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參數(shù)資料
| 型號(hào)： | MAX1736 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 數(shù)字信號(hào)處理 |
| 英文描述： | Replaced by TMS320VC5506 : Digital Signal Processor 132-BQFP -40 to 85 |
| 中文描述： | SOT23封裝、單節(jié)Li+電池充電器，配合限流型電源使用 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 179K |
| 代理商： | MAX1736 |
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.
”
Some low-cost wall cubes may have poor transient
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(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1736EUT41-T | SOT23, Single-Cell Li+ Battery Charger for Current-Limited Supply |
| MAX1736EUT42-T | SOT23, Single-Cell Li+ Battery Charger for Current-Limited Supply |
| MAX1737 | Replaced by TMS320VC5506 : Digital Signal Processor 132-BQFP |
| MAX1737EVKIT | MAX1737 Evaluation Kit |
| MAX1737EEI | Stand-Alone Switch-Mode Lithium-Ion Battery-Charger Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1736ETT42+T | 功能描述:電池管理 1Cell Li+ Battery Charger 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 |
| MAX1736EUT | 制造商:Maxim Integrated Products 功能描述:SOT23 SINGLE-CELL LI+ BATTERY CHAR - Rail/Tube |
| 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 |
| MAX1736EUT41 | 制造商:Maxim Integrated Products 功能描述:SOT23 SINGLE-CELL LI+ BATTERY CHAR - Cut Tape Product |
| MAX1736EUT41+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 |
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