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MAX34565
12V Hot-Plug Switch in TDFN Package
Detailed Description
The MAX34565 is a self-contained hot-plug switch
intended to be used on +12V power buses to limit
through current and to control the power-up output-
voltage ramp. The device begins to operate when V CC
exceeds the undervoltage lockout level, V UR . At this
level, the enable circuit and EN/FAULT pin become
active. Once the device has been enabled by exceed-
ing V OLT on the EN/FAULT pin, a gate voltage is applied
to the power MOSFET, allowing current to begin flowing
from the V CC pad to LOAD.
The device contains an on-board 68m I n-channel power
the device’s output is disabled. If the internal tem-
perature of the device exceeds T SHDN , a thermal fault
occurs and the device drives EN/FAULT to V FAULT .
See Figure 1 for the EN/FAULT signal levels.
An open-drain device should be connected to the EN/
FAULT pin for proper operation. Because the device
pulls EN/FAULT to V FAULT (a three-state condition) in the
event of thermal shutdown, this pin should not be con-
nected to an external pullup device. See Figure 2 for a
typical application circuit.
MOSFET that is actively closed-loop controlled to ensure
that an adjustable current limit is not exceeded. The
maximum allowable current through the device is deter-
mined by an external resistor connected to the ILIM pin.
V OHT
LOAD
ENABLED
THERMAL
SHUTDOWN/
FAULT
The device also contains the ability to control the power-
up output-voltage ramp. A capacitor connected to the
V FAULT
VRAMP pin sets the desired voltage ramp rate. The
output voltage is unconditionally clamped to keep input
overvoltage stresses from harming the load. The device
has an on-board temperature sensor with hysteresis.
If operating conditions cause the device to exceed an
internal thermal limit, the device unconditionally shuts
V OLT
LOAD
DISABLED
down and latches off while waiting for a power-on reset.
In the event of thermal shutdown, the device drives the
EN/FAULT pin to an intermediate voltage, V FAULT .
Figure 1. EN/FAULT Signal Levels
Undervoltage Lockout
When voltage is applied to V CC , the undervoltage lockout
rising limit, V UR , must be exceeded before the MOSFET
circuit is enabled. When the voltage on V CC drops below
V UF , the current through the MOSFET is blocked. Note
that to allow current to pass through to the LOAD pins,
12V
V CC
MAX34565
LOAD
V CC must exceed V UR and the voltage on EN/FAULT
must exceed V OHT .
Enable/Fault Function (EN/FAULT)
The EN/FAULT pin can be used to control the output
EN/FAULT
GND
ILIM
VRAMP
R ILIM
of the device and to indicate that a thermal fault has
occurred. The voltage level of the EN/FAULT pin is
compared to two internal sources: voltage on limit
(V OHT ) and voltage off limit (V OLT ). When V CC is above
V UR and the voltage level on EN/FAULT exceeds V OHT ,
the voltage ramp circuit turns on, enabling the device’s
output. When the voltage on EN/FAULT is below V OLT ,
ENABLE
Figure 2. Typical Application Circuit
6
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