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| 型号： | MAX8730ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/29页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATTERY 28-TQFN |
| 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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Low-Cost Battery Charger
k OFF 2 ? 1 1 ?
8 x L x V RIPPLE SRC BATT BATT ? ?
C OUT > x ? +
R 15 =
? R 10
Output Capacitor Selection
The output capacitor absorbs the inductor ripple cur-
rent and must tolerate the surge current delivered from
the battery when it is initially plugged into the charger.
As such, both capacitance and ESR are important
parameters in specifying the output capacitor as a filter
and to ensure stability of the DC-DC converter (see the
Compensation section). Beyond the stability require-
ments, it is often sufficient to make sure that the output
capacitor’s ESR is much lower than the battery’s ESR.
Either tantalum or ceramic capacitors can be used on
the output. Ceramic devices are preferable because of
their good voltage ratings and resilience to surge cur-
rents. For a ceramic output capacitor, select the capac-
itance according to the following equation:
? V ? V V
The output ripple requirement of a charger is typically
only constrained by the overvoltage protection circuitry
of the battery protector and the overvoltage protection
of the charger. For proper operation, ensure that the
ripple is smaller than the overvoltage protection thresh-
old of both the charger and the battery protector. If the
protector’s overvoltage protection is filtered, the battery
protector may not be a constraint.
Applications Information
Adapter Soft-Start
The adapter selection MOSFETs may be soft-started to
reduce adapter surge current upon adapter selection.
Figure 10 shows the adapter soft-start application using
Miller capacitance for optimum soft-start timing and
power dissipation.
System Short-Circuit IINP Configuration
The MAX8730 has a system short-circuit protection fea-
ture. When V IINP is greater than 4.2V, the MAX8730
latches off PDS. PDS remains off until the adapter is
removed and reinserted. For fast response to system
overcurrent, add an RC (C13 and R15), as shown in
Figure 11.
Select R15 according to the following equation:
V SST
G IINP x RS 1 x I SST x 0 . 7
where:
V SST = 4.2V.
I SST = Short-circuit system current threshold. Since sys-
tem short-circuit triggers a latch, it is important to choose
I SST high enough to prevent unintentional triggers.
Select C13 according to the following equation:
SYSTEM
C 13 =
t Delay
R 15
ADAPTER
C SS1
32nF
R SS2
6k ?
LOAD
C SS2
10nF
IINP
R15
SRC
PDS
R SS1
18k ?
MAX8730
C13
C6
R10
Figure 10. Adapter Soft-Start Modification
Figure 11. System Short-Circuit IINP Configuration
26
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8730EVKIT | 制造商:Maxim Integrated Products 功能描述:LOW COST BATTERY CHARGER - Rail/Tube |
| MAX8731AETI+ | 功能描述:电池管理 SMBus Level 2 Battery Charger 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 |
| MAX8731AETI+T | 功能描述:电池管理 SMBus Level 2 Battery Charger 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 |
| 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 |
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