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参数资料
| 型号： | MAX1894 |
| 厂商： | Maxim Integrated Products, Inc. |
| 元件分类： | 数字信号处理 |
| 英文描述： | Fixed-Point Digital Signal Processor 256-BGA |
| 中文描述： | 高级Li+电池组保护器 |
| 文件页数： | 11/16页 |
| 文件大小： | 308K |
| 代理商： | MAX1894 |
M
Advanced Li+ Battery-Pack Protectors
______________________________________________________________________________________
11
Set the nominal values of the trickle charge current by
selecting resistor R
TKO
based on the following equation:
R
TKO
= (V
CHRG
- VP
ACK
)/I
TKO
where V
CHRG
is the charger output voltage, V
PACK
is
the battery-pack voltage, and I
TKO
is the trickle-charge
current.
When the trickle-charge option is not used, float
CGO
and connect
TKO
to the gate of the overcharge protec-
tion MOSFET (see Figure 9). When a charger is applied
and the voltage on one or more cells is less than
V
UV_TH
, the MAX1894/MAX1924 modulate the
TKO
out-
put until all cells exceed V
UV_TH
.
Protection FET Drivers
All three external MOSFETs have their source pins con-
nected to the SRC pin. When a MOSFET is turned off, FET
drivers pull the gate to the SRC voltage. Additional exter-
nal pullup resistors are not needed. When the MOSFET is
turned on, the V
GS
is limited to -14V by a clamp circuit
built in the drivers. This allows use of MOSFETs with maxi-
mum V
GS
of -20V. All three drivers have the same circuit-
ry and drive capability. The quiescent current in normal
operation is less than 3μA per driver.
R
SENSE
Selection
All current faults are detected using a current-sense
resistor connected between BN and PKN. The value of
this resistor sets the fault current levels. Charge-current
fault is given by:
Discharge-current fault is given by:
Pack-short current fault is given by:
Select R
SENSE
to obtain the desired fault current levels.
For example, a 20m
R
SENSE
sets the charge current
fault at 5A. Choose an R
SENSE
that can withstand the
dissipation during normal operation and current fault
conditions. For example, pack-short current is given by:
I
V
R
mV
R
PS TH
_
PS TH
_
SENSE
SENSE
=
=
405
I
V
R
mV
R
OD TH
_
OC TH
_
SENSE
SENSE
=
=
145
I
V
R
mV
R
OC_
OC TH
_
SENSE
SENSE
=
=
100
Figure 5. Charge-Current Fault
NORMAL OPERATION
V
B4P
> V
SRC
+ 0.1V
NO
YES
TKO, CGO = H
OC FAULT
V
RSENSE
< V
OC_TH
FOR 3ms
NO
YES
Figure 6. Discharge-Current Fault
NORMAL OPERATION
V
SRC
> V
B4P
+ 0.1V
NO
YES
DSO, TKO, CGO = H
OD FAULT
V
RSENSE
> V
OD_TH
FOR 3ms
NO
YES
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1894-MAX1924 | Fixed-Point Digital Signal Processor 288-FCBGA |
| MAX1925 | Fixed-Point Digital Signal Processor 548-FCBGA |
| MAX1926 | Switch-Mode 1-Cell Li+ Chargers |
| MAX1926ETC | Switch-Mode 1-Cell Li+ Chargers |
| MAX1925ETC | Switch-Mode 1-Cell Li+ Chargers |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1894EVKIT | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX1894XEEE | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1894XEEE-T | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1895EGI | 功能描述:显示驱动器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX1895EGI-T | 功能描述:显示驱动器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
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