ISL6219A_07 Datasheet(数据表) 4 Page

4 page

FN9093.1

March 20, 2007

Functional Pin Descriptions

VID0, VID1, VID2, VID3, VID4 (Pins 1, 2, 3, 4, 5)

These are the inputs to the internal DAC that provide the

reference voltage for output regulation. Each pin has an

internal 20

μA pull-up current source to 2.5V making the parts

compatible with CMOS and TTL logic from 5V down to 2.5V.

When a VID change is detected the reference voltage slowly

ramps up or down to the new value in 25mV steps. Connect

these pins to either open-drain or active-pull-up type outputs.

Pulling these pins above 2.9V can cause a reference offset

inaccuracy.

FS/EN (Pin 7)

This is a dual function pin. A resistor placed from FS/EN to

ground sets the switching frequency. There is an inverse

relationship between the value of the resistor and the

switching frequency. This pin can also be used to disable the

controller. To disable the controller, pull this pin below 1V.

FB (Pin 8) and COMP (Pin 9)

The internal error amplifier’s inverting input and output

respectively. These pins are connected to an external R-C

network to compensate the regulator.

GND (Pin 14)

Bias and signal ground for the IC.

VSEN (Pin 15)

Power good monitor input. Connect to the microprocessor

CORE voltage.

PWM3, PWM2, PWM1 (Pins 18, 21, 22)

Pulse-width modulation outputs. These logic outputs tell the

driver IC(s) when to turn the MOSFETs on and off.

ISEN3, ISEN2, ISEN1 (PINS 19, 20, 23)

Current sense inputs. A resistor connected between these

pins and the respective phase nodes has a current

proportional to the current in the lower MOSFET during its

conduction interval. The current is used as a reference for

channel balancing, load sharing, protection, and load-line

regulation.

PGOOD (Pin 25)

Power good. This pin is an open-drain logic signal that

indicates when the microprocessor CORE voltage (VSEN

pin) is within specified limits and soft-start has timed out.

VCC (Pin 28)

Bias supply voltage for the controller. Connect this pin to a

5V power supply.

ISL6219A

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