Automotive 3-V to 36-V, 4-A, low-noise synchronous step-down converter
Product details
Parameters
Package | Pins | Size
Features
- AEC-Q100 qualified for automotive applications
- Temperature grade 1: –40°C to +150°C, TJ
- 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
- 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
- VOUT adjustable from 1 V to 95% of VIN, with factory options for 5-V and 3.3-V fixed output voltage
- High efficiency power conversion at all loads
- 7-µA no load current at 13.5 VIN, 3.3 VOUT
- 83% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
- External bias option for improved efficiency
- Suitable for scalable power supplies
- Pin compatible with:
- LM61440-Q1 (36 V, 4 A, adjustable fSW)
- LM61460-Q1 (36 V, 6 A, adjustable fSW)
- Pin compatible with:
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Description
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 400ms. 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 pseudo-random spread spectrum, adjustable SW node rise time, low-EMI VQFN-HR package featuring low switch node ringing, and 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 the frequency 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, ensures exceptional efficiency across the entire load range.
The LM62440-Q1 is qualified to automotive AEC-Q100 grade 1 and is available in a 14-pin VQFN-HR package with wettable flanks. Electrical characteristics are specified over a junction temperature range of –40°C to +150°C. Find additional resources in the Related Documentation.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | LM62440-Q1 Automotive 3-V to 36-V, 4-A, Low-Noise Synchronous Step-Down datasheet (Rev. B) | May 13, 2020 |
Selection guide | Buck Converter Quick Reference Guide (Rev. B) | Apr. 08, 2021 | |
Technical article | Powering levels of autonomy: a quick guide to DC/DC solutions for SAE autonomy levels | Nov. 18, 2020 | |
Functional safety information | LM62440-Q1 Functional Safety, FIT Rate, and Failure Mode Distribution | Apr. 02, 2020 | |
Technical article | Optimizing flip-chip IC thermal performance in automotive designs | Dec. 11, 2019 | |
Technical article | Minimize the impact of the MLCC shortage on your power application | Mar. 29, 2019 | |
User guide | LM62440-Q1 EVM User's Guide | Jun. 22, 2018 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
Features
- Spread spectrum operation
- Controlled recover from dropout
- Low operating quiescent current
- High efficiency
- Low minimum on-time
- Adjustable rise time
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
VQFN-HR (RJR) | 14 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
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Support & training
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