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SS6621 数据表(PDF) 7 Page - Silicon Standard Corp.

部件名 SS6621
功能描述  High Efficiency Synchronous Step-Up DC/DC Converter
PDF  12 Pages
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制造商  SSC [Silicon Standard Corp.]
网页  http://www.siliconstandard.com
标志 SSC - Silicon Standard Corp.

SS6621 数据表(HTML) 7 Page - Silicon Standard Corp.

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SS6620/21/2
n BLOCK DIAGRAM
+
+
+
+
+
OUT
VIN
CLSEL
SHDN
LBO
LBI
REF
FB
Mirror
Q
R
S
F/F
Minimum Off-Time
One Shot
Ref erence Voltage
GND
LX
BATT
L
1
R1
200
Ω
Q3
Q2
Q1
Damping
Switch
Maximum On-Time
OUT
One Shot
C3
220
µF
C1
100
µF
47
µF
0.1
µF
C4
0.1
µF
n PIN DESCRIPTIONS
SS6620/ SS6621
PIN 1: FB-
Connect to OUT for +3.3V output.
Use a resistor network to set the out-
put voltage from +1.8V to +4.0V.
PIN 2: LBI-
Low-battery comparator input. Inter-
nally set to trip at +1.23V.
PIN 3: LBO- Open-drain low battery comparator
output. Output is low when VLBI is
<1.23V. LBO is high impedance dur-
ing shutdown.
PIN 4: REF-
1.23V reference voltage. Bypass with
a 0.1
µF capacitor.
PIN 5: SHDN- Shutdown
input.
High=operating,
low=shutdown.
PIN 6: GND-
Ground
PIN 7: LX-
N-channel
and
P-channel
power
MOSFET drain.
PIN 8: OUT-
Power output. OUT provides boot-
strap power to the IC.
Rev.2.01 6/06/2003



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