4.5V to 18V Input, 20A Synchronous Buck Controller with Power Good, 300kHz


Product details


Vin (Min) (V) 4.5 Vin (Max) (V) 18 Vout (Min) (V) 0.591 Vout (Max) (V) 14.4 Iout (Max) (A) 20 Iq (Typ) (mA) 2.5 Switching frequency (Min) (kHz) 300 Switching frequency (Max) (kHz) 300 Features Enable, Power Good, Pre-Bias Start-Up, Synchronous Rectification Operating temperature range (C) -40 to 85 Regulated outputs (#) 1 Number of Phases 1 Rating Catalog open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

VSON (DRC) 10 9 mm² 3 x 3 open-in-new Find other Buck controllers (external switch)


  • Input Operating Voltage Range: 4.5 V to 18 V
  • Up to 20-A Output Currents
  • Supports Pre-Biased Outputs
  • 0.5%, 591-mV Reference
  • Switching Frequency
    • TPS40192: 600 kHz
    • TPS40193: 300 kHz
  • Three Selectable Thermally Compensated Short-Circuit Protection Levels
  • Hiccup Restart from Faults
  • Internal 5-V Regulator
  • High-Side and Low-Side MOSFET ON-resistance (RDS(on)) Current Sensing
  • 10-Pin 3 mm × 3 mm SON Package
  • Internal 4-ms Soft-Start Time
  • Thermal Shutdown Protection at 145°C

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TPS40192 and TPS40193 are cost-optimized synchronous buck controllers that operate from 4.5 V to 18 V input. These controllers implement a voltage-mode control architecture with the switching frequency fixed at either 600 kHz (TPS40192) or 300 kHz (TPS40193). The higher switching frequency facilitates the use of smaller inductor and output capacitors, thereby providing a compact power-supply solution. An adaptive anti-cross conduction scheme is used to prevent shoot through current in the power FETs.

Short circuit detection is done by sensing the voltage drop across the low-side MOSFET when it is on and comparing it with a user selected threshold of 100 mV, 200 mV or 280 mV. The threshold is set with a single external resistor connected from COMP to GND. This resistor is sensed at startup and the selected threshold is latched. Pulse-by-pulse limiting (to prevent current runaway) is provided by sensing the voltage across the high-side MOSFET when it is on and terminating the cycle when the voltage drop rises above a fixed threshold of 550 mV. When the controller senses an output short circuit, both MOSFETs are turned off and a timeout period is observed before attempting to restart. This behavior provides limited power dissipation in the event of a sustained fault.

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Technical documentation

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Type Title Date
* Datasheet TPS4019x 4.5-V to 18-V Input, Voltage-Mode, Synchronous Buck Controller With Power Good datasheet (Rev. H) May 23, 2019
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Selection guides DC/DC Buck Controller Solutions Selection Guide Feb. 06, 2018
Application notes Enabling Multiple TPS4019x Devices Mar. 29, 2012
User guides Using the TPS40193EVM-001 May 08, 2007

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

SLVC171.ZIP (79 KB) - PSpice Model
SLVC172A.ZIP (12 KB) - TINA-TI Reference Design
SLVM013.ZIP (3 KB) - TINA-TI Spice Model
SLVM075.ZIP (97 KB) - TINA-TI Spice Model
SLUC263D.ZIP (131 KB)

Reference designs

36VDC - 75VDC Input, 3.3V@3A Output Isolated Flyback and Synchronous Buck
PMP4113 — This reference design uses the UCC2809 to control an isolated flyback that converts a standard 48V telecom input to an isolated 80V. An additional winding on the secondary of the flyback transformer generates an unregulated 12V rail. The TPS40193 controls a synchronous buck that generates a 3.3V/3A (...)
5V-18VDC Input, 3.3V/3A Synchronous Buck Converter
PMP4771 — This reference design uses the TPS40193 synchronous buck controller to generate a 3.3V/3A output with a peak efficiency of over 96%. The input range is 5V to 18Vdc. The circuit components consume an area less than 10mm x 45mm on one side of a PCB.

CAD/CAE symbols

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VSON (DRC) 10 View options

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