The TPS20xxB-Q1 power-distribution switches are intended for applications where heavy
capacitive loads and short circuits are likely to be encountered. These devices incorporate 70-mΩ
N-channel MOSFET power switches for power-distribution systems that require multiple power switches
in a single package. Each switch is controlled by a logic enable input. Gate drive is provided by
an internal charge pump designed to control the power-switch rise times and fall times to minimize
current surges during switching. The charge pump requires no external components and allows
operation from supplies as low as 2.7 V.
When the output load exceeds the current-limit threshold or a short is present, the
device limits the output current to a safe level by switching into a constant-current mode, pulling
the overcurrent (OCx) logic output low. When continuous heavy overloads and
short circuits increase the power dissipation in the switch, causing the junction temperature to
rise, a thermal protection circuit shuts off the switch to prevent damage. Recovery from a thermal
shutdown is automatic once the device has cooled sufficiently. Internal circuitry ensures that the
switch remains off until valid input voltage is present. This power-distribution switch is designed
to set current limit at 1 A (typical).
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