1A loading, 2.7-5.5V, 70mΩ USB power switch, active-high, output discharge

The TPS206x-1 power-distribution switches are

intended for applications where heavy capacitive loads and short-circuits are likely to be

encountered. This device incorporates 70mΩ 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 2.7V.

These switches provide a discharge function that provides a controlled discharge of the output voltage stored on the output capacitor.

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 1.5A typically.