EUP3546
Dual Power-Distribution Switch
with Fault-Blanking
DESCRIPTION
The EUP3546 incorporates dual 95m
P-channel
MOSFET power switches for power-distribution
systems that require multiple power switches in a single
package. Each switch is controlled by a logic enable
input.
When either output load exceeds the current-limit
threshold or a short is present, the device limits the
outputs current to a safe level by switching into a
constant-current limit mode with fold back, pulling the
over-current (OCB(s)) logic output low. When
continuous heavy overloads or short-circuits increase
the power dissipation in the switches, causing the
junction temperature to raise, a thermal protection
circuit shutdown the switches to prevent damage.
Internal Under Voltage Lock-Out (UVLO) circuitry
ensures that the switches remain off until valid input
voltage is present. Each power switch is designed to set
current limit at 1A typically.
OCB(s) are open-drain outputs which are asserted when
over-current occurs. A 8ms fault-blanking feature
enables the circuit to ignore momentary faults, such as
those caused when hot-swapping a capacitive load,
preventing false alarms to the host system. The
EUP3546 eliminates any reversed current flow across
each switch when it is powered off.
The EUP3546 is available in 8-pin SOP package,
operates over the extended (-40
℃
to +85
℃
) temperature
range.
FEATURES
Dual 95m High-Side MOSFET
1A Current Limits with Fold-back
Operating Range:2.7V to 5.5V
300µS Typical Rise Time
Under voltage Lockout
15µA Quiescent Supply Current
1µA Shutdown Supply Current
Logic Level Enable Pin, Available with
Active-Low Version
No Reverse Current when Power Off
Open-Drain Over-Current Flag Outputs with
fault-blanking
Available in SOP-8 Package
RoHS Compliant and 100% Lead(Pb)-Free
Halogen-Free
APPLICATIONS
High-Side Power Protection Switch
USB Power Management
USB Host and Self-Powered Bubs
USB Bus-Powered Hubs
Hot Plug-In Power Supplies
Battery-Charger Circuits
Short-Circuit Protections
Typical Application Circuit
Figure 1.
DS3546
Ver1.0
Oct. 2009
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
