AIC1341 Analog Intergrations Corporation, AIC1341 Datasheet - Page 5

• Manufacturer Part Number: AIC1341
• Description: High Performance/ Triple-Output/ Auto-Tracking Combo Controller
• Manufacturer: Analog Intergrations Corporation

n
PIN DESCRIPTIONS
Pin 3:
Pin 4:
Pin 6:
Pin 7:
Pin 1: PHASE: Over-current detection pin. Con-
Pin 2:
Pin 5:
UGATE: External high-side N-MOSFET
SD:
VCC:
SS:
FB2:
VIN2:
nect the PHASE pin to source of
the
MOSFET. This pin detects the
voltage drop across the high-side
N-MOSFET
current protection.
gate drive pin. Connect UGATE
to gate of the external high-side
N-MOSFET.
To shut down the system, active
high or floating. If connecting a
resistor to ground, keep the re-
sistor less than 4.7KΩ
The chip power supply pin. It also
provides the gate bias charge for
all the MOSFETs controlled by
the IC. Recommended supply
voltage is 12V.
Soft-start pin. Connect a capaci-
tor from this pin to ground. This
capacitor, along with an internal
10 A (typically) current source,
sets the soft-start interval of the
converter.
Pulling this pin low will shut down
the IC.
Connect this pin to a resistor d i-
vider to set the linear regulator
output voltage.
This pin supplies power to the
internal 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 r e -
external
R
DS(ON)
high-side
for
over-
N-
Pin 8:
Pin 9:
Pin 10: GATE3: Linear Controller output drive pin.
Pin 11: FB3
Pin 12: COMP1 External compensation pin. This
Pin 13: FB1
Pin 14: OCSET: Current limit sense pin. Connect
GATE2: Linear Controller output drive pin.
GND:
turn of the 3.3V supply above
the under-voltage threshold.
This pin can drive either a Dar-
lington NPN transistor or a N-
channel MOSFET.
Signal GND for IC. All voltage
levels are measured with respect
to this pin.
This pin can drive either a Dar-
lington NPN transistor or an N-
channel MOSFET.
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 is connected to error ampli-
fier output and PWM comparator.
A RC network is connected to
FB1 to compensate the voltage
control feedback loop of the con-
verter.
The error amplifier inverting input
pin. The FB1 pin and COMP1 pin
are used to compensate the volt-
age-control feedback loop.
a resistor R
the drain of the external high-side
N-MOSFET. R
200 A current source (I
and the upper N-MOSFET on-
resistance (R
current trip point according to the
following equation:
I
PEAK
I
OCSET
OCSET
R
DS(ON)
DS(ON)
OCSET
AIC1341
R
from this pin to
) set the over-
OCSET
, an internal
OCSET
5
),