TLD5541-2QV Dual SYNC DC/DC Controller with SPI Interface Infineon LITIX Power Flex Package PG-VQFN-48-31 Marking TLD55412QV Sales Name TLD5541-2QV 1 Overview Features Dual-Channel synchronous DC/DC Controller for HIGH POWER LED drivers Wide LED forward voltage Range (2 V up to 55 V) Wide VIN Range (IC 4.5 V to 40 V, Power 4.5 V to 55 V) Switching Frequency Range from 200 kHz to 700 kHz SPI for diagnostics and control Maximum Efficiency in every condition (up to 96%) Multitopology constant Current (LED) and Constant Voltage Regulation Drives Multiple Load with a single IC thanks to the Fast Output Discharge operation Limp Home Function (Fail Safe Mode) EMC optimized device: Features an auto Spread Spectrum LED current sense with dedicated monitor Output Advanced protection features for device and load Enhanced Dimming features: Analog and PWM dimming LED current accuracy +/- 3% Available in a small thermally enhanced PG-VQFN-48-31 package Automotive AEC Qualified C IVCC V bat C IN1 V POW BUCK D1 IVCC ext C IN3 PWMI1 Digital dimminig CH1 BST1 C MODE1 BST1 M COMP1 1 HSGD1 L1 C C C SOFT START1 OUT11 OUT12 OUT13 SWN1 RFB1 CSoft Start1 CCOMP1 M2 Channel LSGD1 SWCS1 1 SET1 Analog Dimming CH1 RSWCS1 SGND1 IOUTMON1 Output Current Monitoring CH1 VFB1 Device Enable EN FBH1 Fail Safe Activation LHI FBL1 Digital Supply (+5V) VDD PGND1 CSN VPOW BOOST SI SPI CIN2 SO IVCC SCLK SYNC C SYNC signal D RFREQ FREQ 2 BST2 L 2 C BST2 COUT22 PWMI2 Digital dimminig CH2 C C C M4 OUT21 OUT23 OUT24 SWN2 RFB2 MODE2 IVCC COMP2 LSGD2 M3 SWCS2 SOFT START2 Channel RSWCS2 SGND2 2 HSGD2 CSoft Start2 VFB2 CCOMP2 FBH2 SET2 Analog Dimming CH2 FBL2 IOUTMON2 PGND2 Output Current Monitoring CH2 VSS AGND Figure 1 Application Drawing - TLD5541-2QV as current regulator Datasheet 1 Rev. 1.00 www.infineon.com 2017-07-11 R R COMP2 COMP1 VIN IVCC RVFBL2 RVFBH2 R R VFBL1 VFBH1 TLD5541-2QV Dual SYNC DC/DC Controller with SPI Interface Overview Description The TLD5541-2QV is a synchronous DUAL Channel DC/DC controller with built in protection features and SPI interface. This concept is beneficial for driving high power LEDs with maximum system efficiency and minimum number of external components. The TLD5541-2QV offers both analog and digital (PWM) dimming.The switching frequency is adjustable in the range of 200 kHz to 700 kHz. It can be synchronized to an external clock source. A built in programable Spread Spectrum switching frequency modulation and the forced continuous current regulation mode improve the overall EMC behavior. Furthermore the current mode regulation scheme provides a stable regulation loop maintained by small external compensation components. The adjustable soft start feature limits the current peak as well as voltage overshoot at start-up. The TLD5541-2QV is suitable for use in the harsh automotive environment. Table1 Product Summary Power Stage input voltage range V 4.5 V 55 V POW Device Input supply voltage range V 4.5 V 40 V VIN Maximum output voltage (depending by the V 55V Boost Mode OUT(max) application conditions) 50 V Buck Mode Switching Frequency range f 200 kHz... 700 kHz SW Typical NMOS driver on-state resistance at R 2.3 DS(ON PU) T = 25C (Gate Pull Up) j Typical NMOS driver on-state resistance at R 1.2 DS(ON PD) T = 25C (Gate Pull Down) j SPI clock frequency f 5MHz SCLK(MAX) Protective Functions Over load protection of external MOSFETs Shorted load, output overvoltage and overcurrent protection Input undervoltage protection Thermal shutdown of device with autorestart behavior Electrostatic discharge protection (ESD) Diagnostic Functions Latched diagnostic information via SPI Open load detection in ON-state Device Overtemperature shutdown and Temperature Prewarning Smart monitoring and advanced functions provide I information LED Limp Home Function Limp Home activation via LHI pin Applications Especially designed for driving high power LEDs in automotive applications Automotive Exterior Lighting: full LED headlamp assemblies (Low Beam, High Beam, Matrix Beam, Pixel Light) General purpose current/voltage controlled DC/DC LED driver Datasheet 2 Rev. 1.00 2017-07-11