AIC1340CS datasheet(6/7 Pages) AIC

6 / 7 page

AIC1340

Pin 7:

VIN2:

This pin supplies power to the in-

ternal regulator. Connect this pin

to a suitable 3.3V source.

Additionally, this pin is used to

monitor the 3.3V supply. If, fol-

lowing a start-up cycle, the volt-

age drops below 2.6V (typically),

the chip shuts down. A new soft-

start cycle is initiated upon return

of the 3.3V supply above the un-

der-voltage threshold.

Pin 8:

VOUT2: Output of the linear regulator.

Supplies current up to 500mA.

Pin 9:

GND:

Signal GND for IC. All voltage

levels are measured with respect

to this pin.

Pin 10: GATE3: Linear Controller output drive pin.

This pin can drive either a Dar-

lington NPN transistor or a N-

channel MOSFET.

Pin 11: FB3

Negative feedback pin for the

linear controller error amplifier

connect this pin to a resistor di-

vider to set the linear controller

output voltage.

Pin 12: COMP1 External compensation pin. This

pin is connected to error amplifier

output and PWM comparator. An

RC network is connected to FB1

in to compensate the voltage

control feedback loop of the con-

verter.

Pin 13: FB1

The error amplifier inverting input

pin. the FB1 pin and COMP1 pin

are used to compensate the volt-

age-control feedback loop.

Pin 14: OCSET: Current limit sense pin. Connect

a resistor ROCSET from this pin to

the drain of the external high-side

N-MOSFET. ROCSET, an internal

200

µA current source (I

OCSET),

and the upper N-MOSFET on-

resistance (RDS(ON)) set the over-

current trip point according to the

following equation:

PEAK

OCSET

DS(ON)

Pin 15: PGND:

Driver power GND pin. PGND

should be connected to a low im-

pedance ground plane in close to

lower N-MOSFET source.

Pin 16: LGATE: Lower N-MOSFET gate drive pin.

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