LTC4215CUFD-3TRPBF datasheet(9/28 Pages) LINER

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LTC4215-1/LTC4215-3

421513fc

OV: Overvoltage Comparator Input. Connect this pin to an

external resistive divider from VDD. If the voltage at this

pin rises above 1.235V, an overvoltage fault is detected

and the GATE turns off. Tie to GND if unused.

SCL: Serial Bus Clock Input. Data at the SDA pin is shifted

in or out on rising edges of SCL. This is a high impedance

pin that is generally driven by an open-collector output

from a master controller. An external pull-up resistor or

current source is required.

SDAO: Serial Bus Data Output. Open-drain output for

sending data back to the master controller or acknowledg-

ing a write operation. Normally tied to SDAI to form the

SDA line. An external pull-up resistor or current source

is required.

SDAI: Serial Bus Data Input. A high impedance input for

shifting in address, command or data bits. Normally tied

to SDAO to form the SDA line.

SENSE+:

Positive Current Sense Input. Connect this pin to

the input of the current sense resistor. Must be connected

to the same trace as VDD.

SENSE–:

Negative Current Sense Input. Connect this

pin to the output of the current sense resistor. This pin

provides sense voltage feedback and monitoring for the

current limit, circuit breaker and ADC.

SOURCE: N-channel MOSFET Source and ADC Input.

Connect this pin to the source of the external N-channel

MOSFET switch for gate drive return. This pin also serves

as the ADC input to monitor output voltage. The pin pro-

vides a return for the gate pull-down circuit.

SS: Soft Start Input. Sets the inrush current slew rate at

start-up. Connect a 68nF capacitor to provide 5mV/ms as

the slew rate for the sense voltage in start-up. This cor-

responds to 1A/ms with a 5mΩ sense resistor. Note that

a large soft-start capacitor and a small TIMER capacitor

may result in a condition where the timer expires before

the inrush current has started. Allow an additional 10nF

of timer capacitance per 1nF of soft-start capacitor to

ensure proper start-up. Use 1nF minimum to ensure an

accurate inrush current.

TIMER: Start-Up Timer Input. Connect a capacitor be-

tween this pin and ground to set a 12.3ms/μF duration

for start-up, after which an overcurrent fault is logged if

the inrush is still current limited. The duration of the off

time is 600ms/μF when overcurrent auto retry is enabled,

resulting in a 1:50 duty cycle. An internal timer provides

a 100ms start-up time and 5 seconds auto-retry time if

this pin is tied to INTVCC. Allow an additional 10nF of

timer capacitance per 1nF of soft-start (SS) capacitor to

ensure proper start-up. The minimum value for the TIMER

capacitor is 10nF.

UV: Undervoltage Comparator Input. Connect this pin

to an external resistive divider from VDD. If the voltage

at this pin falls below 1.155V, an undervoltage fault is

detected and the GATE turns off. Pulling this pin below

0.4V resets all faults and allows the GATE to turn back

on. Tie to INTVCC if unused.

VDD: Supply Voltage Input. This pin has an undervoltage

lockout threshold of 2.84V and overvoltage lockout

threshold of 15.6V

PIN FUNCTIONS

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