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TPS56121

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

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

TPS56121

ACTIVE
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Product details

Parameters

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 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

LSON-CLIP (DQP) 22 30 mm² 6 x 5 open-in-new Find other Buck converters (integrated switch)

Features

  • 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
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Description

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

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
1999
Description

The AFE7422 evaluation module (EVM) is an RF-sampling transceiver platform that can be configured to support up to two-transmit and two-receive (2T2R) channels simultaneously. The module evaluates the AFE7422 device, which is a dual-channel RF-sampling analog front end (...)

Features
  • Allows evaluation of 4T4R RF-sampling AFE7422 solutions
  • JESD204B data interface to simplify digital interface; compliant up to 15-Gbps lane rates
  • Supports JESD204B subclass 1 for synchronization and compatibility
  • Option for DC-DC-based LDO-less power-management solution
  • Onboard clocking solution (...)
View details
EVALUATION BOARD Download
document-generic User guide
1999
Description

The AFE7444 evaluation module (EVM) is an RF-sampling transceiver platform that can be configured to support up to four-transmit and four-receive (4T4R) channels simultaneously. The module evaluates the AFE7444 device, which is a quad-channel RF-sampling analog front end (...)

Features
  • Allows evaluation of 4T4R RF-sampling AFE7444 solutions
  • JESD204B data interface to simplify digital interface; compliant up to 15-Gbps lane rates
  • Supports JESD204B subclass 1 for synchronization and compatibility
  • Option for DC-DC-based LDO-less power-management solution
  • Onboard clocking solution (...)
View details
EVALUATION BOARD Download
document-generic User guide
49
Description
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 (...)
Features
  • 8V to 14V Input Voltage Rating
  • 1.0V ±2% Output Voltage Rating
  • 15A Steady State Load Current
  • 500kHz Switching Frequency
  • Simple Access to IC features (Power Good, Enable, Soft-Start, Error Amplifier)
View details

Design tools & simulation

SIMULATION MODEL Download
SLUM139A.ZIP (100 KB) - PSpice Model
SIMULATION MODEL Download
SLUM143.TSC (900 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLUM144.TSC (900 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLUM145.ZIP (80 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SLUM235A.ZIP (449 KB) - PSpice Model
SIMULATION MODEL Download
SLUM280.TSC (1202 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLUM281.ZIP (7 KB) - TINA-TI Spice Model
SIMULATION TOOL Download
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 (...)
Features
  • 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
  • (...)
View details
CALCULATION TOOL Download
SLUC263E.ZIP (185 KB)

Reference designs

REFERENCE DESIGNS Download
Xilinx Kintex FPGA Power Reference Design
PMP6776 — 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 (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
LSON-CLIP (DQP) 22 View options

Ordering & quality

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  • Ongoing reliability monitoring

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