TPS54320 4.5V to 17V Input, 3A Synchronous Step-Down SWIFT™ Converter |

This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
4.5V to 17V Input, 3A Synchronous Step-Down SWIFT™ Converter


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The TPS54320 is a full-featured 17-V, 3-A 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 footprint of the inductor.

The output voltage start-up 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 is 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 TPS54320 is available in a 14-pin, 3.5-mm × 3.5-mm VQFN, thermally enhanced package.


  • Integrated 57-mΩ / 50-mΩ MOSFETs
  • Split Power Rail: 1.6 to 17 V on PVIN
  • 200-kHz to 1.2-MHz Switching Frequency
  • Synchronizes to External Clock
  • 0.8-V Voltage Reference With ±1% Accuracy
  • Low 2-µA Shutdown Quiescent Current
  • Hiccup Overcurrent Protection
  • Monotonic Start-Up into Prebiased Outputs
  • –40°C to 150°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 (UVLO)
  • Supported by SwitcherPro™ Software Tool
  • For SWIFT™ Documentation and SwitcherPro, Visit
  • Create a Custom Design Using the TPS54320 With the WEBENCH® Power Designer

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WEBENCH® Designer TPS54320

  Min   Max Range
Vin  V 4.5 to 17.0V
Vout  V 0.8 to 15V
Iout  A ≤ 3A
Ambient Temp  °C -40 to 85°C


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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (Max) (A) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Control mode Duty cycle (Max) (%) Operating temperature range (C) Package Group Rating Type Package size: mm2:W x L (PKG)
TPS54320 Order now 4.5     17     0.8     15     3     1     200     1200     0.6     Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Current Mode     98     -40 to 150     VQFN | 14     Catalog     Converter     14VQFN: 12 mm2: 3.5 x 3.5 (VQFN | 14)