IR3522 datasheet(2/32 Pages) IRF

2 / 32 page

IR3522

Page 2

V3.01

ORDERING INFORMATION

Device

Package

Order Quantity

IR3522MTRPBF

32 Lead MLPQ (5 x 5 mm body)

3000 per reel

* IR3522MPBF

32 Lead MLPQ (5 x 5 mm body)

100 piece strips

* Samples only

PIN DESCRIPTION

PIN#

PIN SYMBOL

PIN DESCRIPTION

SDA

SDA (Serial Data) is a bidirectional signal that is an input and open drain output for

both master (I

2C controller) and slave (IR3522). SDA requires a pull resistor to a

bias voltage and should not be floated.

PGBIAS

Input to provide bias to the Power Good output transistor directly from the converter

input voltage. Enables the Power Good output to assert even if there is no bias

supplied to the VCCL pin. Internal voltage clamp protects the pin. Do not exceed

100 uA of pull-up current.

ENABLE

Enable input. A logic low applied to this pin puts the IC into fault mode. A logic high

on the pin resets and enables the converter. Do not float this pin as the logic state

will be undefined.

IIN2

Output 2 average current input from the output 2 phase IC(s).

ADDR1

Digital input to program bit 1 of the 2 bit address code with internal pull-up. Connect

to LGND for logic “0”, float for logic “1”

ADDR2

Digital input to program bit 2 of the 2 bit address code with internal pull-up. Connect

to LGND for logic “0”, float for logic “1”

OCSET2

Programs the output 2 constant converter output current limit through an external

resistor tied to VREF1 and an internal current source from this pin. Over-current

protection can be disabled by over sizing the resistor value to program the threshold

higher than IIN2 pin possible signal amplitude, but no greater than 5V (do not float

this pin as improper operation will occur).

EAOUT2

Output of the output 2 error amplifier.

FB2

Inverting input to the output 2 error amplifier.

VOUT2

Output 2 remote sense amplifier output.

VOSEN2+

Output 2 remote sense amplifier input. Connect to output at the load.

VOSEN2-

Output 2 remote sense amplifier input. Connect to ground at the load.

VOSEN1-

Output 1 remote sense amplifier input. Connect to ground at the load.

VOSEN1+

Output 1 remote sense amplifier input. Connect to output at the load.

VOUT1

Output 1 remote sense amplifier output. Provides reference to Error Amp2.

FB1

Inverting input to the output 1 error amplifier.

EAOUT1

Output of the output 1 error amplifier.

OCSET1

Programs the output 1 constant converter output current limit through an external

resistor tied to VREF1 and an internal current source from this pin. Over-current

protection can be disabled by over sizing the resistor value to program the threshold

higher than IIN2 pin possible signal amplitude, but no greater than 5V (do not float

this pin as improper operation will occur).

VREF1

Reference voltage programmed by the I

2C inputs and error amplifier non-inverting

input. Connect an external RC network to LGND to program dynamic VID slew rate

and provide compensation for the internal buffer amplifier.

SS/DEL1

Connect an external capacitor to LGND to program startup and Fault delay timing

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