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TPS56121

ACTIVE

4.5-V to 14-V, 15-A synchronous SWIFT™ buck converter

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Data sheet

TPS56121

ACTIVE
Data sheet Order now

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 15 Vin (min) (V) 4.5 Vin (max) (V) 14 Switching frequency (min) (kHz) 300 Switching frequency (max) (kHz) 1000 Features Adjustable current limit, Enable, Forced PWM, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, UVLO Fixed Control mode Voltage mode Vout (min) (V) 0.6 Vout (max) (V) 12 Iq (typ) (µA) 2500 Duty cycle (max) (%) 93
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 15 Vin (min) (V) 4.5 Vin (max) (V) 14 Switching frequency (min) (kHz) 300 Switching frequency (max) (kHz) 1000 Features Adjustable current limit, Enable, Forced PWM, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, UVLO Fixed Control mode Voltage mode Vout (min) (V) 0.6 Vout (max) (V) 12 Iq (typ) (µA) 2500 Duty cycle (max) (%) 93
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) PDF | HTML 09 Feb 2016
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 25 Mar 2024
Analog Design Journal Control-Mode Quick Reference Guide (Rev. B) PDF | HTML 29 Aug 2023
Analog Design Journal 2단계 필터를 사용하여 전압 리플 감소 PDF | HTML 03 May 2023
Analog Design Journal 使用第二級濾波器來減少電壓漣波 PDF | HTML 03 May 2023
Analog Design Journal Using a second stage filter to reduce voltage ripple PDF | HTML 10 Jan 2023
EVM User's guide TPS56121 Step-Down Converter Evaluation Module User's Guide (Rev. C) PDF | HTML 02 Aug 2021
Application note Calculating Efficiency (Rev. A) 06 Mar 2020
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
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

TPS56121EVM-601 — Evaluation Module for TPS56121 High Current (15A) Synchronous Step-Down SWIFT™ Converter

The Texas Instruments TPS56121EVM-601 evaluation module (EVM) helps designers evaluate the operation and performance of the TPS56121 4.5V to 14V Input, 15A High Current Synchronous Step-Down Converter. The EVM is designed to use a regulated 12V (8V to 14V) bus voltage to provide a regulated 1.0-V (...)
User guide: PDF | HTML
Not available on TI.com
Simulation model

TPS56121 TINA TI Start-Up Reference Design

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

TPS56121 TINA-TI Average Reference Design

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

TPS56121 TINA-TI Average Spice Model

SLUM281.ZIP (7 KB) - TINA-TI Spice Model
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Simulation model

TPS56121 TINA-TI Steady State Reference Design

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

TPS56121 TINA-TI Transient Spice Model

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

TPS56121 Unencrypted PSpice Transient Model Package (Rev. A)

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

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

SLUM235A.ZIP (449 KB) - PSpice Model
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Calculation tool

SLUC263 — Type III Compensation Calculation Tool

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
TPS40007 — 2.25V-5.5V, 300 kHz, Synchronous Buck Controller, Source/ Sink, Prebias Operation TPS40009 — 2.25V-5.5V, 600 kHz, Synchronous Buck Controller, Source/ Sink, Prebias Operation TPS40021 — Enhanced Low Input (2.25V-5.5V) up to 1MHz Frequency, Sync. Buck Controller, source/sink TPS40040 — 2.25 to 5.5 V input, 300 kHz, synchronous buck controller with low pin count TPS40041 — 2.25 to 5.5 V input, 600 kHz, synchronous buck controller with low pin count TPS40055 — Wide Input (8V-40V) up to 1MHz Frequency Synchronous Buck Controller, source/sink TPS40057 — Wide Input (8V-40V) up to 1MHz Frequency Synchronous Buck Controller, source/sink with prebias TPS40075 — 4.5-V to 28-V, synchronous buck controller with voltage feed forward TPS40077 — 4.5-V to 28-V, synchronous buck controller with voltage feed forward in HTSSOP package TPS40101 — 4.5-V to 18-V, synchronous buck controller with advanced sequencing and output margining TPS40170 — 4.5 V to 60 V Wide-Input Synchronous PWM Buck Controller TPS40190 — 4.5-V to 15-V, 20-A synchronous buck controller TPS40192 — 4.5-V to 18-V, 20-A, 600-kHz synchronous buck controller with power good TPS40193 — 4.5-V to 18-V, 20-A, 300-kHz synchronous buck controller with power good TPS40195 — 4.5-V to 20-V, 20-A, synchronous buck controller with power good and synchronization TPS40200 — Wide Input Non-Synchronous Buck DC/DC Controller TPS40303 — 3-V to 20-V, 25-A, 300-kHz synchronous buck controller with FSS TPS40304 — 3-V to 20-V, 25-A, 600-kHz synchronous buck controller with FSS TPS40305 — 3-V to 20-V, 25-A, 1.2-MHz synchronous buck controller with FSS TPS40322 — Dual Output or Two-phase Synchronous Buck Controller TPS40400 — 3-V to 20-V, 30-A, synchronous buck controller with PMBus™, including Telemetry TPS40422 — Dual Output or Multiphase Synchronous Buck Controller with PMBus TPS5130 — 4.5-V to 28-V, triple synchronous buck controller with LDO controller
AC/DC & DC/DC converters (integrated FET)
TPS53311 — 2.9V to 6V Input, 3A Synchronous Step-Down Converter with Eco-Mode and Smooth PWM TPS53313 — 4.5-V to 16-V, 6-A synchronous buck converter with optimized light load efficiency TPS53316 — High-Efficiency, 5-A Step-Down Regulator with Integrated Switcher TPS56121 — 4.5-V to 14-V, 15-A synchronous SWIFT™ buck converter TPS56221 — 4.5-V to 14-V, 25-A synchronous SWIFT™ buck converter
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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, (...)
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
LSON-CLIP (DQP) 22 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

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