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LMR36520

ACTIVE

SIMPLE SWITCHER® 4.2-V to 65-V, 2-A synchronous step-down converter with 26-uA IQ

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Data sheet

LMR36520

ACTIVE
Data sheet Order now

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck, Flybuck Type Converter Iout (max) (A) 2 Vin (min) (V) 4.2 Vin (max) (V) 65 Switching frequency (min) (kHz) 340 Switching frequency (max) (kHz) 460 Features Enable, Light Load Efficiency, Over Current Protection, Power good, Soft Start Fixed, UVLO Fixed Control mode current mode Vout (min) (V) 1 Vout (max) (V) 62 Iq (typ) (µA) 26 Duty cycle (max) (%) 98
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck, Flybuck Type Converter Iout (max) (A) 2 Vin (min) (V) 4.2 Vin (max) (V) 65 Switching frequency (min) (kHz) 340 Switching frequency (max) (kHz) 460 Features Enable, Light Load Efficiency, Over Current Protection, Power good, Soft Start Fixed, UVLO Fixed Control mode current mode Vout (min) (V) 1 Vout (max) (V) 62 Iq (typ) (µA) 26 Duty cycle (max) (%) 98
HSOIC (DDA) 8 29.4 mm² 4.9 x 6
  • Designed for reliable and rugged applications
    • Input transient protection up to 70 V
    • Protection features: thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, hiccup short-circuit protection
  • Well-suited for scalable industrial power supplies
    • Pin compatible with:
    • Internal compensation helps reduce solution size, cost and design complexity
    • 400-kHz frequency
  • Wide conversion range
    • Input voltage range: 4.2 V to 65 V
    • Output voltage range: 1 V to 95% of VIN
  • Low-power dissipation across load spectrum
    • 90% efficiency: 24 VIN, 5 VOUT, 1 A at 400 kHz
    • Increased light-load efficiency in PFM mode
    • Low operating quiescent current of 26 µA
  • Power-good output with filter and delayed release
  • Designed for reliable and rugged applications
    • Input transient protection up to 70 V
    • Protection features: thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, hiccup short-circuit protection
  • Well-suited for scalable industrial power supplies
    • Pin compatible with:
    • Internal compensation helps reduce solution size, cost and design complexity
    • 400-kHz frequency
  • Wide conversion range
    • Input voltage range: 4.2 V to 65 V
    • Output voltage range: 1 V to 95% of VIN
  • Low-power dissipation across load spectrum
    • 90% efficiency: 24 VIN, 5 VOUT, 1 A at 400 kHz
    • Increased light-load efficiency in PFM mode
    • Low operating quiescent current of 26 µA
  • Power-good output with filter and delayed release

The LMR36520 regulator is an easy-to-use, synchronous, step-down DC/DC SIMPLE SWITCHER converter. With integrated high-side and low-side power MOSFETs, output current up to 2 A is delivered over a wide input voltage range of 4.2 V to 65 V. The transient tolerance that goes up to 70 V reduces the solution size and cost to protect against overvoltages and meets the surge immunity requirements of IEC 61000-4-5.

The LMR36520 uses peak-current mode control to provide optimal efficiency and output voltage accuracy. Precision enable gives 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 requirement for an external supervisor.

Integration and internal compensation eliminates many external components and provides a pinout designed for a simple PCB layout. The feature set of the device is designed to simplify implementation for a wide range of end equipment. The LMR36520 is pin-to-pin compatible with the LMR36510 (65 V, 1 A) and LMR33610, LMR33620, LMR33630 and LMR33640 (36 V, 1 A/2 A/3 A/4 A), completing the latest family of SIMPLE SWITCHER converters. This increases the ease of use and scalability of wide Vin converters across various commonly used voltage and current ratings without having the need to redesign the board layout. As a result, the overall cost, design effort and time to market are optimized.

The LMR36520 is in an 8-pin HSOIC package.

The LMR36520 regulator is an easy-to-use, synchronous, step-down DC/DC SIMPLE SWITCHER converter. With integrated high-side and low-side power MOSFETs, output current up to 2 A is delivered over a wide input voltage range of 4.2 V to 65 V. The transient tolerance that goes up to 70 V reduces the solution size and cost to protect against overvoltages and meets the surge immunity requirements of IEC 61000-4-5.

The LMR36520 uses peak-current mode control to provide optimal efficiency and output voltage accuracy. Precision enable gives 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 requirement for an external supervisor.

Integration and internal compensation eliminates many external components and provides a pinout designed for a simple PCB layout. The feature set of the device is designed to simplify implementation for a wide range of end equipment. The LMR36520 is pin-to-pin compatible with the LMR36510 (65 V, 1 A) and LMR33610, LMR33620, LMR33630 and LMR33640 (36 V, 1 A/2 A/3 A/4 A), completing the latest family of SIMPLE SWITCHER converters. This increases the ease of use and scalability of wide Vin converters across various commonly used voltage and current ratings without having the need to redesign the board layout. As a result, the overall cost, design effort and time to market are optimized.

The LMR36520 is in an 8-pin HSOIC package.

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Technical documentation

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Type Title Date
* Data sheet LMR36520 4.2-V to 65-V, 2-A Ultra-small Synchronous Step-down Converter datasheet (Rev. B) 09 Apr 2020
Design guide High-Efficiency 24-VAC to 5-V, 3.3-V Ref Design With Battery Backup and Charging PDF | HTML 30 Jun 2023
Application note Designing an Isolated Buck (Fly-BuckTM) Converter using the LMR36520 (Rev. A) PDF | HTML 19 Jul 2022
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Certificate LMR36520AEVM EU Declaration of Conformity (DoC) 06 May 2020
Technical article 3 tips when designing a power stage for servo and AC drives PDF | HTML 20 Nov 2019
EVM User's guide LMR36520AEVM User’s Guide 24 Jun 2019
Technical article How to increase system reliability and simplify design using DC/DC converters PDF | HTML 13 Jun 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LMR36520AEVM — SIMPLE SWITCHER® 4.2-V to 65-V, 2-A synchronous step-down converter with 26-uA IQ evaluation mod

The LMR36520AEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMR36520 synchronous step-down converter.

User guide: PDF
Not available on TI.com
Simulation model

LMR36520A PSpice Unencrypted Transient Model (Rev. A)

SNVMBX7A.ZIP (185 KB) - PSpice Model
Download
Simulation model

LMR36520FA PSpice Unencrypted Transient Model (Rev. A)

SNVMBX8A.ZIP (188 KB) - PSpice Model
Download
Reference designs

TIDA-010932 — 24-VAC power stage reference design with battery backup

This reference design provides a high efficiency power stage solution for smart thermostats and other gateway building automation end equipment using a 24 VAC power source. This power stage takes a 24-VAC input and produces a 5 V and 3.3 V output rail, which can power additional point-of-load (...)
Design guide: PDF
Reference designs

PMP22822 — 2.2-W multi-output flybuck reference design

This reference design is a 2.2-W multi-output flybuck solution for isolated gate drive bias supplies. The supply is designed to accept input from 24-V systems. This design uses the LM36520 synchronous buck converter to generate four isolated outputs. Primary side regulation maintains each of the (...)
Test report: PDF
Reference designs

TIDA-010052 — Safety power supply for motor drives reference design

This reference design implements a safe-power supply for powering up microcontrollers in an architecture featuring two MCUs. The design has several protection features including overvoltage protection and short circuit protection to prevent the MCUs from getting damaged. The DC/DCs, LMR36515 and (...)
Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
HSOIC (DDA) 8 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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