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,
KGD (known good die), and HTSSOP (QMLP)
options
• 0.6-V ±1.7% voltage reference over temperature,
radiation, and line and load regulation for HTSSOP
(SHP) 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.