Texas Instruments TPS2045, TPS2055 Current-Limited Power-Distribution Switches Data Sheet Manual

查询TPS2045D供应商 TPS2045, TPS2055

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 – APRIL 1999

features typical applications 135-mΩ -Maximum (5-V Input) High-Side Notebook, Desktop and Palmtop PCs MOSFET Switch

Monitors, Keyboards, Scanners, and

250 m A Continuous Current Printers Short-Circuit and Thermal Protection With Digital Cameras, Phones, and PBXs Overcurrent Logic Output

Hot-Insertion Applications

Operating Range 2.7-V to 5.5-V Logic-Level Enable Input

TPS2045 TPS2055 2.5-ms Typical Rise Time D OR P PACKAGE D OR P PACKAGE (TOP VIEW) (TOP VIEW)

Undervoltage Lockout

10 µA Maximum Standby Supply Current GND OUT GND OUT IN OUT IN OUT

Bidirectional Switch

IN OUT IN OUT

Available in 8-pin SOIC and PDIP Packages

EN OC EN OC

Ambient Temperature Range, –40°C to 85°C 2-k V Human-Body-Model, 200-V Machine-Model ESD Protection

description The TPS2045 and TPS2055 power-distribution switches are intended for applications where heavy capacitive loads and short circuits are likely. Each of these 135-mΩ 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.

AVAILABLE OPTIONS

RECOMMENDED PACKAGED DEVICES

TYPICAL SHORT-CIRCUIT

MAXIMUM CONTINUOUS

TA ENABLE CURRENT LIMIT AT 25°C

LOAD CURRENT SOIC PDIP

–40°C to 85°C Active low 0.25 0.44 TPS2045D TPS2045P –40°C to 85°C Active high 0.25 0.44 TPS2055D TPS2055P The D package is available taped and reeled. Add an R suffix to device type (e.g., TPS2045DR)

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Copyright  1999, Texas Instruments Incorporated This document contains information on products in more than one phase

of development. The status of each device is indicated on the page(s) specifying its electrical characteristics.

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