5-V, 1-A, Cost-Effective, Dual-Layer TO-220 LDO Replacement Reference Design With 92.5% 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-220 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-220 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-220
  • 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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Schematic/Block Diagram

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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 5169 16 Aug 2017 29
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 294 16 Aug 2017 21
ZIP 1092 16 Aug 2017 38
PDF 210 16 Aug 2017 39
PDF 47 16 Aug 2017 24
PDF 190 16 Aug 2017 30
PDF 75 16 Aug 2017 88
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-01450 Simulation TINA-TI Reference Design ZIP 90 KB 25 May 2018 8 views

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