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)： 18/20頁
文件大小： 397K
代理商： MAX1773EUP
M
Power Source Selector for
Dual-Battery Systems
18
______________________________________________________________________________________
charge path is not connected. If the external controller
polled the MAX1773/MAX1773A as described in
Status
and Configuration
, then BATSTAT would return
BATSEL
(0) to indicate that battery B is not present.
At t
1
, battery A is inserted and the MAX1773/
MAX1773A connect battery A
’
s charge path. Note that
BATSTAT changes to BATSEL (0) to indicate that bat-
tery A is present.
At t
2
, battery B is inserted. BATSTAT does not change
and still indicates that battery A is present.
At t
3
, the AC adapter is removed and the
MAX1773/MAX1773A automatically disconnect battery
A
’
s charge path and connect battery A
’
s discharge
path (see
Standard Battery States
).
ACPRES
changes
to 1 to indicate that the AC adapter source is no longer
present. BATSTAT = BATSEL (0) to indicate that battery
A is present and supplying the load. Between t
3
and t
4
,
battery A discharges as it supplies the load.
At t
4
, battery A
’
s voltage falls below 5
V
MIN,
and the
MAX1773/MAX1773A automatically disconnect battery
A
’
s discharge path and connect battery B
’
s discharge
path. BATSTAT goes to
BATSEL
(1) to indicate that bat-
tery A is no longer supplying the load.
Shortly after BATSTAT goes high, the external controller
should catch up to the MAX1773/MAX1773A and
change BATSEL. This is shown at t
5
. BATSTAT remains
at 1, indicating that battery B is present and supplying
the load.
At t
6
, battery B falls below 5
V
MIN,
and the
MAX1773/MAX1773A automatically disconnect battery
B
’
s discharge path and connect battery A
’
s discharge
path. BATSTAT changes to
BATSEL
(0) to indicate that
battery B is no longer supplying the load. At this point,
the external controller orders a controlled shutdown of
the system and drastically reduces the supply current.
At t
7
, the AC adapter supply is reconnected to the sys-
tem. The MAX1773/MAX1773A automatically discon-
nect battery A
’
s discharge path, connects the AC
adapter
’
s load path (PDS switch), and connects battery
B
’
s charge path. BATSTAT goes to BATSEL (1) to indi-
cate that battery B is present.
ACPRES
goes to 0 to
indicate that the AC adapter source is present.
At t
8
, the external controller recognizes that battery B is
charged and changes BATSEL to battery A. BATSTAT
goes to BATSEL (0) to indicate that battery A is present.
After t
9
, the batteries are fully charged and the system
is ready for another cycle.
Power MOSFET Selection
The MAX1773/MAX1773A do not place stringent
requirements on the external PMOS FETs. Use PMOS
FETs with low V
GS
thresholds (logic level FETs). Low
R
DS(ON)
PMOS FETs are desirable since the PMOS
FET
’
s resistance directly contributes to power losses.
Also, ensure that the PMOS FET
’
s V
DS
and V
GS
ratings
exceed the specific circuit requirements. See Table 5
for a list of recommended manufacturers.
Layout Guidelines
The MAX1773/MAX1773A do not use fast switching
times or high frequencies. Therefore, the layout require-
ments are minimal. Keep the gate connections to the
external PMOS FETs short to minimize capacitive cou-
pling, reduce parasitic inductance, and ensure stability.
In addition, minimize the power path length when pos-
sible to reduce the path
’
s resistance. See the MAX1773
evaluation kit for a layout example.
SUPPLIER
Fairchild
IR
Siliconix
PHONE
FAX
408-822-2000
310-322-3331
408-988-8000
408-822-2102
310-322-3332
408-970-3950
Table 5. Recommended Manufacturers
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
BATB
THMB
CHGB
DISB
DISA
CHGA
THMA
BATA
TOP VIEW
COMB
V
DD
TCOMP
BATSEL
EXTLD
MINV
GND
COMA
12
11
9
10
ACPRES
BATSTAT
ACDET
PDS
MAX1773
MAX1773A
TSSOP
Pin Configuration
Chip Information
TRANSISTOR COUNT: 5245
PROCESS: BiCMOS
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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 安裝風格:SMD/SMT
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