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參數(shù)資料
| 型號： | MAX1613EEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Bridge-Battery Backup Controllers for Notebooks |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | 0.150 INCH, 0.025 INCH PTICH, QSOP-16 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 136K |
| 代理商： | MAX1613EEE |
specifications vary, the counter frequency can be
adjusted to accommodate these variances by adjusting
C
CC
. Similarly, the discharging oscillator frequency can
be adjusted with the C
CD
capacitor. However, the rate
of bridge battery discharge depends on the DC-DC
converter’s load. Decrementing the charge/discharge
counter is used only to estimate the remaining charge
on the bridge battery. The counter increments (or
decrements) based on
CCMD
and
DCMD
logic states.
Note that the net charge must exceed the net dis-
charge to compensate for charging efficiency losses.
Figure 3 shows a typical stand-alone application (see
Design Procedure for details). It reduces the need for
an external microcontroller to manage these functions.
However, if the design requires greater flexibility, a
microcontroller can be used as shown in Figure 4.
DC-DC Converter
The DC-DC step-up converter is a pulse-frequency
modulated (PFM) type. The on-time is determined by
the time it takes for the inductor current to ramp up to
the peak current limit (set via R
BBON
), which in turn is
determined by the bridge battery voltage and the
inductor value. With light load or no load, the converter
is forced to operate in discontinuous-conduction mode
(where the inductor current decays to zero with each
cycle) by a comparator that monitors the LX voltage
waveform. The converter will not start a new cycle until
the voltage at LX goes below the battery voltage. At full
load, the converter operates at the crossover point
between continuous and discontinuous mode. This
“edge of continuous” algorithm results in the minimum
possible physical size for the inductor. At light loads,
the devices pulse infrequently to maintain output regu-
lation (V
FB
≥
2V). Note that the LX comparator requires
the DC-DC output voltage to be set at least 0.6V above
the maximum bridge battery voltage.
T imer Bloc k
The MAX1612/MAX1613 have an internal charge/dis-
charge counter that keeps track of the bridge-battery
charging/discharging process. When
CCMD
is low and
DCMD
is high, the internal counter increments until the
FULL pin goes high, indicating that the counter has
reached all 1s. The maximum counter value is 2
21
.
Additional pulses from the CC oscillator will not cause
the counter to wrap around. In the stand-alone applica-
tion (Figure 3), terminate the charging process auto-
matically by connecting FULL to
CCMD
. In a micro-
controller application, pull
CCMD
high. The counter
only specifies the maximum time for full charging; it
does not control the actual rate of charging.
CCMD
controls the charging switch, and the resistor at ISET
sets the charging rate.
During the discharging process, drive
DCMD
low in
order to begin decrementing the counter. When the
counter is full, FULL is high. As soon as the counter
decrements just two counts, the FULL pin sinks current,
indicating that the battery is no longer full. The counter
only indicates the relative portion of the charge remain-
ing. The incrementing and decrementing rate depends
on the maximum charge and discharge times set forth
by charging and discharging rates (see the following
equations for CC and CD). Note that the actual dis-
charging is caused by the input current of the step-up
DC-DC converter loading down the bridge battery,
which is controlled via
BBON
rather than by
DCMD
.
The CC and CD capacitor values determine the
upcount and downcount rates by controlling the dis-
charging oscillator frequency. Determine the maximum
charge and discharge times as follows:
C
CC
(nF) = 4.3
·
t
HRS
C
CD
(nF) = 4.3
·
t
HRS
where C
CC
is the charging capacitor, C
CD
is the dis-
charging capacitor and t
HRS
is the maximum time in
hours for the process. Choose values that allow for
losses in the battery charging and discharging
process, such as battery charging inefficiencies, errors
in charging current value caused by variable main bat-
tery voltages, leakage currents, and losses in the
device’s internal switch. For charging, use the standard
charge rate recommended by the battery manufactur-
er.
The maximum charging current is restricted to
the battery specifications. Consult the battery man-
ufacturer’s specifications. Do not set the charging
current above 10mA.
M
Bridge-Battery Bac kup Controllers
for Notebooks
_______________________________________________________________________________________
7
MICROCONTROLLER
I/O
BBON
LRO
GND
250k
1M
MAX1612
MAX1613
2N7002
Figure 2. Reducing
BBON
Noise Sensitivity
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1613EEE+ | 功能描述:電池管理 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 |
| MAX1613EEE+T | 功能描述:電池管理 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 |
| MAX1613EEE-T | 功能描述:電池管理 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 |
| MAX1614C/D | 功能描述:功率驅動器IC RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX1614C/D+ | 功能描述:功率驅動器IC RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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