TPS54521

ACTIVE

17V Input, 5A Synchronous Step-Down Converter

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 5 Vin (min) (V) 4.5 Vin (max) (V) 17 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 900 Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, Tracking Control mode current mode Vout (min) (V) 0.8 Vout (max) (V) 15 Iq (typ) (µA) 600 Duty cycle (max) (%) 98
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 5 Vin (min) (V) 4.5 Vin (max) (V) 17 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 900 Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, Tracking Control mode current mode Vout (min) (V) 0.8 Vout (max) (V) 15 Iq (typ) (µA) 600 Duty cycle (max) (%) 98
VQFN (RHL) 14 12.25 mm² 3.5 x 3.5
  • Integrated 57mΩ / 50mΩ MOSFETs
  • Split Power Rail: 1.6V to 17V on PVIN
  • 200kHz to 900kHz Switching Frequency
  • Synchronizes to External Clock
  • 0.8V Voltage Reference
  • Low 2µA Shutdown Quiescent Current
  • Hiccup Overcurrent Protection
  • Monotonic Start-Up into Prebiased Outputs
  • –40°C to 125°C
    Operating Junction Temperature Range
  • Pin-to-Pin Compatible with the TPS54620
  • Adjustable Slow Start/Power Sequencing
  • Power Good Output for Undervoltage and
    Overvoltage Monitoring
  • Adjustable Input Undervoltage Lockout
  • Supported by SwitcherPro Software Tool
  • APPLICATIONS
    • Flat Panel Digital TVs
    • Set Top Boxes, Personal Video Recorders
    • Net Books
    • High Density 3.3V/5V Power Distribution
      from 12 V Bus

  • Integrated 57mΩ / 50mΩ MOSFETs
  • Split Power Rail: 1.6V to 17V on PVIN
  • 200kHz to 900kHz Switching Frequency
  • Synchronizes to External Clock
  • 0.8V Voltage Reference
  • Low 2µA Shutdown Quiescent Current
  • Hiccup Overcurrent Protection
  • Monotonic Start-Up into Prebiased Outputs
  • –40°C to 125°C
    Operating Junction Temperature Range
  • Pin-to-Pin Compatible with the TPS54620
  • Adjustable Slow Start/Power Sequencing
  • Power Good Output for Undervoltage and
    Overvoltage Monitoring
  • Adjustable Input Undervoltage Lockout
  • Supported by SwitcherPro Software Tool
  • APPLICATIONS
    • Flat Panel Digital TVs
    • Set Top Boxes, Personal Video Recorders
    • Net Books
    • High Density 3.3V/5V Power Distribution
      from 12 V Bus

The TPS54521 is a full featured 17V, 5A synchronous step down converter which is optimized for small designs through high efficiency and integrated 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. Hiccup protection will be triggered if the overcurrent condition has persisted for longer than the preset time. Thermal shutdown disables the part when die temperature exceeds thermal shutdown temperature. The TPS54521 is available in a 14 pin, 3.5mm × 3.5mm QFN, thermally enhanced package.

The TPS54521 is a full featured 17V, 5A synchronous step down converter which is optimized for small designs through high efficiency and integrated 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. Hiccup protection will be triggered if the overcurrent condition has persisted for longer than the preset time. Thermal shutdown disables the part when die temperature exceeds thermal shutdown temperature. The TPS54521 is available in a 14 pin, 3.5mm × 3.5mm QFN, thermally enhanced package.

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Technical documentation

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Type Title Date
* Data sheet 17V Input, 5A Output, Synchronous Step Down Switcher With Integrated FET datasheet (Rev. C) 28 Aug 2013
EVM User's guide TPS54521 Step-Down Converter Evaluation Module User's Guide (Rev. A) PDF | HTML 26 Aug 2021
Application note Designing Type III Compensation for Current Mode Step-Down Converters (Rev. A) 15 Sep 2010

Design & development

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

Evaluation board

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Calculation tool

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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

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

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