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TPS2838

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4-A, 29-V half bridge gate driver with adjustable regulator for non-inverting synchronous buck

Product details

Bootstrap supply voltage (max) (V) 29 Power switch MOSFET Input supply voltage (min) (V) 10 Input supply voltage (max) (V) 15 Peak output current (A) 4 Operating temperature range (°C) -40 to 125 Undervoltage lockout (typ) (V) 10 Rating Catalog Propagation delay time (µs) 0.02 Rise time (ns) 10 Fall time (ns) 10 Iq (mA) 0.425 Input threshold TTL Channel input logic CMOS Switch node voltage (V) 0 Features Dead time control, Enable, Synchronous Rectification Driver configuration Noninverting
Bootstrap supply voltage (max) (V) 29 Power switch MOSFET Input supply voltage (min) (V) 10 Input supply voltage (max) (V) 15 Peak output current (A) 4 Operating temperature range (°C) -40 to 125 Undervoltage lockout (typ) (V) 10 Rating Catalog Propagation delay time (µs) 0.02 Rise time (ns) 10 Fall time (ns) 10 Iq (mA) 0.425 Input threshold TTL Channel input logic CMOS Switch node voltage (V) 0 Features Dead time control, Enable, Synchronous Rectification Driver configuration Noninverting
HTSSOP (PWP) 16 32 mm² 5 x 6.4
  • Integrated Drive Regulator (4 V to 14 V)
  • Adjustable/Adaptive Dead-Time Control
  • 4-A Peak current at VDRV of 14 V
  • 10-V to 15-V Supply Voltage Range
  • TTL-Compatible Inputs
  • Internal Schottky Diode Reduces Part Count
  • Synchronous or Nonsynchronous Operation
  • Inverting and Noninverting Options
  • TSSOP PowerPad™ Package for Excellent Thermal Performance
  • APPLICATIONS
    • Single or Multiphase Synchronous-Buck Power Supplies
    • High-Current DC/DC Power Modules

PowerPAD is a trademark of Texas Instruments.

  • Integrated Drive Regulator (4 V to 14 V)
  • Adjustable/Adaptive Dead-Time Control
  • 4-A Peak current at VDRV of 14 V
  • 10-V to 15-V Supply Voltage Range
  • TTL-Compatible Inputs
  • Internal Schottky Diode Reduces Part Count
  • Synchronous or Nonsynchronous Operation
  • Inverting and Noninverting Options
  • TSSOP PowerPad™ Package for Excellent Thermal Performance
  • APPLICATIONS
    • Single or Multiphase Synchronous-Buck Power Supplies
    • High-Current DC/DC Power Modules

PowerPAD is a trademark of Texas Instruments.

The TPS2838/39/48/49 devices are MOSFET drivers designed for high-performance synchronous power supplies. The drivers can source and sink up to 4-A peak current at a 14-V drive voltage. These are ideal devices to use with power supply controllers that do not have on-chip drivers. The low-side driver is capable of driving loads of 3.3 nF in 10-ns rise/fall times and has 40-ns propagation delays at room temperature.

The MOSFET drivers have an integrated 150-mA regulator, so the gate drive voltage can be optimized for specific MOSFETs. The TPS2848 and TPS2849 have a fixed 8-V drive regulator, while the TPS2838/39 allow the drive regulator to be adjusted from 4 V to 14 V by selection of two external resistors.

The devices feature VDRV to PGND shoot-through protection with adaptive/adjustable deadtime control. The deadtime, for turning on the high-side FET from LOWDR transitioning low, is adjustable with an external capacitor on the DELAY pin. This allows compensation for the effect the gate resistor has on the synchronous FET turn off. The adaptive deadtime prevents the turning on of the low-side FET until the voltage on the BOOTLO pin falls below a threshold after the high-side FET stops conducting. The high-side drive can be configured as a ground referenced driver or a floating bootstrap driver. The internal Schottky diode minimizes the size and number of external components needed for the bootstrap driver circuit. Only one external ceramic capacitor is required to configure the bootstrap driver.

The SYNC pin can be used regardless of load to disable the synchronous FET driver and operate the power supply nonsynchronously.

A power ready/undervoltage lockout function outputs the status of the VCC-pin voltage and driver regulator output on the open-drain PWRRDY pin. This feature can be used to enable a controller\x92s output once the VCC voltage reaches the threshold and the regulator output is stable. This function ensures both FET drivers are off when the VCC voltage is below the voltage threshold.

The TPS2838/39/48/49 devices are offered in the thermally enhanced 14-pin and 16-pin PowerPAD TSSOP package. The PowerPAD package features an exposed leadframe on the bottom that can be soldered to the printed-circuit board to improve thermal efficiency. The TPS2838/48 are noninverting control logic while the TPS2839/49 drivers are inverting control logic.

The TPS2838/39/48/49 devices are MOSFET drivers designed for high-performance synchronous power supplies. The drivers can source and sink up to 4-A peak current at a 14-V drive voltage. These are ideal devices to use with power supply controllers that do not have on-chip drivers. The low-side driver is capable of driving loads of 3.3 nF in 10-ns rise/fall times and has 40-ns propagation delays at room temperature.

The MOSFET drivers have an integrated 150-mA regulator, so the gate drive voltage can be optimized for specific MOSFETs. The TPS2848 and TPS2849 have a fixed 8-V drive regulator, while the TPS2838/39 allow the drive regulator to be adjusted from 4 V to 14 V by selection of two external resistors.

The devices feature VDRV to PGND shoot-through protection with adaptive/adjustable deadtime control. The deadtime, for turning on the high-side FET from LOWDR transitioning low, is adjustable with an external capacitor on the DELAY pin. This allows compensation for the effect the gate resistor has on the synchronous FET turn off. The adaptive deadtime prevents the turning on of the low-side FET until the voltage on the BOOTLO pin falls below a threshold after the high-side FET stops conducting. The high-side drive can be configured as a ground referenced driver or a floating bootstrap driver. The internal Schottky diode minimizes the size and number of external components needed for the bootstrap driver circuit. Only one external ceramic capacitor is required to configure the bootstrap driver.

The SYNC pin can be used regardless of load to disable the synchronous FET driver and operate the power supply nonsynchronously.

A power ready/undervoltage lockout function outputs the status of the VCC-pin voltage and driver regulator output on the open-drain PWRRDY pin. This feature can be used to enable a controller\x92s output once the VCC voltage reaches the threshold and the regulator output is stable. This function ensures both FET drivers are off when the VCC voltage is below the voltage threshold.

The TPS2838/39/48/49 devices are offered in the thermally enhanced 14-pin and 16-pin PowerPAD TSSOP package. The PowerPAD package features an exposed leadframe on the bottom that can be soldered to the printed-circuit board to improve thermal efficiency. The TPS2838/48 are noninverting control logic while the TPS2839/49 drivers are inverting control logic.

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Technical documentation

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Type Title Date
* Data sheet Synchronous-Buck MOSFET Drivers with Drive Regulator datasheet (Rev. A) 14 Jun 2001
Application brief External Gate Resistor Selection Guide (Rev. A) 28 Feb 2020
Application brief Understanding Peak IOH and IOL Currents (Rev. A) 28 Feb 2020
Application note Optimizing MOSFET Characteristics by Adjusting Gate Drive Amplitude (Rev. A) 14 Nov 2018
More literature Fundamentals of MOSFET and IGBT Gate Driver Circuits (Replaces SLUP169) (Rev. A) 29 Oct 2018
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
User guide UCC38C42 30-W Synchronous Buck Converter Reference Design 04 Feb 2003

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