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TPS51220

ACTIVE

3-V to 28-V, synchronous peak current mode buck controller for notebook power

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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) 28 Vout (min) (V) 1 Vout (max) (V) 12 Iout (max) (A) 20 Iq (typ) (mA) 1.3 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 1000 Features Enable, Frequency synchronization, Light Load Efficiency, Phase Interleaving, Power good, Synchronous Rectification Operating temperature range (°C) -40 to 85 Regulated outputs (#) 2 Number of phases 1 Rating Catalog Control mode D-CAP, current mode Type Controller
Vin (min) (V) 4.5 Vin (max) (V) 28 Vout (min) (V) 1 Vout (max) (V) 12 Iout (max) (A) 20 Iq (typ) (mA) 1.3 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 1000 Features Enable, Frequency synchronization, Light Load Efficiency, Phase Interleaving, Power good, Synchronous Rectification Operating temperature range (°C) -40 to 85 Regulated outputs (#) 2 Number of phases 1 Rating Catalog Control mode D-CAP, current mode Type Controller
VQFN (RHB) 32 25 mm² 5 x 5
  • Input Voltage Range: 4.5 V to 28 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
  • 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 (RHB)
  • APPLICATIONS
    • Notebook Computer System and I/O Bus
    • Point of Load in LCD TV, MFP

  • Input Voltage Range: 4.5 V to 28 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
  • 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 (RHB)
  • APPLICATIONS
    • Notebook Computer System and I/O Bus
    • Point of Load in LCD TV, MFP

The TPS51220 is a dual synchronous buck regulator controller with 2 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 TPS51220 supports high efficiency, fast transient response and 99% duty cycle operation. It supports supply input voltage ranging from 4.5 V to 28 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 TPS51220 can also synchronize to the external clock, and the interleaving ratio can be adjusted by its duty. The TPS51220 is available in the 32 pin 5x5 QFN package and is specified from -40°C to 85°C.

The TPS51220 is a dual synchronous buck regulator controller with 2 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 TPS51220 supports high efficiency, fast transient response and 99% duty cycle operation. It supports supply input voltage ranging from 4.5 V to 28 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 TPS51220 can also synchronize to the external clock, and the interleaving ratio can be adjusted by its duty. The TPS51220 is available in the 32 pin 5x5 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 Controlle datasheet (Rev. C) 03 Jul 2009
User guide TPS51220 Buck Controller Evaluation Module User's Guide (Rev. B) PDF | HTML 18 Feb 2022
Application note Mosfet Driver Circuit Design Guide for TPS512xx (Rev. A) 01 Apr 2019
Application note Independent Rail Dual Buck Converter using TPS51220 22 Nov 2013
Application note Intel Core i3, i5, i7 [Arrandale] Reference Design 21 Jul 2010

Design & development

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Evaluation board

TPS51220EVM — TPS51220EVM High Performance Synchronous Buck Using the TPS51220 Evaluation Module

The TPS51220 is a dual peak-current mode, synchronous step-down controller with three low-dropout (LDO) regulators. It is optimized for 5 V/3.3 V notebook system power supplies. A 99% duty cycle operation enables designers to complete Li-ion battery applications from 2-cells to (...)

User guide: PDF | HTML
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Simulation model

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

SLIM157A.ZIP (102 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 (...)
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VQFN (RHB) 32 View options

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