4.5V to 14V Input, 15A Synchronous Step-Down SWIFT™ Converter - TPS56121


4.5V to 14V Input, 15A Synchronous Step-Down SWIFT™ Converter


TPS56121 is a high-efficiency and high-current synchronous buck converter designed to operate from a supply between 4.5 V and 14 V. The device is capable of producing an output voltage as low as 0.6 V at loads up to 25 A. Integrated NexFET™ Power MOSFETs provide a small footprint and ease of use.

The device implements a voltage-mode control with voltage feed-forward compensation that responds instantly to input voltage change.

TPS56121 is available in a thermally enhanced 22-pin PQFN (DQP) PowerPAD™ package.

The device offers design flexibility with a variety of user programmable functions, including soft-start, overcurrent protection (OCP) levels, and loop compensation. OCP levels are programmed by a single external resistor connected from the ILIM pin to the circuit ground. During the initial power-on sequence, the device enters a calibration cycle, measures the voltage at the ILIM 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. It then enters a shutdown/restart cycle until the fault is removed.


  • 4.5-V to 14-V Input Voltage Range
  • Incorporates Power Block Technology
  • Up to 25-A Output Current
  • Fixed Frequency Options of 300 kHz, 500 kHz and 1 MHz
  • High-Side and Low-Side MOSFET RDS(on) Sensing
  • Programmable Soft-Start
  • 600-mV Reference Voltage with 1% Accuracy
  • Voltage Mode Control with Feed-Forward
  • Supports Pre-Biased Output
  • Thermal Shutdown
  • 22-Pin 5 mm x 6 mm PQFN PowerPAD Package
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    Parametrics Evaluate all products in Step-Down (Buck) Converter

      TPS56121 Compare
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    Regulated Outputs (#) 1
    Vin (Min) (V) 4.5
    Vin (Max) (V) 14
    Vout (Min) (V) 0.6
    Vout (Max) (V) 12
    Iout (Max) (A) 15
    Iout2 (Max) (A) -
    Vout2 (Min) (V) -
    Vout2 (Max) (V) -
    Topology Buck
    • Boost
    • Buck
    • Buck-Boost
    • Inverting Buck-Boost
    Switching Frequency (Max) (kHz) 1000
    Switch Current Limit (Typ) (A) 21
    Iq (Typ) (mA) 2.5
    Duty Cycle (Max) (%) 93
    Soft Start Adjustable
    • Adjustable
    • Fixed
    • None
    Compensation External
    • External
    • Internal
    • Not Needed
    Special Features Enable
    Power Good
    Adjustable Current Limit
    Synchronous Rectification
    • Adjustable Current Limit
    • Adjustable UVLO
    • Dynamic Voltage Scaling
    • Enable
    • Frequency Synchronization
    • Light Load Efficiency
    • Phase Interleaving
    • Power Good
    • Synchronous Rectification
    • Tracking
    Control Mode Voltage Mode
    • COT with emulated ripple
    • Constant on-time (COT)
    • Current Mode
    • D-CAP
    • D-CAP+
    • D-CAP2
    • D-CAP3
    • Voltage Mode
    Preset Vout (V) -
    Vref Accuracy (Typ) (%) 1
    Rating Catalog
    • Automotive
    • Catalog
    • HiRel Enhanced Product
    • High Temp
    • Military
    • Space
    Operating Temperature Range (C) -40 to 125 °C to °C
    Approx. Price (US$) 3.50 | 1ku
    Package Group LSON-CLIP
    • CFP
    • DDPAK/TO-263
    • DSBGA
    • DSLGA
    • HTSSOP
    • MSOP-PowerPAD
    • PDIP
    • QFN
    • SO PowerPAD
    • SOIC
    • SON
    • SOT
    • SOT-23
    • TO-220
    • TO-263
    • TSSOP
    • USON
    • VQFN
    • VSON
    • VSSOP
    • WQFN
    • WSON
    • XCEPT
      Sample & Buy Reset Update

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    WEBENCH® TPS56121
        Min   Max   Range  
      Vin V    4.50 – 14.00V  
      Vout V    0.60 – 12.00V  
      Iout A    ≤ 15A  
      Ambient Temp °C    -40 – 125°C  
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