Calculation tool
LMR38020-DESIGN-CALC — LMR38020 Quick Start Design Calculator
Quickstart Calculator for the LMR38020 and LMR38020-Q1 devices
LMR38020
- Functional Safety-Capable
- Configured for rugged industrial applications
- 4.2-V to 80-V input voltage range
- 2-A continuous output current
- Ultra-low 40-µA operating quiescent current
- > 1.5-mm distance between VIN and GND pin
- 200-kHz to 2.2-MHz adjustable switching frequency
- Frequency synchronization to external clock
- Spread spectrum option for reduced EMI
- 97% maximum duty cycle
- Support start-up with pre-biased output
- ±1.0% tolerance voltage reference at room temperature
- Precision enable
- Easy to use device with integrated compensation network enabling low BOM count
- Integrated synchronous rectification
- 8-pin HSOIC with PowerPAD™ integrated circuit package
- PFM and forced PWM (FPWM) options
- Available in 1-A, LMR38010
- Create a custom design using the LMR38020 with the WEBENCH Power Designer
The LMR38020 synchronous buck converter is designed to regulate over a wide input voltage range, minimizing the need for external surge suppression components. The LMR38020 operates during input voltage dips as low as 4.2 V, at nearly 100% duty cycle if needed, making the device an excellent choice for wide input industrial applications and MHEV/EV systems.
The LMR38020 uses precision enable to provide flexibility by enabling a direct connection to the wide input voltage or precise control over device start-up and shutdown. The power-good flag, with built-in filtering and delay, offers a true indication of system status, eliminating the need for an external supervisor. The device incorporates pseudorandom spread spectrum for minimal EMI and switching frequency can be configured 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.
The device has built-in protection features such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation. The LMR38020 is available in an 8-pin HSOIC PowerPAD integrated circuit package.
Technical documentation
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Evaluation board
LMR38020EVM — LMR38020 evaluation module SIMPLE SWITCHER 80-V, 2-A, 2.2-MHz step-down converter with 40-uA IQ
The LMR38020EVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMR38020F step-down converter. The board has jumper connector to indicate POWERGOOD flag and sync to external clock. The board also has AC signal injection terminals for loop measurements.
Evaluation board
LMR38020QEVM — LMR38020-Q1 evaluation module SIMPLE SWITCHER® power converter 80-V, 2-A, synchronous buck, 40-µA IQ
The LM38020QEVM evaluation module (EVM) uses the LMR38020S-Q1, a 80-V DC/DC buck regulator that employs synchronous rectification to achieve high conversion efficiency in a small footprint. The EVM operates over a wide input voltage range of 6 V to 80 V to provide a regulated 5-V output at 400-kHz (...)
Reference designs
TIDA-010950 — Damper and EEV controller Reference Design with power regulation and Hall-effect position sensing
This reference design demonstrates a dual motor drive solution for damper actuators and electronic expansion valves . The multiple motor drives include one bipolar stepper motor driver, one brushless DC motor driver, operating from a 15VDC source. The design shows accurate power limiting that helps (...)
Design guide: PDF
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HSOIC (DDA) | 8 | Ultra Librarian |
Ordering & quality
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