4.5V to 18V Input, 3A Synchronous Step-Down Converter - TPS54325

TPS54325 (ACTIVE)

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

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Description

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.

Features

  • 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

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Parametrics Compare all products in Buck Converter (Integrated Switch)

 
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)
Performance Features
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
Approx. Price (US$)
TPS54325 TPS54225 TPS54226 TPS54326 TPS54425 TPS54426 TPS54429 TPS54429E TPS54525 TPS54526 TPS54625 TPS54626
4.5     4.5     4.5     4.5     4.5     4.5     7     7     4.5     4.5     4.5     4.5    
18     18     18     18     18     18     18     18     18     18     18     18    
0.76     0.76     0.76     0.76     0.76     0.76     0.76     0.76     0.76     0.76     0.76     0.76    
5.5     5.5     5.5     5.5     5.5     5.5     5.5     5.5     5.5     5.5     5.5     5.5    
3     2     2     3     4     4     4.5     4.5     5.5     5.5     6.5     6.5    
1     1         1       1       1       1     1    
700     700     700     700     700     700     700     700     650     650     650     650    
700     700     700     700     700     700     700     700     650     650     650     650    
0.85     0.8     0.8     0.85     0.85     0.85     0.85     0.85     0.9     0.9     0.95     0.95    
Enable
Power Good
Synchronous Rectification    
Enable
Power Good
Synchronous Rectification    
Enable
Light Load Efficiency Mode
Power Good
Synchronous Rectification    
Enable
Light Load Efficiency Mode
Power Good
Synchronous Rectification    
Enable
Power Good
Synchronous Rectification    
Enable
Light Load Efficiency Mode
Power Good
Synchronous Rectification    
Enable
Power Good
Synchronous Rectification    
Enable
Light Load Efficiency Mode
Power Good
Synchronous Rectification    
Enable
Power Good
Synchronous Rectification    
Enable
Light Load Efficiency Mode
Power Good
Synchronous Rectification    
Enable
Power Good
Synchronous Rectification    
Enable
Light Load Efficiency Mode
Power Good
Synchronous Rectification    
D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2    
90     90     90     90     90     90     98     98     95     95     95     95    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -20 to 85     -20 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
HTSSOP     HTSSOP     HTSSOP
QFN    
HTSSOP
QFN    
HTSSOP     HTSSOP
QFN    
HTSSOP     HTSSOP
QFN    
HTSSOP     HTSSOP
QFN    
HTSSOP     HTSSOP    
0.85 | 1ku     0.73 | 1ku     0.75 | 1ku     0.87 | 1ku     1.02 | 1ku     1.08 | 1ku     1.07 | 1ku     1.09 | 1ku     1.20 | 1ku     1.22 | 1ku     1.70 | 1ku     1.75 | 1ku    

Other qualified versions of TPS54325

Version Part Number Definition
Automotive TPS54325-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
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WEBENCH® Designer TPS54325

  Min   Max Range
Vin  V 4.5 to 18.0V
Vout  V 0.77 to 5.5V
Iout  A ≤ 3A
Ambient Temp  °C -40 to 85°C


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