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.