LTC4260IGN datasheet(8/28 Pages) LINER

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LTC4260

4260f

GPIO: General Purpose Input/Output. Open-drain logic

output and logic input. Defaults to pull low to indicate

power is bad. Configure according to Table 3.

NC: No Connect. Unconnected pins. These pins provide

extra distance between high and low voltage pins.

ON: On Control Input. A rising edge turns on the external

N-channel FET and a falling edge turns it off. This pin is

also used to configure the state of the FET ON bit (and

hence the external FET) at power up. For example if the ON

pin is tied high, then the FET ON control bit (A3) will go high

100ms after power-up. Likewise if the ON pin is tied low

then the part will remain off after power-up until the FET

ON control bit is set high using the I2C bus. A high-to-low

transition on this pin will clear faults.

OV (GN/UH Packages): Overvoltage Comparator Input.

Connect this pin to an external resistive divider from VDD.

If the voltage at this pin rises above 3.5V, an overvoltage

fault is detected and the switch 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.

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

for shifting in address, command or data bits. Normally

tied to SDAO to form the SDA line.

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

SENSE: Current Sense Input. Connect this pin to the

output of the current sense resistor. The current limit

circuit controls the GATE pin to limit the sense voltage

between the VDD and SENSE pins to 50mV or less depend-

ing on the voltage at the FB pin. This pin is used as an input

to the 8-bit ADC.

SOURCE: N-Channel MOSFET Source Connection and

ADC Input. Connect this pin to the source of the external

N-channel MOSFET switch. This pin also serves as the

ADC input to monitor output voltage. The pin provides a

return for the gate pull-down circuit and as a supply for the

charge pump circuit.

TIMER: Timer Input. Connect a capacitor between this

pin and ground to set a 12ms/µF duration for current limit

before the switch is turned off. The duration of the off

time is 518ms/µF when autoretry during current limit is

enabled. A minimum value of 0.1nF must be connected

to this pin.

UV: Undervoltage Comparator Input. Connect this pin to

an external resistive divider from VDD. If the voltage at this

pin falls below 3.12V, an undervoltage fault is detected and

the switch turns off. Pulling this pin below 1.2V resets all

faults and allows the switch to turn back on. Tie to INTVCC

if unused.

VDD: Supply Voltage and Current Sense Input. This pin has

an undervoltage lockout threshold of 7.45V.

INTVCC: Internal Low Voltage Supply Decoupling Output.

Connect a 0.1µF capacitor from this pin to ground. This pin

can be used to drive the other pins to logic high and has an

undervoltage lockout threshold of 3.8V.

VDDK (UH Package): Same as VDD. Connect this pin to

VDD. VDDK tied to VDD internally with 18Ω.

PI FU CTIO S

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