ST2042 Description
Doc ID 9679 Rev 6 3/13
1 Description
The ST2042 power distribution switches is intended for application where heavy capacitive
loads and short-circuits are likely to be encountered. These devices incorporate 80 mΩ.
N-channel MOSFET high-side power switches for power-distribution systems that require
multiple powers switches in a single package. Each switch is controlled by an independent
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,
these devices limit the output current to a safe level by switching into a constant-current
mode, pulling the overcurrent (OCx) logic output low.
A 10 ms deglitching circuit provides fault-blanking feature, preventing the OC_N pin to be
asserted during hot-insertion or short spikes of overcurrent conditions. 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. These power-distribution switches are designed to current limit at 0.9 A.
Obsolete Product(s) - Obsolete Product(s)
