TPS2046, TPS2056
DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
SLVS183 – APRIL 1999
features
typical applications
135-mΩ -Maximum (5-V Input) High-Side
MOSFET Switch
Notebook, Desktop and Palmtop PCs
Monitors, Keyboards, Scanners, and
Printers
250 mA Continuous Current per Channel
Independent Short-Circuit and Thermal
Protection With Overcurrent Logic Output
Digital Cameras, Phones, and PBXs
Hot-Insertion Applications
Operating Range . . . 2.7-V to 5.5-V
Logic-Level Enable Input
2.5-ms Typical Rise Time
TPS2046
D OR P PACKAGE
(TOP VIEW)
TPS2056
D OR P PACKAGE
(TOP VIEW)
Undervoltage Lockout
10 µA Maximum Standby Supply Current
Bidirectional Switch
GND
IN
OC1
GND
IN
OC1
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
OUT1
OUT2
OC2
OUT1
OUT2
OC2
Available in 8-pin SOIC and PDIP Packages
Ambient Temperature Range, –40°C to 85°C
EN1
EN2
EN1
EN2
2-kV 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
causingthejunctiontemperaturetorise, athermalprotectioncircuitshutsofftheswitchinovercurrenttoprevent
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
MAXIMUM CONTINUOUS
LOAD CURRENT
(A)
TYPICAL
SHORT-CIRCUIT CURRENT
LIMIT AT 25°C
PACKAGED DEVICES
T
A
ENABLE
SOIC
PDIP
(P)
†
(D)
(A)
–40°C to 85°C Active low
–40°C to 85°C Active high
0.25
0.25
0.44
0.44
TPS2046D TPS2046P
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.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265