LTC4280CUFD datasheet(9/28 Pages) LINER

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LTC4280

4280f

PIN FUNCTIONS

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

sendingdatabacktothemastercontrolleroracknowledging

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 provides

a return for the gate pulldown circuit.

TIMER: Start-Up Timer Input. Connect a capacitor

between 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.

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.

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