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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

产品详情

主要特征

Parametric specs for Battery Chargers
Charging VIN (V) (max) 24
Max. ICHG (A) 4
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
2
3
4
Protected VIN (V) (max) 24
Charger (V) 18
Oper. Temp. (°C) -40 to +85
Package/Pins SSOP/20
Budgetary
Price (See Notes)
5.63
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参量

Parametric specs for Battery Chargers
Charging VIN (V) (max) 24
Max. ICHG (A) 4
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
2
3
4
Protected VIN (V) (max) 24
Charger (V) 18
Oper. Temp. (°C) -40 to +85
Package/Pins SSOP/20
Budgetary
Price (See Notes)
5.63

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 Operation—No 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.

简化框图

MAX745:典型工作电路 MAX745:典型工作电路 Zoom icon

Technical Docs

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在Maxim的知识库中搜索技术问题的答案

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Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心