TLD5542-1 H-Bridge DC/DC Controller with SPI Interface Infineon LITIX Power Flex Package PG-VQFN-48 PG-TQFP-48 Marking TLD55421QV TLD55421QU Sales Name TLD5542-1QV TLD5542-1QU 1 Overview Features Single inductor high power Buck-Boost controller 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%) Constant current (LED) and constant voltage regulation Drives multiple loads 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 and input current sense with dedicated monitor outputs 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 or PG-TQFP-48 package Automotive AEC Qualified V IN CIN2 CIN1 VIN IVCC ext C IVCC IIN2 IVCC D D2 1 VFB VIN IIN1 COUT2 COUT3 VDD BST1 R FB BST2 C C COUT1 BST1 BST2 VDD M M 1 4 HSGD1 EN/INUVLO SWN1 LOUT I/O C M COMP 2 M 3 LSGD1 RCOMP COMP V CSOFT START DD SWCS SOFT START Micro controller R FREQ FREQ High SGND I/O PWMI Power PGND1 I/O EOMFS LED Load PGND2 I/O LEDCUR LSGD2 SWN2 V DD VDD HSGD2 VFB R SPI1 CSN FBH RSPI2 SI SPI SPI R SPI3 SO FBL RSPI4 SCLK GND IOUTMON FILT C FILT2 C VSS AGND FILT1 Figure 1 Application Drawing - TLD5542-1 as current regulator Datasheet 1 Rev. 1.10 www.infineon.com 2019-12-11 RPU1 RPU2 R SWCS R R VFBL VFBH TLD5542-1 H-Bridge DC/DC Controller with SPI Interface Overview Description The TLD5542-1 is a synchronous MOSFET H-Bridge 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 TLD5542-1 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 TLD5542-1 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 55 V as LED Driver Boost Mode OUT(max) application conditions) 50 V as LED Driver Buck Mode 50 V as Voltage regulator 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 protection Input undervoltage protection Thermal shutdown of device with autorestart behavior Electrostatic discharge protection (ESD) Diagnostic Functions Latched diagnostic information via SPI Device Overtemperature shutdown and Temperature Prewarning Smart monitoring and advanced functions provide I and I information LED IN Limp Home Function Limp Home activation via LHI pin Applications Especially designed for driving multiple high power LED functions (I.E. Low Beam, High Beam, DRL) Automotive Exterior Lighting: full LED headlamp assemblies General purpose DC/DC voltage regulator Datasheet 2 Rev. 1.10 2019-12-11