ST2042_07 Datasheet, PDF (1/12 Pages) STMicroelectronics – Enhanced power switch

ST2042
Enhanced power switch
Features
■ 80mΩ high-side MOSFET switch
■ 500mA continuos current per channel
■ Thermal and short-circuit protection with
overcurrent logic output
■ Operating range from 2.7V to 5.5V
■ CMOS- and TTL-compatible enable inputs
■ 10ms OC_N fault blanking
■ 2.5ms typical rise time
■ Under voltage lock out
■ 10µA maximum standby supply current
■ Ambient temperature range, -40°C to 85°C
■ Fault-blanking
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 80m.
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.
SO-8
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. 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.
Table 1. Device summary
Part number
ST2042BD
ST2042BDR
Package
SO-8
SO-8
Packaging
Tube
(50 parts per tube, 40 tube per box)
Tape and reel (2500 parts per reel)
May 2007
Rev 5
1/12
www.st.com
12