DS4560LS-AR+ Maxim Integrated Products, DS4560LS-AR+ Datasheet - Page 5

• Manufacturer Part Number: DS4560LS-AR+
• Description: Hot Swap & Power Distribution
• Manufacturer: Maxim Integrated Products

Specifications of DS4560LS-AR+

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The DS4560 begins to operate when V
undervoltage lockout level, V
enable circuit and TIMER pin become active. Once the
device has been enabled, a gate voltage is applied to
the power MOSFET, allowing current to begin flowing
from V
ramp is controlled by the capacitance placed at the
VRAMP pin. The load current is continuously monitored
during the initial voltage ramping (I
mal operation (I
limit that is set by the external resistance at ILIM, the
gate voltage of the power MOSFET is decreased,
reducing the output current to the set current limit.
CC
EXTERNAL DISABLE
to LOAD. The speed of the output-voltage
THERMAL
LIMIT
UVLO
OVL
_______________________________________________________________________________________
). If the current exceeds the current
DS4560
CHARGE
PUMP
Detailed Description
80μA
VREG
+5V
UVLOR
+5V
SCL
TIMER
2.5V
C
. At this level, the
TIMER
) and during nor-
CC
exceeds the
Block Diagram/Typical Application Circuit
CURRENT
LIMIT
VRAMP
V
CC
Current is limited by the DS4560 comparing the voltage
difference between the LOAD and ILIM pins to an inter-
nal reference voltage. If the output current exceeds the
limit that is set by the R
the power MOSFET is decreased, which reduces the
output current to the load.
When the output power is initially ramping up, the current
limit is I
current limit is I
the source if there is a dead short on initial power-up.
The DS4560 acts as a fuse and automatically disables
the current flowing to the load when the temperature of
the power MOSFET has exceeded the shutdown junc-
tion temperature, T
C
VRAMP
80μA
OVERVOLTAGE
12V Hot-Plug Switch
LIMIT
SCL
. Once the voltage ramping is complete, the
+12V
OVL
V
GND
CC
R
R
. The lower I
SHDN
LOAD
ILIM
ILIM
.
resistor, the gate voltage of
R
ILIM
SCL
current limit protects
LOAD
5