1 Features
• Total ionizing dose (TID) characterized
– Radiation hardness assurance (RHA)
availability of up to 100krad(Si)
• Single-Event Effects (SEE) characterized
– Single-event latchup (SEL), single-event
burnout (SEB), and single-event gate rupture
(SEGR) immune up to linear energy transfer
(LET) = 75MeV-cm2/mg
– Single-event functional interrupt (SEFI) and
single-event transient (SET) characterized up to
LET = 75MeV-cm2/mg
• Input voltage range from 4.5V to 14V
• 6A (TPS7H4012) or 3A (TPS7H4013) maximum
output current
• High efficiency (typical values for VIN = 12V,
VOUT = 3.3V, fSW = 500kHz)
– 88% at 1A
– 92% at 3A
– 91% at 6A
• Integrated 33mΩ (HS) and 27mΩ (LS) MOSFETs
(typ at 12V)
• Flexible switching frequency options:
– 100kHz to 1MHz, accurate (±15% or better),
adjustable internal oscillator
– 100kHz to 1MHz external sync capability
• 0.6V ± 0.83% voltage reference over line,
temperature, and radiation
• Supports 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
• Supports inverting buck-boost topology
• Plastic packages outgas tested per ASTM E595
• Available in military (–55°C to 125°C) temperature
range

2 Applications
• Space satellite point of load supply
• Satellite electrical power systems (EPS)
• Communications payload
• Radar imaging payload
• Radiation hardened power supplies

3 Description
The TPS7H401x devices are 14V synchronous
buck converters optimized for use in a space
environment. The TPS7H4012 is a 6A device and the
TPS7H4013 is a 3A device. The peak current mode
converter obtains high efficiency with good transient
performance and reduced component count.
The wide voltage range of the TPS7H401x enables
it to be used as a point of load regulator to convert
directly from a 12V or 5V rail. The output voltage
start-up ramp is controlled by the SS_TR pin. Power
sequencing is possible with the EN and PWRGD pins.
Additionally, various features are included such as
an optimized current limit for each device, a flexible
switching frequency, and configurable compensation.