Texas Instruments TPS929240-Q1 24-Channel LED Driver

Texas Instruments TPS929240-Q1 24-Channel LED Driver comes with a FlexWire interface to address increasing requirements for individual control of each LED string. Each device channel can support analog dimming and pulse-width-modulation (PWM) dimming, configured through its FlexWire serial interface. The internal electrically erasable programmable read-only memory (EEPROM) allows users to configure the device during communication loss to fulfill system-level safety requirements.

The Texas Instruments TPS929240-Q1 controls the 8-bit output current and 12-bit PWM duty cycles. The device meets multiple regulation requirements with LED open-circuit, short-to-ground, and single LED short-circuit diagnostics. A configurable watchdog also automatically sets FAIL-SAFE states when the MCU connection is lost, and with programmable EEPROM, TPS929240-Q1 can flexibly be set for different application scenarios.


  • AEC-Q100 qualified for automotive applications
    • –40°C to +125°C, TA temperature grade 1
  • 24-channel precision high-side current output
    • Device supply voltage 4.5V to 40V
    • LED supply voltage 4V to 36V
    • Up to 100mA channel current set by resistor
    • A 2-bit global, 6-bit independent current setting
    • High-current accuracy < ±5% at 5mA to 100mA
    • Low voltage drop 750mV at 100mA
    • 12-bit independent PWM dimming
    • Programmable PWM frequency up to 20kHz
    • Phase-shift PWM dimming
    • Linear and exponential dimming method
  • FlexWire™ control interface
    • Up to 1MHz clock frequency
    • Maximum 16 devices on one FlexWire bus
    • Up to 24 bytes of data transaction in one frame
    • 5V LDO output to supply CAN transceiver
  • Diagnostic and protection
    • Programmable FAIL-SAFE state
    • LED open-circuit detection
    • LED short-circuit detection
    • Single-LED short-circuit diagnostic
    • Programmable low-supply detection
    • Open-drain ERR for fault indication
    • Watchdog and CRC for FlexWire interface
    • 8-bit ADC for pin voltage measurement
    • Overtemperature protection


  • Automotive exterior rear light
  • Automotive exterior headlight
  • Automotive interior ambient light
  • Automotive cluster display

Functional Block Diagram

Block Diagram - Texas Instruments TPS929240-Q1 24-Channel LED Driver
Published: 2023-05-10 | Updated: 2023-05-12