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LMR36506

ACTIVE

3-V to 65-V, 0.6-A ultra-small synchronous buck converter with 4 μA IQ

Product details

Vin (min) (V) 3 Vin (max) (V) 65 Vout (min) (V) 1 Vout (max) (V) 60 Iout (max) (A) 0.6 Iq (typ) (mA) 0.004 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 EMI features Low parasitic Hotrod packaging Features Enable, Fixed Output, Forced PWM, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Fixed, Synchronous Rectification, Wettable flanks package Operating temperature range (°C) -40 to 150 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 98 Type Converter
Vin (min) (V) 3 Vin (max) (V) 65 Vout (min) (V) 1 Vout (max) (V) 60 Iout (max) (A) 0.6 Iq (typ) (mA) 0.004 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 EMI features Low parasitic Hotrod packaging Features Enable, Fixed Output, Forced PWM, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Fixed, Synchronous Rectification, Wettable flanks package Operating temperature range (°C) -40 to 150 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 98 Type Converter
VQFN-HR (RPE) 9 4 mm² 2 x 2
  • Designed for rugged industrial applications:
    • Junction temperature range –40°C to +150°C
    • Input transient protection up to 70 V
    • Wide input voltage range: 3.0 V (falling threshold) to 65 V
    • Low EMI and minimized switch node ringing
    • Adjustable fixed output voltage options available
  • Suited for scalable industrial power supplies:
    • Pin compatible with LMR36503 (65 V, 300 mA)
    • Adjustable switching frequency: 200 kHz to 2.2 MHz with RT pin variant
  • Minimized solution size and cost:
    • Highest power density with internal compensation and reduced external component count
    • Ultra-small, 2-mm × 2-mm HotRod™ package with wettable flanks
  • High efficiency across load range with low power dissipation:
    • 93% peak efficiency at 400 kHz (12 VIN, 3.3 VOUT fixed)
    • 90% peak efficiency at 400 kHz (24 VIN, 3.3 VOUT fixed)
  • Ultra-low operating quiescent current at no load
    • 4 µA at 24 VIN to 3.3 VOUT (fixed output option)
  • Use TPSM365R6 module for faster time to market
  • Designed for rugged industrial applications:
    • Junction temperature range –40°C to +150°C
    • Input transient protection up to 70 V
    • Wide input voltage range: 3.0 V (falling threshold) to 65 V
    • Low EMI and minimized switch node ringing
    • Adjustable fixed output voltage options available
  • Suited for scalable industrial power supplies:
    • Pin compatible with LMR36503 (65 V, 300 mA)
    • Adjustable switching frequency: 200 kHz to 2.2 MHz with RT pin variant
  • Minimized solution size and cost:
    • Highest power density with internal compensation and reduced external component count
    • Ultra-small, 2-mm × 2-mm HotRod™ package with wettable flanks
  • High efficiency across load range with low power dissipation:
    • 93% peak efficiency at 400 kHz (12 VIN, 3.3 VOUT fixed)
    • 90% peak efficiency at 400 kHz (24 VIN, 3.3 VOUT fixed)
  • Ultra-low operating quiescent current at no load
    • 4 µA at 24 VIN to 3.3 VOUT (fixed output option)
  • Use TPSM365R6 module for faster time to market

The LMR36506 is the industry’s smallest 65 V, 0.6 A synchronous step-down DC/DC converter in 2-mm × 2-mm HotRod package. This easy-to-use converter can handle input voltage transients up to 70 V, provide excellent EMI performance and support fixed 3.3 V and other adjustable output voltages. The transient tolerance reduces the necessary design effort to protect against input overvoltage and meets the surge immunity requirements of IEC 61000-4-5.

The LMR36506 uses the peak current mode control architecture with internal compensation to maintain stable operation with minimal output capacitance. The LMR36506 with the right resistor selection from the RT pin to ground can be externally programmed to any desired switching frequency of operation over a wide range from 200 kHz to 2.2 MHz. The precision EN/UVLO feature allows precise control of the device during the start-up and shutdown. The power-good flag, with built-in glitch filter and delayed release, offers a true indication of the system status, eliminating the requirement for an external supervisor. The compact solution size and rich feature set of LMR36506 simplifies implementation for a wide range of industrial applications.

The LMR36506 is the industry’s smallest 65 V, 0.6 A synchronous step-down DC/DC converter in 2-mm × 2-mm HotRod package. This easy-to-use converter can handle input voltage transients up to 70 V, provide excellent EMI performance and support fixed 3.3 V and other adjustable output voltages. The transient tolerance reduces the necessary design effort to protect against input overvoltage and meets the surge immunity requirements of IEC 61000-4-5.

The LMR36506 uses the peak current mode control architecture with internal compensation to maintain stable operation with minimal output capacitance. The LMR36506 with the right resistor selection from the RT pin to ground can be externally programmed to any desired switching frequency of operation over a wide range from 200 kHz to 2.2 MHz. The precision EN/UVLO feature allows precise control of the device during the start-up and shutdown. The power-good flag, with built-in glitch filter and delayed release, offers a true indication of the system status, eliminating the requirement for an external supervisor. The compact solution size and rich feature set of LMR36506 simplifies implementation for a wide range of industrial applications.

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Technical documentation

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* Data sheet LMR36506 3-V to 65-V, 0.6-AUltra-Small Synchronous Buck Converter with 4 µA IQ datasheet (Rev. B) PDF | HTML 16 Dec 2022
Application note Bi-polar Fly-Buck-Boost Solution for Analog Output Modules PDF | HTML 10 Oct 2023
Application note Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems (Rev. A) PDF | HTML 26 Jul 2021
Technical article Choosing buck converters and LDOs for miniature industrial automation equipment PDF | HTML 29 Jan 2020
EVM User's guide LMR36506RREVM User’s Guide 03 Apr 2019
Application brief Powering Drones With a Wide VIN DC-DC Converter (Rev. A) 05 Feb 2019
Analog Design Journal Accurately measuring efficiency of ultralow-IQ devices 22 Jan 2014

Design & development

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Evaluation board

LMR36506RREVM — 3-V to 65-V, 0.6-A ultra-small synchronous buck converter evaluation module

The LMR36506RREVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMR36506 synchronous step-down converter.
User guide: PDF
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Simulation model

LMR36506R PSpice Unencrypted Transient Model

SNVMBW4.ZIP (166 KB) - PSpice Model
Simulation model

LMR36506R3 PSpice Unencrypted Transient Model

SNVMBW5.ZIP (151 KB) - PSpice Model
Simulation model

LMR36506R5 PSpice Unencrypted Transient Model

SNVMC50.ZIP (232 KB) - PSpice Model
Simulation model

LMR36506RF PSpice Unencrypted Transient Model

SNVMBW6.ZIP (159 KB) - PSpice Model
Simulation model

LMR36506RF3 PSpice Unencrypted Transient Model

SNVMC51.ZIP (231 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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VQFN-HR (RPE) 9 View options

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