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SP6654 Datasheet(PDF) 4 Page - Sipex Corporation

Part No. SP6654
Description  High Efficiency 800mA Synchronous Buck Regulator
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Maker  SIPEX [Sipex Corporation]
Homepage  http://www.sipex.com
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SP6654 Datasheet(HTML) 4 Page - Sipex Corporation

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


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