ST2042 Datasheet, PDF (1/8 Pages) STMicroelectronics – CURRENT LIMITED POWER DISTRIBUTION SWITCHES

ST2042
CURRENT LIMITED
POWER DISTRIBUTION SWITCHES
s 80mΩ HIGH-SIDE MOSFET SWITCH
s 500mA CONTINUOUS CURRENT PER
CHANNEL
s INDEPENDENT THERMAL AND
SHORT-CIRCUIT PROTECTION WITH
OVERCURRENT LOGIC OUTPUT
s OPERATING RANGE FROM 2.7V TO 5.5V
s CMOS- AND TTL-COMPATIBLE ENABLE
INPUTS
s 2.5ms TYPICAL RISE TIME
s UNDERVOLTAGE LOCKOUT
s 10µA MAXIMUM STANDBY SUPPLY
CURRENT
s AMBIENT TEMPERATURE RANGE, 0°C TO
85°C
s ESD PROTECTION
DESCRIPTION
The ST2042 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
SOP
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, these devices 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 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
ORDERING CODES
Type
ST2042BD
ST2042BDR
Temperature
Range
-40 to 85 °C
-40 to 85 °C
Package
SO-8 (Tube)
SO-8 (Tape & Reel)
Comments
50parts per tube / 40tube per box
2500 parts per reel
October 2003
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