TPS56428 4.5V to 18V Input, 4-A Synchronous Step-Down Converter with Advanced Eco-mode™ | TI.com

TPS56428 (ACTIVE)

4.5V to 18V Input, 4-A Synchronous Step-Down Converter with Advanced Eco-mode™

 

Recommended alternative parts

  • TPS56528  -  Looking for a device with more output current? Try the TPS56528.
  • TPS54328  -  Looking for a device with less output current? Try the TPS54328.
  • TPS54427  -  Looking for a device with non Eco-mode™? Try the TPS54427.
  • TPS54428  -  Looking for a device with Eco-mode™? Try the TPS54428.
  • TPS54531  -  Looking for a device with higher input voltage? Try theTPS54531.
  • TPS54429E  -  Looking for a device with Power-Good? Try the TPS54429E.

Description

The TPS56428 is a D-CAP2 mode synchronous buck converter which is optimized for various power bus regulation needs with a cost effective, low component count, low standby current solution.

The D-CAP2 mode control provides a fast transient response with no external compensation components. This adaptive on-time control supports seamless transition between PWM mode at higher load conditions and advanced Eco-mode operation at light loads. Advanced Eco-mode™ maintains higher efficiency during lighter load conditions than traditional skip mode.

The TPS56428 also has a proprietary circuit to adopt 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 VIN input and its output voltage can be programmed between 0.6V and 7.0V. The device also features a fixed 1-ms soft start and a power-good output.

The TPS56428 is available in 8-pin SOIC-8 and 14-pin QFN packages designed to operate over the ambient temperature range of –40°C to 85°C.

Features

  • D-CAP2™ Mode at 650kHz Switching for Fast
    Transient Response, Ceramic Capacitor Support
  • VIN Input Voltage Range: 4.5 V to 18 V
  • Output Voltage Range: 0.6 V to 7.0 V
  • Advanced Eco-mode for High Light Load
    Efficiency
  • Integrated FETs Optimized for Lower Duty Cycle
    – 68 mΩ (High Side) and 37 mΩ (Low Side)
  • Shutdown Current Less Than 10 µA
  • 1% Initial Reference Voltage Accuracy
  • Soft Start with Pre-Bias Output Support
  • Cycle By Cycle Over Current Limit
  • Power Good Output
  • Fixed Soft Start : 1.0ms

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Parametrics Compare all products in Buck converters (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)
Features
Control mode
Duty cycle (Max) (%)
Operating temperature range (C)
Rating
Package Group
Type
Package size: mm2:W x L (PKG)
TPS56428 TPS54227 TPS54228 TPS54327 TPS54328 TPS54427 TPS54428 TPS54627 TPS54628 TPS56528 TPS56628
4.5     4.5     4.5     4.5     4.5     4.5     4.5     4.5     4.5     4.5     4.5    
18     18     18     18     18     18     18     18     18     18     18    
0.6     0.76     0.76     0.76     0.76     0.76     0.76     0.76     0.76     0.6     0.76    
5.5     7     7     7     7     7     7     5.5     5.5     7     5.5    
4     2     2     3     3     4     4     6     6     5     6    
1     1     1     1     1     1     1     1     1     1     1    
650     700     700     700     700     650     650     650     650     650     650    
650     700     700     700     700     650     650     650     650     650     650    
0.25     0.8     0.8     0.8     0.8     0.95     0.95     0.95     0.95     0.25     0.95    
Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
Enable
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
Enable
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
Enable
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
Enable
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2     Current Mode     D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2    
65     65     65