3-V to 65-V input, 100-mA, step-down power module in 2.8 x 3.7 mm package


Product details


Iout (Max) (A) 0.1 Vin (Min) (V) 3 Vin (Max) (V) 65 Vout (Min) (V) 1.223 Vout (Max) (V) 15 Soft start Fixed Features EMI Tested, Enable, Light Load Efficiency, Overcurrent protection, Power Good Operating temperature range (C) -40 to 125 Iq (Typ) (uA) 10.5 Regulated outputs (#) 1 Duty cycle (Max) (%) 100 Topology Buck, Inverting Buck-Boost, Synchronous Buck open-in-new Find other Buck modules (integrated inductor)

Package | Pins | Size

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  • Wide input voltage range of 3 V to 65 V
  • Output voltage options:
    • Adjustable 1.223 V to 15 V
    • Fixed 3.3 V or 5 V
  • 100-mA output current
  • 10.5-µA quiescent current
  • ±1% internal voltage reference
  • PFM mode of operation
  • –40°C to 125°C ambient temperature range
  • Active slew rate control for low EMI
  • Meets CISPR11 (EN55011) EMI standards
  • Monotonic start-up into prebiased output
  • Power-good flag
  • Precision enable and input UVLO with hysteresis
  • Thermal shutdown protection with hysteresis
  • 2.8-mm x 3.7-mm x 1.9-mm package
  • Create a custom regulator design with the TPSM265R1 using WEBENCH Power Designer
open-in-new Find other Buck modules (integrated inductor)


The TPSM265R1 is a compact, easy-to-use module that operates over a wide input voltage range up to a maximum continuous input voltage of 65 V. The module fully integrates a controller, MOSFETs, and an output inductor. The module is designed to quickly and easily implement a power design in a small PCB footprint. There are two fixed output voltage options, 3.3 V and 5 V, and an adjustable output voltage option that can be adjusted from 1.223 V to 15 V. Each option has a load current rating of 100 mA. The TPSM265R1 operates in Pulse Frequency Modulation (PFM) mode, providing optimal efficiency at light loads. The control scheme does not require loop compensation, providing excellent line and load transient.

Although designed for small size and simplicity, the TPSM265R1 offers many features. Precision enable, adjustable UVLO, and hysteresis allow for specific power-up and power-down requirements. Selectable/adjustable start-up timing options include minimum delay (no soft start), internally fixed (900 µs), and externally programmable soft start via an external capacitor. An open-drain PGOOD indicator can be used for sequencing and output voltage monitoring. The very small 2.8-mm × 3.7-mm × 1.9-mm package is a good fit for space-constrained applications.

open-in-new Find other Buck modules (integrated inductor)

Technical documentation

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Type Title Date
* Data sheet TPSM265R1 65-V Input, 100-mA Power Module with Ultra-Low IQ datasheet (Rev. B) Dec. 09, 2020
Application note Soldering Considerations for Power Modules (Rev. B) May 17, 2021
Application note Bang for your Buck-An Intro to Buck Converter vs. Buck Power Module Comparison Aug. 28, 2020
Technical article Choosing buck converters and LDOs for miniature industrial automation equipment: what to consider Jan. 29, 2020
Application note Practical Thermal Design With DC/DC Power Modules (Rev. A) Nov. 20, 2019
Technical article Powering tiny industrial automation control equipment with high-voltage modules: how to ensure reliability Nov. 05, 2019
Application note Inverting Application for the TPSM265R1 Jun. 12, 2019
User guide Using the TPSM265R1 EVM Document Type EVM User's Guide May 14, 2019

Design & development

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Hardware development

document-generic User guide
The TPSM265R1 evaluation board is configured to evaluate the operation of the TPSM265R1 power module for current up to 100 mA. The input voltage range is 3 V to 65 V. The output voltage range is 1.223 V to 15 V. The evaluation board makes it easy to evaluate the TPSM265R1 operation.
  • 3-V to 65-V input voltage range
  • Up to 100 mA of output current
  • 1.223-V to 15-V output voltage
  • 2.8-mm x 3.7-mm QFN package

Design tools & simulation

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