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)

– 94% at 1A

– 86% at 9A

– 82% at 12A

• Integrated 45mΩ (HS) and 33mΩ (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

– SYNC pins can be configured 90° out of phase

to parallel up to 4 devices

• 0.6V ± 0.67% 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 5V to –5V 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.