3-V to 28-V, synchronous peak current mode buck controller for notebook power in RSN/RTV package

A newer version of this product is available
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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
TPS51124 ACTIVE 4.5-V to 28-V, dual-synchronous buck controller for low output voltage rails This upgraded product offers a smaller 4x4mm QFN package and fewer external components.

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 Operating temperature range (C) -40 to 85 Regulated outputs (#) 2 Number of Phases 1 Rating Catalog open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

WQFN (RSN) 32 16 mm² 4 x 4 WQFN (RTV) 32 25 mm² 5 x 5 open-in-new Find other Buck controllers (external switch)


  • 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
    • Notebook Computer System and I/O Bus
    • Point of Load in LCD TV, MFP

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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
* Datasheet Fixed-Frequency 99% Duty Cycle Peak Current-Mode Notebook System Pwr Controller datasheet (Rev. E) Jan. 21, 2013
Application note Non-Isolated Point-of-Load Solutions for Tiger Lake in PC Applications (Rev. A) May 21, 2020
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note Independent Rail Dual Buck Converter using TPS51220 Nov. 22, 2013
User guide High-Performance Synchronous Buck EVM Using the TPS51220 (Rev. A) May 12, 2011
Technical article Embedded Computers with TI Power in a myriad of applications May 15, 2010

Design & development

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Hardware development

document-generic User guide
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 (...)
  • Input Range from 8 V to 20 V
  • Dual 8-A Outputs, 3.3 V and 5 V
  • Individual Enable Function for 3.3-V and 5-V Output
  • Selectable Light Load Operation
  • Selectable Control Architecture
  • Inductor Current Sensing
  • OVP Disable Function
  • Output Discharge Disable Function
  • Test Points for Easy Access to Measure Key (...)

Design tools & simulation

SLIM156B.ZIP (57 KB) - PSpice Model
SLIM157A.ZIP (102 KB) - PSpice Model
SLUM360.TSC (837 KB) - TINA-TI Reference Design
SLUM361.ZIP (7 KB) - TINA-TI Spice Model
SLUM364.TSC (1120 KB) - TINA-TI Reference Design
SLUM365.ZIP (115 KB) - TINA-TI Spice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
QFN (RSN) 32 View options
WQFN (RTV) 32 View options

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