Product details

Vin (Min) (V) 4.5 Vin (Max) (V) 14 Vout (Min) (V) 0.6 Vout (Max) (V) 12 Iout (Max) (A) 15 Iq (Typ) (uA) 2500 Switching frequency (Min) (kHz) 300 Switching frequency (Max) (kHz) 1000 Features Adjustable Current Limit, Enable, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Forced PWM, Soft Start Adjustable, Over Current Protection, UVLO Fixed Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1
Vin (Min) (V) 4.5 Vin (Max) (V) 14 Vout (Min) (V) 0.6 Vout (Max) (V) 12 Iout (Max) (A) 15 Iq (Typ) (uA) 2500 Switching frequency (Min) (kHz) 300 Switching frequency (Max) (kHz) 1000 Features Adjustable Current Limit, Enable, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Forced PWM, Soft Start Adjustable, Over Current Protection, UVLO Fixed Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1
LSON-CLIP (DQP) 22 30 mm² 6 x 5
  • 4.5-V to 14-V Input Voltage Range
  • Incorporates Power Block Technology
  • Up to 15-A Output Current
  • Fixed-Frequency Options of 300 kHz, 500 kHz,
    and 1 MHz
  • High-Side and Low-Side MOSFET RDS(on) Sensing
  • Programmable Soft-Start
  • 600-mV Reference Voltage With 1% Accuracy
  • Voltage Mode Control with Feed-Forward
  • Supports Prebiased Output
  • Thermal Shutdown
  • 22-Pin 5-mm × 6-mm PQFN PowerPAD™ Package
  • For SWIFT Power Products Documentation,
    see http://www.ti.com/swift
  • 4.5-V to 14-V Input Voltage Range
  • Incorporates Power Block Technology
  • Up to 15-A Output Current
  • Fixed-Frequency Options of 300 kHz, 500 kHz,
    and 1 MHz
  • High-Side and Low-Side MOSFET RDS(on) Sensing
  • Programmable Soft-Start
  • 600-mV Reference Voltage With 1% Accuracy
  • Voltage Mode Control with Feed-Forward
  • Supports Prebiased Output
  • Thermal Shutdown
  • 22-Pin 5-mm × 6-mm PQFN PowerPAD™ Package
  • For SWIFT Power Products Documentation,
    see http://www.ti.com/swift

The TPS56121 device is a high-efficiency and high-current synchronous buck converter designed to operate from a supply of 4.5 V to 14 V. The device can produce an output voltage as low as 0.6 V at loads up to 15 A. Integrated NexFET™ Power MOSFETs provide a small footprint and ease of use.

The device implements a voltage-mode control with voltage feed-forward compensation that responds instantly to input voltage change.

The TPS56121 is available in a thermally enhanced 22-pin PQFN (DQP) PowerPAD package.

The device offers design flexibility with a variety of user programmable functions, including soft-start, overcurrent protection (OCP) levels, and loop compensation. OCP levels are programmed by a single external resistor connected from the ILIM pin to the circuit ground. During the initial power-on sequence, the device enters a calibration cycle, measures the voltage at the ILIM pin, and sets an internal OCP voltage level. During operation, the programmed OCP voltage level is compared to the voltage drop across the low-side FET when it is on to determine whether there is an overcurrent condition and then enters a shutdown/restart cycle until the fault is removed.

The TPS56121 device is a high-efficiency and high-current synchronous buck converter designed to operate from a supply of 4.5 V to 14 V. The device can produce an output voltage as low as 0.6 V at loads up to 15 A. Integrated NexFET™ Power MOSFETs provide a small footprint and ease of use.

The device implements a voltage-mode control with voltage feed-forward compensation that responds instantly to input voltage change.

The TPS56121 is available in a thermally enhanced 22-pin PQFN (DQP) PowerPAD package.

The device offers design flexibility with a variety of user programmable functions, including soft-start, overcurrent protection (OCP) levels, and loop compensation. OCP levels are programmed by a single external resistor connected from the ILIM pin to the circuit ground. During the initial power-on sequence, the device enters a calibration cycle, measures the voltage at the ILIM pin, and sets an internal OCP voltage level. During operation, the programmed OCP voltage level is compared to the voltage drop across the low-side FET when it is on to determine whether there is an overcurrent condition and then enters a shutdown/restart cycle until the fault is removed.

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Technical documentation

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Type Title Date
* Data sheet TPS56121 4.5-V to 14-V Input High-Current Synchronous Buck SWIFT™ Converter datasheet (Rev. D) 09 Feb 2016
User guide TPS56121 Step-Down Converter Evaluation Module User's Guide (Rev. C) 02 Aug 2021
Application note Calculating Efficiency (Rev. A) 06 Mar 2020
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Selection guide SWIFT DC/DC Converters Selector Guide (Rev. G) 06 Feb 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Analysis and Design of Input Filter for DC-DC Circuit 27 Nov 2017
Application note An Efficient LDO-less Power Supply Solution for AFE76xx 13 Nov 2017
Selection guide Control-Mode Quick Reference Guide (Rev. A) 14 Sep 2017
Application note Semiconductor and IC Package Thermal Metrics (Rev. C) 19 Apr 2016
Application note Demystifying Type II and Type III Compensators Using Op-Amp and OTA for DC/DC Co 11 Jul 2014
Application note Understanding Thermal Dissipation and Design of a Heatsink 04 May 2011

Design & development

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

Evaluation board

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Evaluation board

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Simulation model

TPS56121 Unencrypted PSpice Transient Model Package (Rev. A)

SLUM139A.ZIP (100 KB) - PSpice Model
Simulation model

TPS56121 TINA TI Start-Up Reference Design

SLUM143.TSC (900 KB) - TINA-TI Reference Design
Simulation model

TPS56121 TINA-TI Steady State Reference Design

SLUM144.TSC (900 KB) - TINA-TI Reference Design
Simulation model

TPS56121 TINA-TI Transient Spice Model

SLUM145.ZIP (80 KB) - TINA-TI Spice Model
Simulation model

TPS56121/221 Unencrypted PSpice Average Model Package (Rev. A)

SLUM235A.ZIP (449 KB) - PSpice Model
Simulation model

TPS56121 TINA-TI Average Reference Design

SLUM280.TSC (1202 KB) - TINA-TI Reference Design
Simulation model

TPS56121 TINA-TI Average Spice Model

SLUM281.ZIP (7 KB) - TINA-TI Spice 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 (...)
Calculation tool

Type III Compensation Calculation Tool (Rev. E)

SLUC263E.ZIP (185 KB)
Reference designs

PMP6776 — Xilinx Kintex FPGA Power Reference Design

PMP6776 is a low-cost non-isolated synchronous buck power supply. This design uses TPS56121 and TPS54620 Synchronous Buck Converters and TPS54425 and TPS54225 Step-Down Switchers to generate 7 outputs. Features include input voltage range 10.8V to 13.2V and outputs 1V at 6A, 1.5V at 4A, 1.8V at 6A, (...)
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LSON-CLIP (DQP) 22 View options

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