Dual Output or Multiphase Synchronous Buck Controller with PMBus - TPS40422


Dual Output or Multiphase Synchronous Buck Controller with PMBus


The TPS40422 is a dual-output PMBus protocol, synchronous buck controller. It can be configured also for a single, two-phase output.

The wide input range supports 5-V and 12-V intermediate buses. The accurate reference voltage satisfies the need of precision voltage to the modern ASICs and potentially reduces the output capacitance. Voltage mode control is implemented to reduce noise sensitivity and also ensures low duty ratio conversion.

For all available packages, see the orderable addendum at the end of the datasheet.

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Using the PMBus protocol, the device margining function, reference voltage, fault limit, UVLO threshold, soft-start time, turn-on delay, and turn-off delay can be programmed.

In addition, an accurate measurement system is implemented to monitor the output voltages, currents and temperatures for each channel.


  • Single Supply Operation: 4.5 V to 20 V
  • Output Voltage from 0.6 V to 5.6 V
  • Dual-output or Two-Phase Synchronous Buck Controller
  • PMBus Interface Capability
    • Margining Up/Down with 2-mV Step
    • Programmable Fault Limit and Response
    • Output Voltage, Output Current Monitoring
    • External Temperature Monitoring with 2N3904
    • Programmable UVLO ON/OFF Thresholds
    • Programmable Soft-Start Time and Turn-On and Turn-Off Delay
  • On-Chip Non-volatile Memory (NVM) to Store Custom Configurations
  • 180° Out-of-Phase to Reduce Input Ripple
  • 600-mV Reference Voltage with ±0.5% Accuracy from 0°C to 85°C
  • Inductor DCR Current Sensing
  • Programmable Switching Frequency from 200 kHz to 1 MHz
  • Voltage Mode Control with Input Feed Forward
  • Current Sharing for Multiphase Operation
  • Supports Pre-biased Output
  • Differential Remote Sensing
  • External SYNC
  • BPEXT Pin Boosts Efficiency by Supporting External Bias Power Switch Over
  • OC/OV/UV/OT Fault Protection
  • 40-Pin, 6 mm × 6 mm, QFN Package with 0.5-mm pin pitch

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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 (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Performance Features
Communication Interface
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
TPS40422 TPS40322 TPS40400
4.5     3     3    
20     20     20    
60     60     30    
2     2     1    
200     100     200    
1000     1000     2000    
Dynamic Voltage Scaling
Frequency Synch
Remote Sense    
Frequency Synch
Remote Sense    
Dynamic Voltage Scaling
Frequency Synch
Power Good
Pre-Bias Start-Up
Remote Sense
Synchronous Rectification
PMBus       PMBus    
90     95     90    
-40 to 125     -40 to 125     -40 to 125    
Catalog     Catalog     Catalog