Automotive qualified SIMPLE SWITCHER 4-V to 36-V, 1-A synchronous step-down converter


Product details


Vin (Min) (V) 4 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 28 Iout (Max) (A) 1 Iq (Typ) (uA) 80 Switching frequency (Min) (kHz) 2100 Switching frequency (Max) (kHz) 2100 Features Enable, Fixed Output, Forced PWM, Light Load Efficiency, Over Current Protection, Synchronous Rectification Operating temperature range (C) -40 to 150 Rating Automotive Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

SOT-23 (DBV) 6 5 mm² 2.9 x 1.6 open-in-new Find other Buck converters (integrated switch)


  • AEC-Q100 qualified
    • Temperature grade 1: –40°C to 125°C ambient operating temperature range
  • Functional Safety-Capable
  • Configured for rugged automotive applications
    • Input voltage range: 4 V to 36 V
    • 1-A continuous output current
    • Minimum switching-on time: 60 ns
    • 2.1-MHz fixed switching frequency
    • Junction temperature range: –40°C to 150°C
    • 98% maximum duty cycle
    • Monotonic start-up with pre-biased output
    • Internal short circuit protection with hiccup mode
    • ±1% tolerance voltage reference
    • Precision enable
  • Small solution size and ease of use
    • Integrated synchronous rectification
    • Internal compensation for ease of use
    • SOT-23-6 package
  • Pin-to-pin compatible with TPS560430-Q1
  • Various options in pin-to-pin compatible package
    • PFM and forced PWM (FPWM) options
    • Fixed 3.3-V and 5.0-V output option
  • Create a custom design using the LMR50410-Q1 with the WEBENCH Power Designer
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The LMR50410-Q1 is a wide-VIN, easy-to-use synchronous buck converter capable of driving up to 1-A load current. With a wide input range of 4 V to 36 V, the device is suitable for a wide range of automotive applications for power conditioning from an unregulated source.

The LMR50410-Q1 operates at 2.1-MHz switching frequency to support use of relatively small inductors for an optimized solution size. It has an PFM version to realize high efficiency at light load and FPWM version to achieve constant frequency, and small output voltage ripple over the full load range. Soft-start and compensation circuits are implemented internally which allows the device to be used with minimum external components.

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 LMR50410-Q1 is available in SOT-23-6 package.

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Technical documentation

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Type Title Date
* Data sheet LMR50410-Q1 SIMPLE SWITCHER® 4-V to 36-V, 1-A Buck Converter in SOT-23-6 Pack datasheet (Rev. A) Nov. 13, 2020
Functional safety information LMR50410-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. A) Oct. 16, 2020
Certificate LMR50410QEVM EU Declaration of Conformity (DoC) Jul. 22, 2020
User guide LMR50410QEVM User's Guide Jul. 21, 2020
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019

Design & development

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Hardware development

document-generic User guide
The LMR50410QEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMR50410-Q1 step-down converter. The board is set as a 3.3-V Vout. The board also has AC signal injection terminals for loop measurements.
  • 4-V to 36-V input voltage range
  • Accurate 3.3-V output
  • Up to 1-A output current
  • 2100-kHz switching Frequency

Design tools & simulation

SLUM747.ZIP (99 KB) - PSpice Model
SLUM767.ZIP (140 KB) - PSpice Model
SLUM770.ZIP (507 KB) - PSpice Model
SLUM772.ZIP (262 KB) - PSpice Model
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  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
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CAD/CAE symbols

Package Pins Download
SOT-23 (DBV) 6 View options

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