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
• 12A maximum output current
• High efficiency (typical values for VIN = 12V,
VOUT = 3.3V, fSW = 500kHz)
– 91% (CFP), 91% (plastic) at 2A
– 87% (CFP), 88% (plastic) at 9A
– 85% (CFP), 86% (plastic) at 12A
• Integrated HS 45mΩ(CFP)/31mΩ(plastic) and LS
33mΩ(CFP)/27mΩ(plastic) MOSFETs (typ at 12V)
• Flexible switching frequency options:
– 100kHz to 1MHz, accurate (±15% or better),
adjustable internal oscillator
– 100kHz to 1MHz external sync capability
– SYNC pins can be configured 90° out of phase
to parallel up to 4 devices
• 0.6V ±0.67% (CFP), ±0.83% (plastic) voltage
reference over line, temperature, and radiation
• Differential remote sensing
• Selectable current limit
• FAULT input pin for flexible fault management
• 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
• 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 TPS7H4011 is a 14V, 12A synchronous buck
converter optimized for use in a space environment.
The peak current mode converter obtains high
efficiency with good transient performance and
reduced component count.
The wide voltage range of the TPS7H4011 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.
The device can be configured with up-to four devices
in parallel without an external clock for increased
current capabilities. Additionally, various features
are included such as differential remote sensing,
selectable current limit, a flexible fault input pin, and
configurable compensation.