TPS40090 4 Channel Multiphase Buck DC/DC Controller |

TPS40090 (ACTIVE) 4 Channel Multiphase Buck DC/DC Controller


Recommended alternative parts

  • TPS40428  -  For new designs, please consider this dual-output, 2-phase, stackable buck controller.
  • TPS53647  -  For new designs, please consider this dual-output, 4-Phase, step-down buck controller.


The TPS4009x is a two-, three-, or four-phase programmable synchronous buck controller that is optimized for low-voltage, high-current applications powered by a 5-V to 15-V distributed supply. A multi-phase converter offers several advantages over a single power stage including lower current ripple on the input and output capacitors, faster transient response to load steps, improved power handling capabilities, and higher system efficiency.

Each phase can be operated at a switching frequency up to 1-MHz, resulting in an effective ripple frequency of up to 4-MHz at the input and the output in a four-phase application. A two-phase design operates 180 degrees out-of-phase, a three-phase design operates 120 degrees out-of-phase, and a four-phase design operates 90 degrees out-of-phase.

The number of phases is programmed by connecting the de-activated phase PWM output to the output of the internal 5-V LDO. In two-phase operation the even phase outputs should be de-activated.

The TPS4009x uses fixed frequency, peak current mode control with forced phase current balancing. When compared to voltage mode control, current mode results in a simplified feedback network and reduced input line sensitivity. Phase current is sensed by using either current sense resistors installed in series with output inductors or, for improved efficiency, by using the DCR (direct current resistance) of the filter inductors. The latter method involves generation of a current proportional signal with an R-C circuit.

The R-C values are selected by matching the time constants of the R-C circuit and the inductor; R-C = L/DCR. With either current sense method, the current signal is amplified and superimposed on the amplified voltage error signal to provide current mode PWM control.

An output voltage droop can be programmed to improve the transient window and reduce size of the output filter. Other features include a single voltage operation, a true differential sense amplifier, a programmable current limit, soft-start and a power good indicator.


  • Two-, Three-, or Four-Phase Operation
  • 5-V to 15-V Operating Range
  • Programmable Switching Frequency Up to 1-MHz/Phase
  • Current Mode Control With Forced Current Sharing(1)
  • 1% Internal 0.7-V Reference
  • Resistive Divider Set Output Voltage
  • True Remote Sensing Differential Amplifier
  • Resistive or DCR Current Sensing
  • Current Sense Fault Protection
  • Programmable Load Line
  • Compatible with UCC37222 Predictive Gate Drive™ Technology Drivers
  • 24-Pin Space-Saving TSSOP Package
  • 28-Pin QFN Package
  • TPS40090: Binary Outputs
  • TPS40091: 3-State Outputs
    • Internet Servers
    • Network Equipment
    • Telecommunications Equipment
    • DC Power Distributed Systems

(1) Patent pending.

Predictive Gate Drive is a trademark of Texas Instruments.


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Part number Order 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
TPS40090 Order now 4.5     15     0.7     3.3     120     1     4     100     1000     4     Enable
Power Good
Remote Sense    
87.5     -40 to 85     Catalog     TSSOP | 24
VQFN | 28    
Controller     Current Mode    
TPS40091 Samples not available 4.5     15     0.7     3.3     120     1     4     100     1000     4     Enable
Frequency Synchronization
Power Good
Remote Sense
Synchronous Rectification    
87.5     -40 to 85     Catalog     TSSOP | 24     Controller     Current Mode