LTC4216IDE datasheet(6/24 Pages) LINER

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LTC4216

4216f

⎯R⎯E⎯S⎯E⎯T (Pin 1/Pin 1): Reset or Power-Good Output. Open

drain output that pulls low if the FB pin voltage falls below

its threshold (0.6V). If an undervoltage lockout condition

occurs, the ⎯R⎯E⎯S⎯E⎯T pin pulls low and ignores the FB pin

voltage.

ON (Pin 2/Pin 2): ON Control Input. A rising edge above

the ON pin threshold (0.8V) initiates the start-up cycle and

turns on the external N-channel MOSFET. A falling edge

below 0.72V (80mV ON pin hysteresis) turns it off. If this

pin is pulled below 0.4V, following a circuit breaker trip, it

resets the electronic circuit breaker and fault latch.

FILTER (Pin 3/Pin 3): Fault Filter Input. Connect a capacitor

between this pin and ground to set up the fault ﬁlter delay.

This pin sources 60µA or sinks 2.4µA when the voltage

across the sense resistor exceeds 25mV or drops below

25mV respectively.

TIMER (Pin 4/Pin 4): Timer Input. Connect a capacitor

between this pin and ground to set up the start-up timing

cycle duration. It also deﬁnes the ⎯R⎯E⎯S⎯E⎯T power-good delay

from the instant the FB pin voltage exceeds 0.6V. This pin

sources 2µA pull-up current during ramp up.

SS (Pin 5/Not Available): Soft-Start Control Input. Con-

nect a capacitor between this pin and ground for soft-start

during power-up. It controls the GATE ramp up, limiting

the rate of change of the inrush current when the external

MOSFET turns on. If soft-start function is not used, leave

this pin unconnected.

GND (Pin 6/Pin 5): Device Ground.

FB (Pin 7/Pin 6): Output Monitor for Reset Output. A resis-

tive divider from the external MOSFET’s source terminal is

tied to this pin. When the voltage at this pin drops below

0.6V, the ⎯R⎯E⎯S⎯E⎯T pin pulls low.

GATE (Pin 8/Pin 7): Gate Drive for External N-Channel

MOSFET. An internal charge pump provides 20µA gate

pull-up current and sufﬁcient gate overdrive to the exter-

nal MOSFET. An internal shunt regulator limits the GATE

pin voltage to about 6.2V (typ) above the SENSEN pin

voltage.

SENSEN (Pin 9/Pin 8): Circuit Breaker Negative Sense

Input. Connect this pin to the sense resistor terminal wired

to the drain of the external N-channel MOSFET. The sense

resistor is placed in the power path between SENSEP and

SENSEN pins to sense the output current. The electronic

circuit breaker trips if the voltage across the sense resistor

exceeds 25mV for more than a fault ﬁlter delay.

SENSEP (Pin 10/Pin 9): Circuit Breaker Positive Sense

Input. Connect this pin to the sense resistor terminal wired

to the positive supply input for the external output load.

This positive supply range extends from 0V to 6V.

VCC (Pin 11/Pin 10): Bias Supply Input. Operates from

2.3V to 6V. An internal undervoltage lockout circuit disables

the device until the input supply voltage at VCC exceeds

2.12V typically.

⎯F⎯A⎯U⎯L⎯T (Pin 12/Not Available): Fault Input and Output. As

an input, driving this pin low (<1.253V) will latch-off the

device to fault mode. As an output, it is either pulled high

by an internal 5µA pull-up or an external pull-up resistor

to positive supply under normal operating condition. It

pulls low when the circuit breaker is tripped due to an

overcurrent fault.

Exposed Pad (Pin 13/Not Available): Exposed pad may

be left open or connected to device ground.

(DE12 Package/MS Package)

PI FU CTIO S

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