AIC1573 AIC [Analog Intergrations Corporation], AIC1573 Datasheet - Page 11

• Manufacturer Part Number: AIC1573
• Description: 5-bit DAC, Synchronous PWM Power Regulator with Simple PWM Power Regulator, LDO And Linear Controller
• Manufacturer: AIC [Analog Intergrations Corporation]

Pin14: VSEN4: Connect this pin to the 1.8V
Pin15: DRIVE4: Connect this pin to the gate of
Pin 16: VAUX:
Pin 18: DRIVE3: Connect this pin to the Gate of
Pin 19: VSEN3: Connect this pin to the 1.5V
Pin 20: COMP1: External compensation pin of the
Pin 17: GND:
creasing the frequency by the
following figure (Fig.3).
This pin is 1.26V during normal
operation, but it is pulled to VCC
in the event of an over-voltage or
over-current condition.
R
R
where
linear regulator’s output. This pin
is monitored for under-voltage
events.
the external N-MOS to supply
1.8V power for Memorey re-
quirement.
The +3.3V input voltage at this
pin is monitored for power-on –
reset (POR) purpose. Connect to
+5V provides boost current for
the linear regulator’s output.
Signal GND for IC. All voltage
levels are measured with respect
to this pin.
the external N-MOS for providing
1.5V power to GTL bus.
linear regulator’s output. This pin
is monitored for under-voltage
events.
synchronous
This pin is connected to error
amplifier output and PWM com-
parator. A RC network is con-
f
f
T
T
pulled to GND
pulled to VCC,
f
f
0
0
f is free run frequency.
1
1
0
VCC
25
R
.
T
2
5
K
PWM
R
. 1
,
T
26
V
converter.
,
Pin 21: FB1:
Pin 22: VSEN1: Synchronous PWM converter’s
Pin 23: OCSET1: Current limit sense pin. Connect
Pin 24: PGND:
Pin 25: LGATE1: Lower N-MOSFET gate drive pin
Pin 26: PHASE1:
nected to FB1 in to compensate
the voltage control feedback loop
of the converter.
The error amplifier inverting i n put
pin of the synchronous PWM
converter. The FB1 pin and
COMP1 pin are used to compen-
sate the voltage-control feedback
loop.
output voltage sense pin. Con-
nect this pin to the converter out-
put. The PGOOD and OVP com-
parator circuits use this signal to
report output voltage status and
for over-voltage protection func-
tion.
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:
The voltage at this pin is also
moni tored for power-on reset
(POR) purpose.
Driver power GND pin. PGND
should be connected to a low im-
pedance ground plane in close to
lower N-MOSFET source.
of the synchronous PWM con-
verter.
Over-current detection pin. Con-
I
PEAK
I
OCSET
OCSET
R
DS(ON)
DS(ON)
OCSET
AIC1573
R
from this pin to
OCSET
) set the over-
, an internal
OCSET
11
),