MCP18480 datasheet(34/64 Pages) MICROCHIP

34 / 64 page

MCP18480

DS20091B-page 34

 2003 Microchip Technology Inc.

VREFOUT

Reference output.

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

the VREFIN pin unless an external high-precision reference voltage is

desired.

VREFIN

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 VREFOUT output voltage is acceptable, tie the

VREFOUT pin to the VREFIN pin.

Current Limit.

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

system via a resistor divider network (with the resistor RCL1 between

the VREFIN pin and the CL pin and resistor RCL between the VNEG pin

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 VNEG pin voltage level

without delay.

ISET

Current source set.

Establishes the internal ISOURCE for the following:

• Undervoltage Delay

• Current Limit Timer

• GATE Pin Source Current

An external resistor RISET from the ISET pin must be connected to

either the VNEG pin or the VREFIN pin to set IBIAS, which will then estab-

lish the current sources throughout the device. The IBIAS current is the

same for either connection.

Connecting the RISET resistor to the VNEG pin will establish the

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

resistor to the VREFIN 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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