DS4560

THERMAL

LIMIT

EXTERNAL DISABLE

TIMER

+5V

2.5V

UVLO

CURRENT

LIMIT

CHARGE

PUMP

LOAD

+5V

VREG

OVERVOLTAGE

LIMIT

GND

R

R

LOAD

ILIM

+12V

VRAMP

80

μA

80

μA

Block Diagram/Typical Application Circuit

12V Hot-Plug Switch

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5

Detailed Description

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

ramp is controlled by the capacitance placed at the

VRAMP pin. The load current is continuously monitored

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.

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

the power MOSFET is decreased, which reduces the

output current to the load.

When the output power is initially ramping up, the current

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-