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参数资料
| 型号： | MAX8731AETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 25/32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
C OUT is also much lower impedance than R L near
crossover so the parallel impedance is mostly capaci-
tive and:
GM OUT = 5A/V
C OUT = 2 x 10μF
F OSC = 400kHz
R L ?
( 1 + sC OUT × R L )
?
1
sC OUT
R L = 0.2 Ω
F CO_CV = 50kHz
If R ESR is small enough, its associated output zero has
a negligible effect near crossover and the loop-transfer
function can be simplified as follows:
To ensure that the compensation zero adequately can-
cels the output pole, select f Z_CV ≤ f P_OUT :
C CV ≥ (R L / R CV ) C OUT
LTF = GM OUT ×
R CV
sC OUT
G MV
C CV ≥ 400pF (assuming 2 cells and 2A maximum
Setting LTF = 1 to solve for the unity-gain frequency
yields:
charge current.)
Figure 8 shows the Bode plot of the voltage-loop fre-
quency response using the values calculated above.
f CO _ CV = GM OUT × G MV ×
R CV
2 π × C OUT
CCI Loop Compensation
The simplified schematic in Figure 9 is sufficient to
describe the operation of the MAX8731A when the bat-
For stability, choose a crossover frequency lower than
1/10 the switching frequency. For example, choose a
crossover frequency of 50kHz and solve for R VC using
the component values listed in Figure 1 to yield R CV =
10k Ω :
tery current loop (CCI) is in control. Since the output
capacitor’s impedance has little effect on the response
of the current loop, only a simple single pole is required
to compensate this loop. A CSI is the internal gain of the
current-sense amplifier. RS2 is the charge current-
sense resistor (10m Ω ). R OGMI is the equivalent output
R CV =
2 π × C OUT × f CO _ CV
GMV × GM OUT
? 10 k Ω
impedance of the GMI amplifier, which is greater than
10M Ω . GMI is the charge-current amplifier transcon-
ductance = 1μA/mV. GM OUT is the DC-DC converter
GMV = 0.125μA/mV
80
0
transconductance = 5A/V.
CSIP
CSIN
60
40
-45
GM OUT
RS2
CSI
20
0
-90
CCI
-20
MAG
PHASE
GMI
-40
-135
C CI
R OGMI
0.1
1
10
100 1k
FREQUENCY (Hz)
10k
100k
1M
ChargeCurrent( )
Figure 8 . CCV Loop Response
Figure 9 . CCI Loop Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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