4.2-V to 60-V, 1.5-A ultra-small synchronous step-down converter with extended temperature


Product details


Vin (Min) (V) 4.2 Vin (Max) (V) 60 Vout (Min) (V) 1 Vout (Max) (V) 57 Iout (Max) (A) 1.5 Iq (Typ) (uA) 26 Switching frequency (Min) (kHz) 400 Switching frequency (Max) (kHz) 1000 Features Enable, Forced PWM, Light Load Efficiency, Over Current Protection, Power Good, Pre-Bias Start-Up, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable Flanks Package Operating temperature range (C) -55 to 150 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

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VQFN-HR (RNX) 12 6 mm² 3 x 2 open-in-new Find other Buck converters (integrated switch)


  • Functional Safety-Capable
  • Designed for reliable and rugged applications
    • Input transient protection up to 66 V
    • Junction temperature range –55°C to +150°C
    • 0.4-V dropout with 1.5-A load (typical)
  • Suited for scalable industrial power supplies
  • Small, 2-mm × 3-mm HotRod™ package
  • Low power dissipation across load spectrum
    • 90% efficiency at 400 kHz (24 VIN, 5 VOUT, 1 A)
    • 93% efficiency at 400 kHz (12 VIN, 5 VOUT, 1 A)
    • Increased light load efficiency in PFM
    • Low operating quiescent current of 26 µA
  • Solution with few external components
  • Optimized for ultra low EMI requirements
    • Meets CISPR25 class 5 standard
    • HotRod package minimizes switch node ringing
    • Parallel input path minimizes parasitic inductance
    • Spread spectrum reduces peak emissions
  • Create a custom design using the LMR36015S with the WEBENCH Power Designer
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The LMR36015S regulator is an easy-to-use, synchronous, step-down DC/DC converter. With integrated high-side and low-side power MOSFETs, up to 1.5 A of output current is delivered over a wide input voltage range of 4.2 V to 60 V. Tolerance goes up to 66 V. The transient tolerance reduces the necessary design effort to protect against overvoltages and meets the surge immunity requirements of IEC 61000-4-5.

The LMR36015S uses peak-current-mode control to provide optimal efficiency and output voltage accuracy. Load transient performance is improved with FPWM feature in the 1-MHz regulator. 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.

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Technical documentation

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Type Title Date
* Data sheet LMR36015S 4.2-V to 60-V, 1.5-A Ultra-Small Synchronous Step-Down Converter datasheet Jan. 12, 2021
Application note Extended Temperature DC/DC Switching Regulator Solutions Jan. 12, 2021
Functional safety information LMR36015S Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA Jan. 06, 2021
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019

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