Texas Instruments LM62440-Q1 Low-Noise Step-Down Converter

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

The Texas Instruments LM62440-Q1 is specifically designed for minimal EMI. The device incorporates a 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 200kHz and 2.2MHz to avoid noise-sensitive frequency bands. In addition, either 2.1MHz or 400kHz frequency factory options can be selected for improved efficiency at a low operating frequency or smaller solution size at a high operating frequency.

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

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
- 2.1MHz and 400kHz factory options
- Adjustable SW node rise time
- Pin selectable FPWM mode for a constant frequency at light loads
Designed for automotive applications
- Supports 42V automotive load dump
- ±1% total output regulation accuracy
- V_OUT adjustable from 1V to 95% of V_IN, with factory options for 5V and 3.3V fixed output voltages

High-efficiency power conversion at all loads
- 7µA no-load current at 13.5V_IN, 3.3V_OUT
- 83% PFM efficiency at 1mA, 13.5V_IN, 5V_OUT
- External bias option for improved efficiency
Suitable for scalable power supplies
- Pin compatible with:
  - LM61440-Q1 (36V, 4A, adjustable f_SW)
  - LM61460-Q1 (36V, 6A, adjustable f_SW)
  - LMQ62440-Q1 (36V, 4A, internal capacitors)