PIN DESCRIPTION
PIN NUMBER
1
2
3
PIN NAME
PV
IN
V
IN
PWR
GD
DESCRIPTION
Input voltage power pin. Inductor charging current passes through this pin.
Internal supply voltage. Control circuitry powered from this pin.
Open drain Power Good indicator. If V
FB
is less than 750mV this pin is
pulled to ground. When V
FB
is above 750mV this pin is open. Connect
a resistor from this pin to V
IN
or V
OUT
to create a logic signal.
Digital mode control input. See table I for definition.
Digital mode control input. See table I for definition.
External feedback network input connection. Connect a resistor from
FB to ground and FB to V
OUT
to set the output voltage. This pin
regulates to the internal bandgap reference voltage of 0.8V.
Output voltage sense pin. Used by the timing circuit to set minimum on
and off times.
Internal ground pin. Control circuitry returns current to this pin.
Power ground pin. Synchronous rectifier current returns through this pin.
Inductor switching node. Inductor tied between this pin and the output
capacitor to create regulated output voltage.
4
5
6
D1
D0
FB
7
8
9
10
V
OUT
GND
P
GND
LX
FUNCTIONAL DIAGRAM
Vin
DRVON
VOLOW
TONOVER
MIN Ton
Internal Supply
TONOVER
REF
+
V
OUT
PV
IN
Min Ton
Min Ton =
K
ON
/(V
IN
-V
OUT
)
M
DRVON
R
S
Q
1
OVR_I
Vos
-
REF'
+
-
VOLOW
+
DRIVER
C
ILIM/M
-
C
V
RAMP
_
Q
FB
+
-
FB'
RST
OVR_I
LX
DRVON
REF
Ref
Block
UVLO
TSD
D0
D1
+
One-Shot
=100ns
BLANK
-
C
Zero_X
P
GND
T
OFF
=
K
OFF
/V
OUT
ILIM/M
OVR_I
750mV
GND
+
-
C
PWR
GD
DRVON
BLANK
BLANK = Tblank(=100ns) or Toff = Koff/Vout
FB
UVLO
Date: 2/1/05
SP6654 High Efficiency 800mA Synchronous Buck Regulator
© Copyright 2005 Sipex Corporation
4
SIPEX [ SIPEX CORPORATION ]
