Description

ST2051

2/10

Doc ID 12593 Rev 3

1

Description

The ST2051 power distribution switch is intended for applications where heavy capacitive

loads and short-circuits are likely to be encountered. These devices incorporate 90 m

Ω

N-channel MOSFET high-side power switches for power-distribution. The 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 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 the switch

remains off until valid input voltage is present.

Obsolete

Product(s)

- Obsolete

Product(s)