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SW2, SW1 (Pins 15, 25): Switch Node Connections to
Inductors. Voltage swing at these pins is from a Schottky
diode (external) voltage drop below ground to V
BOOST2, BOOST1 (Pins 17, 24): Bootstrapped Supplies
to the Top Side Floating Drivers. Capacitors are connected
between the boost and switch pins and Schottky diodes
are tied between the boost and INTV
at the boost pins is from INTV
BG2, BG1 (Pins 18, 22): High Current Gate Drives for
Bottom (Synchronous) N-Channel MOSFETs. Voltage
swing at these pins is from ground to INTV
PGND (Pin 19): Driver Power Ground. Connects to the
sources of bottom (synchronous) N-channel MOSFETs, an-
odes of the Schottky rectifiers and the (–) terminal(s) of C
INTV
(Pin 20): Output of the Internal 5V Linear Low
CC
Dropout Regulator and the EXTV
control circuits are powered from this voltage source. Must
be decoupled to power ground with a minimum of 4.7µF
tantalum or other low ESR capacitor.
EXTV
(Pin 21): External Power Input to an Internal
CC
Switch Connected to INTV
supplies V
power, bypassing the internal low dropout
CC
regulator, whenever EXTV
CC
EXTV
connection in Applications section. Do not exceed
CC
7V on this pin.
V
(Pin 23): Main Supply Pin. A bypass capacitor should
IN
be tied between this pin and the signal ground pin.
PGOOD (Pin 27): Open-Drain Logic Output. PGOOD is
pulled to ground when the voltage on either V
not within ±7.5% of its set point.
W
FU CTIO AL DIAGRA
PLLIN
F
PHASE DET
IN
DUPLICATE FOR SECOND
50k
CONTROLLER CHANNEL
PLLFLTR
CLK1
R
LP
OSCILLATOR
CLK2
C
LP
–
0.86V
S
Q
+
R
Q
V
OSENSE1
PGOOD
–
+
0.74V
–
0.86V
0.55V
+
V
OSENSE2
–
+
0.74V
I1
V
SEC
3V
+
–
4.5V
–
0.18µA
–
BINH
+
R6
FCB
0.86V
+
4(V
)
FB
FCB
R5
–
SLOPE
COMP
3.3V
0.8V
OUT
+
V
REF
–
V
IN
V
IN
4.8V
+
5V
1.2µA
EXTV
–
LDO
CC
REG
INTV
6V
CC
5V
+
INTERNAL
SGND
SUPPLY
.
IN
pins. Voltage swing
CC
to (V
+ INTV
).
CC
IN
CC
.
CC
IN
Switch. The driver and
CC
. This switch closes and
CC
is higher than 4.7V. See
pin is
OSENSE
INTV
V
CC
IN
D
B
BOOST
TG
C
B
+
DROP
TOP
OUT
C
IN
D
1
DET
BOT
FCB
SW
TOP ON
SWITCH
INTV
CC
LOGIC
BG
BOT
PGND
+
B
+
–
SHDN
R
SENSE
INTV
CC
I2
–
+
+
–
+
+
+
SENSE
D
C
30k
SEC
SEC
3mV
–
SENSE
30k
45k
45k
2.4V
V
R2
OSENSE
V
FB
–
EA
+
0.80V
R1
OV
+
–
0.86V
C
C
I
TH
SHDN
RUN
R
C
C
C2
RST
SOFT
4(V
)
START
FB
RUN/SS
C
SS
M24C02-WDW6TP (STMICRO)
SERIAL I
2
C BUS EEPROM
– TOP VIEW –
.
VGN-S36C/S36GP/S36LP/S36SP/S36TP/S38CP/S52B/
S62PS/S62PSY/S62S/S350F/S350FP/S360/S360P/S370F
1-24
IC
Confidential
(J/AM/AO)
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