IR3622AMPBF datasheet(10/33 Pages) IRF

Part #	IR3622AMPBF

Description	HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING

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Manufacturer	IRF [International Rectifier]

Direct Link	http://www.irf.com

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IR3622AMPbF

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Circuit Description

10

THEORY OF OPEARTION

Introduction

The IR3622A is a versatile device for high

performance buck converters. It consists of two

synchronous buck controllers which can be

operated either in two independent outputs mode

or in current share single output mode for high

current applications.

The timing of the IC is provided by an internal

oscillator circuit which generates two-180o-out-of-

phase clock that can be externally programmed

up to 600kHz per phase.

Under-Voltage Lockout

The under-voltage lockout circuit monitors two

signals (Vcc and Enable). This ensures the

correct operation of the converter during power

up and power down sequence. The driver

outputs remain in the off state whenever one of

these signals drop below set thresholds. Normal

operation resumes once these signals rise above

the set values. Figure 3 shows a typical start up

sequence.

Enable

The enable features another level of flexibility for

start up. The Enable has precise threshold which

is internally monitored by under-voltage lockout

circuit.

It’s threshold can be externally programmed to

desired level by using two external resistors, so

the converter doesn’t start up until the input

voltage is sufficiently high (see figure 3).

Fig. 3: Normal Start up, Enable threshold is externally set to 11V

Seq pin is pulled to Vout3 prior to start up

Vcc

7.2V

Vout3

Enable

Vbus

4.1V

11V

12V

SS

3V

Enable OK (IC's POR)

Seq

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