參數(shù)資料
型號： MAX1773EUP
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 電源管理
英文描述： 32-Bit Digital Signal Controller with ROM 100-BGA MICROSTAR -40 to 85
中文描述： 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20
封裝： 4.40 MM, TSSOP-20
文件頁數(shù)： 13/20頁
文件大小： 397K
代理商： MAX1773EUP
______________________________________________________________________________________
13
M
Power Source Selector for
Dual-Battery Systems
SYSTEM
STEP-DOWN
CHARGER
CHGB
CHGA
R12
R14
COMA
DISA
COMB
DISB
PDS
V
BATB+
V
BATA+
EXTLD
POWER CONNECTIONS
AC-ADAPTER
SUPPLY
Figure 9. 7-MOSFET Topology
The Battery Switchover Latch stops the MAX1773/
MAX1773A from oscillating when the device switches
from the selected battery and then the selected bat-
tery
’
s voltage recovers. According to the state table,
the MAX1773/MAX1773A would switch back to the
selected battery as soon as the battery
’
s voltage
recovered. The Battery Switchover Latch suspends the
state table as soon as the MAX1773/MAX1773A switch
over to the nonselected battery. This causes the
MAX1773/MAX1773A to continue to power from the
nonselected battery unless the latch is cleared. The
Battery Switchover Latch is cleared when BATSEL is
toggled (to select the other battery), when in the
Startup States mode, in the AC Adapter States mode,
and when the selected battery is removed (V
THM_
>
V
TCOMP
).
To prevent the MAX1773/MAX1773A from switching to a
discharged battery, the Low-Battery Latch suspends the
state table when the unconnected battery
’
s voltage is
below 5
V
MINV
and the discharging battery
’
s voltage
drops below 5
V
MINV
. Instead of switching to the
unconnected battery, the MAX1773/MAX1773A continue
to power from the discharging battery. This latch is
cleared when the unconnected battery is removed
(V
THM_
> V
TCOMP
), when in the Startup States mode,
when in the AC Adapter States mode, and if the uncon-
nected battery
’
s voltage rises above 5
V
MINV
.
The Discharged Battery Latch sets whenever the
MAX1773/MAX1773A are in the Standard Battery States
mode, both batteries are present (V
THM_
< V
TCOMP
),
one of the batteries is low (V
BAT_
< 5
V
MINV
), and the
other battery
’
s voltage is below V
ACDET
. While the
VBATA
>5
×
V
MINV
<5
×
V
MINV
X
X
<5
×
V
MINV
<5
×
V
MINV
X
VBATB
X
>5
×
V
MINV
>5
×
V
MINV
X
<5
×
V
MINV
X
<5
×
V
MINV
BATTERY A
Present
Present
Absent
Absent
X
X
Absent
BATTERY B
X
Present
Present
Absent
X
Absent
X
CONNECTION STATE
Battery A is connected to the load.
Battery B is connected to the load.
Battery B is connected to the load.
No connections.
No connections.
No connections.
No connections.
Table 3. Startup States
X = Don
’
t care, Present: V
THM_
< V
TCOMP
, Absent: V
THM_
> V
TCOMP
相關(guān)PDF資料
PDF描述
MAX1774 32-Bit Digital Signal Controller with ROM 100-BGA MICROSTAR -40 to 125
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MAX1775 32-Bit Digital Signal Controller with ROM 100-LQFP -40 to 125
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1773EUP+ 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1774EEI 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1774EEI+ 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Dual Step-Down w/Switchover RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1774EEI+T 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Dual Step-Down w/Switchover RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1774EEI-T 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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