1 Features

• 5962R14228 (1):

– Radiation hardness assurance (RHA) qualified

to total ionizing dose (TID) 100 krad(Si)

– Single event latch-up (SEL), single event gate

rupture (SEGR), single event burnout (SEB)

immune to LET = 70 MeV-cm2/mg(2)

– Single event transient (SET), single event

functional interrupt (SEFI), and single event

upset (SEU) characterized to 70 MeV-cm2/mg(2)

• Supports DDR, DDR2, DDR3, DDR3L, and DDR4

termination applications

• Input voltage: supports a 2.5-V and 3.3-V rail(3)

• Separate low-voltage input (VLDOIN) down to

0.9 V for improved power efficiency(3)

• 3-A sink and source termination regulator includes

droop compensation

• Enable input and power-good output for power

supply sequencing

• VTT termination regulator

– Output voltage range: 0.5 to 1.75 V

– 3-A sink and source current

• Integrated precision voltage divider network with

sense input

• Remote sensing (VTTSNS)

• VTTREF buffered reference

– 49% to 51% accuracy with respect to

VDDQSNS (±3 mA)

– ±10-mA sink and source current

• Undervoltage lockout (UVLO) and overcurrent limit

(OCL) functionality integrated

2 Applications

• Command and data handling (C&DH)

• Optical imaging payload

• Radar imaging payload

3 Description

The TPS7H3301-SP is a TID and SEE radiationhardened

double data rate (DDR) 3-A termination

regulator with built-in VTTREF buffer. The regulator is

specifically designed to provide a complete, compact,

low-noise solution for space DDR termination

applications such as single board computers, solid

state recorders, and payload processing.

The TPS7H3301-SP supports DDR VTT termination

applications using DDR, DDR2, DDR3, DDR4. The

fast transient response of the TPS7H3301-SP VTT

regulator allows for a very stable supply during read/

write conditions. During transients, the fast tracking

feature of the VTTREF supply minimizes any voltage

offset between VTT/Vo and VTTREF. To enable

simple power sequencing, both an enable input and

a power-good output (PGOOD) have been integrated

into the TPS7H3301-SP. The PGOOD output is

open-drain so it can be tied to multiple open-drain

outputs to monitor when all supplies have come into

regulation. The enable signal can also be used to

discharge VTT/Vo during suspend to RAM (S3) power

down mode.