(ACTIVE) 4.5V to 18V Input, 3A Synchronous Step-Down Converter


Simplified Schematic

Load Transient Response


The TPS54325 device is an adaptive on-time D-CAP2™ mode synchronous buck converter. The TPS54325 device enables system designers to complete the suite of various end equipment’s power bus regulators with a cost effective, low component count, low standby current solution.

The main control loop for the TPS54325 uses the D-CAP2™ mode control which provides a very fast transient response with no external components. The TPS54325 also has a proprietary circuit that enables the device to adapt to both low equivalent series resistance (ESR) output capacitors, such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors. The device operates from 4.5-V to 18-V VCC input , and from 2.0-V to 18-V VIN input power supply voltage. The output voltage can be programmed between 0.76 V and 5.5 V. The device also features an adjustable slow start time and a power good function. The TPS54325 is available in the 14 pin HTSSOP package, and designed to operate from –40°C to 85°C.


  • D-CAP2™ Mode Enables Fast Transient Response
  • Low Output Ripple and Allows Ceramic Output Capacitor
  • Wide VCC Input Voltage Range: 4.5 V to 18 V
  • Wide VIN Input Voltage Range: 2.0 V to 18 V
  • Output Voltage Range: 0.76 V to 5.5 V
  • Highly Efficient Integrated FET’s Optimized for
    Lower Duty Cycle Applications – 120 mΩ (High Side)
    and 70 mΩ (Low Side)
  • High Efficiency, less than 10 µA at shutdown
  • High Initial Bandgap Reference Accuracy
  • Adjustable Soft Start
  • Pre-Biased Soft Start
  • 700-kHz Switching Frequency (fSW)
  • Cycle By Cycle Over Current Limit
  • Power Good Output


Vin (Min) (V) 4.5    
Vin (Max) (V) 18    
Vout (Min) (V) 0.76    
Vout (Max) (V) 5.5    
Iout (Max) (A) 3    
Regulated Outputs (#) 1    
Switching Frequency (Min) (kHz) 700    
Switching Frequency (Max) (kHz) 700    
Iq (Typ) (mA) 0.85    
Special Features Enable^Power Good^Synchronous Rectification    
Control Mode D-CAP2    
Duty Cycle (Max) (%) 90    
Operating Temperature Range (C) -40 to 85    
Rating Catalog    
Package Group HTSSOP    
Approx. Price (US$) 0.85 | 1ku    

Companion Products

Technical Documents

Datasheet (1)

Application notes (4)

User guides (1)

Selection guides (2)

Design files (3)

More literature (1)

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