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M
Lithium-Ion Battery Pack Protector
8
_______________________________________________________________________________________
Applications Information
Choosing an External MOSFET
The external N-channel MOSFETs act as gated switch-
es to enable or disable the charging/discharging
process. CHG and DSG control the gate of these exter-
nal MOSFETs to prevent damage to the
Li+
cells. For
overcurrent conditions, the voltage at DSG equals the
voltage at BN, thereby reducing all current flow, includ-
ing the path through the body diode of the
N-channel MOSFET. Note that the MAX1665X clamps
the V
GS
voltage to a maximum of 20V.
The IRF7101 is a low-cost, dual N-channel MOSFET
that is available in a small 8-pin SO package.
Depending on the maximum charge and discharge
rates, use different MOSFETs to optimize each applica-
tion. Table 3 summarizes recommended MOSFETs.
2, 3, and 4-Cell Applications
Figures 3 through 5 depict circuits for 2, 3, and 4-cell
applications. Note that the two series MOSFETs (IRF7101
dual N-channel MOSFETs) are oriented to prevent body
diode current flow. The indicated polarity symbols show
the connection for the external source required to charge
the
Li+
cells. This external charger source also supplies
the gate drive to the MOSFETs through pack + voltage /
pack.
DUAL N-CHANNEL
MOSFETs
IRF9956
FDS6990A
Si9936
0.050
0.018
0.10
TYPICAL
R
DS(ON)
(
)
±20
±20
±20
MAX V
GS
(V)
Table 3. Recommended MOSFETs
R
R
R
V
4
R
V
3
R
V
2
R
V
1
R
V
4
R
+
V
2
R
+
V
1
+
V
1
+
V
2
+
V
3
+
V
4
+
V
3
+
V
4
I
4
I
3P
I
2P
I
1P
I
1
I
2
I
3
I
CB
B3P1
B1P1
B2P1
BP4
BP3
BP2
BP1
V
4
R
I
CB
V
4
R
I
CB
Figure 2. Sampling Mode Equivalent Circuit
MAX1665S
DSG
BN
B1P
B2P
I.C.
I.C.
PACK-
OVERCHARGE
PROTECTION
OVERDISCHARGE
PROTECTION
CELL 1
IRF7101
IRF7101
CELL 2
PACK+
CHG
PKN
2
5
6
7
8
1
3
4
Figure 3. Typical 2-Cell Operating Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1665X | Lithium-Ion Battery Pack Protector |
| MAX1665XESA | Lithium-Ion Battery Pack Protector |
| MAX1665VESA | Lithium-Ion Battery Pack Protector |
| MAX1665SESA | Lithium-Ion Battery Pack Protector |
| MAX1668-MAX1989 | Multichannel Remote/Local Temperature Sensors |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1665VESA+ | 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 |
| MAX1665VESA+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 |
| MAX1665XESA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1666AEEP | 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 |
| MAX1666AEEP+ | 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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