (by any one of the multiple LED channels going open), the AL5814Qs output goes low turning off the external transistors. The device recovers when the open condition is removed. This ability of VFAULT to turn off the external transistors also allows PWM dimming of the LED current by adding PWM control signal on VFAULT pin. AL5814Q is available in the thermally enhanced MSOP-8EP package and is automotive-compliant, qualified to AEC-Q100 Grade 1, supporting PPAP documentation. Features Applications Qualified to AEC-Q100 Grade 1 Automotive Rear Lamps Wide Input Voltage Range from 4.5V to 60V Automotive Interior Lamps Configurable LED Current Setting Automotive Instrumentation Illumination 5% Reference Voltage Tolerance Across Operating Automotive Position Lamps Temperature Automotive License Plate Illumination Low Temperature Drift 15mA Output Drive Capability for MOSFET or Bipolar Transistor LED Open Protection Detected by VFAULT Pin PWM Dimming Realized Through VFAULT Pin LED Thermal Foldback Configured by VSET Overtemperature Protection (OTP) Input Undervoltage Lockout Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) PPAP Capable (Note 4) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See AL5814Q Typical Application Circuit VIN VIN AL5814Q AL5814Q D1 D1 VCC VFAULT VCC VFAULT R3 R3 REF OUT REF OUT R2 R2 Q1 Q1 R5 R5 VSET SFAULT VSET SFAULT C1 C1 GND FB GND FB R1 R1 R6 R6 R4 R4 Figure 1 Pin Descriptions Pin Number Pin Name Function 1 VCC Supply input Internal reference voltage. The maximum recommended output current is 50A and the maximum recommended capacitor 2 REF connected from REF pin to GND is less than 100pF. A potential divider from REF to VSET can be used to accurately set the output LED current. LED current setting threshold. The voltage on VSET sets the reference voltage for the FB pin. This pin is pulled down internally if left 3 VSET floating. The capacitance if needed between VSET and GND is recommended to be less than 1nF. Ground 4 GND Feedback input. When control loop is operating in linear mode, the FB pin will be regulated to the level set by VSET. This pin is pulled up internally if left floating. 5 FB A capacitor may be added between FB and GND to improve noise rejection. Value needs to be limited to 100pF or less. VCC enable level setting for LED-open protection activation. Used in conjunction with VCC to determine 1. If LED-open is activated and 6 SFAULT 2. At what VCC voltage it becomes active This function prevents false triggering on power up. Driving output 7 OUT For 15mA drive current, VCC must be at least 3V greater than V OUT Input for LED-open detection. When LED-open detection function is active, if VFAULT is brought lower than approximately 2.5V, the 8 VFAULT device output will be turned off and will auto-retry driving the output to see if the fault still exists. A PWM dimming function will be realized by adding an open collector/drain signal on this pin. Exposed Pad (Bottom). Recommended to be connected to a large-area contiguous copper GND plane for effective thermal EP EP dissipation. Do not use as the ICs only electrical GND connection. 2 of 14 April 2019 AL5814Q Diodes Incorporated www.diodes.com Document number: DS41792 Rev. 1 - 2 NEW PRODUCT