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参数资料
| 型号： | MAX8731AETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | IC SMBUS LVL2 BATT CHRGR 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 多化学 |
| 电源电压： | 8 V ~ 26 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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SMBus Level 2 Battery Charger
with Remote Sense
? ( I CHARGE × V BATTERY ) ?
( V IN × η )
I INPUT = I LOAD + ? ? + I BIAS
? ?
? ?
where η is the efficiency of the DC-DC converter (typi-
cally 85% to 95%).
To set the input current limit, use the SMBus to write a
16-bit InputCurrent() command using the data format
listed in Table 3 . The InputCurrent() command uses the
Write-Word protocol (see Figure 3 ). The command
code for InputCurrent() is 0x3F (0b00111111). When
RS1 = 10m Ω , the MAX8731A provides an input-current-
limit range of 256mA to 11.004A, with 256mA resolu-
tion. InputCurrent() settings from 1mA to 256mA result
in a current limit of 256mA. Upon reset the input current
limit is 256mA.
Charger Timeout
The MAX8731A includes a timer to terminate charging
Remote Sense
The MAX8731A features dual remote sense, which
allows the rejection of board resistance and selector
resistance when used in either single- or dual-battery
systems. To fully utilize remote sensing, connect FBS_
directly to the battery interface through an unshared
battery sense trace in series with a 100 Ω resistor, and
10nF capacitor (see Figure 1). In single-battery systems,
connect BATSEL directly to GND and use only FBSA.
Remote sensing cancels the effect of impedance in
series with the battery. This impedance normally caus-
es the battery charger to prematurely enter constant-
voltage mode with reducing charge current. The result
is that the last 20% of charging takes longer than nec-
essary. When in constant-voltage mode, the remaining
charge time is proportional to the total resistance in
series with the battery. Remote sensing reduces
charge time according to the following equation:
if the charger does not receive a ChargeVoltage() or
ChargeCurrent() command within 175s. If a timeout
occurs, both ChargeVoltage() and ChargeCurrent()
t CVRS = t CV 0 ×
R Pack
R Pack + R Board
commands must be resent to reenable charging.
Table 3 . InputCurrent() (0x3F) (10m Ω Sense Resistor, RS1)
BIT
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
BIT NAME
—
—
—
—
—
—
—
Input Current, DACS 0
Input Current, DACS 1
Input Current, DACS 2
Input Current, DACS 3
Input Current, DACS 4
Input Current, DACS 5
—
—
—
DESCRIPTION
Not used. Normally a 2mA weight.
Not used. Normally a 4mA weight.
Not used. Normally an 8mA weight.
Not used. Normally a 16mA weight.
Not used. Normally a 32mA weight.
Not used. Normally a 64mA weight.
Not used. Normally a 128mA weight.
0 = Adds 0mA of input current compliance.
1 = Adds 256mA of input current compliance.
0 = Adds 0mA of input current compliance.
1 = Adds 512mA of input current compliance.
0 = Adds 0mA of input current compliance.
1 = Adds 1024mA of input current compliance.
0 = Adds 0mA of input current compliance.
1 = Adds 2048mA of input current compliance.
0 = Adds 0mA of input current compliance.
1 = Adds 4096mA of input current compliance.
0 = Adds 0mA of input current compliance.
1 = Adds 8192mA of input current compliance, 11,004mA max.
Not used. Normally a 16,384mA weight.
Not used. Normally a 32,768mA weight.
Not used. Normally a 65,536mA weight.
18
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相关代理商/技术参数 |
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|---|---|
| MAX8731AEVKIT+ | 功能描述:电源管理IC开发工具 MAX8731A 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 |
| MAX8731AEVSYS | 功能描述:电池管理 Evaluation System for the MAX8731A (includes an EVKit and the Maxim SMBUSMON2 board) 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 |
| MAX8731ETI+ | 制造商:Maxim Integrated Products 功能描述:CHGR MULTI-CHEM 8A 0V TO 19.2V 28TQFN - Rail/Tube |
| MAX8731ETI+T | 制造商:Maxim Integrated Products 功能描述:CHGR MULTI-CHEM 8A 0V TO 19.2V 28TQFN - Tape and Reel |
| MAX8731EVKIT | 功能描述:电池管理 SMBus Level 2 Battery Charger with Remote Sense 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 |
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