參數(shù)資料
型號： SP6656
英文描述： High Efficiency 400mA Synchronous Buck Regulator with Bit Programmable Output
中文描述： 高效率400mA同步降壓穩(wěn)壓器的可編程輸出位
文件頁數(shù)： 3/17頁
文件大?。?/td> 185K
代理商： SP6656
3
Date: 7/9/04
SP6656 High Efficiency 400mA Synchronous Buck Regulator with Bit Programmable Output Copyright 2004 Sipex Corporation
PIN DESCRIPTION
PIN NUMBER
1
2
3
GND, OVSI = 0, this node is open.
4
OVSI
5
EN
power switches are opened.
6
FB
PIN NAME
P
VIN
V
IN
OVSO
DESCRIPTION
Input voltage power pin. Inductor charging current passes through this pin.
Internal supply voltage. Control circuitry powered from this pin.
Output Voltage Selection Output. OVSI = 1 PULLS THIS NODE TO
Output Voltage Select Input. See table I for definition.
EN = 1, device is enabled. EN = 0, All internal circuitry is disabled and
External feedback network input connection. Connect a resistor from
FB to ground and FB to V
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.
7
V
OUT
8
9
10
GND
P
GND
LX
FUNCTIONAL DIAGRAM
Table 1. Output Voltage Selection
V
IN
Zero_X
DRVON
Q
_
R
Q
S
Min Ton
BLON
D0
P
VIN
OVR_I
MIN Ton
OVR_I
K
OFF
/V
OUT
V
IN
LX
T
OFF
=
UVLO
BLANK = T
BLANK
(=100ns) or T
OFF
= K
OFF
/V
OUT
V
OUT
ILIM/M
REF
1
VOLOW
+
-
C
FB
+
-
V
RAMP
RST
P
GND
TSD
BLANK
+
300mV
+
-
C
UVLO
Internal Supply
REF'
-
OVR_I
V
OUT
DRVON
BLANK
ILIM/M
D1
VOLOW
+
-
C
T
ONOVER
Min T
ON
=
K
ON
/(
V
IN
-
V
OUT
)
Ref
Block
One-Shot
=100ns
DRVON
+
-
C
FB'
GND
REF
M
+
Vos
DRIVER
DRVON
T
ONOVER
VO
FB
V
OUT
OVSO
R
F
CF
22pF
R
I
R
S
Note:
R
A
=
I
S
V
O
O
S
V
O
e
g
a
V
t
p
O
0
n
e
p
O
V
W
O
L
_
T
U
O
R
(
8
=
I
R
+
F
) R
/
I
1
D
N
G
o
h
S
V
H
G
I
H
_
T
U
O
(
8
=
R
A
R
+
F
) R
/
A
R
I
R
S
R
I
+R
S
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