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参数资料
| 型号： | MAX17049G+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/19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
Detailed Description
ModelGauge Theory of Operation
The MAX17048/MAX17049 ICs simulate the internal,
nonlinear dynamics of a Li+ battery to determine its SOC.
The sophisticated battery model considers impedance
and the slow rate of chemical reactions in the battery
(Figure 2).
ModelGauge performs best with a custom model,
obtained by characterizing the battery at multiple dis-
charge currents and temperatures to precisely model it.
At power-on reset (POR), the ICs have a preloaded ROM
model that performs well for some batteries. Contact
Maxim if you need a custom model.
Fuel-Gauge Performance
In coulomb counter-based fuel gauges, SOC drifts
because offset error in the current-sense ADC measure-
ment accumulates over time. Instantaneous error can be
very small, but never precisely zero. Error accumulates
over time in such systems (typically 0.5%–2% per day)
and requires periodic corrections. Some algorithms cor-
rect drift using occasional events, and until such an event
occurs the algorithm’s error is boundless:
? Reaching predefined SOC levels near full or empty
? Measuring the relaxed battery voltage after a long
period of inactivity
? Completing a full charge/discharge cycle
ModelGauge requires no correction events because it uses
only voltage, which is stable over time. As TOCs 8, 9, and 10
show, ModelGauge remains accurate despite the absence
of any of the above events; it neither drifts nor accumulates
error over time.
To correctly measure performance of a fuel gauge as
experienced by end-users, exercise the battery dynami-
cally. Accuracy cannot be fully determined from only
simple cycles.
Battery Voltage and State-Of-Charge
Open-circuit voltage (OCV) of a Li+ battery uniquely
determines its SOC; one SOC can have only one value of
OCV. In contrast, a given V CELL can occur at many dif-
ferent values of OCV because V CELL is a function of time,
OCV, load, temperature, age, and impedance, etc.; one
value of OCV can have many values of V CELL . Therefore,
one SOC can have many values of V CELL , so V CELL can-
not uniquely determine SOC.
Figure 3 shows that V CELL = 3.81V occurs at 2%, 50%,
and 72% SOC.
Even the use of sophisticated tables to consider both
voltage and load results in significant error due to the
load transients typically experienced in a system. During
charging or discharging, and for approximately 30min
after, V CELL and OCV differ substantially, and V CELL has
been affected by the preceding hours of battery activity.
ModelGauge uses voltage comprehensively.
V DD
BIAS
VOLTAGE
MAX17048
MAX17049
TIME BASE
(32kHz)
100%
V CELL
3.81V = 2%
3.81V
3.81V = 72%
4.2V
4.0V
3.8V
3.6V
3.4V
REFERENCE
ADC (V CELL )
STATE
MACHINE
(SOC, RATE)
CTG
QSTRT
ALRT
80%
60%
40%
3.81V = 50%
SOC
3.2V
CELL
GND
IC
GROUND
2-WIRE
INTERFACE
SDA
SCL
20%
0%
0
1
2
3
4
5
6
7
8
TIME (HOURS)
Figure 2. Block Diagram
Maxim Integrated
Figure 3. Instantaneous Voltage Does Not Translate Directly to
SOC
7
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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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