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产品详情
主要特征
应用/用途
Parametric specs for Battery Chargers
Package/Pins | SSOP/20 |
Budgetary Price (See Notes) | 5.31 |
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简化框图
Technical Docs
数据资料 | 开关模式锂离子电池充电器 | Jul 24, 2019 | |
应用笔记 | New Developments in Battery Chargers | ||
设计指南 | New Developments in Battery Chargers | ||
参考原理图 | New Developments in Battery Chargers |
参量
Parametric specs for Battery Chargers
Package/Pins | SSOP/20 |
Budgetary Price (See Notes) | 5.31 |
主要特征
- Charges 1 to 4 Li+ Battery Cells
- ±0.75% Voltage-Regulation Accuracy Using 1% Resistors
- Provides up to 4A without Excessive Heating
- 90% Efficient
- Uses Low-Cost Set Resistors and N-Channel Switch
- Up to 24V Input
- Up to 18V Maximum Battery Voltage
- 300kHz Pulse-Width Modulated (PWM) Operation
- Low-Noise, Small Components
- Stand-Alone OperationNo Microcontroller Needed
应用/用途
- 蜂窝电话
- 台式摇篮架充电器
- 手持式仪表(PDA、掌上电脑)
- Li+电池组
- 笔记本电脑
描述
The MAX745 provides all functions necessary for charging lithium-ion (Li+) battery packs. It provides a regulated charging current of up to 4A without getting hot, and a regulated voltage with only ±0.75% total error at the battery terminals. It uses low-cost, 1% resistors to set the output voltage, and a low-cost N-channel MOSFET as the power switch.
The MAX745 regulates the voltage set point and charging current using two loops that work together to transition smoothly between voltage and current regulation. The per-cell battery voltage regulation limit is set between 4V and 4.4V using standard 1% resistors, and then the number of cells is set from 1 to 4 by pin-strapping. Total output voltage error is less than ±0.75%.
For a similar device with an SMBus™ microcontroller interface and the ability to charge NiCd and NiMH cells, refer to the MAX1647 and MAX1648. For a low-cost Li+ charger using a linear-regulator control scheme, refer to the MAX846A.
The MAX745 regulates the voltage set point and charging current using two loops that work together to transition smoothly between voltage and current regulation. The per-cell battery voltage regulation limit is set between 4V and 4.4V using standard 1% resistors, and then the number of cells is set from 1 to 4 by pin-strapping. Total output voltage error is less than ±0.75%.
For a similar device with an SMBus™ microcontroller interface and the ability to charge NiCd and NiMH cells, refer to the MAX1647 and MAX1648. For a low-cost Li+ charger using a linear-regulator control scheme, refer to the MAX846A.
Technical Docs
数据资料 | 开关模式锂离子电池充电器 | Jul 24, 2019 | |
应用笔记 | New Developments in Battery Chargers | ||
设计指南 | New Developments in Battery Chargers | ||
参考原理图 | New Developments in Battery Chargers |