參數(shù)資料
型號(hào)： DS1227
英文描述： KickStarter Chip
中文描述： Kickstarter的芯片
文件頁(yè)數(shù)： 3/20頁(yè)
文件大?。?/td> 156K
代理商： DS1227
DS1227
022698 3/20
INPUT SUPPLY VOLTAGE
The Kickstarter is capable of operating either in a regu-
lated step-up DC-to-DC conversion (boost) mode or in a
non-regulated supply voltage Pass-Through mode.
In boost mode, the Kickstarter is designed to provide a
regulated +5V output on the V
CCO1
, V
CCO2
, or V
CCO3
voltage supply output pins from a +3V lithium source.
Figure 1 illustrates the standard configuration for use of
this mode. The BOOST pin should be tied low in order to
enable step-up DC-to-DC conversion. V
DCI
is used for
the DC power supply input and is tied through an induc-
tor (270
μ
H typical) to a +3V lithium cell. V
DCO
is the
main DC output which is switched to the V
CCO1
, V
CCO2
,
and V
CCO3
outputs. This pin requires a large capacitor
(typically 100
μ
F) to ground for the boost regulation low
pass output network. Further details of the boost voltage
regulator operation are given in the “Boost Mode Opera-
tion” section of this data sheet.
Figure 2 and Figure 3 illustrate the required configura-
tions to select the supply voltage Pass-Through mode of
operation. In both of these configurations the BOOST
pin should be strapped directly to the V
DCO
pin. This
connection causes the BOOST pin to remain at a high
level at all times that a battery is connected. As a result,
the internal boost regulator will be disabled when kick-
starting occurs. When a +5V supply is used as the input
DC power source, it should be directly connected to the
V
DCO
in parallel with a filter capacitor as shown in Figure
2. The V
DCI
input itself should be grounded in this con-
figuration.
If a +6V supply is used, then it should be connected to
the V
DCI
pin. A filter capacitor should still be connected
to V
DCO
. The voltage on V
DCO
and subsequently on
V
CCO1
, V
CCO2
, and V
CCO3
(when they are enabled fol-
lowing kickstarting) will be a diode drop below the V
DCI
voltage.
In both the Boost and Pass-Through modes, the
DS1227 uses the voltage on V
DCO
as its own internal
supply.
DS1227 BOOST MODE CONFIGURATION
Figure 1
–
+
DS1227
KICKSTARTER
GND
+3V
270 uH (typ.)
100 uF
Filter
(typ.)
.01 uF
Bypass
(typ.)
BOOST
V
DCO
V
CC01
V
CC02
V
CC03
V
DCI
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參數(shù)描述
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