TPS54821

ACTIVE

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

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 8 Vin (min) (V) 4.5 Vin (max) (V) 17 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 1600 Features Enable, Forced PWM, Frequency synchronization, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, Tracking Control mode current mode Vout (min) (V) 0.6 Vout (max) (V) 15 Iq (typ) (µA) 600 Duty cycle (max) (%) 100
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 8 Vin (min) (V) 4.5 Vin (max) (V) 17 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 1600 Features Enable, Forced PWM, Frequency synchronization, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, Tracking Control mode current mode Vout (min) (V) 0.6 Vout (max) (V) 15 Iq (typ) (µA) 600 Duty cycle (max) (%) 100
VQFN (RHL) 14 12.25 mm² 3.5 x 3.5
  • 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
  • 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

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.

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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Design & development

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

Evaluation board

TPS54821EVM-049 — Evaluation Module for TPS54821 Synchronous Step-Down Converter

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

TPS54821 TINA-TI Average Reference Design

SLVM634.TSC (70 KB) - TINA-TI Reference Design
Simulation model

TPS54821 TINA-TI Average Spice Model

SLVM633.ZIP (7 KB) - TINA-TI Spice Model
Simulation model

TPS54821 Unencrypted PSpice Average Model Package (Rev. A)

SLVM427A.ZIP (42 KB) - PSpice Model
Simulation model

TPS54821 Unencrypted PSpice Transient Model Package (Rev. A)

SLVMA95A.ZIP (117 KB) - PSpice Model
Calculation tool

TPS54620DESIGN-CALC TPS54620 and TPS54XXX Current-Mode Step-Down Converter Design Calculator

The Design Calculator Plus Application Note (SLVA352A) Calculator Tool calculates the critical external component values for the TPS54620/TPS54622/TPS54521/TPS54320/TPS54618/TPS54418/TPS54318/TPS54218/TPS54319. The calculator includes power stage design, feature design and Type II and Type III (...)
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
TPS54218 2.95V to 6V Input, 2A Synchronous Step-Down SWIFT™ Converter TPS54318 2.95V to 6V Input, 3A Synchronous Step-Down SWIFT™ Converter TPS54319 2.95 V to 6 V input, 3 A, 2 MHz SWIFT™ synchronous step-down converter in a 3 mm x 3 mm QFN package TPS54320 4.5V to 17V Input, 3A Synchronous Step-Down SWIFT™ Converter TPS54418 2.95V to 6V Input, 4A Synchronous Step-Down SWIFT™ Converter TPS54521 17V Input, 5A Synchronous Step-Down Converter TPS54618 2.95V to 6V Input, 6A, Synchronous Step-Down SWIFT™ Converter TPS54620 4.5-V to 17-V, 6-A synchronous SWIFT™ buck converter TPS54622 4.5-V to 17-V, 6-A synchronous SWIFT™ buck converter with hiccup current limit TPS54821 4.5-V to 17-V, 8-A synchronous buck converter with hiccup current limit TPS56921 4.5-V to 17-V, 9-A synchronous buck converter with VID control
Hardware development
Evaluation board
TPS54418EVM-375 TPS54418 3.3V Input, 1.8V Output, 4A SWIFT™ Evaluation Module TPS54620EVM-374 TPS54620 8V to 17V, 6A SWIFT™ Converter Evaluation Module
Software
Calculation tool
TPS54620DESIGN-CALC TPS54620 & TPS54XXX Current-Mode Step-Down Converter Design Calculator
Reference designs

PMP15043 — 6A, 0.05% Current Accuracy Power Solution for Battery Test Systems Reference Design

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 (...)
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
VQFN (RHL) 14 Ultra Librarian

Ordering & quality

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