TPS2045 Datasheet, PDF (1/23 Pages) Texas Instruments – CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

TPS2045, TPS2055
CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
features
D 135-mΩ -Maximum (5-V Input) High-Side
MOSFET Switch
D 250 mA Continuous Current
D Short-Circuit and Thermal Protection With
Overcurrent Logic Output
D Operating Range . . . 2.7-V to 5.5-V
D Logic-Level Enable Input
D 2.5-ms Typical Rise Time
D Undervoltage Lockout
D 10 µA Maximum Standby Supply Current
D Bidirectional Switch
D Available in 8-pin SOIC and PDIP Packages
D Ambient Temperature Range, –40°C to 85°C
D 2-kV Human-Body-Model, 200-V
Machine-Model ESD Protection
SLVS182 – APRIL 1999
typical applications
D Notebook, Desktop and Palmtop PCs
D Monitors, Keyboards, Scanners, and
Printers
D Digital Cameras, Phones, and PBXs
D Hot-Insertion Applications
TPS2045
D OR P PACKAGE
(TOP VIEW)
GND 1
IN 2
IN 3
EN 4
8 OUT
7 OUT
6 OUT
5 OC
TPS2055
D OR P PACKAGE
(TOP VIEW)
GND 1
IN 2
IN 3
EN 4
8 OUT
7 OUT
6 OUT
5 OC
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
TA
ENABLE
RECOMMENDED
MAXIMUM CONTINUOUS
LOAD CURRENT
(A)
TYPICAL SHORT-CIRCUIT
CURRENT LIMIT AT 25°C
(A)
PACKAGED DEVICES
SOIC
(D)†
PDIP
(P)
–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.
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.
Copyright © 1999, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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