2.7-V to 6-V, 1-A, fixed-frequency, step-down converter in SOT583 package


Product details


Vin (Min) (V) 2.7 Vin (Max) (V) 6 Vout (Min) (V) 0.6 Vout (Max) (V) 5.5 Iout (Max) (A) 1 Iq (Typ) (uA) 17 Switching frequency (Min) (kHz) 2025 Switching frequency (Max) (kHz) 2475 Features Enable, Forced PWM, Frequency Synchronization, Light Load Efficiency, Output Discharge, Over Current Protection, Power Good, Soft Start Adjustable, Synchronous Rectification, Tracking, UVLO Adjustable Operating temperature range (C) -40 to 150 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

SOT-5X3 (DRL) 8 open-in-new Find other Buck converters (integrated switch)


  • Functional Safety-Capable
  • Input voltage range: 2.7 V to 6 V
  • Output voltage from 0.6 V to 5.5 V
  • 1% feedback voltage accuracy (full temperature range)
  • TJ = –40°C to +150°C
  • Switching frequency in PWM: 2.25 MHz
  • External synchronization from 1.8 MHz to 4 MHz
  • Forced PWM or PWM/PFM operation
  • Quiescent current 17 µA typical
  • Adjustable soft start-up to 10 ms
  • Precise ENABLE input allows:
    • User-defined undervoltage lockout
    • Exact sequencing
  • 100% duty cycle mode
  • Active output discharge
  • Power-good output with window comparator
  • For device options with selectable compensation, see TPS628501
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The TPS62851x is a family of pin-to-pin 0.5-A, 1-A, and 2-A high efficiency, easy-to-use, synchronous step-down DC/DC converters. They are based on a peak current mode control topology. Low resistive switches allow up to 2-A continuous output current. The switching frequency is internally fixed at 2.25 MHz and can also be synchronized to an external clock in the range from 1.8 MHz to 4 MHz. In PWM/PFM mode, the TPS62851x automatically enters Power Save Mode at light loads to maintain high efficiency across the whole load range. The TPS62851x provide a 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 tracking the output voltage to an external source. This allows external sequencing of different supply rails and limits the inrush current during start-up.

The TPS62851xis available in an 8-pin 1.6-mm × 2.1-mm SOT583 package, offering a high power density solution.

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Pin-for-pin with same functionality to the compared device.
NEW TPS628510 ACTIVE 2.7-V to 6-V, 0.5-A, fixed-frequency, step-down converter in SOT583 package Pin-to-pin 0.5-A version.
NEW TPS628512 ACTIVE 2.7-V to 6-V, 2-A, fixed-frequency, step-down converter in SOT583 package Pin-to-pin 2-A version.
Same functionality with different pin-out to the compared device.
NEW TPS628501 ACTIVE 2.7-V to 6-V, 1-A, adjustable-frequency, step-down converter in SOT583 package Device with adjustable switching frequency and compensation of the control loop.

Technical documentation

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Type Title Date
* Data sheet TPS62851x 2.7-V to 6-V, 0.5-A / 1-A / 2-A Step-Down Converter in SOT583 Package datasheet (Rev. A) Mar. 22, 2021
User guide TPS62851xEVM-139 Evaluation Module (Rev. A) Jun. 24, 2021
Application note Improving Efficiency at Higher Loads with High Switching Frequencies Jun. 16, 2021
Functional safety information TPS62851x Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA Mar. 24, 2021
Certificate TPS628511EVM-139 EU Declaration of Conformity (DoC) Jul. 27, 2020
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019

Design & development

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Hardware development

document-generic User guide
The TPS628511EVM-139 evaluation module (EVM) is used to evaluate the TPS62851x device. The TPS62851x device is a high-frequency, synchronous, step-down converter optimized for a small solution size and high efficiency. The devices focus on high-efficiency, step-down conversion over a wide output (...)
  • 2.7-V to 6-V input voltage range
  • Output voltage accuracy +/- 1%
  • 2 A of output current
  • Quiescent current 15-uA typical
  • Active output discharge

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SOT-5X3 (DRL) 8 View options

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