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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)： | 17/20頁 |
| 文件大?。?/td> | 397K |
| 代理商： | MAX1773EUP |
______________________________________________________________________________________
17
M
Power Source Selector for
Dual-Battery Systems
In applications where the battery voltage always falls
away slowly, t
SWITCHOVER
is primarily composed of the
Battery Switchover Delay. However, in applications
where the battery voltage can suddenly fall away,
t
SWITCHOVER
is substantially increased because it is
primarily composed of the Battery Action Delay (Figures
1 and 2).
Ideally, when a battery is removed from the system, the
thermistor connection is broken before the battery
’
s
power path is broken. In this case, t
SWITCHOVER
is typi-
cally bound by the Thermistor Action Delay (Figures 3
and 4). However, if the battery
’
s power path is broken
first, then t
SWITCHOVER
primarily consists of the shorter
of the following times: time until the thermistor connec-
tion is broken plus the Thermistor Action Delay, or the
Battery Action Delay.
Source Switchover Transients
When the MAX1773/MAX1773A suddenly switch a
power supply to the load, they create a current transient
from the source to charge up the capacitance on the
load. The peak current drawn is approximated by:
where
V
EXTLOAD
is the voltage difference between the
supply switched off and the supply switched on,
R
SOURCE
is the source resistance of the power supply
switched on, R
SWITCH
is the R
DS(ON)
of the PMOS FETs
in the path, and R
ESR
is the equivalent series resistance
of the output capacitance.
The duration of the current transient is determined by
R
SOURCE
, R
SWITCH
, R
ESR
, and the output capacitance.
Smaller resistances and less output capacitance reduce
the transient duration.
Typical Operation
Figure 12 shows a typical discharge and charge cycle
for a system utilizing the MAX1773/MAX1773A, two
3-cell lithium-ion (Li+) batteries, and a 20V AC adapter
power supply. The diagram starts with the AC adapter
applied, no batteries present, and battery A selected
(see
AC Adapter States
). BATSTAT =
BATSEL
= 1 indi-
cates that battery A is not present and battery A
’
s
IPK
EXTLOAD
SWITCH
R
SOURCE
ESR
V
R
R
=
+
+
A RSN,N ATREA DPE EMVD
BT NETD
BT NETD
BT
AL EOW
5
MN
ETRA OA DPE PLE
V
BT
AL EOW
5
MN
,SSEMSUSDW
ETRA OTOLRRAT
V
ACDET
V
BATB
V
BATA
t
0
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
V
EXTLD
BATSEL
BATSTAT
0
1
0
0
0
0
0
0
0
0
0
1
0
1
1
1
1
1
1
0
1
1
1
0
0
0
0
0
0
0
ACPRES
20V
3.3V
20V
8V
12.6V
8V
12.6V
8V
Figure 12. Charge/Discharge Example
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1774 | 32-Bit Digital Signal Controller with ROM 100-BGA MICROSTAR -40 to 125 |
| MAX1774EEI | Dual, High-Efficiency, Step-Down Converter with Backup Battery Switchover |
| MAX1774EMJ | 32-Bit Digital Signal Controller with ROM 100-LQFP -40 to 85 |
| MAX1775 | 32-Bit Digital Signal Controller with ROM 100-LQFP -40 to 125 |
| MAX1775EEE | 32-Bit Digital Signal Controller with ROM 100-LQFP -40 to 125 |
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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