參數(shù)資料
型號(hào)： MAX1773A
廠商： Maxim Integrated Products, Inc.
英文描述： Power Source Selector for Dual-Battery Systems
中文描述： 電源選擇器，用于雙電池系統(tǒng)
文件頁(yè)數(shù)： 19/20頁(yè)
文件大?。?/td> 397K
代理商： MAX1773A
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19
Differences Between MAX1773
and MAX1773A
This section discusses the differences between the
MAX1773 and MAX1773A for the situations detailed.
Note that the MAX1773 and MAX1773A are pin-to-pin
compatible.
PDS FET Switching
MAX1773: If battery B is selected but absent, and bat-
tery A is inserted with a voltage less than five times
MINV, when an adapter is inserted, the PDS FET does
not turn on. The problem also occurs if battery A is
selected but absent, and battery B is inserted with a
voltage less than five times MINV, when an adapter is
inserted, the PDS FET does not turn on.
In the MAX1773A, when the sequences discussed are
encountered, the part has been changed to enable the
PDS FET. This results in the PDS FET having to dissi-
pate less energy in the MAX1773A.
Selected Battery Present
But Under-Voltage
MAX1773: When the selected battery is present and
less than five times the MINV voltage, and a battery
above five times the MINV voltage is inserted at the
nonselected slot. In this case, the MAX1773 will not
enable discharge from the nonselected slot if the THM_
pin of the nonselected battery is valid after the TCOMP
pin goes high.
In the MAX1773A the order in which the THM_ and
TCOMP pins become enabled is unimportant for these
states. This results in this behavior not being encoun-
tered in the MAX1773A.
Switchover to Nonselected Battery
Upon Adapter Removal
MAX1773: When the selected battery is present and
less than five times MINV, and the nonselected battery
is present and greater than five times MINV. The
MAX1773 enables the discharge path from the non-
selected battery, which has a voltage greater than five
times MINV, which is an expected operation for the
part. If the AC adapter is then inserted, the charge path
to the selected battery is enabled, this is also expected
operation. When the adapter is removed, the MAX1773
does not switch to the nonselected battery, which is
the issue.
In the MAX1773A, when the AC adapter is removed in
the scenario detailed, three separate conditions are
possible:
1)
A charger is present but does not charge the
selected battery. This can happen if the input cur-
rent-limit feature in the charger has been activated,
reducing the charger current to zero. The AC
adapter is then removed. In this case the
MAX1773A allows discharge from the unselected
battery, whose voltage was above 5 x MINV.
2)
A charger is present and charges the selected bat-
tery. The battery is charged sufficiently so that it
can support the system load for more then 10ms.
(Assuming the typical application circuit with
100k
and 0.1μF on the AC adapter input.) When
the AC adapter is removed, the MAX1773A correct-
ly allows discharge from the selected battery.
3)
In the third scenario, the charger charges the
selected battery, but before the battery is sufficient-
ly charged to support the system load, the AC
adapter is removed. In this case, the MAX1773A
does not allow discharge from the unselected bat-
tery, whose voltage is above 5 x MINV. The limiting
condition is that the battery has to be sufficiently
charged to support the system load for 10ms.
M
Power Source Selector for
Dual-Battery Systems
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1773AEUP 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
MAX1773AEUP+ 功能描述:電池管理 Power Source Selector for Dual-Battery Systems RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1773AEUP+T 功能描述:電池管理 Power Source Selector for Dual-Battery Systems RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1773EUP 制造商:Maxim Integrated Products 功能描述:20 PINS TSSOP PKG - Bulk
MAX1773EUP+ 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
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