LT4239 datasheet(7/24 Pages) AD

7 / 24 page

LT4239

Rev. 0

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FLT (Pin 12): Open Drain Fault Output. Output that pulls

low when a fault occurs. It can be a start-up fault, or a

fault timer expired due to a FET-Bad or an overcurrent

fault. Otherwise, it goes high impedance and requires

an external pull-up resistor to a positive supply. Leave

unconnected if unused.

PG (Pin 13): Open Drain Power Good Status Output. The

pin is kept low until a power good condition is valid for

10ms. To initiate the 10ms power good timer, ∆VGATE2

needs to be above 10V and the voltage difference across

the Bypass MOSFET is less than 100mV. Connect a

resistor from this pin to a positive supply voltage. Leave

unconnected if unused.

GND (Pin 14): Device Ground.

PIN FUNCTIONS

IBOOST (Pin 15): Extra Loading Request Input. Pulls this

pin high to double both the circuit breaker and active cur-

rent limit thresholds. This allows the Bypass MOSFET to

supply higher current without triggering either the circuit

breaker or the current limit timers. Connect to GND to

disable this function.

IMON (Pin 16): Current Sense Monitor Output. This

voltage at the pin is proportional to the sense voltage

monitored between the SENSE2 and OUTK pins with a

voltage gain of 100. An internal 20k resistor is connected

from this pin to ground. The measurement is valid only

when OUT is above 3.7V and PG is pulled high, other-

wise the pin is pulled low to ground. Leave unconnected

if unused.

Exposed Pad (Pin 17): May be left open or connected to

device ground.

LT4239 Datasheet(PDF) 7 Page - Analog Devices