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參數(shù)資料
| 型號： | MAX1612 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Bridge-Battery Backup Controllers for Notebooks |
| 中文描述： | 備用橋接電池控制器，用于筆記本電腦 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 136K |
| 代理商： | MAX1612 |
where V
OUT
is the DC-DC converter’s output voltage
and V
TRIP
is the voltage level the main battery must fall
below to trip the low-battery comparator. For example,
for a +5V boost DC-DC output, a 4.75V main battery
trip level is feasible. For this case, R1 = 750k
, R2 =
26k
, and R3 = 474k
.
Step 6:
Select a resistor value to set the charging cur-
rent. The resistor value at ISET limits the current
through the switch for bridge-battery charging. There is
a voltage drop across the high-voltage switch (see
Electrical Characteristics) with a typical value of 1V.
The maximum charge current through the internal high-
voltage switch is 10mA.
R
ISET
= (V
CHARGE
- V
SWITCH
- V
BBATT
) / I
CHARGE
where V
CHARGE
is the charging supply voltage,
V
SWITCH
is the drop across the high-voltage internal
switch, V
BBATT
is the bridge battery voltage, and
I
CHARGE
is the charge current (in amperes).
S tand-Alone Applic ation
To reduce cost and save space, the MAX1612/
MAX1613 can be operated in a stand-alone configura-
tion, which eliminates the need for a microcontroller. A
stand-alone configuration could also reduce the work-
load of an existing microcontroller in the system, thus
allowing these unused I/Os to be used for other appli-
cations.
Figure 3 shows the MAX1612/MAX1613 operating with-
out the microcontroller by using the low-battery detec-
tor to monitor the main battery. If the main battery is too
low,
LBO
pulls
BBON
and
DCMD
low to start the DC-
DC step-up converter and allow the bridge battery to
discharge. If the bridge battery requires charging,
FULL pulls
CCMD
low to start the battery charging
process. If both
CCMD
and
DCMD
are low, discharg-
ing takes precedence and the bridge battery keeps the
boost DC-DC converter active.
Mic roc ontroller-Based Applic ation
The MAX1612/MAX1613 are also suited to operate in a
microcontroller-based system. A microcontroller-based
application provides more flexibility by allowing for sep-
arate, independent control of the charging process, the
DC-DC converter, and the counter. Independent con-
trol can be beneficial in situations where other subsys-
tems are operating, so that automatic switchover of
power might create some timing issues. If necessary, a
microcontroller can be used to reset the counter by tak-
ing ISET low. Another advantage of a microcontroller-
based system is the ability to stop charging the bridge
battery during a fault condition.
Figure 4 shows an example of how the MAX1612/
MAX1613 can be interfaced to a MAX1630 to deliver
the input voltage to the main DC-DC converter. In this
example, the microcontroller monitors the main bat-
tery’s status and switches over to the bridge battery
when V
MAIN
falls below a specified trip level (see
Design Procedure). When V
MAIN
falls below the LBI
threshold,
LBO
goes low. This signals the microcon-
troller, via an I/O, to switch over to the bridge battery as
the input source to the system main DC-DC converter.
In this application, the microcontroller also initiates the
bridge-battery charging process. When
CCMD
goes
low with
DCMD
high, the battery is charged through the
internal switch. The counter increments until it overflows
and FULL goes high, indicating a full charge. The
microcontroller I/O can read and write the appropriate
states to control the execution and timing of the entire
process.
If the main DC-DC is supplied by the main source, the
MAX1612/MAX1613’s step-up converter turns off, mini-
mizing power consumption. The device typically draws
only 18μA of quiescent current under this condition.
M
Bridge-Battery Bac kup Controllers
for Notebooks
______________________________________________________________________________________
11
Table 5. Surface-Mount Inductor Information
MANUFACTURER
AND PART
INDUCTANCE
(μH)
RESISTANCE
(
)
RATED CURRENT
(A)
HEIGHT
(mm)
Sumida CD54-100
10
0.100
1.44
4.5
Sumida CD43-8R2
8.2
0.132
1.26
3.2
Sumida CD43-150
15
0.235
0.92
3.2
Sumida CD54-150
15
0.140
1.30
4.5
Sumida CD54-220
22
0.180
1.11
4.5
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| MAX16125WTDB29+T | 功能描述:監(jiān)控電路 Dual Pushbutton Controller RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX16125WTEJ00+T | 功能描述:監(jiān)控電路 Dual Pushbutton Controller RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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