5-V, 1-A, Cost-Effective, Single-Layer TO-247 LDO Replacement Reference Design With 93% Efficiency


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Key Document


This reference design demonstrates a small solution size, high-efficiency, and low-EMI DC/DC module for LDO replacement in major home appliances. Replacing LDOs with DC/DC modules drastically improves system efficiency, saving on solution size and BOM cost while also eliminating the need for heat sinks. The module takes up the same amount of space as a TO-247 package and is pin-to-pin compatible with the TO-220 LDO, such as UA7805, enabling quick evaluation and reduced time to market. The TPS561201 power converter enables a higher output current and lower power consumption at full-load, low-load, and standby operation. This module is the same size with a TO-247 package and is pin compatible with the TO-220 LDO, enabling a quick evaluation and time to market.

  • 1.1-μA standby current and 423-μA no load current
  • Small form factor: pin-compatible with TO-220 and size compatible with TO-247
  • Less than 35°C increase at full load which eliminates the need of heat sink
  • Reduces onboard DC/DC design complexity, saves R&D time and efforts for switching power supply EMC design (quicker to market)

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Design Guide

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Design Files

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Bill of Materials (BOM)

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(Output Voltage 1)
Vin (Min) (V)6.5
Vin (Max) (V)17
Vout (Nom) (V)5
Iout (Max) (A)1
Output Power (W)5
Input TypeDC
TopologyBuck- Synchronous

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TPS561201  4.5V to 17V Input, 1A Synchronous Step-Down Voltage Regulator in 6-pin SOT-23  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TPS561201 Download

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Technical Documents

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User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 3017 16 Aug 2017 22
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 37 16 Aug 2017 23
ZIP 471 16 Aug 2017 30
PDF 202 16 Aug 2017 25
PDF 57 16 Aug 2017 22
PDF 71 16 Aug 2017 31
PDF 155 16 Aug 2017 52
Related Tools & Software

Reference Designs  ( 3 )

Development Tools (1)

Name Part Number Tool Type
SPICE-Based Analog Simulation Program  TINA-TI  Circuit Design & Simulation 

Models (1)

Title Category Type Size (KB) Date Views
TIDA-01448 Simulation TINA-TI Reference Design ZIP 88 KB 25 May 2018 10 views

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