4.5-V to 25-V, synchronous buck controller with three operating modes

A newer version of this product is available
Same functionality with different pin-out to the compared device.
TPS40345 ACTIVE 3-V to 20-V, 25-A, synchronous buck controller for cost-optimized applications This upgraded product offers a smaller QFN package.

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Package | Pins | Size

SSOP (DB) 20 38 mm² 5.3 x 7.2 open-in-new Find other Buck controllers (external switch)


  • Step-Down DC-DC Converter
  • Three Operation-Modes
    • Heavy Load:
      • Fixed Frequency PWM
      • Hysteretic (User Selectable)
    • Light Load:
      • Skip Mode
  • 4.5-V to 25-V Input Voltage Range
  • Adjustable Output Voltage Down to 1.2 V
  • 95% Efficiency
  • Standby Control
  • Overcurrent Protection
  • UVLO for Internal 5-V Regulation
  • Low-Standby Current . . . 0.5 mA Typical
  • TA = -40°C to 85°C
open-in-new Find other Buck controllers (external switch)


The TPS5103 is a synchronous buck dc/dc controller, designed for notebook PC system power. The controller has three user-selectable operation modes available: hysteretic mode, fixed-frequency PWM control, or SKIP control.

In high-current applications, where fast transient response is advantageous for reducing bulk capacitance, the hysteretic mode is selected by connecting the RT pin to VREF5. Selecting the PWM/SKIP modes for less demanding transient applications is ideal for conserving notebook battery life under light load conditions. The device includes high-side and low-side MOSFET drivers capable of driving low r ds(on) N-channel MOSFETs.

The user-selectable overcurrent protection (OCP) threshold is set by an external TRIP-pin resistor in order to protect the system. The TPS5103 is configured so that a current-sense resistor is not required, improving the operating efficiency.

open-in-new Find other Buck controllers (external switch)

Technical documentation

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* Data sheet Multiple Mode Synchronous DC/DC Controller datasheet (Rev. A) May 16, 2001

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