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

TPS54308 (ACTIVE)

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

 

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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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)
TPS54308 TPS54202 TPS54202H TPS54302 TPS54331 TPS56339
4.5     4.5     4.5     4.5     3.5     4.5    
28     28     28     28     28     24    
1     0.6     0.6     0.6     0.8     0.8    
26     26     26     26     25     16    
3     2     2     3     3     3    
1     1     1     1     1     1    
350     390     390     290     570     500    
350     590     590     510     570     500    
0.3     0.04     0.04     0.04     0.11     0.093    
Enable
Forced Pulse Width Modulation (FPWM) Mode
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Enable
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Enable
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Enable
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Enable
Light Load Efficiency
UVLO Adjustable    
Enable
Light Load Efficiency
Synchronous Rectification    
Current Mode     Current Mode     Current Mode     Current Mode     Current Mode     D-CAP3    
100     100     100     100     90     95    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 150     -40 to 125    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
SOT-23-THIN | 6     SOT-23-THIN | 6     SOT-23-THIN | 6     SOT-23-THIN | 6     SO PowerPAD | 8
SOIC | 8    
SOT-23-THIN | 6    
Converter     Converter     Converter     Converter     Converter     Converter    
6SOT-23-THIN: 8 mm2: 2.8 x 2.9 (SOT-23-THIN | 6)     6SOT-23-THIN: 8 mm2: 2.8 x 2.9 (SOT-23-THIN | 6)     6SOT-23-THIN: 8 mm2: 2.8 x 2.9 (SOT-23-THIN | 6)     6SOT-23-THIN: 8 mm2: 2.8 x 2.9 (SOT-23-THIN | 6)     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
8SOIC: 29 mm2: 6 x 4.9 (SOIC | 8)    
6SOT-23-THIN: 8 mm2: 2.8 x 2.9 (SOT-23-THIN | 6)    

Design tool

New!
WEBENCH® Power Designer is now even easier to use. Try it now.

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


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