ST2054 Current limited Power distribution switches Features 80m high-side MOSFET switch 500mA continuos current per channel independent thermal and short-circuit protection with overcurrent logic output Operating range from 2.7V to 5.5V CMOS- and TTL-compatible enable inputs SO-16 10ms OC N fault blanking 2.5ms typical rise time Under voltage lock out When the output load exceeds the current-limit 20A maximum standby supply current threshold or a short is present, these devices limit Ambient temperature range, -40C to 85C the output current to a safe level by switching into ESD protection a constant-current mode, pulling the overcurrent (OCx) logic output low. A 10ms deglitching circuit provides fault-blanking feature, preventing the Description OC N pin to be asserted during hot-insertion or short spikes of overcurrent conditions. The ST2054 power distribution switches is intended for application where heavy capacitive When continuous heavy overloads and short loads and short circuits are likely to be circuits increase the power dissipation in the encountered. These devices incorporate 80m switch, causing the junction temperature to rise, a N-channel MOSFET high-side power switches for thermal protection circuit shuts off the switch to power-distribution systems that require multiple prevent damage. Recovery from a thermal powers switches in a single package. Each switch shutdown is automatic once the device has is controlled by an independent logic enable input. cooled sufficiently. Internal circuitry ensures the Gate drive is provided by an internal charge pump switch remains off until valid input voltage is designed to control the power-switch rise times present. These power-distribution switches are and fall times to minimize current surges during designed to current limit at 0.9 A. switching. The charge pump requires no external components and allows operation from supplies as low as 2.7 V. Table 1. Device summary Part number Package Packaging Tube ST2054BD SO-16 (50 parts per tube, 40 tube per box) ST2054BDR SO-16 Tape and reel (2500 parts per reel) May 2007 Rev 4 1/13 www.st.com 13 Obsolete Product(s) - Obsolete Product(s) Contents ST2054 Contents 1 Block diagram 3 2 Pin connections . 4 3 Electrical ratings 5 3.1 Absolute maximum ratings . 5 3.2 Recommended operating conditions . 5 4 Electrical characteristics . 6 5 Package mechanical data . 9 6 Revision history . 12 2/13 Obsolete Product(s) - Obsolete Product(s)