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ST2042 Scheda tecnica(PDF) 1 Page - STMicroelectronics |
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ST2042 Scheda tecnica(HTML) 1 Page - STMicroelectronics |
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1 / 12 page  May 2007 Rev 5 1/12 12 Features ■ 80mΩ high-side MOSFET switch ■ 500mA continuos current per channel ■ Thermal and short-circuit protection with overcurrent logic output ■ Operating range from 2.7V to 5.5V ■ CMOS- and TTL-compatible enable inputs ■ 10ms OC_N fault blanking ■ 2.5ms typical rise time ■ Under voltage lock out ■ 10µA maximum standby supply current ■ Ambient temperature range, -40°C to 85°C ■ Fault-blanking 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 80m . 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 10ms 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. SO-8 ST2042 Enhanced power switch www.st.com Table 1. Device summary Part number Package Packaging ST2042BD SO-8 Tube (50 parts per tube, 40 tube per box) ST2042BDR SO-8 Tape and reel (2500 parts per reel) |
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