1 Features

• Total ionizing dose (TID) characterized

– Radiation hardness assurance (RHA)

availability 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) = 75 MeV-cm2/mg

– Single-event functional interrupt (SEFI) and

single-event transient (SET) characterized up to

LET = 75MeV-cm2/mg

• Input voltage range from 3V to 7V

• Up to 3A of maximum output current per channel

or more when channels are paralleled

• Typical efficiency of 91.1% (typ.) at VIN = 5V, VOUT

= 1.8V, IOUT = 1A at fSW = 500kHz

• Integrated 62mΩ (HS) and 55mΩ (LS) MOSFETs

(typ. at VIN = 5V)

• Flexible switching frequency:

– 100kHz to 1MHz, internal oscillator

– External synchronization capability

• Accurate voltage reference of 599.48mV ± 1%

over line, temperature, and TID

• Monotonic start-up into pre-biased outputs

• Per channel (CHx)

– Adjustable slope compensation (RSCx)

– Adjustable soft-start (SS_TRx)

– Power-good output monitor for undervoltage

and overvoltage (PWRGDx)

– Input enable (ENx)

• Sequence up and reverse sequence down when

using EN_SEQ (only valid for TPS7H4104)

• Plastic packages outgas tested per ASTM E595

• Available in military (–55°C to 125°C) temp range

2 Applications

• Space satellite point of load supply

• Satellite electrical power systems (EPS)

• Radiation hardened power supplies

3 Description

The TPS7H4104 and TPS7H4102 are 7V, 3A

per channel, multichannel, peak-current mode,

synchronous buck converters optimized for use

in area sensitive, space environment applications.

The device incorporates four (TPS7H4104) or two

(TPS7H4102) identical channels that can be use to

step down the power input voltage into independent

voltages up to 3A per phase or interleaved to

increment the output current up to 12A (TPS7H4104)

or 6A (TPS7H4102).

Each channel incorporate the high and low side

power MOSFETs with programmable soft-start and

slope compensation. Additionally, per channel powergood

flags and enable signals are provided. The

TPS7H4104 also incorporates an input (EN_SEQ) to

create a sequential power up and reverse sequence

down.

Various current limit mechanisms are included

for robust current limiting during fault conditions.

Thermal shutdown disables the device when the die

temperature exceeds thermal limit.