3.3-V, 1-A, Cost-Effective, Single-Layer TO-247 LDO Replacement Reference Design With 91% 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 Files

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(Output Voltage 1)
Vin (Min) (V)6.5
Vin (Max) (V)17
Vout (Nom) (V)3.3
Iout (Max) (A)1
Output Power (W)3.3
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) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

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

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 2564 17 Aug 2017
Design files (6)
Title Type Size (KB) Date
ZIP 38 17 Aug 2017
ZIP 462 17 Aug 2017
PDF 202 17 Aug 2017
PDF 57 17 Aug 2017
PDF 194 17 Aug 2017
PDF 153 17 Aug 2017
Related Tools & Software

Reference Designs (3)

Design tools & simulation (1)

Name Part Number Tool Type
SPICE-based analog simulation program  TINA-TI  Simulation tool 

Models (1)

Title Category Type Size (KB) Date Views
TIDA-01447 Simulation TINA-TI Reference Design ZIP 72 KB 25 May 2018

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