2.95V to 6V Input, 4A Synchronous Step-Down SWIFT™ Converter - TPS54418


2.95V to 6V Input, 4A Synchronous Step-Down SWIFT™ Converter

Recommended alternative parts

  • TPS54478  -  2.95 to 6V, 4A with Pre-biased Start up and Hiccup Current Limit


The TPS54418 device is a full featured 6 V, 4 A, synchronous step down current mode converter with two integrated MOSFETs.

The TPS54418 enables small designs by integrating the MOSFETs, implementing current mode control to reduce external component count, reducing inductor size by enabling up to 2 MHz switching frequency, and minimizing the IC footprint with a small 3mm x 3mm thermally enhanced QFN package.

The TPS54418 provides accurate regulation for a variety of loads with an accurate ±1% Voltage Reference (VREF) over temperature.

Efficiency is maximized through the integrated 30mΩ MOSFETs and 350µA typical supply current. Using the enable pin, shutdown supply current is reduced to 2 µA by entering a shutdown mode.

Under voltage lockout is internally set at 2.6 V, but can be increased by programming the threshold with a resistor network on the enable pin. The output voltage startup ramp is controlled by the slow start pin. An open drain power good signal indicates the output is within 93% to 107% of its nominal voltage.

Frequency fold back and thermal shutdown protects the device during an overcurrent condition.

The TPS54418 is supported in the SwitcherProTM Software Tool at www.ti.com/switcherpro.

For more SWIFTTM documentation, see the TI website at www.ti.com/swift.


  • Two 30 mΩ (typical) MOSFETs for high efficiency at 4 A loads
  • 200kHz to 2MHz Switching Frequency
  • 0.8 V ± 1% Voltage Reference Over Temperature
  • Synchronizes to External Clock
  • Adjustable Slow Start/Sequencing
  • UV and OV Power Good Output
  • Low Operating and Shutdown Quiescent Current
  • Safe Start-up into Pre-Biased Output
  • Cycle by Cycle Current Limit, Thermal and Frequency Fold Back Protection
  • –40°C to 150°C Operating Junction Temperature Range
  • Thermally Enhanced 3mm × 3mm 16-pin QFN
    • Low-Voltage, High-Density Power Systems
    • Point of Load Regulation for High Performance DSPs, FPGAs, ASICs and
    • Broadband, Networking and Optical Communications Infrastructure

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Parametrics Evaluate all products in Step-Down (Buck) Converter

  TPS54418 Compare
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Regulated Outputs (#) 1
Vin (Min) (V) 2.95
Vin (Max) (V) 6
Vout (Min) (V) 0.8
Vout (Max) (V) 4.5
Iout (Max) (A) 4
Iout2 (Max) (A) -
Vout2 (Min) (V) -
Vout2 (Max) (V) -
Topology Buck
  • Boost
  • Buck
  • Buck-Boost
  • Inverting Buck-Boost
Switching Frequency (Max) (kHz) 2000
Switch Current Limit (Typ) (A) 5
Iq (Typ) (mA) 0.35
Duty Cycle (Max) (%) 98
Soft Start Adjustable
  • Adjustable
  • Fixed
  • None
Compensation External
  • External
  • Internal
  • Not Needed
Special Features Enable
Frequency Synchronization
Power Good
Adjustable UVLO
Synchronous Rectification
  • Adjustable Current Limit
  • Adjustable UVLO
  • Dynamic Voltage Scaling
  • Enable
  • Frequency Synchronization
  • Light Load Efficiency
  • Phase Interleaving
  • Power Good
  • Synchronous Rectification
  • Tracking
Control Mode Current Mode
  • COT with emulated ripple
  • Constant on-time (COT)
  • Current Mode
  • D-CAP
  • D-CAP+
  • D-CAP2
  • D-CAP3
  • Voltage Mode
Preset Vout (V) -
Vref Accuracy (Typ) (%) 1
Rating Catalog
  • Automotive
  • Catalog
  • HiRel Enhanced Product
  • High Temp
  • Military
  • Space
Operating Temperature Range (C) -40 to 150 °C to °C
Approx. Price (US$) 2.15 | 1ku
Package Group WQFN
  • CFP
  • DDPAK/TO-263
  • MSOP-PowerPAD
  • PDIP
  • QFN
  • SO PowerPAD
  • SOIC
  • SON
  • SOT
  • SOT-23
  • TO-220
  • TO-263
  • USON
  • VQFN
  • VSON
  • WQFN
  • WSON
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So what do you think? Leave a comment about this table...

    Min   Max   Range  
  Vin V    2.90 – 6.00V  
  Vout V    0.80 – 4.50V  
  Iout A    ≤ 4A  
  Ambient Temp °C    -40 – 150°C  
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