Startseite Energiemanagement AC/DC- und DC/DC-Wandler (integrierter FET)

TPS54821

AKTIV

Synchroner Abwärtswandler, 4,5 bis 17 V Eingangsspannung, 8 A, mit Hiccup-Strombegrenzungsmodus

Produktdetails

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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Technische Dokumentation

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Alle anzeigen 7
Typ Titel Datum
* Data sheet TPS54821 4.5 V to 17 V Input, 8 A Synchronous Step Down Converter With Hiccup datasheet (Rev. B) PDF | HTML 10 Feb 2016
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EVM User's guide TPS54821 Step-Down Converter Evaluation Module User's Guide (Rev. A) PDF | HTML 20 Aug 2021
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Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
More literature Common Mistakes in DC/DC Converters and How to Fix Them 14 Feb 2018

Design und Entwicklung

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Evaluierungsplatine

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Berechnungstool

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Test report: PDF
Schaltplan: PDF
Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
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Bestellen & Qualität

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  • RoHS
  • REACH
  • Bausteinkennzeichnung
  • Blei-Finish/Ball-Material
  • MSL-Rating / Spitzenrückfluss
  • MTBF-/FIT-Schätzungen
  • Materialinhalt
  • Qualifikationszusammenfassung
  • Kontinuierliches Zuverlässigkeitsmonitoring
Beinhaltete Information:
  • Werksstandort
  • Montagestandort

Support und Schulungen

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