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MAX745：开关模式锂离子电池充电器

精度高达±0.75%的Li+电池充电器，提供4A充电电流时不会出现发热现象

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.

关键特性 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 Operation—No Microcontroller Needed

功能框图 产品应用 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

关键参数

数据手册DataSheet

开发工具

• MAX745EVKIT

技术资料

• Portable Devices Need High-Performance Battery Chargers
• How to Design Battery Charger Applications that Require External Microcontrollers and Related System-Level Issues
• New Developments in Battery Chargers

质量和环境数据

• MAX745.pdf

订购型号