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TPS51397A ACTIVE 4.5-V to 24-V input, 10-A, synchronous step-down regulator Offers a lower IQ and is soft start adjustable with an extended positive operating temperature range in a smaller package.

Product details

Vin (Min) (V) 4.5 Vin (Max) (V) 32 Vout (Min) (V) 1 Vout (Max) (V) 12 Iout (Max) (A) 20 Iq (Typ) (uA) 1300 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 1000 Features Enable, Frequency Synchronization, Light Load Efficiency, Phase Interleaving, Power Good, Synchronous Rectification Regulated outputs (#) 2 Number of phases 1 Rating Catalog
Vin (Min) (V) 4.5 Vin (Max) (V) 32 Vout (Min) (V) 1 Vout (Max) (V) 12 Iout (Max) (A) 20 Iq (Typ) (uA) 1300 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 1000 Features Enable, Frequency Synchronization, Light Load Efficiency, Phase Interleaving, Power Good, Synchronous Rectification Regulated outputs (#) 2 Number of phases 1 Rating Catalog
WQFN (RSN) 32 16 mm² 4 x 4 WQFN (RTV) 32 25 mm² 5 x 5
  • Input Voltage Range: 4.5 V to 32 V
  • Output Voltage Range: 1 V to 12 V
  • Selectable Light Load Operation (Continuous / Auto Skip / Out-Of-Audio Skip)
  • Programmable Droop Compensation
  • Voltage Servo Adjustable Soft Start
  • 200-kHz to 1-MHz Fixed-Frequency PWM
  • Selectable Current/D-CAP Mode Architecture
  • 180° Phase Shift Between Channels
  • Resistor or Inductor DCR Current Sensing
  • Adaptive Zero Crossing Circuit
  • Powergood Output for Each Channel
  • OCL/OVP/UVP/UVLO Protections
    (OVP Disable Option)
  • Thermal Shutdown (Non-Latch)
  • Output Discharge Function (Disable Option)
  • Integrated Boot Strap MOSFET Switch
  • QFN-32 (RTV/RSN) Package
  • APPLICATIONS
    • Notebook Computer System and I/O Bus
    • Point of Load in LCD TV, MFP

  • Input Voltage Range: 4.5 V to 32 V
  • Output Voltage Range: 1 V to 12 V
  • Selectable Light Load Operation (Continuous / Auto Skip / Out-Of-Audio Skip)
  • Programmable Droop Compensation
  • Voltage Servo Adjustable Soft Start
  • 200-kHz to 1-MHz Fixed-Frequency PWM
  • Selectable Current/D-CAP Mode Architecture
  • 180° Phase Shift Between Channels
  • Resistor or Inductor DCR Current Sensing
  • Adaptive Zero Crossing Circuit
  • Powergood Output for Each Channel
  • OCL/OVP/UVP/UVLO Protections
    (OVP Disable Option)
  • Thermal Shutdown (Non-Latch)
  • Output Discharge Function (Disable Option)
  • Integrated Boot Strap MOSFET Switch
  • QFN-32 (RTV/RSN) Package
  • APPLICATIONS
    • Notebook Computer System and I/O Bus
    • Point of Load in LCD TV, MFP

The TPS51220A is a dual synchronous buck regulator controller with two LDOs. It is optimized for 5-V/3.3-V system controller, enabling designers to cost effectively complete 2-cell to 4-cell notebook system power supply. The TPS51220A supports high efficiency, fast transient response, and 99% duty cycle operation. It supports supply input voltage ranging from 4.5 V to 32 V, and output voltages from 1 V to 12 V. Two types of control schemes can be chosen depending on the application. Peak current mode supports stability operation with lower ESR capacitor and output accuracy. The D-CAP mode supports fast transient response. The high duty (99%) operation and the wide input/output voltage range supports flexible design for small mobile PCs and a wide variety of other applications. The fixed frequency can be adjusted from 200 kHz to 1 MHz by a resistor, and each channel runs 180° out-of-phase. The TPS51220A can also synchronize to the external clock, and the interleaving ratio can be adjusted by its duty. The TPS51220A is available in the 32-pin 5×5/4×4 QFN package and is specified from –40°C to 85°C.

The TPS51220A is a dual synchronous buck regulator controller with two LDOs. It is optimized for 5-V/3.3-V system controller, enabling designers to cost effectively complete 2-cell to 4-cell notebook system power supply. The TPS51220A supports high efficiency, fast transient response, and 99% duty cycle operation. It supports supply input voltage ranging from 4.5 V to 32 V, and output voltages from 1 V to 12 V. Two types of control schemes can be chosen depending on the application. Peak current mode supports stability operation with lower ESR capacitor and output accuracy. The D-CAP mode supports fast transient response. The high duty (99%) operation and the wide input/output voltage range supports flexible design for small mobile PCs and a wide variety of other applications. The fixed frequency can be adjusted from 200 kHz to 1 MHz by a resistor, and each channel runs 180° out-of-phase. The TPS51220A can also synchronize to the external clock, and the interleaving ratio can be adjusted by its duty. The TPS51220A is available in the 32-pin 5×5/4×4 QFN package and is specified from –40°C to 85°C.

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Technical documentation

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Type Title Date
* Data sheet Fixed-Frequency 99% Duty Cycle Peak Current-Mode Notebook System Pwr Controller datasheet (Rev. E) 21 Jan 2013
User guide TPS51220A Buck Controller Evaluation Module User's Guide (Rev. B) PDF | HTML 11 Feb 2022
Application note Non-Isolated Point-of-Load Solutions for Tiger Lake in PC Applications (Rev. B) PDF | HTML 29 Apr 2021
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Independent Rail Dual Buck Converter using TPS51220 22 Nov 2013
Technical article Embedded Computers with TI Power in a myriad of applications 15 May 2010

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TPS51220AEVM-476 — High Performance Dual Output Synchronous Buck Evaluation Module using the TPS51220A

This EVM utilizes TI’s TPS51220A in a dual output design. It includes many test points to help the engineer monitor and evaluate the control characteristics of the TPS51220A. The TPS51220A is a dual peak current mode synchronous buck controller with three linear regulators. The EVM also allows the (...)
User guide: PDF | HTML
Not available on TI.com
Simulation model

TPS51220(A) Unencrypted PSpice Average Model Package (Rev. A)

SLIM157A.ZIP (102 KB) - PSpice Model
Simulation model

TPS51220A TINA-TI Average Reference Design

SLUM360.TSC (837 KB) - TINA-TI Reference Design
Simulation model

TPS51220A TINA-TI Average Spice Model

SLUM361.ZIP (7 KB) - TINA-TI Spice Model
Simulation model

TPS51220A TINA-TI Transient Reference Design

SLUM364.TSC (1120 KB) - TINA-TI Reference Design
Simulation model

TPS51220A TINA-TI Transient Spice Model

SLUM365.ZIP (115 KB) - TINA-TI Spice Model
Simulation model

TPS51220A Unencrypted PSpice Transient Model Package (Rev. B)

SLIM156B.ZIP (57 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Package Pins Download
QFN (RSN) 32 View options
WQFN (RTV) 32 View options

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