The TPS2045 and TPS2055 power-distribution switches are intended for applications where heavy capacitive loads and short circuits are likely. Each of these 135-m N-channel MOSFET high-side power switches is controlled by a logic enable compatible with 5-V and 3-V logic. Gate drive is provided by an internal charge pump that controls 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 TPS2045 and TPS2055 limit the output current to a safe level by switching into a constant-current mode, pulling the overcurrent (OC\\) 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 in overcurrent 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.
●The TPS2045 and TPS2055 are designed to limit at 0.44-A load. These power-distribution switches, available in 8-pin small-outline integrated circuit (SOIC) and 8-pin plastic dual-in-line packages (PDIP), operate over an ambient temperature range of -40°C to 85°C.
● 135-m -Maximum (5-V Input) High-Side MOSFET Switch
● 250 mA Continuous Current
● Short-Circuit and Thermal Protection With Overcurrent Logic Output
● Operating Range...2.7-V to 5.5-V
● Logic-Level Enable Input
● 2.5-ms Typical Rise Time
● Undervoltage Lockout
● 10 uA Maximum Standby Supply Current
● Bidirectional Switch
● Available in 8-pin SOIC and PDIP Packages
● Ambient Temperature Range, -40°C to 85°C
● 2-kV Human-Body-Model, 200-V Machine-Model ESD Protection
●## typical applications
● Notebook, Desktop and Palmtop PCs
● Monitors, Keyboards, Scanners, and Printers
● Digital Cameras, Phones, and PBXs
● Hot-Insertion Applications
