3.5V to 42V Input, 0.5 A Step Down Converter - TPS5401


3.5V to 42V Input, 0.5 A Step Down Converter


The TPS5401 device is a 42-V, 0.5-A, step-down regulator with an integrated high-side MOSFET. Current-mode control provides simple external compensation and flexible component selection. A low-ripple pulse-skip mode reduces the supply current to 116 µA when outputting regulated voltage with no load. Using the enable pin, shutdown supply current is reduced to 1.3 µA when the enable pin is low.

Undervoltage lockout is internally set at 2.5 V, but can be increased using the enable pin. The output voltage start-up ramp is controlled by the slow-start pin that can also be configured for sequencing/tracking. An open-drain power-good signal indicates the output is within 94% to 107% of its nominal voltage.

A wide switching-frequency range allows efficiency and external component size optimization. Frequency foldback and thermal shutdown protect the part during an overload condition.

The TPS5401 is available in a 10-pin thermally enhanced MSOP PowerPAD package.


  • 3.5-V to 42-V Input Voltage Range
  • 200-m High-Side MOSFET
  • High Efficiency at Light Loads With a Pulse-Skipping Eco-mode Control Scheme
  • 116-µA Operating Quiescent Current
  • 1.3-µA Shutdown Current
  • 100-kHz to 2.5-MHz Switching Frequency
  • Synchronizes to External Clock
  • Adjustable Slow Start/Sequencing
  • UV and OV Power-Good Output
  • Adjustable UVLO Voltage and Hysteresis
  • 0.8-V ±3.5% Internal Voltage Reference
  • MSOP10 With PowerPAD™ Package
  • Supported by SwitcherPro Software Tool
    (http://focus.ti.com/docs/toolsw/folders/print/switcherpro.html )
  • For SWIFT Power Products Documentation,
    See the TI Web Site at http://www.ti.com/swift
    • 12-V and 24-V Industrial and Commercial Low-Power Systems
    • E-Meters

Eco-mode, PowerPAD, SwitcherPro, SWIFT are trademarks of Texas Instruments.

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  TPS5401 Compare
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Regulated Outputs (#) 1
Vin (Min) (V) 3.5
Vin (Max) (V) 42
Vout (Min) (V) 0.8
Vout (Max) (V) 39
Iout (Max) (A) 0.5
Iout2 (Max) (A) -
Vout2 (Min) (V) -
Vout2 (Max) (V) -
Topology Buck
  • Boost
  • Buck
  • Buck-Boost
  • Inverting Buck-Boost
Switching Frequency (Max) (kHz) 2500
Switch Current Limit (Typ) (A) 0.94
Iq (Typ) (mA) 0.116
Duty Cycle (Max) (%) 98
Soft Start Adjustable
  • Adjustable
  • Fixed
  • None
Compensation External
  • External
  • Internal
  • Not Needed
Special Features Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Adjustable UVLO
  • 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) (%) 1.75
Rating Catalog
  • Automotive
  • Catalog
  • HiRel Enhanced Product
  • High Temp
  • Military
  • Space
Operating Temperature Range (C) -40 to 150 °C to °C
Approx. Price (US$) 0.85 | 1ku
Package Group MSOP-PowerPAD
  • CFP
  • DDPAK/TO-263
  • MSOP-PowerPAD
  • PDIP
  • QFN
  • SO PowerPAD
  • SOIC
  • SON
  • SOT
  • SOT-23
  • TO-220
  • TO-263
  • USON
  • VQFN
  • VSON
  • WQFN
  • WSON
  Sample & Buy Reset Update

So what do you think? Leave a comment about this table...

    Min   Max   Range  
  Vin V    3.50 – 42.00V  
  Vout V    0.80 – 39.00V  
  Iout A    ≤ 0.5A  
  Ambient Temp °C    -40 – 150°C  
Footprint BOM Cost Efficiency
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