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TPS54521

ACTIVE

17V Input, 5A Synchronous Step-Down Converter

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Data sheet

TPS54521

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Buck Iout (max) (A) 5 Vin (max) (V) 17 Vin (min) (V) 4.5 Vout (max) (V) 15 Vout (min) (V) 0.8 Features Enable, Frequency synchronization, Power good, Prebias startup, Soft-start adjustable, Synchronous rectification, Tracking Control mode current mode Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 900 Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 600 Duty cycle (max) (%) 98 Type Converter
Rating Catalog Topology Buck Iout (max) (A) 5 Vin (max) (V) 17 Vin (min) (V) 4.5 Vout (max) (V) 15 Vout (min) (V) 0.8 Features Enable, Frequency synchronization, Power good, Prebias startup, Soft-start adjustable, Synchronous rectification, Tracking Control mode current mode Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 900 Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 600 Duty cycle (max) (%) 98 Type Converter
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
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

TPS54521EVM-607 — Evaluation Module for TPS54521 Synchronous Buck Regulator

The TPS54521EVM-607 is a fully assembled and tested circuit for evaluating the TPS54521 Synchronous Step-Down Switcher with Integrated FET.
User guide: PDF | HTML
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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
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Package Pins CAD symbols, footprints & 3D models
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TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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Information included:
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