Texas Instruments TPS2046, TPS2056 Dual Current-Limited Power-Distribution Switches User Manual

查询TPS2046D供应商 TPS2046, TPS2056

DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS183 – 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 per Channel Printers Independent Short-Circuit and Thermal Digital Cameras, Phones, and PBXs Protection With Overcurrent Logic Output

Hot-Insertion Applications

Operating Range 2.7-V to 5.5-V Logic-Level Enable Input 2.5-ms Typical Rise Time TPS2046 TPS2056

D OR P PACKAGE D OR P PACKAGE

Undervoltage Lockout

(TOP VIEW) (TOP VIEW)

10 µA Maximum Standby Supply Current

GND OC1 GND OC1

Bidirectional Switch

IN OUT1 IN OUT1

Available in 8-pin SOIC and PDIP Packages

EN1 OUT2 EN1 OUT2

Ambient Temperature Range, –40°C to 85°C

EN2 OC2 EN2 OC2

2-k V Human-Body-Model, 200-V Machine-Model ESD Protection

description The TPS2046 and TPS2056 dual power-distribution switches are intended for applications where heavy capacitive loads and short circuits are likely. These devices incorporate in single packages two 135-mΩ N-channel MOSFET high-side power switches for power-distribution systems that require multiple power switches. Each switch 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 TPS2046 and TPS2056 limit the output current to a safe level by switching into a constant-current mode, pulling the overcurrent (OCx) 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 TPS2046 and TPS2056 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 TYPICAL PACKAGED DEVICES MAXIMUM CONTINUOUS SHORT CIRCUIT CURRENT

TA ENABLE

LOAD CURRENT LIMIT AT 25°C SOIC PDIP (A) (A) (D)† (P)

–40°C to 85°C Active low 0.25 0.44 TPS2046D TPS2046P –40°C to 85°C Active high 0.25 0.44 TPS2056D TPS2056P The D package is available taped and reeled. Add an R suffix to device type (e.g., TPS2046DR)

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 PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

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