TPS40400 Step-Down Regulator with PMBus Delivering 1.8V at 4A Reference Design
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Key Document


PMP11140 is a single-phase switching regulator accepting an input range of 4.5V to 13.2V and providing an output voltage of 1.8V capable of supplying 4A of current. This reference design shows 1.8Vout, 4A (3A without a fan) for CPU I/O and other applications in a 22cm by 12.6cm single sided footprint. A rich test interface including an on board dynamic load is provided.

  • PMBus programming, configuration, control, and telemetry
  • 85% peak efficiency
  • Well documented thermal performance both with and without fan.
  • On board high speed dynamic test load to verify dynamic performance
  • 0.9” x 0.5” total power supply area with all parts on same side
  • Supported by TI’s Fusion GUI PMBus designer FUSION_DIGITAL_POWER_DESIGNER

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(Output Voltage 1)
Vin (Min) (V)4.5
Vin (Max) (V)13.2
Vout (Nom) (V)1.8
Iout (Max) (A)4
Output Power (W)7.2
Input TypeDC
TopologyBuck- Synchronous
Designed forProcessor

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD17313Q2  30V, N ch NexFET MOSFET™, single SON2x2, 32mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
CSD85301Q2  20V, N ch NexFET MOSFET™, dual SON2x2, 27mOhm  MOSFETs  Sample & Buy Not Available
TPS40400  3.0V - 20V, 30A, Synchronous Buck Controller with PMBus™, including Telemetry  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD17313Q2 WSON (DQK)| 6 Download -
CSD85301Q2 WSON (DQK)| 6 Download Download
TPS40400 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 2176 15 Jul 2015
Design files (5)
Title Type Size (KB) Date
ZIP 385 15 Jul 2015
PDF 1381 15 Jul 2015
PDF 173 15 Jul 2015
PDF 116 15 Jul 2015
PDF 196 15 Jul 2015

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