ST2054(2005) Ver la hoja de datos (PDF) - STMicroelectronics

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ST2054
(Rev.:2005)

CURRENT LIMITED POWER DISTRIBUTION SWITCHES

STMicroelectronics 

ST2054

CURRENT LIMITED

POWER DISTRIBUTION SWITCHES

I 80mΩ HIGH-SIDE MOSFET SWITCH

I 500mA CONTINUOUS CURRENT PER

CHANNEL

I INDEPENDENT THERMAL AND

SHORT-CIRCUIT PROTECTION WITH

OVERCURRENT LOGIC OUTPUT

I OPERATING RANGE FROM 2.7V TO 5.5V

I CMOS- AND TTL-COMPATIBLE ENABLE

INPUTS

I 10 ms OC_N FAULT BLANKING

I 2.5ms TYPICAL RISE TIME

I UNDERVOLTAGE LOCKOUT

I 20µA MAXIMUM STANDBY SUPPLY

CURRENT

I AMBIENT TEMPERATURE RANGE, 0°C TO

85°C

I ESD PROTECTION

DESCRIPTION

The ST2054 power distribution switches is

intended for application where heavy capacitive

loads and short circuits are likely to be

encountered. These devices incorporate 80mΩ

N-channel MOSFET high-side power switches for

power-distribution systems that require multiple

powers switches in a single package. Each switch

is controlled by an independent logic enable input.

Gate drive is provided by an internal charge pump

designed to control the power-switch rise times

and fall times to minimize current surges during

switching. The charge pump requires no external

Table 1: Order Codes

SOP

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, these devices limit

the output current to a safe level by switching into

a constant-current mode, pulling the overcurrent

(OCx) logic output low. A 10ms deglitching circuit

provides fault-blanking feature, preventing the

OC_N pin to be asserted during hot-insertion or

short spikes of overcurrent conditions.

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 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.

These power-distribution switches are designed to

current limit at 0.9 A.

Type

ST2054BD

ST2054BDR

Temperature

Range

-40 to 85 °C

-40 to 85 °C

Package

SO-16 (Tube)

SO-16 (Tape & Reel)

Comments

50parts per tube / 40tube per box

2500 parts per reel

July 2005

Rev. 3

1/9

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