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参数资料
| 型号： | MAX1909ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/30页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATTERY 28-TQFN |
| 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 ~ 28 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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Multichemistry Battery Chargers with Automatic
System Power Selector
f CO _ CV = GM OUT × GMV ? ?
? 2 π × C OUT ?
The poles and zeros of the voltage-loop transfer function
are listed from lowest frequency to highest frequency in
Table 1.
Near crossover, C CV has a much lower impedance
than R OGMV . Since C CV is in parallel with R OGMV, C CV
dominates the parallel impedance near crossover.
Additionally, R CV has a much higher impedance than
C CV and dominates the series combination of R CV and
C CV , so:
Setting the LTF = 1 to solve for the unity-gain frequency
yields:
R CV ?
?
For stability, choose a crossover frequency lower than
1/10th of the switching frequency. Choosing a
crossover frequency of 30kHz and solving for R CV
R OGMV × ( 1 + sC CV × R CV )
( 1 + sC CV × R OGMV )
? R CV
using the component values listed in Figure 1 yields:
MODE = LDO (4 cells)
GMV = 0.125μA/mV
C OUT also has a much lower impedance than R L near
crossover, so the parallel impedance is mostly capaci-
tive and:
C OUT = 22μF
V BATT = 16.8V
R L = 0.2 Ω
R L
( 1 + sC OUT × R L )
?
1
sC OUT
GM OUT = 3.33A/V
f CO_CV = 30kHz
f OSC = 400kHz
If R ESR is small enough, its associated output zero has
LTF = GM OUT ×
R CV
R CV =
2 π × C OUT × f CO _ CV
GMV × GM OUT
a negligible effect near crossover and the loop-transfer
function can be simplified as follows:
GMV
sC OUT
= 10 k Ω
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
where C CV ≥ 4nF (assuming 4 cells and 4A maximum
charge current).
Figure 6 shows the Bode plot of the voltage-loop fre-
quency response using the values calculated above.
CCI Loop Compensation
80
60
40
20
0
-20
-40
MAG
PHASE
0
-45
-90
-135
The simplified schematic in Figure 7 is sufficient to
describe the operation of the MAX1909/MAX8725 when
the battery current loop (CCI) is in control. Since the
output capacitor’s impedance has little effect on the
response of the current loop, only a 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, RS2 = 15m Ω . R OGMI is the
equivalent output impedance of the GMI amplifier,
which is greater than 10M Ω . GMI is the charge-current
amplifier transconductance = 1μA/mV. GM OUT is the
DC-DC converter transconductance = 3.3A/V.
The loop transfer function is given by:
0.1
1
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
Figure 6. CCV Loop Response
LTF = GM OUT × A CSI × RS 2 × GMI
R OGMI
1 + sR OGMI × C CI
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1909EVKIT | 功能描述:电池管理 Evaluation Kit for the MAX1909 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 |
| MAX190ACNG | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX190ACNG+ | 功能描述:模数转换器 - ADC 12Bit 75ksps 5V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX190ACWG | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX190ACWG+ | 功能描述:模数转换器 - ADC 12Bit 75ksps 5V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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