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参数资料
| 型号： | MAX1538ETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/22页 |
| 文件大小： | 0K |
| 描述： | IC PWR SOURCE SELECTOR 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 功能： | 双电池控制器 |
| 电池化学： | 所有电池类型 |
| 电源电压： | 4.75 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： | 托盘 |
Power-Source Selector for
Dual-Battery Systems
OTHER POWER SOURCE
5 x V MINV OR AC/AIR THRESHOLD
EXTLD
MAX1538
V SYS_MIN
C SOURCE
t MINV OR t ADP
t OFF
I SOURCE
PARASITIC
ADPBLK/REVBLK
t TRANS
t ON
INDUCTANCE
(L SOURCE )
REVBLK/ADPBLK
TO BATTERY
OR ADAPTER
Figure 8. System Holdup Capacitor Timing
crash, and C SYS is the total system holdup capaci-
tance, which does not need to be near the MAX1538.
The timing related to the system holdup capacitance is
shown in Figure 8.
Charger output capacitance contributes to C SYS for the
step-down charger topology (Figure 1), but not for the
step-up/step-down charger topology (Figure 2).
Leakage Current into BAT_
Leakage current into BATA or BATB can interfere with
proper battery-removal detection. D1 and D2 must be
Figure 9. Inductive Kick Upon Source Disconnect
Inductive “Kick”
When the adapter or a battery is delivering a significant
current to the system and that path is disabled (typical-
ly to enable another path), a voltage spike is generated
at the source. This is due to a parasitic inductance
shown in Figure 9. When the adapter is disconnected, a
positive voltage spike occurs at ADPIN. When a dis-
charging battery is disconnected, a positive voltage
spike occurs at BAT_. Connect a capacitor from BAT_
or ADPIN to GND to limit this inductive kick. Choose the
source capacitance according to the following equation:
30 2 ? V SOURCE
low leakage to ensure that battery removal is properly
detected. Choose MOSFETs P6 and P7 with low off-
leakage current. Board leakage current can also be a
problem. For example, neighbor pins BATA and
C SOURCE >
L SOURCE × I SYS _ MAX
2
2
BATSUP should have greater than 50M ? impedance
between each other. Proper battery-removal detection
requires that:
I Board + I DS _ OFF ( P 6 ) + I DS _ OFF ( P 7 ) + I D 1 _ leakage +
I D 2 _ leakage < I BAT _ Sink @ 2 V
where I Board is board leakage current, I DS_OFF is the
off-leakage current of MOSFETs P6 and P7, I D_Leakage
where V SOURCE is the maximum DC voltage of the
source in question, I SYS_MAX is the maximum system
load, and L SOURCE (parasitic inductance) and
C SOURCE are shown in Figure 9.
During battery charge, the voltage spike during battery
disconnect is negative. To ensure that this negative
voltage spike does not go below 0V, choose C BAT_
according to the following equation:
is the reverse leakage current of the diodes, and
I BAT_Sink@2V is the BAT_ leakage current at 2V (0.4μA;
see the Typical Operating Characteristics ).
C BAT _ >
L BAT _ × I CHG _ MAX
2
V BAT _ _ MIN
2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1538ETI+ | 功能描述:电池管理 Power-Source Select for Dual-Bat System 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 |
| MAX1538ETI+T | 功能描述:电池管理 Power-Source Select for Dual-Bat System 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 |
| MAX1538ETI-T | 功能描述:电池管理 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 |
| MAX1538EVKIT | 功能描述:电源管理IC开发工具 MAX1538EVKIT 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 |
| MAX153C/D | 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 |
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