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) (uA) 4 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 2200 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
Vin (Min) (V) 3 Vin (Max) (V) 65 Vout (Min) (V) 1 Vout (Max) (V) 60 Iout (Max) (A) 0.6 Iq (Typ) (uA) 4 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 2200 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
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)
  • 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)

The LMR36506 is the industry’s smallest 65 V, 0.6 A synchronous step-down DC/DC converter in 2-mm x 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 x 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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Type Title Date
* Data sheet LMR36506 3-V to 65-V, 0.6-AUltra-Small Synchronous Buck Converter with 4 µA IQ datasheet (Rev. A) 23 Dec 2020
Technical article Choosing buck converters and LDOs for miniature industrial automation equipment: what to consider 29 Jan 2020
User guide LMR36506RREVM User’s Guide 03 Apr 2019
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019

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.
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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

LMR36506RF PSpice Unencrypted Transient Model

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

LMR36506R5 PSpice Unencrypted Transient Model

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

LMR36506RF3 PSpice Unencrypted Transient Model

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

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