TPS2045, TPS2055

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 – APRIL 1999

1

POST OFFICE BOX 655303

features

MOSFET Switch

Overcurrent Logic Output

Machine-Model ESD Protection

typical applications

Printers

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-m

Ω 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

RECOMMENDED

MAXIMUM CONTINUOUS

TYPICAL SHORT-CIRCUIT

PACKAGED DEVICES

TA

ENABLE

MAXIMUM CONTINUOUS

LOAD CURRENT

(A)

CURRENT LIMIT AT 25

°C

(A)

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)

Copyright

© 1999, Texas Instruments Incorporated

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.

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

IN

EN

OUT

OUT

OUT

OC

TPS2045

D OR P PACKAGE

(TOP VIEW)

1

2

3

4

8

7

6

5

GND

IN

IN

EN

OUT

OUT

OUT

OC

TPS2055

D OR P PACKAGE

(TOP VIEW)