TPS9260x-Q1 Single- and Dual-Channel Automotive Headlight LED Driver

1 Features

• Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
  • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature
  • Device HBM ESD Classification Level 2
  • Device CDM ESD Classification Level C4B
• Input Voltage: 4 V–40 V (45 V Abs. Max.)
• Output Voltage: 4 V–75 V (80 V Abs. Max.)
• Fixed-Frequency Current-Mode Controller With Integrated Slope Compensation
• Two Regulation Loops, Constant-Current Output and Constant-Voltage Output of Each Channel
• High-Side Current Sense:
  • 150-mV or 300-mV Sense Voltage (EEPROM Option)
  • ±6-mV Offset (Achieving Approx. 4% or 2% LED Current Accuracy)
• Output Voltage Sense, Internal Voltage Reference: 2.2 V ±5%
• Integrated Low-Side NMOS-FET Driver: Peak Gate-Drive Current Typ. 0.7 A
• Frequency Synchronization
• Both PWM Dimming and Analog Dimming
• Diagnostic:
  • High-Side Current (LED Current) Available as Analog Output
  • Open-LED and Short-to-GND Detection
  • Shorted Output Protection
• Internal Under- and Overvoltage Lockout

2 Applications

• Automotive Headlight LED Driver
• High-Brightness LED Applications

3 Description

The TPS9260x-Q1 family of devices is a single-channel and dual-channel high-side-current LED driver. With full protection and diagnostics, this family of devices is dedicated for and ideally suited to automotive front lighting. The base of each independent driver is a peak-current-mode boost controller. Each controller has two independent feedback loops, a current-feedback loop with a high-side current-sensing shunt and a voltage-feedback loop with an external resistor-divider network. The controller delivers a constant output voltage or a constant output current. The connected load determines whether the device regulates a constant output current (if the circuit reaches the current set-point earlier than voltage set-point) or a constant output voltage (if the circuit reaches the voltage set-point is reached first, for example, in an open-load condition).

Each controller supports all typical topologies such as boost, boost-to-battery, SEPIC, or flyback.

Uses of the high-side PMOS FET driver are for PWM dimming of the LED string and for cutoff in case of an external short circuit to GND to protect the circuit.

1. For all available packages, see the orderable addendum at the end of the datasheet.
2. Device is available as a preview only.