9-Channel IR LED Driver with Buck Regulator and I2C Interface

Features

  • Overvoltage Protection
  • Nine High-Precision Current Sinks
    • LED Current Up to 32mA per Channel
    • ±1% Typical Current Matching
    • ±2% Typical Current Accuracy at 32mA
    • 6-bit Current Dimming Control with I2C
    • Independent On/Off Control
    • Supports both Independent and Global Dimming
  • High Efficiency Buck Regulator
    • Integrated 200mΩ / 100mΩ High / Low-Side FET
    • Adaptive On-Time Control with default 1MHz Switching Frequency, with factory programmable 1.5MHz, 2MHz, and 2.5MHz options
    • Adaptive VOUT Control Based on the Headroom Voltages of the LED Current Sinks
    • Selectable Auto-Skip Mode or Forced-PWM mode at Light Loads
  • 140μA Typical No-Load Supply Current
  • Open-Drain FAULT Signal Output and Fault Reset
  • Extensive Fault Diagnostics
  • -40°C to 85°C Operating Temperature Range
  • Small UQFN-20 (3mm x 3mm) Package

Applications

  • IR LED Drivers
  • Video Doorbells
  • Security Camera
  • IRIS Recognition Cameras

Key Electrical Specifications

Vin(Min) Vin(Max) Number of LEDs/Channel LED Channels Brightness Control Max. Current per Channel VOUT (V) Accuracy (%) No Load Icc – Enabled (mA) No Load Icc – Shutdown (µA) Package
2.7V 5.5V 1 or 2 LEDs 9 I2C 32mA <vin< td=””> </vin<> +/- 2 1.6 0.6 UQFN-20

Typical Application Diagram

KTD2041