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參數(shù)資料
| 型號： | MAX1736EUT42-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SOT23, Single-Cell Li+ Battery Charger for Current-Limited Supply |
| 中文描述： | BATTERY CHARGE CONTROLLER, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 179K |
| 代理商： | MAX1736EUT42-T |
6
____________________________________________________________________________________________________
Once the switch turns off, it remains off for at least the
minimum off-time. After the minimum off-time, the P-
channel MOSFET turns on if the cell voltage is lower
than the BATT regulation voltage. A C
CT
value of
0.33μF sets a minimum off-time of 33ms.
At the beginning of the pulsed top-off state, charge cur-
rent is modulated at approximately an 83% duty cycle.
Toward the end of top-off, charge current stays off for
long periods of time between single
“
on
”
pulses. During
these final pulses, the instantaneous cell voltage may
exceed the BATT regulation voltage by several hun-
dred millivolts, but these pulses are orders of magni-
tude shorter than the electrochemical time constant of
the Li+ cell and do no harm. Pulsed top-off charge
ends when the cell voltage no longer falls below the
BATT regulation voltage. Figure 2 shows the state
machine.
Selecting External Components
Input Power Supply
One reason the MAX1736 Li+ charger is so compact
and simple is that the charging current is set by the
external power source, not by the MAX1736. The P-
channel MOSFET in Figure 3
’
s application circuit is
either on or off, allowing the source to be directly con-
nected to the cell or disconnected. Therefore, it is
important to choose a power supply with the correct
current limit for the cell to be charged. In most applica-
tions, this will be a small wall cube with an open-circuit
output voltage of 5V to 12V, which is specified as
“
cur-
rent limited
”
or
“
constant current.
”
characteristics. For these wall cubes, output current
may exceed the specified current limit by several times
when the load is quickly connected. The MAX1736 lim-
its this current peak by controlling the slew rate of the
P-channel MOSFET. See
C
CT
and C
GATE
for more
information.
PMOS Switch
The P-channel MOSFET switches the current-limited
source on and off. Because of the intentionally slow
switching times and limited slew rate, the MAX1736 is
not particular about the power FET it drives. Spec-
ifications to consider when choosing an appropriate
M
SOT23, Single-Cell Li+ Battery Charger
for Current-Limited Supply
EN
IN
IN
GATE
IN
6mA
4.2V (4.1V)
5V
REF
GND
0.4V
1.4V
10
μ
A
CT
2
μ
A
350k
V
BATT
+ 100mV
STATE
MACHINE
BATT
MAX1736EUT42
(MAX1736EUT41)
Figure 1. Functional Diagram
相關PDF資料 |
PDF描述 |
|---|---|
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| MAX1737EVKIT | MAX1737 Evaluation Kit |
| MAX1737EEI | Stand-Alone Switch-Mode Lithium-Ion Battery-Charger Controller |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1736EUT-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 |
| MAX1737EEI | 功能描述:電池管理 Stand-Alone Switch-M L-Ion Battery Chargr 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 |
| MAX1737EEI+ | 功能描述:電池管理 Stand-Alone Switch-M L-Ion Battery Chargr 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 |
| MAX1737EEI+ | 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR ((NW)) |
| MAX1737EEI+T | 功能描述:電池管理 Stand-Alone Switch-M L-Ion Battery Chargr 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 |
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