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SP6651A Datasheet(PDF) 3 Page - Sipex Corporation

Part No. SP6651A
Description  High Efficiency 800mA Synchronous Buck Regulator Ideal for portable designs powered with Li Ion battery
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Maker  SIPEX [Sipex Corporation]
Homepage  http://www.sipex.com
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SP6651A Datasheet(HTML) 3 Page - Sipex Corporation

 
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Date: 5/25/04
SP6651A High Efficiency 800mA Synchronous Buck Regulator
© Copyright 2004 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
BLON
Open drain battery low output. (V
IN-VO) less than 300mV pulls this
node to ground. (V
IN-VO) above threshold, this node is open.
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 V
OUT 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
D1
D0
00
Shutdown. All internal circuitry is disabled and the power switches are opened.
01
Device enabled, falling UVLO threshold =2.70V
10
Device enabled, falling UVLO threshold =2.85V
11
Device enabled, falling UVLO threshold =3.00V
Table 1. Operating Mode Definition
V
IN
Zero_X
DRVON
Q
R
Q
S
Min Ton
BLON
D0
PV
IN
OVR_I
MIN Ton
OVR_I
K
OFF/VOUT
Vin
LX
T
OFF =
UVLO
BLANK = Tblank(=100ns) or Toff = Koff/Vout
V
OUT
ILIM/M
REF
1
VOLOW
_
FB
+-
V
RAMP
RST
P
GND
TSD
BLANK
+
-
300mV
+
-
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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