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.
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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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WEBENCH® Designer TPS56428

  Min   Max Range
Vin  V 4.5 to 18.0V
Vout  V 0.6 to 7V
Iout  A ≤ 4A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order 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 Order now 4.5     18     0.6     5.5     4     1     650     650     0.25     Enable
Light Load Efficiency
Power Good
Synchronous Rectification
Soft Start Fixed    
D-CAP2     65     -40 to 85     Catalog     SO PowerPAD | 8
VQFN | 14    
Converter     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
14VQFN: 12 mm2: 3.5 x 3.5 (VQFN | 14)    
TPS564201 Order now 4.5     17     0.76     7     4     1     500     600     0.4     Enable
Light Load Efficiency
Synchronous Rectification
Soft Start Fixed    
D-CAP2     80     -40 to 125     Catalog     SOT-23-THIN | 6     Converter     6SOT-23-THIN: 5 mm2: 1.6 x 2.9 (SOT-23-THIN | 6)    
TPS564208 Order now 4.5     17     0.76     7     4     1     560     560     0.65     Enable
Forced PWM
Synchronous Rectification
Soft Start Fixed    
D-CAP2     80     -40 to 125     Catalog     SOT-23-THIN | 6     Converter     6SOT-23-THIN: 5 mm2: 1.6 x 2.9 (SOT-23-THIN | 6)