1 Features

? Total ionizing dose (TID) characterized to 30

krad(Si)

– TID RLAT (radiation lot acceptance testing) for

every wafer lot to 20 krad(Si)

? Single-event effects (SEE) characterized

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

burnout (SEB) and single-event gate rupture

(SEGR) immune to effective linear energy

transfer (LETEFF) of 43 MeV– cm2/mg.

– Single-event transient (SET) and single-event

functional interrupt (SEFI) characterized to

LETEFF of 43 MeV– cm2/mg.

? Input operating voltage range (VIN): 1.6 to 5.5 V

? Recommended continuous current (IMAX): 1.25 A

? On-resistance (RON):

– 116 mΩ (typ.) at VIN = 5 V

– 115 mΩ (typ.) at VIN = 3.3 V

– 133 mΩ (typ.) at VIN = 1.8 V

? Output short protection (ISC): 3 A (typ.)

? Low power consumption:

– ON state (IQ): 8.2 μA (typ.)

– OFF state (ISD): 2 nA (typ.)

? Slow turn ON timing to limit inrush current (tON):

– tON at 5 V = 1.67 ms at 3.65 mV/μs

– tON at 3.3 V = 1.5 ms at 2.94 mV/μs

– tON at 1.8 V = 1.31 ms at 2.18 mV/μs

? Adjustable output discharge and fall time:

– Internal QOD resistance = 6 Ω (typ.)

? Space Enhanced Plastic (SEP)

– Controlled baseline

– Gold bondwire

– NiPdAu lead finish

– One assembly and test site

– One fabrication site

– Military (–55°C to 125°C) temperature range

– Extended product life cycle

– Extended product-change notification (PCN)

– Product traceability

– Enhance mold compound for low outgassing

2 Applications

? Space satellite power management and

distribution

? Radiation tolerant power tree applications

? Enables switching power rails for controller power

up and power down

? Satellite electrical power systems (EPS)

3 Description

The TPS7H2221-SEP device is a small, single

channel load switch with controlled slew rate. The

device contains an N-channel MOSFET that can

operate over an input voltage range of 1.6 V to 5.5

V and can support a maximum continuous current of

1.25 A.

The switch ON state is controlled by a digital input

that is capable of interfacing directly with low-voltage

control signals. When power is first applied, a Smart

Pull Down is used to keep the ON pin from floating

until system sequencing is complete. Once the pin

is deliberately driven high (VON>VIH), the Smart Pull

Down will be disconnected to prevent unnecessary

power loss.

The TPS7H2221-SEP load switch is also selfprotected,

meaning that it protects against short circuit

events on the output of the device.

The TPS7H2221-SEP is available in a standard

SC-70 package characterized for operation over an

ambient temperature range of –55°C to 125°C.