• Boost Converter
  • Automotive Grade Product, Q100 Grade-1 Qualified
  • Very Wide Input Voltage Range: 4.5 V to 65 V
  • Programmable Soft-Start Period
  • No Loop Compensation Required
  • Stable with Ceramic and Other Low ESR Capacitors with No Audible Noise
  • Nearly Constant Switching Frequency Programmable from 200 kHz to 1 MHz
• Current Regulator
  • Programmable LED Current: 50 mA to 250 mA
  • 10000:1 Contrast Ratio, 300-ns Minimum Pulse Width
  • Two Individual Dimmable LED Strings up to 65V, Total 15 W (Typically 28 LEDs at 150mA)
  • Dynamic Headroom Control Maximizes Efficiency
  • Over-Power Protection
  • ±3% Current Accuracy
• Supervisory Functions
  • Precision Enable
  • COMM I/O Pin for Diagnostic and Commands
  • Thermal Shutdown Protection
  • Thermally Enhanced PWP, 20-Pin Package

• Ultra-High Contrast Ratio 6.5” to 10” LCD Display Backlight up to 28 LEDs
• Automotive or Marine GPS Display

The LM3492HC/-Q1 device integrates a boost converter and a two-channel current regulator to implement a highly efficient and cost effective LED driver. This device drives two individually dimmable LED strings with a maximum power of 15 W and an output voltage of up to 65 V. The boost converter employs a proprietary projected-on-time control method to give a fast transient response with no compensation required. The nearly constant switching frequency can be set to a level from 200 kHz to 1 MHz. Ceramic capacitors stabilize the application circuit and produce no audible noise on dimming. The programmable peak current limit and soft-start features reduce current surges at start-up. An integrated, 190-mΩ, 3.9-A, N-Channel MOSFET switch minimizes the solution size. The fast slew rate current regulator allows high frequency and narrow pulse width dimming signals to achieve a very high contrast ratio of 10000:1. The LED current can be set from 50 mA to 250 mA by a single resistor.