LTC4260CSW datasheet(7/28 Pages) LINER

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LTC4260

4260f

PI FU CTIO S

ADIN: ADC Input. A voltage between 0V and 2.56V applied

to this pin can be measured by the onboard ADC. Tie to

ground if unused.

ADR0 to ADR2: Serial Bus Address Inputs. Tying these

pins to ground, open or INTVCC configures one of 27 pos-

sible addresses. See Table 1 in Applications Information.

ALERT: Fault Alert Output. Open-drain logic output that

can be pulled to ground when a fault occurs to alert the

host controller. A fault alert is enabled by the ALERT

protocol. See Applications Information. Tie to ground if

unused.

BD_PRST: Board Present Input. Ground this pin to enable

the N-channel FET to turn on after 100ms debounce delay.

When this pin is high, the FET is off. An internal 10µA

current source pulls up this pin. Transitions on this pin will

be recorded in the FAULT register. A high-to-low transition

activates the logic to read the state of the ON pin and clear

Faults. See Applications Information.

Exposed Pad (Pin 33, UH Package): Exposed Pad may be

left open or connected to device ground.

FB: Foldback and Power Good Input. A resistive divider

from the output voltage is tied to this pin. When the voltage

at this pin drops below 3.41V, the output power is consid-

ered bad and the current limit is reduced. The power bad

condition can be indicated with the GPIO pin and a power

bad fault can be logged in this condition. See Applications

Information.

GATE: Gate Drive for External N-Channel FET. An internal

18µA current source charges the gate of the external

N-channel MOSFET. A resistor and capacitor network

from this pin to ground sets the turn-on rate and compen-

sates the active current limit. During turn-off there is a

1mA pull-down current. During a short circuit or under-

voltage lockout (VDD or INTVCC), a 600mA pull-down

current source between GATE and SOURCE is activated.

GND: Device Ground.

TYPICAL PERFOR A CE CHARACTERISTICS T

A = 25°C, VDD = 48V unless otherwise noted.

ADC INL vs Code (ADIN Pin)

CODE

0.25

256

4260 G16

–0.25

–0.50

128

192

0.50

ADC DNL vs Code (ADIN Pin)

CODE

0.25

256

4260 G17

–0.25

–0.50

128

192

0.50

ADC Full-Scale Error

vs Temperature (ADIN Pin)

TEMPERATURE (°C)

–50

–2

–1

–25

3708 G15

100

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