MCP18480T-I/SS【PDF 34/64 页】IC HOT SWAP CTRLR -48V 20SSOP

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MCP18480

DS20091B-page 34

?2003 Microchip Technology Inc.

REFOUT

Reference output.

Internal reference output voltage (typically 2.5V). Usually tied back to

the V

REFIN

pin unless an external high-precision reference voltage is

desired.

REFIN

Reference input.

This pin allows a high-precision reference voltage for the following

functions:

" Undervoltage Comparator

" Overvoltage Comparator

" DRAIN Comparator

" Current Limit Timer

If the precision of the V

REFOUT

output voltage is acceptable, tie the

REFOUT

pin to the V

REFIN

pin.

Current Limit.

Input used to set the maximum current limit threshold allowed by the

system via a resistor divider network (with the resistor R

CL1

between

the V

REFIN

pin and the CL pin and resistor R

between the V

NEG

and the CL pin). If the voltage across the sense resistor exceeds the

voltage on the CL pin, it implies that there is excessive current over the

allowed limit and forces the GATE pin to the V

NEG

pin voltage level

without delay.

SET

Current source set.

Establishes the internal I

SOURCE

for the following:

" Undervoltage Delay

" Current Limit Timer

" GATE Pin Source Current

An external resistor R

ISET

from the I

SET

pin must be connected to

either the V

NEG

pin or the V

REFIN

pin to set I

BIAS

, which will then estab-

lish the current sources throughout the device. The I

BIAS

current is the

same for either connection.

Connecting the R

ISET

resistor to the V

NEG

pin will establish the

PWRGOOD pin output polarity to be active-high. Connecting the R

ISET

resistor to the V

REFIN

pin will establish the PWRGOOD pin output

polarity to be active-low.

TABLE 3-1:

MCP18480 PIN DESCRIPTIONS (CONTINUED)

Pin Name

Number

Direction

Buffer

Type

Description

SSOP

Legend: TTL = TTL compatible input

ST = Schmitt Trigger input with CMOS levels

I = Input

O = Output

P = Power

CMOS = CMOS-compatible input

A = Analog

D = Digital

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