TPS54308 4.5V to 28V Input, 3A Output, Synchronous 350kHz FCCM Step-Down Converter | TI.com

TPS54308
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4.5V to 28V Input, 3A Output, Synchronous 350kHz FCCM Step-Down Converter

 

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Description

The TPS54308 is a 4.5-V to 28-V input voltage range, 3-A synchronous buck converter. The device includes two integrated switching FETs, internal loop compensation and 5-ms internal soft start to reduce component count.

By integrating the MOSFETs and employing the SOT-23 package, the TPS54308 achieves the high power density and offers a small footprint on the PCB.

The TPS54308 operates in force continous conduction mode (FCCM) during light load conditions, the switching frequency is maintained at an almost constant level over entire load range.

Cycle-by-cycle current limit in both high-side MOSFET protects the converter in an overload condition and is enhanced by a low-side MOSFET freewheeling current limit which prevents current runaway. Hiccup mode protection is triggered if the overcurrent condition has persisted for longer than the present time.

Features

  • 4.5-V to 28-V Wide Input Voltage Range
  • Integrated 85-mΩ and 40-mΩ MOSFETs for 3-A, Continuous Output Current
  • Low 2-µA Shutdown, 300-µA Quiescent Current
  • Internal 5-mS Soft-Start
  • Fixed 350-kHz Switching Frequency
  • Peak Current Mode Control
  • Internal Loop Compensation
  • Overcurrent Protection for Both MOSFETs with Hiccup Mode Protection
  • Over Voltage Protection
  • Thermal Shutdown
  • SOT-23 (6) Package
  • Create a Custom Design Using the TPS54308 With the WEBENCH® Power Designer

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WEBENCH® Designer TPS54308

  Min   Max Range
Vin  V 4.5 to 28.0V
Vout  V 0.596 to 25V
Iout  A ≤ 3A
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)
TPS54308 Order now 4.5     28     1     26     3     1     350     350     0.3     Enable
Forced PWM
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable
Soft Start Fixed    
Current Mode     100     -40 to 125     Catalog     SOT-23-THIN | 6     Converter     6SOT-23-THIN: 5 mm2: 1.6 x 2.9 (SOT-23-THIN | 6)    
TPS54202 Order now 4.5     28     0.6     26     2     1     500     500     0.04     Enable
Light Load Efficiency
Pre-Bias Start-Up
Spread Spectrum
Synchronous Rectification
UVLO Adjustable
Soft Start Fixed    
Current Mode     100     -40 to 125     Catalog     SOT-23-THIN | 6     Converter     6SOT-23-THIN: 5 mm2: 1.6 x 2.9 (SOT-23-THIN | 6)    
TPS54202H Order now 4.5     28     0.6     26     2     1     500     500     0.04     Enable
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable
Soft Start Fixed    
Current Mode     100     -40 to 125     Catalog     SOT-23-THIN | 6     Converter     6SOT-23-THIN: 5 mm2: 1.6 x 2.9 (SOT-23-THIN | 6)    
TPS54302 Order now 4.5     28     0.6     26     3     1     400     400     0.04     Enable
Light Load Efficiency
Pre-Bias Start-Up
Spread Spectrum
Synchronous Rectification
UVLO Adjustable
Soft Start Fixed    
Current Mode     100     -40 to 125     Catalog     SOT-23-THIN | 6     Converter     6SOT-23-THIN: 5 mm2: 1.6 x 2.9 (SOT-23-THIN | 6)    
TPS56339 Order now 4.5     24     0.8     16     3     1     500     500     0.093     Enable
Light Load Efficiency
Synchronous Rectification
Soft Start Fixed    
Current Mode     95     -40 to 125     Catalog     SOT-23-THIN | 6     Converter