TPS2046, TPS2056

DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS183 – APRIL 1999

1

POST OFFICE BOX 655303

features

MOSFET Switch

Protection With Overcurrent Logic Output

Machine-Model ESD Protection

typical applications

Printers

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-m

Ω

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

MAXIMUM CONTINUOUS

TYPICAL

SHORT CIRCUIT CURRENT

PACKAGED DEVICES

TA

ENABLE

MAXIMUM CONTINUOUS

LOAD CURRENT

(A)

SHORT-CIRCUIT CURRENT

LIMIT AT 25

°C

(A)

SOIC

(D)†

PDIP

(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)

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.

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.

1

2

3

4

8

7

6

5

GND

IN

EN1

EN2

OC1

OUT1

OUT2

OC2

TPS2046

D OR P PACKAGE

(TOP VIEW)

1

2

3

4

8

7

6

5

GND

IN

EN1

EN2

OC1

OUT1

OUT2

OC2

TPS2056

D OR P PACKAGE

(TOP VIEW)