IR3080PBF datasheet(6/41 Pages) IRF

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IR3080

PbF

PIN DESCRIPTION

PIN#

PIN SYMBOL

PIN DESCRIPTION

VIDFB

Feedback to the VCCVID regulator. Connect to the VCCVID output.

VCCVID

1.2V/150mA Regulator Output. Can also drive external pass transistor to minimize

on-chip power dissipation

VIDPWR

Power for VID Pull-up resistors and VCCVID Regulator

4-9

VID0-5

Inputs to VID D to A Converter. On-chip 700 ohm pull-up resistors to VIDPWR pin

are included.

10,

11,

13,14

TRM1-4

Used for precision post-package trimming of the VDAC voltage. Do not make any

connection to these pins.

VOSNS-

Remote Sense Input. Connect to ground at the Load.

ROSC

Connect a resistor to VOSNS- to program oscillator frequency and FB, OCSET,

BBFB, and VDAC bias currents

VDAC

Regulated voltage programmed by the VID inputs. Current Sensing and PWM

operation are referenced to this pin. Connect an external RC network to VOSNS- to

program Dynamic VID slew rate.

OCSET

Programs the hiccup over-current threshold through an external resistor tied to

VDAC and an internal current source. Over-current protection can be disabled by

connecting this pin to a DC voltage no greater than 6.5V (do not float this pin as

improper operation will occur).

IIN

Current Sense input from the Phase IC(s). To ensure proper operation bias to at

least 250mV (don’t float this pin).

VDRP

Buffered IIN signal. Connect an external RC network to FB to program converter

output impedance

Inverting input to the Error Amplifier. Converter output voltage is offset from the

VDAC voltage through an external resistor connected to the converter output voltage

at the load and an internal current source.

EAOUT

Output of the Error Amplifier

BBFB

Input to the Regulation Detect Comparator. Connect to converter output voltage and

VDRP pin through resistor network to program recovery from VID step-down.

Connect to ground to diable Body Braking

TM during transition to a lower VID code.

VBIAS

6.8V/5mA Regulated output used as a system reference voltage for internal circuitry

and the Phase ICs

VCC

Power for internal circuitry

LGND

Local Ground and IC substrate connection

RMPOUT

Oscillator Output voltage. Used by Phase ICs to program Phase Delay

HOTSET

Inverting input to VRHOT comparator. Connect resistor divider from VBIAS to LGND

to program VRHOT threshold. Diode or thermistor may be substituted for lower

resistor for enhanced/remote temperature sensing. Applying a voltage exceeding

approximately 7.5V disables the oscillator for factory testing.

VRHOT

Open Collector output of the VRHOT comparator. Connect external pull-up.

SS/DEL

Controls Converter Softstart, Power Good, and Over-Current Delay Timing. Connect

an external capacitor to LGND to program the timing. An optional resistor can be

added in series with the capacitor to reduce the over-current delay time.

PWRGD

Open Collector output that drives low during Softstart and any external fault

condition. Connect external pull-up.

VIDPGD

Open Collector output of the VCCVID Power Good circuitry. Connect external pull-

up.

VIDDEL

Connect an external capacitor to LGND to program the VCCVID Power Good delay

Page 6

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