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SS6622 数据表(PDF) 1 Page - Silicon Standard Corp.

部件名 SS6622
功能描述  High Efficiency Synchronous Step-Up DC/DC Converter
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制造商  SSC [Silicon Standard Corp.]
网页  http://www.siliconstandard.com
标志 SSC - Silicon Standard Corp.

SS6622 数据表(HTML) 1 Page - Silicon Standard Corp.

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SS6620/21/2
High Efficiency Synchronous Step-Up DC/DC Converter
n FEATURES
l
High efficiency of 93% (VIN=2.4V, VOUT=3.3V,
IOUT=200mA).
l
Quiescent supply current of 20
µA.
l
Power-saving shutdown mode (0.1
µA typical).
l
Internal synchronous rectifier (no external diode )
l
Selectable current limit for reduced ripple
(SS6622).
l
Low noise, anti-ringing feature (SS6622)
l
On-chip low-battery detector.
l
Low-battery hysteresis
n APPLICATIONS
l
Palmtop & notebook computers.
l
PDAs
l
Wireless phones
l
Pocket organizers.
l
Cameras.
l
1 to 2-cell hand-held devices
n DESCRIPTION
The SS6620/21/22 are high-efficiency step-
up DC/DC converters, with start-up voltage as
low as 0.8V and operating with an input voltage
down to 0.7V. Consuming only 20
µA of quies-
cent current, these devices offer a built-in syn-
chronous rectifier that reduces size and cost by
eliminating the need for an external Schottky
diode, improving overall efficiency by minimiz-
ing losses.
The switching frequency depends on the load
and the input voltage and can range up to
500KHz. The peak current of the internal switch
is
fixed
at
0.8A
(SS6620),
at
0.45A
(SS6621), or is selectable (SS6622) for
design flexibility. Ripple does not exceed the
product of the switch current limit and the filter
capacitor equivalent-series-resistance (ESR).
The SS6622 also features a circuit that
eliminates noise caused by inductor ringing.
n TYPICAL APPLICATION CIRCUIT
Output 3.3V, or
Adj. (1.8V to 4.0V)
up to 300mA
Low-Battery
Detect Out
FB
GND
+
ON
OFF
+
Low-Battery
Detect In
0.1
µF
VIN
22
µH
220
µF
100
µF
SS6620
SS6621
SS6622
OUT
REF
LBO
SHDN
LX
LBI
LBO
FB
Rev.2.01 6/06/2003


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