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

TPS51220ARSNR General Description

Targeting the power supply needs of 2-cell to 4-cell notebook systems, the TPS51220A is a dual synchronous buck regulator controller with two LDOs, offering high efficiency and fast transient response. With a wide input voltage range of 4.5 V to 32 V and output voltage range of 1 V to 12 V, this controller provides cost-effective solutions for various applications, supporting stability and accuracy with its peak current mode and rapid transient response with its D-CAP mode. By offering an adjustable fixed frequency, synchronization capability, and interleaving ratio, the TPS51220A ensures customizable operation to meet specific system requirements. Housed in a 32-pin 5×5/4×4 QFN package, this controller is designed to withstand harsh environmental conditions, with a specified temperature range from –40°C to 85°C, ensuring reliable performance in demanding applications

Key Features

  • 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


  • Powering high-performance CPUs in notebook computers, servers, gaming systems, and more
  • Point-of-load power supplies
  • Embedded systems and industrial applications where high power density and efficiency are required
  • Telecom infrastructure equipment
  • High-end graphics cards and FPGA applications


Product Name TPS51220ARSNR Product Type Step-Down Converter
Input Voltage Range 2.5 V to 6 V Output Voltage 0.6 V to (V_IN-0.2 V)
Output Current Up to 2 A Switching Frequency 300 kHz
Operating Temperature -40°C to 85°C Product Category Switching Controllers
Topology Buck Number of Outputs 2 Output
Duty Cycle - Max 99 % Input Voltage 4.5 V to 32 V
Minimum Operating Temperature - 40 C Maximum Operating Temperature + 85 C
Mounting Style SMD/SMT Development Kit TPS51220AEVM-476
Moisture Sensitive Yes Operating Supply Current 1.3 mA
Series TPS51220A Factory Pack Quantity 3000
Subcategory PMIC - Power Management ICs Type Current Mode PWM Controllers
Unit Weight 0.001411 oz

TPS51220ARSNR Equivalent Parts

You may consider these replacement and alternative parts:

Part Number




Part Number:  TPS51218

In-Stock:  9,642


Description:   TPS51218: A similar synchronous buck controller with lower maximum output current (18A)

Part Number:  TPS51216

In-Stock:  7,323


Description:   TPS51216: Another version of the synchronous buck controller with a lower maximum output current (16A)

Part Number:  TPS51123

In-Stock:  8,648


Description:   TPS51123: A similar synchronous buck controller with an integrated MOSFET and lower maximum output current (10A)

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AVAQ determines and packages all devices based on electrostatic discharge (ESD) and moisture sensitivity level (MSL) protection requirements.

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Ratings and Reviews

K**y 05/13/2023

I'm blown away by the speed and efficiency of Avaq's delivery service. The components arrived so quickly, I couldn't believe it.

L**a 12/17/2022

Avaq's delivery speed is unmatched! I ordered these components on a Thursday, and they arrived on Monday. Impressive!

J**n 09/29/2022

These TPS51220ARSNR components from Avaq are exactly what I needed for my project. They work flawlessly, and the price was very reasonable.

K**e 08/19/2022

I've been searching for these components for weeks, and Avaq had them in stock and ready to ship. They arrived quickly, and I couldn't be happier with my purchase.



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In Stock: 6,376

Minimum Order: 1

Qty. Unit Price Ext. Price
1+ $662.237 $662.24
200+ $256.278 $51,255.60
500+ $247.270 $123,635.00
1000+ $242.820 $242,820.00

The prices below are for reference only.