Product details

Vin (Min) (V) 2.7 Vin (Max) (V) 6 Vout (Min) (V) 0.6 Vout (Max) (V) 5.5 Iout (Max) (A) 4 Iq (Typ) (uA) 15 Switching frequency (Min) (kHz) 1800 EMI features Low parasitic Hotrod packaging, Spread spectrum Switching frequency (Max) (kHz) 4000 Features Enable, Forced PWM, Frequency Synchronization, Light Load Efficiency, Output Discharge, Over Current Protection, Power Good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, Tracking, UVLO Fixed, Wettable Flanks Package Rating Automotive Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 100
Vin (Min) (V) 2.7 Vin (Max) (V) 6 Vout (Min) (V) 0.6 Vout (Max) (V) 5.5 Iout (Max) (A) 4 Iq (Typ) (uA) 15 Switching frequency (Min) (kHz) 1800 EMI features Low parasitic Hotrod packaging, Spread spectrum Switching frequency (Max) (kHz) 4000 Features Enable, Forced PWM, Frequency Synchronization, Light Load Efficiency, Output Discharge, Over Current Protection, Power Good, Pre-Bias Start-Up, Spread Spectrum, Synchronous Rectification, Tracking, UVLO Fixed, Wettable Flanks Package Rating Automotive Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 100
VQFN-HR (RWY) 9 6 mm² 3 x 2
  • AEC-Q100 qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C TA
  • Functional Safety-Capable
  • Input voltage range: 2.75 V to 6 V
  • Family of 1 A, 2 A, 3 A and 4 A
  • Quiescent current 15-µA typical
  • Output voltage from 0.6 V to 5.5 V
  • Output voltage accuracy ±1% (PWM operation)
  • Adjustable soft start
  • Forced PWM or PWM and PFM operation
  • Adjustable switching frequency of 1.8 MHz to 4 MHz
  • Precise ENABLE input allows
    • User-defined undervoltage lockout
    • Exact sequencing
  • 100% duty cycle mode
  • Active output discharge
  • Spread spectrum clocking - optional
  • Power good output with window comparator
  • Package with wettable flanks
  • AEC-Q100 qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C TA
  • Functional Safety-Capable
  • Input voltage range: 2.75 V to 6 V
  • Family of 1 A, 2 A, 3 A and 4 A
  • Quiescent current 15-µA typical
  • Output voltage from 0.6 V to 5.5 V
  • Output voltage accuracy ±1% (PWM operation)
  • Adjustable soft start
  • Forced PWM or PWM and PFM operation
  • Adjustable switching frequency of 1.8 MHz to 4 MHz
  • Precise ENABLE input allows
    • User-defined undervoltage lockout
    • Exact sequencing
  • 100% duty cycle mode
  • Active output discharge
  • Spread spectrum clocking - optional
  • Power good output with window comparator
  • Package with wettable flanks

The TPS6281x-Q1 is family of pin-to-pin 1-A, 2-A, 3-A, and 4-A synchronous step-down DC/DC converters. All devices offer high efficiency and ease of use. The TPS6281x-Q1 family is based on a peak current mode control topology. The TPS6281x-Q1 is designed for automotive applications such as infotainment and advanced driver assistance systems. Low resistive switches allow up to 4-A continuous output current at high ambient temperature. The switching frequency is externally adjustable from 1.8 MHz to 4 MHz and can also be synchronized to an external clock in the same frequency range. In PWM/PFM mode, the TPS6281x-Q1 automatically enter Power Save Mode at light loads to maintain high efficiency across the whole load range. The TPS6281x-Q1 provide 1% output voltage accuracy in PWM mode which helps design a power supply with high output voltage accuracy. The SS/TR pin allows setting the start-up time or forming tracking of the output voltage to an external source. This allows external sequencing of different supply rails and limiting the inrush current during start-up.

The TPS6281x-Q1 is available in a 3-mm × 2-mm VQFN package with wettable flanks.

The TPS6281x-Q1 is family of pin-to-pin 1-A, 2-A, 3-A, and 4-A synchronous step-down DC/DC converters. All devices offer high efficiency and ease of use. The TPS6281x-Q1 family is based on a peak current mode control topology. The TPS6281x-Q1 is designed for automotive applications such as infotainment and advanced driver assistance systems. Low resistive switches allow up to 4-A continuous output current at high ambient temperature. The switching frequency is externally adjustable from 1.8 MHz to 4 MHz and can also be synchronized to an external clock in the same frequency range. In PWM/PFM mode, the TPS6281x-Q1 automatically enter Power Save Mode at light loads to maintain high efficiency across the whole load range. The TPS6281x-Q1 provide 1% output voltage accuracy in PWM mode which helps design a power supply with high output voltage accuracy. The SS/TR pin allows setting the start-up time or forming tracking of the output voltage to an external source. This allows external sequencing of different supply rails and limiting the inrush current during start-up.

The TPS6281x-Q1 is available in a 3-mm × 2-mm VQFN package with wettable flanks.

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Technical documentation

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Type Title Date
* Data sheet TPS6281x-Q1 2.75-V to 6-V Adjustable-Frequency Step-Down Converter datasheet (Rev. I) PDF | HTML 16 Dec 2021
Application note How to Measure Impedance of a Power Distribution Network of a DC-DC Converter PDF | HTML 20 Jan 2022
Application note Loop Gain Reconstruction of a Step-Down Converter from Output Impedance PDF | HTML 20 Jan 2022
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
EVM User's guide TPS62810EVM-015 Evaluation Module (Rev. A) PDF | HTML 17 Mar 2021
Functional safety information TPS6281x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. C) PDF | HTML 07 Dec 2020
Functional safety information Streamlining Functional Safety Certification in Automotive and Industrial 09 Jun 2020
White paper 簡化汽車及工業領域的功 能安全認證 09 Jun 2020
White paper 자동차 및 산업 분야의 기능적 안전성 인증 간소화 09 Jun 2020
Application note Powering VCCINT_VCU Rail in Xilinx® Zynq®UltraScale+™ Family of Multiprocessors PDF | HTML 08 Jun 2020
Application note Synchronizing DC/DC Converters in a Power Tree 16 Jan 2020
White paper Benefits of a Resistor-to-Digital Converter in Ultra-Low Power Supplies 14 Oct 2019
Analog Design Journal Methods of output-voltage adjustment for DC/DC converters 14 Jun 2019
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Analog Design Journal Understanding 100% mode in low-power DC/DC converters 22 Jun 2018

Design & development

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

Evaluation board

TPS62810EVM-015 — Buck Converter Evaluation Module

The TPS62810EVM-015 evaluation module (EVM) is designed to help the user easily evaluate and test the operation and functionality of the TPS6281X-Q1 automotive step-down converter family. The EVM converts a 2.7-V to 6.0-V input voltage to a regulated 1.8-V output voltage that delivers up to 4 A.

User guide: PDF | HTML
Not available on TI.com
Simulation model

TPS62810-Q1 PSpice Transient Model (Rev. B)

SLVMCS5B.ZIP (126 KB) - PSpice Model
Simulation model

TPS62810-Q1 SIMPLIS Transient and Average Model

SLVMD82.ZIP (483 KB) - SIMPLIS 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 (...)
Reference designs

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Automotive trends are rapidly evolving, and as a result, new domain- and zonal-based gateway architectures are being used to efficiently handle the ever-increasing amount of data coming into and moving throughout the vehicle, and getting sent to the cloud. A properly functioning domain (or zonal) (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP21939 — Four-output synchronous buck reference design for automotive telematics control units

This reference design uses an LM63635-Q1 synchronous buck converter to output either a 3.3-V or 5-V rail. The bus converter switches at 2.1 MHz, and the load converters (TPS62810-Q1) switch at 2.2 MHz. The system is designed for telematics control unit power. Easily configurable jumpers allow (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP30670 — Automotive wide VIN front-end reference design for digital cockpit processing units

This reference design shows a power tree for automotive digital cockpit applications. The LM74700-Q1 provides low-loss reverse polarity protection to the system followed by an input filter. The LM5143-Q1 dual-synchronous buck converter provides a 3.3-V rail, which can support up to 15 A for a (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP21669 — Automotive instrument cluster power reference design with three outputs

This reference design implements an automotive power supply solution for use in analog gauge clusters, hybrid clusters and cluster display systems. It provides 5 volt, 3.3 volt and 1.2 volt outputs suitable for powering all subsystems within an automotive instrument cluster, a cluster display, or (...)
Test report: PDF
Schematic: PDF
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