TPS54821

ACTIVE

4.5-V to 17-V, 8-A synchronous buck converter with hiccup current limit

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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 17 Vout (Min) (V) 0.6 Vout (Max) (V) 15 Iout (Max) (A) 8 Iq (Typ) (uA) 600 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 1600 Features Enable, Frequency Synchronization, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, Forced PWM, Soft Start Adjustable Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

VQFN (RHL) 14 12 mm² 3.5 x 3.5 open-in-new Find other Buck converters (integrated switch)

Features

  • Integrated 26 mΩ / 19 mΩ MOSFETs
  • Split Power Rail: 1.6 V to 17 V on PVIN
  • 200 kHz to 1.6 MHz Switching Frequency
  • Synchronizes to External Clock
  • 0.6V ±1% Voltage Reference Over Temperature
  • Low 2 µA Shutdown Quiescent Current
  • Monotonic Start-Up into Pre-biased Outputs
  • Adjustable Slow Start/Power Sequencing
  • Power Good Output Monitor for Undervoltage and
    Overvoltage
  • Adjustable Input Undervoltage Lockout
  • Software Tools Available
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Description

The TPS54821 in thermally enhanced 3.5 mm × 3.5 mm QFN package is a full featured 17 V, 8 A synchronous step down converter which is optimized for small designs through high efficiency and integrating the high-side and low-side MOSFETs. Further space savings are achieved through current mode control, which reduces component count, and by selecting a high switching frequency, reducing the inductor's footprint.

The output voltage startup ramp is controlled by the SS/TR pin which allows operation as either a stand alone power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and the open drain power good pins.

Cycle by cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current limit which prevents current runaway. There is also a low-side sinking current limit which turns off the low-side MOSFET to prevent excessive reverse current. Hiccup protection will be triggered if the overcurrent condition has persisted for longer than the preset time. Thermal hiccup protection disables the device when the die temperature exceeds the thermal shutdown temperature and enables the part again after the built-in thermal shutdown hiccup time.

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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
NEW TPS543820 ACTIVE 4-V to 18-V, 8-A synchronous SWIFT™ step-down converter Upgraded 8-A converter product offering more efficiency in a smaller package.

Technical documentation

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Type Title Date
* Data sheet TPS54821 4.5 V to 17 V Input, 8 A Synchronous Step Down Converter With Hiccup datasheet (Rev. B) Feb. 10, 2016
Application note How to Design a Simple and Highly Integrated Battery Testing System (Rev. B) Apr. 02, 2019
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
More literature Common Mistakes in DC/DC Converters and How to Fix Them Feb. 14, 2018
User guide TPS54821EVM-049, 8-A, SWIFT(TM) Regulator Evaluation Module Oct. 27, 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
49
Description
The Texas Instruments TPS54821EVM-049 evaluation module (EVM) helps designers evaluate the TPS54821 Synchronous Step-Down SWIFT Converter with Hiccup Overcurrent Protection. The EVM accepts an 8V to 17V input and provides a 3.3V output at 8A. Terminal blocks are provided for input and output (...)
Features
  • Integrated 26 / 19mOhm MOSFETs
  • Split Power Rail: 1.6V to 17V
  • 0.6V Voltage Reference With +/- 1% Accuracy
  • 200kHz to 1.6MHz Switching Frequency
  • Synchronizes to External Clock
  • Low 2uA Shutdown Quiescent Current
  • Monotonic Start-Up into Pre-biased Outputs
  • Overcurrent Protection for Both MOSFETs with Hiccup Mode (...)

Design tools & simulation

SIMULATION MODEL Download
SLVM427A.ZIP (42 KB) - PSpice Model
SIMULATION MODEL Download
SLVM633.ZIP (7 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SLVM634.TSC (70 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLVMA95A.ZIP (117 KB) - PSpice 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
  • (...)
CALCULATION TOOL Download
SLVC219E.ZIP (54 KB)

Reference designs

REFERENCE DESIGNS Download
6A, 0.05% Current Accuracy Power Solution for Battery Test Systems Reference Design
PMP15043 — This reference design circuit introduces a highly accurate, bi-directional current power solution used in battery test systems (BTS). The maximum current capability is 6A with lower than 0.05% full scale accuracy. Controlling through a logic pin, the circuit can be used to charge or discharge a (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RHL) 14 View options

Ordering & quality

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  • Ongoing reliability monitoring

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