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Texas Instruments TPS56425xx 600KHz Synchronous Step-Down Converters

Texas Instruments TPS56425xx 4A 600KHz Synchronous Step-Down Converters are simple, easy-to-use, high-efficiency, high-power-density synchronous buck converters with an input voltage range of 3V to 17V and support up to 4A continuous current at output voltages between 0.6V and 10V.

The Texas Instruments TPS56425xx employs D-CAP3 control mode to support low-ESR output capacitors and provide a fast transient response without requiring external compensation. The device can support up to 97% duty cycle operation.

The TPS564252B and TPS564252C operate in Eco-mode, which maintains high efficiency during light loading. The TPS564257B and TPS564257C operate in FCCM mode, which maintains low output ripple and the same frequency across all load conditions. The TPS564255B operates in OOA mode, which prevents audio noise generation. The devices integrate comprehensive protection via OVP, OCP, UVLO, OTP, and UVP, with hiccup.

The device is available in a 1.6mm × 1.6mm SOT-563 package with a junction temperature of –40°C to +125°C.

Features

  • Configured for a wide range of applications
    • 3V to 17V input voltage range
    • 0.6V to 10V output voltage range
    • 0.6V reference voltage
    • ±1% reference accuracy at 25°C
    • ±1.5% reference accuracy at –40°C to 125°C
    • Integrated 55.0mΩ and 24.3mΩ MOSFETs
    • 100µA low quiescent current
    • 600kHz switching frequency TPS564252B, TPS564255B, TPS564257B
    • 1.2MHz switching frequency TPS564252C, TPS564257C
    • Maximum 97% large duty cycle operation for TPS564252B, TPS564255B, TPS564257B
    • Maximum 95% large duty cycle operation for TPS564252C, TPS564257C
    • Precision EN threshold voltage
    • 1.6ms fixed typical soft-start time
  • Ease of use and small design size
    • TPS564252B, TPS564252C Eco-mode, TPS564257B, TPS564257C FCCM mode, TPS564255B Out-of-Audio™ (OOA) mode at light loading
      D-CAP3™ control mode
    • Easy layout with integrated bootstrap capacitor
    • Supports start-up with prebiased output
    • Non-latch for OV, OT, and UVLO protection
    • Hiccup mode for UV protection
    • Cycle-by-cycle OC and NOC protection
    • 1.6mm × 1.6mm SOT-563 package

Applications

  • WLAN/Wi-Fi access point, switch, router
  • Pro-audio, surveillance, drone
  • TV, STB, DVR, and smart speaker
  • Solid state drive (SSD)
  • Electricity meter

Functional Block Diagram

Block Diagram - Texas Instruments TPS56425xx 600KHz Synchronous Step-Down Converters
Published: 2026-09-08 | Updated: 2026-09-16