LM62440ALPQRJRRQ1

The LM62440-Q1 is an automotive-focused, high-performance, DC-DC synchronous step-down converter. With integrated high-side and low-side MOSFETs, up to 4 A of output current is delivered over a wide input range of 3.0 V to 36 V; 42-V tolerance supports load dump for durations of 400 ms. The LM62440-Q1 implements soft recovery from dropout, eliminating overshoot on the output.

The LM62440-Q1 is specifically designed for minimal EMI. The device incorporates pseudorandom spread spectrum, adjustable SW node rise time, a low-EMI VQFN-HR package featuring low switch node ringing, and an optimized pinout for ease of use. The switching frequency can be synchronized between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands. In addition, either 2.1-MHz or 400-kHz frequency factory options can be selected for improved efficiency at low operating frequency or smaller solution size at high operating frequency.

Auto mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of only 7 µA (typical) and high light load efficiency. Seamless transition between PWM and PFM modes, along with very low MOSFET ON resistances and an external bias input, provides exceptional efficiency across the entire load range.

Key Features

• AEC-Q100 qualified for automotive applications
  • Temperature grade 1: –40°C to +150°C, T_J
• Functional Safety-Capable
  • Documentation available to aid functional safety system design
• Optimized for ultra low EMI requirements
  • HotRod™ package and parallel input path minimize switch node ringing
  • Spread spectrum reduces peak emissions
  • 2.1-MHz and 400-kHz factory options
  • Adjustable SW node rise time
  • Pin selectable FPWM mode for constant frequency at light loads
• Designed for automotive applications
  • Supports 42-V automotive load dump
  • ±1% total output regulation accuracy
  • V_OUT adjustable from 1 V to 95% of V_IN, with factory options for 5-V and 3.3-V fixed output voltages
• High efficiency power conversion at all loads
  • 7-µA no load current at 13.5 V_IN, 3.3 V_OUT
  • 83% PFM efficiency at 1 mA, 13.5 V_IN, 5 V_OUT
  • External bias option for improved efficiency
• Suitable for scalable power supplies
  • Pin compatible with:
    • LM61440-Q1 (36 V, 4 A, adjustable f_SW)
    • LM61460-Q1 (36 V, 6 A, adjustable f_SW)
    • LMQ62440-Q1 (36 V, 4 A, internal capacitors)