ST2054 Datasheet, PDF (1/9 Pages) STMicroelectronics – CURRENT LIMITED POWER DISTRIBUTION SWITCHES

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