MAX745 - 开关模式锂离子电池充电器

MAX745是Maxim美信半导体公司的一款电池管理产品，MAX745是开关模式锂离子电池充电器，本站介绍了MAX745的封装应用图解、特点和优点、功能等，并给出了与MAX745相关的Maxim元器件型号供参考。

MAX745 - 开关模式锂离子电池充电器 - 电池管理 - 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 - 美信半导体

产品概述

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.

关键特性

以下关键特性由Maxim美信半导体提供：

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

热门应用

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

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