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参数资料
| 型号： | MAX17049G+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/19页 |
| 文件大小： | 0K |
| 描述： | IC FUEL/GAS GAUGE LI-ION 8TDFN |
| 标准包装： | 1 |
| 系列： | ModelGauge™ |
| 功能： | 燃料，电量检测计/监控器 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 2.5 V ~ 4.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（2x2） |
| 包装： | 管件 |
MAX17048/MAX17049
Micropower 1-Cell/2-Cell Li+ ModelGauge ICs
Temperature Compensation
For best performance, the host microcontroller must
measure battery temperature periodically, and compen-
sate the RCOMP ModelGauge parameter accordingly, at
least once per minute. Each custom model defines con-
stants RCOMP0 (default is 0x97), TempCoUp (default is
-0.5), and TempCoDown (default is -5.0). To calculate the
new value of CONFIG.RCOMP:
// T is battery temperature (degrees Celsius)
if (T > 20) {
RCOMP = RCOMP0 + (T - 20) x TempCoUp;
}
else {
RCOMP = RCOMP0 + (T - 20) x TempCoDown;
}
Impact of Empty-Voltage Selection
Most applications have a minimum operating voltage
below which the system immediately powers off (empty
voltage). When characterizing the battery to create a cus-
tom model, choose empty voltage carefully. As shown in
Figure 4, capacity unavailable to the system increases at
an accelerating rate as empty voltage increases.
To ensure a controlled shutdown, consider including
operating margin into the fuel gauge based on some low
threshold of SOC, for example shutting down at 3% or
5%. This utilizes the battery more effectively than adding
error margin to empty voltage.
Battery Insertion
When the battery is first inserted into the system, the
fuel-gauge IC has no previous knowledge about the bat-
tery’s SOC. Assuming that the battery is relaxed, the IC
60
50
40
30
20
C/3 LOAD
translates its first V CELL measurement into the best initial
estimate of SOC. Initial error caused by the battery not
being in a relaxed state diminishes over time, regardless
of loading following this initial conversion. While SOC
estimated by a coulomb counter diverges, ModelGauge
SOC converges, correcting error automatically as illus-
trated in Figure 5; initial error has no long-lasting impact.
Battery Insertion Debounce
Any time the IC powers on or resets (see the
10
0
3.0
C/10 LOAD
3.1 3.2 3.3 3.4 3.5
TARGET EMPTY VOLTAGE (V)
VRESET/ID Register (0x18) section), it estimates that
OCV is the maximum of 16 V CELL samples (1ms each, full
12-bit resolution). OCV is ready 17ms after battery inser-
tion, and SOC is ready 175ms after that.
Figure 4. Increasing Empty Voltage Reduces Battery Capacity
LONGER BATTERY RELAXATION
IMPROVES INITIAL ACCURACY
MODELGAUGE HEALS ERROR
AUTOMATICALLY OVER TIME
45
RELAXED ERROR
UNRELAXED ERROR
SOC ERROR
0
0
0
30
R EFERENCE SO C
RELAXED SOC
-10
VOLTAGE ERROR
-5
-5
15
-20
-10
-10
UNRELAXED SOC
0
0.1
1
10
100
1000
0
20
40
60
80
RELAXATION TIME BEFORE INSERTION (MINUTES)
Figure 5. ModelGauge Heals Error Automatically
Maxim Integrated
TIME AFTER INSERTION (MINUTES)
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17049G+ | 功能描述:电池管理 Host-Side Modelgauge (2-Cell) 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 |
| MAX17049G+T10 | 功能描述:电池管理 Host-Side Modelgauge (2-Cell) 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 |
| MAX17049X+ | 功能描述:电池管理 Host-Side Modelgauge (2-Cell) WLCSP 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 |
| MAX17049X+T10 | 功能描述:电池管理 Host-Side Modelgauge (2-Cell) WLCSP 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 |
| MAX17050EVKIT# | 功能描述:电源管理IC开发工具 MAX17050 Eval Kit 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 |
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