ZXLD1370Q AUTOMOTIVE COMPLIANT 60V HIGH ACCURACY BUCK/ BOOST/BUCK-BOOST LED DRIVER-CONTROLLER Description Pin Assignments The ZXLD1370Q is an LED driver controller IC for driving external MOSFETs to drive high-current LEDs. It is a multi-topology controller (Top View) that efficiently controls the current through series connected LEDs. The multi-topology enables it to operate in buck, boost and buck- boost configurations. The 60V capability coupled with its multi-topology capability enables it to be used in a wide range of applications and drive in excess of 15 LEDs in series. The ZXLD1370Q is a modified hysteretic controller using a patent pending control scheme providing high output current accuracy in all three modes of operation. High accuracy dimming is achieved through DC control and high frequency PWM control. TSSOP-16EP The ZXLD1370Q uses two pins for fault diagnosis. A flag output Features highlights a fault, while the multilevel status pin gives further information on the exact fault. 0.5% Typical Output Current Accuracy 6V to 60V Operating Voltage Range The ZXLD1370Q is qualified to AEC-Q100 Grade 1 and is automotive LED Driver Supports Buck, Boost and Buck-Boost Configurations compliant supporting PPAP documents. Wide Dynamic Range Dimming 20:1 DC Dimming 1000:1 Dimming Range at 500Hz Up to 1MHz Switching High Temperature Control of LED Current Using TADJ Available in Thermally Enhanced TSSOP-16EP Package with Green Molding Compound Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Automotive Compliant Qualified to AEC-Q100 Grade 1 and TS16949 Certification 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 ZXLD1370Q Pin Descriptions Type Pin Name Pin Function (Note 5) Adjust Input (for DC Output Current Control) Connect to REF to set 100% output current. ADJ 1 I Drive with DC voltage (125mV<V < 2.5V) to adjust output current from 10% to 200% of set value. ADJ The ADJ pin has an internal clamp that limits the internal node to less than 3V. This provides some failsafe should they get overdriven. REF 2 O Internal 1.25V Reference Voltage Output Temperature Adjust Input for LED Thermal Current Control Connect thermistor/resistor network to this pin to reduce output current above a preset temperature TADJ 3 I threshold. Connect to REF to disable thermal compensation function (see section on Thermal Control). Shaping Capacitor for Feedback Control Loop SHP 4 I/O Connect 100pF 20% capacitor from this pin to ground to provide loop compensation. Operation Status Output (Analog Output) Pin is at 4.5V (nominal) during normal operation. STATUS 5 O Pin switches to a lower voltage to indicate specific operation warnings or fault conditions.(see section on STATUS output). Status pin voltage is low during shutdown mode. SGND 6 P Signal Ground - Connect to 0V PGND 7 P Power Ground - Connect to 0V and pin 8 to maximize copper area. Not Connected Internally recommend connection to pin 7 (PGND), to maximize PCB copper for N/C 8 thermal dissipation. Not Connected Internally recommend connection pin 10 (GATE) to permit wide copper trace to gate N/C 9 of MOSFET. GATE 10 O Gate drive output to external NMOS transistor connect to pin 9 Auxiliary Positive Supply to Internal Switch Gate Driver Connect to V , or auxiliary supply from 6V to 15V supply to reduce internal power dissipation (refer to IN VAUX 11 P Application Section for more details). Decouple to ground with capacitor close to device (refer to Applications section). Input Supply to Device (6V to 60V) VIN 12 P Decouple to ground with capacitor close to device (refer to Applications section). Current Monitor Input ISM 13 I Connect current sense resistor between this pin and V . IN The nominal voltage across the resistor is 225mV. Flag Open Drain Output FLAG 14 O Pin is high impedance during normal operation. Pin switches low to indicate a fault, or warning condition. Digital PWM Output Current Control Pin is driven either by open drain or push-pull, 3.3V or 5V logic levels. PWM 15 I Drive with frequency higher than 100Hz to gate output on and off during dimming control. The device enters standby mode when PWM pin is driven with logic low level for more than 15ms nominal (refer to Application Section for more details). Gain Setting Input Used to set the device in Buck, Boost or Buck-Boost modes. Connect to ADJ in Buck mode operation. GI 16 I For Boost and Buck-Boost modes, connect to resistive divider from ADJ to SGND. This defines the ratio of switch current to LED current (see Application Section). The GI pin has an internal clamp that limits the internal node to less than 3V. This provides some failsafe should they get overdriven. EP PAD P Exposed Paddle - Connect to 0V plane for electrical and thermal management. Note: 5. Type refers to whether or not pin is an Input, Output, Input/Output or power supply pin. 2 of 39 ZXLD1370Q February 2018 Diodes Incorporated www.diodes.com Document number: DS37117 Rev. 4 - 2