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July 2005

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2.7V TO 5.5V INPUT RANGE

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PROGRAMMABLE CURRENT LIMIT UP TO

1.2A

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LOW QUIESCENT CURRENT

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THERMAL SHUTDOWN

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FAULT INDICATOR OUTPUT

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90m

Ω (TYP.) ON RESISTANCE

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SO-8 PACKAGE

DESCRIPTION

The ST890 is a low voltage, P-Channel MOSFET

power switch intended for high side load switching

applications.

This switch operates with inputs from 2.7V to

5.5V, making it ideal for both 3V and 5V systems.

Internal current limiting circuitry protects the input

supply

against

overload.

Thermal

overload

protection limits power dissipation and junction

temperatures.

The ST890’s maximum current limits is 1.2A. The

current limit through the switch is programed with

a resistor from SET to ground. The ST890 is

available in SO-8 package. Main applications are:

PCMCIA

slots,

Access

bus

slots,

Portable

equipment.

Table 1: Order Codes

Type

Temperature

Range

Package

Comments

ST890CD

0 to 70 °C

SO-8 (Tube)

50parts per tube / 40tube per box

ST890CDR

0 to 70 °C

SO-8 (Tape & Reel)

2500 parts per reel

ST890BD

-40 to 85 °C

SO-8 (Tube)

50parts per tube / 40tube per box

ST890BDR

-40 to 85 °C

SO-8 (Tape & Reel)

2500 parts per reel

ST890

1.2A CURRENT LIMITED HIGH SIDE WITH

THERMAL SHUTDOWN

Figure 1: Schematic Diagram

SO-8

Rev. 4