TPS7H4001-SP

• Radiation performance:
  • Radiation-hardness-assured up to TID 100 krad(Si)
  • SEL, SEB, and SEGR immune to LET = 75 MeV-cm²/mg
  • SET and SEFI characterized up to LET = 75 MeV-cm²/mg
• Peak efficiency: 95.5% (V_O = 1 V at 100 kHz)
• Integrated 22-mΩ and 17-mΩ MOSFETs
• Power rail: 3 V to 7 V on VIN
• Flexible switching frequency options:
  • 100-kHz to 1-MHz adjustable internal oscillator
  • External sync capability: 100-kHz to 1-MHz
  • SYNC pins can be configured as 500-kHz clocks at 90° out of phase to parallel up to 4 devices
• 0.6-V ±1.5% voltage reference over temperature, radiation, and line and load regulation
• Monotonic start-up into prebiased outputs
• Adjustable slope compensation and soft-start
• Adjustable input enable and power-good output for power sequencing
• Power-good output monitor for undervoltage and overvoltage
• 34-pin, thermally-enhanced ceramic flatpack package (HKY) for space applications

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The TPS7H4001-SP is a radiation-hardness-assured, 7-V, 18-A synchronous buck converter with integrated low-resistance high-side and low-side MOSFETs in a thermally enhanced 34-pin ceramic flatpack package. High efficiency and reduced component count are achieved through current mode control.

The output voltage start-up ramp is controlled by the SS/TR pin which allows operation as either a stand alone power supply or in tracking situations. Power sequencing is possible by correctly configuring the enable and the power good pins. The TPS7H4001-SP can be configured in primary-secondary mode and with the SYNC2 pin, four devices can be configured in parallel without an external clock.

Cycle-by-cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current protection which prevents current runaway. There is also a low-side sinking current protection which turns off the low-side MOSFET to prevent excessive reverse current. Thermal shutdown disables the part when die temperature exceeds thermal limit.