TPS40400 3.0V - 20V, 30A, Synchronous Buck Controller with PMBus™, including Telemetry |


3.0V - 20V, 30A, Synchronous Buck Controller with PMBus™, including Telemetry

3.0V - 20V, 30A, Synchronous Buck Controller with PMBus™, including Telemetry - TPS40400


The TPS40400 is a cost-optimized flexible synchronous buck controller that operates from a nominal 3-V to 20-V supply. This controller is an analog PWM controller that allows programming and monitoring through the PMBus™ interface. Flexible features found on this device include programmable soft-start time, programmable short circuit limit, and programmable undervoltage lockout (UVLO).

An adaptive anti-cross conduction scheme is used to prevent shoot through current in the power FETs. Gate drive voltage is 6 V to better enhance the power FETs for reduced losses. Short circuit detection occurs by sensing the voltage drop across the inductor or across a resistor placed in series with the inductor. A PMBus programmable threshold is compared to this voltage and is used to detect overcurrent. When the overcurrent threshold is reached, a pulse by pulse current limit scheme is used to limit the current to acceptable levels. If the overcurrent condition persists for more than 7 clock cycles of the converter, a fault condition is declared and the converter shuts down and goes into either a hiccup restart mode or latches off. The behavior can be selected through the PMBus interface. Other PMBus interface features include programmable operating frequency, soft-start time, overvoltage and undervoltage thresholds and the response to those events, output voltage change including margining as well as status monitoring.


  • Input Operating Voltage Range: 3 V to 20 V
  • PMBus Enabled Analog Controller
  • Reference 600 mV ± 1%
  • Remote Voltage Sense Amplifier
  • Internal 6-V Regulator and 6-V Gate Drive
  • Programmable Overcurrent Protection
  • Inductor Resistance or Series Resistance Used for Current Sensing
  • Programmable Switching Frequency: 200 kHz to 2 MHz
  • Powergood Indicator
  • Thermal Shutdown
  • Programmable Soft-Start
  • Internal Bootstrap Diode
  • Prebias Output Safe
  • 24-Pin QFN Package

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Parametrics Compare all products in Buck Controller (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)
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
Control Mode
TPS40400 TPS40422
3     4.5    
20     20    
0.6     0.6    
5     5.6    
30     60    
1     2    
1     2    
200     200    
2000     1000    
6     18    
Dynamic Voltage Scaling
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Remote Sense
Synchronous Rectification
Dynamic Voltage Scaling
Frequency Synchronization
Multiple Outputs
Phase Interleaving
Remote Sense    
90     90    
-40 to 125     -40 to 125    
Catalog     Catalog    
VQFN | 24     VQFN | 40
WQFN | 40    
Voltage Mode     Voltage Mode    
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WEBENCH® Designer TPS40400

  Min   Max Range
Vin  V 3.0 to 20.0V
Vout  V 0.6 to 5V
Iout  A ≤ 30A
Ambient Temp  °C -40 to 150°C

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