TPS54427 4.5V to 18V Input, 4-A Synchronous Step-Down Converter | TI.com

TPS54427 (ACTIVE) 4.5V to 18V Input, 4-A Synchronous Step-Down Converter

 

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Description

The TPS54427 is an adaptive on-time D-CAP2™ mode synchronous buck converter. The TPS54427 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 TPS54427 uses the D-CAP2™ mode control which provides a fast transient response with no external compensation components.

The TPS54427 also has a proprietary circuit that enables the device 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. The output voltage can be programmed between 0.76 V and 7 V.

The device also features an adjustable soft start time.

The TPS54427 is available in the 8-pin DDA package and 10-pin DRC, and is 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 VIN Input Voltage Range: 4.5 V to 18 V
  • Output Voltage Range: 0.76 V to 7.0 V
  • Highly Efficient Integrated FETs Optimized
    for Lower Duty Cycle Applications
    – 70 mΩ (High Side) and 53 mΩ (Low Side)
  • High Efficiency, Less Than 10 µA at Shutdown
  • High Initial Bandgap Reference Accuracy
  • Adjustable Soft Start
  • Pre-Biased Soft Start
  • 650-kHz Switching Frequency (fSW)
  • Cycle by Cycle Over Current Limit

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WEBENCH® Designer TPS54427

  Min   Max Range
Vin  V 4.5 to 18.0V
Vout  V 0.765 to 7V
Iout  A ≤ 4A
Ambient Temp  °C -40 to 85°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)
TPS54427 Order now 4.5     18     0.76     7     4     1     650     650     0.95     Enable
Synchronous Rectification
Soft Start Adjustable    
Current Mode     65     -40 to 85     Catalog     SO PowerPAD | 8
VSON | 10    
Converter     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
10VSON: 9 mm2: 3 x 3 (VSON | 10)    
TPS54425 Order now 4.5     18     0.76     5.5     4     1     700     700     0.85     Enable
Power Good
Synchronous Rectification
Soft Start Adjustable    
D-CAP2     90     -40 to 85     Catalog     HTSSOP | 14     Converter     14HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 14)    
TPS54426 Order now 4.5     18     0.76     5.5     4     1     700     700     0.85     Enable
Light Load Efficiency
Power Good
Synchronous Rectification
Soft Start Adjustable    
D-CAP2     90     -40 to 85     Catalog     HTSSOP | 14
QFN | 16    
Converter     14HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 14)
16QFN: 16 mm2: 4 x 4 (QFN | 16)    
TPS54428 Order now 4.5     18     0.76     7     4     1     650     650     0.95     Enable
Light Load Efficiency
Synchronous Rectification
Soft Start Adjustable    
D-CAP2     65     -40 to 85     Catalog     SO PowerPAD | 8
VSON | 10    
Converter     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
10VSON: 9 mm2: 3 x 3 (VSON | 10)    
TPS54429 Order now 7     18     0.76     5.5     4.5     1     700     700     0.85     Enable
Power Good
Synchronous Rectification
Soft Start Adjustable    
D-CAP2     98     -20 to 85     Catalog