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低成本、多种化学类型电池充电控制器

通用充电器,具有低成本µC或独立式Li+电池充电器

产品详情

主要特征

应用/用途

Parametric specs for Battery Chargers
Charging VIN (V) (max) 20
Max. ICHG (A) 2
Cell Chemistry Li-Ion
Li-Polymer
NiCd
NiMH
# NiMH/ NiCd Cells 1
2
3
4
5
6
7
8
9
10
11
# Lithium Ion Cells 1
2
Protected VIN (V) (max) 20
Charger (V) 18
Oper. Temp. (°C) -40 to +85
Package/Pins QSOP/16
Budgetary
Price (See Notes)
3.49
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参量

Parametric specs for Battery Chargers
Charging VIN (V) (max) 20
Max. ICHG (A) 2
Cell Chemistry Li-Ion
Li-Polymer
NiCd
NiMH
# NiMH/ NiCd Cells 1
2
3
4
5
6
7
8
9
10
11
# Lithium Ion Cells 1
2
Protected VIN (V) (max) 20
Charger (V) 18
Oper. Temp. (°C) -40 to +85
Package/Pins QSOP/16
Budgetary
Price (See Notes)
3.49

主要特征

  • Multichemistry Charger System (Li-Ion, NiMH, NiCd)
  • Independent Voltage and Current Loops
  • ±0.5% Internal Reference for Li-Ion Cells
  • Lowers Cost:
    • Stands Alone or Uses Low-Cost µC
    • Built-In 1% Linear Regulator Powers µC
    • Linear Regulator Provides Reference to µC ADCs
    • Built-In µC Reset
    • Controls Low-Cost External PNP Transistor or P-Channel MOSFET
  • Space-Saving 16-Pin QSOP
  • Charging-Current-Monitor Output
  • < 1µA Battery Drain when Off

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
  • Li+/NiMH/NiCd多化学类型电池充电器
  • 笔记本电脑

描述

The MAX846A is a cost-saving multichemistry battery-charger system that comes in a space-saving 16-pin QSOP. This integrated system allows different battery chemistries (Li-Ion, NiMH or NiCd cells) to be charged using one circuit.

In its simplest application, the MAX846A is a stand-alone, current-limited float voltage source that charges Li-Ion cells. It can also be paired up with a low-cost microcontroller (µC) to build a universal charger capable of charging Li-Ion, NiMH, and NiCd cells.

An internal 0.5%-accurate reference allows safe charging of Li-Ion cells that require tight voltage accuracy. The voltage- and current-regulation loops used to control a low-cost external PNP transistor (or P-channel MOSFET) are independent of each other, allowing more flexibility in the charging algorithms.

The MAX846A has a built-in 1%, 3.3V, 20mA linear regulator capable of powering the µC and providing a reference for the µC's analog-to-digital converters. An on-board reset notifies the controller upon any unexpected loss of power. The µC can be inexpensive, since its only functions are to monitor the voltage and current and to change the charging algorithms.

简化框图

MAX846A:典型工作电路 MAX846A:典型工作电路 Zoom icon

支持和培训

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