Description

The TPS7H4002-SP is a radiation hardened, 5.5-V, 3-A synchronous step-down converter, which isoptimized

for small designs through high efficiencyand by integrating the high-side and low-sideMOSFETs. Further

space savings are achievedthrough current mode control, which reducescomponent count, and a high

switching frequency,which reduces the inductor footprint.The output voltage startup ramp is controlled by

theSS/TR pin which allows operation as either a standalone power supply or in tracking situations. Power

sequencing is also possible by correctly configuringthe enable and the open drain power good pins. Inaddition,

the TPS7H4002-SP can be configured inprimary-secondary mode for parallel operation.Cycle-by-cycle current

limiting on the high-sideFET protects the device in overload situations andis enhanced by a low-side sourcing

current limitwhich prevents current runaway. There is also alow-side sinking current limit which turns off thel

ow-side MOSFET to prevent excessive reversecurrent. Thermal shutdown disables the part when dietemperature

exceeds thermal limit.

Features

• Radiation performance:

– Radiation-hardness-assured up toTID 100 krad(Si)

– SEL, SEB, and SEGR immune toLET = 75 MeV-cm2/mg

– SET and SEFI characterized up toLET = 75 MeV-cm2/mg

• Peak efficiency: 96.9% (VO = 2.5 V)

• Integrated 50-mΩ and 35-mΩ MOSFETs

• Power rail: 3 to 5.5 V on VIN

• 3-A maximum output current

• Flexible switching frequency options:

– 100-kHz to 1-MHz adjustable internal oscillator

– External sync capability: 100 kHz to 1 MHz

– SYNC pin can be configured as a 500-kHzoutput for primary-secondary applications

• 0.807-V ±1.5% voltage reference overtemperature, radiation, and line and loadregulation

• Monotonic start-up into prebiased outputs

• Adjustable soft start through external capacitor

• Input enable and power-good output for powersequencing

• Power good output monitor for undervoltage andovervoltage

• Adjustable input undervoltage lockout (UVLO)

• 20-pin ultra-small, thermally-enhanced ceramicflatpack package (HKH) for space applications