TPS2046_14 Datasheet, PDF (1/25 Pages) Texas Instruments – DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

TPS2046, TPS2056
DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
features
D 135-mΩ -Maximum (5-V Input) High-Side
MOSFET Switch
D 250 mA Continuous Current per Channel
D Independent 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
SLVS183 – 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
TPS2046
D OR P PACKAGE
(TOP VIEW)
GND 1
IN 2
EN1 3
EN2 4
8 OC1
7 OUT1
6 OUT2
5 OC2
TPS2056
D OR P PACKAGE
(TOP VIEW)
GND 1
IN 2
EN1 3
EN2 4
8 OC1
7 OUT1
6 OUT2
5 OC2
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
–40°C to 85°C Active high
0.25
0.44
TPS2056D
† _{The D package is available taped and reeled. Add an R suffix to device type (e.g., TPS2046DR)}
TPS2046P
TPS2056P
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.
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.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright © 1999, Texas Instruments Incorporated
1