TPS40305 3V to 20V Input, 25A Synchronous Buck Controller with FSS, 1.2MHz | TI.com

TPS40305 (ACTIVE)

3V to 20V Input, 25A Synchronous Buck Controller with FSS, 1.2MHz

 



Recommended FETs for TPS40305
Benefits of match controller and NexFETs
TPS40305 Advantages
  • Lower dead times improves efficiency
  • Strong gate drivers reduces switching losses
  • Higher gate driver voltage reduces Rdson
NexFET Advantages
  • 3-4% higher efficiency at mid to heavy loads over other MOSFETs
  • Allows 2x switching frequency for overall smaller solution size
Efficieny VS Load Current
Vin=12V, VOUT=1.2V Efficiency with TI NexFETs Controllers

Efficiency versus Load Current - TPS40305 with NexFET Advantages

Vin: 5V, Vout=1.2V Efficiency >90%, 1-20A (pk ~95%)
Vin: 12V, Vout=1.2V Efficiency =92% @15A

TPS40305 Design Example SchematicTPS40305 Design Example Schematic

Design Example Schematic - TPS40305 with NexFET Advantages


TPS40305 Design Example SchematicRecommended FETs for TPS40305

CSD16410
N-Channel NexFET™ Power MOSFET
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Get Samples Sample or Buy

CSD16322
N-Channel NexFET™ Power MOSFET
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Get Samples Sample or Buy

Description

The TPS4030x is a family of cost-optimized synchronous buck controllers that operate from 3-V to 20-V input. The controller implements a voltage-mode control architecture with input-voltage feed-forward compensation that responds instantly to a change in input voltage. The switching frequency is fixed at 300 kHz, 600 kHz, or 1.2 MHz.

The frequency spread-spectrum (FSS) feature adds to the switching frequency, significantly reducing the peak EMI noise and making it much easier to comply with EMI standards.

The TPS4030x offers design with a variety of user-programmable functions, including soft start, overcurrent protection (OCP) levels, and loop compensation.

OCP level may be programmed by a single external resistor connected from the LDRV pin to circuit ground. During initial power on, the TPS4030x enters a calibration cycle, measures the voltage at the LDRV pin, and sets an internal OCP voltage level. During operation, the programmed OCP voltage level is compared to the voltage drop across the low-side FET when it is on to determine whether there is an overcurrent condition. The TPS4030x then enters a shutdown and restart cycle until the fault is removed.

Features

  • Input Voltage Range From 3 V to 20 V
  • 300-kHz (TPS40303), 600-kHz (TPS40304), and 1.2-MHz (TPS40305) Switching Frequencies
  • High- and Low-Side FET RDS(on) Current Sensing
  • Programmable Thermally Compensated OCP Levels
  • Programmable Soft Start
  • 600-mV, 1% Reference Voltage
  • Voltage Feed-Forward Compensation
  • Supports Prebiased Output
  • Frequency Spread Spectrum
  • Thermal Shutdown Protection at 145°C
  • 10-Pin 3-mm × 3-mm VSON Package With Ground Connection to Thermal Pad
  • Create a Custom Design Using the TPS4030x With the WEBENCH® Power Designer

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Parametrics Compare all products in Buck controllers (external switch)

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated outputs (#)
Number of Phases
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Features
Duty cycle (Max) (%)
Operating temperature range (C)
Rating
Package Group
Type
Control mode
TPS40305 TPS40303 TPS40304 TPS40304A
3     3     3     3    
20     20     20     20    
0.6     0.6     0.6     0.6    
17     18     18     18    
25     25     25     25    
1     1     1     1    
1     1     1     1    
1200     300     600     600    
1200     300     600     600    
2.5     2.5     2.5     2.5    
Enable
Power Good
Pre-Bias Start-Up
Spread Spectrum
Synchronous Rectification    
Enable
Power Good
Pre-Bias Start-Up
Spread Spectrum
Synchronous Rectification    
Enable
Power Good
Pre-Bias Start-Up
Spread Spectrum
Synchronous Rectification    
Enable
Power Good
Pre-Bias Start-Up
Spread Spectrum
Synchronous Rectification    
85     90     90     90    
-40 to 125     -40 to 125     -40 to 125     -40 to 145    
Catalog     Catalog     Catalog     Catalog    
VSON | 10     VSON | 10     VSON | 10     VSON | 10    
Controller     Controller     Controller     Controller    
Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode    

Design tool

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

WEBENCH® Designer TPS40305

  Min   Max Range
Vin  V 3.0 to 20.0V
Vout  V 0.6 to 18V
Iout  A ≤ 25A
Ambient Temp  °C -40 to 145°C