1 Features

• 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% (VO = 1 V at 100 kHz)

• 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 for CDFP

and KGD options

• 0.6-V ±1.7% voltage reference over temperature,

radiation, and line and load regulation for HTSSOP

option

• Monotonic start-up into prebiased outputs

• Adjustable slope compensation and soft-start

• Adjustable input enable and power-good output for

power sequencing

2 Applications

• Space satellite point of load supply

3 Description

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.

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. Thermal shutdown

disables the part when die temperature exceeds

thermal limit.