MAX846A

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


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说明

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.
MAX846A:典型工作电路 MAX846A:典型工作电路 放大+

关键特性

  • 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

  • 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

请查看具体的参数规格 Battery Chargers (74)


Part NumberLithium Ion CellsProtected VIN
(V)
Charging VIN
(V)
Charge Rate Set byMax. ICHG
(A)
Charge TerminationCharge RegulationOper. Temp.
(°C)
Package/PinsBudgetary
Price
maxmaxSee Notes
MAX846A 
1
2
2020Resistor2
Current Limit
Max. Voltage
Linear-40 to +85
QSOP/16
$3.49 @1k

Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。

MAX846AEVKIT: MAX846A评估板
产品可靠性报告: MAX846A.pdf 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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类型 编号 标题
评估板1553MAX846AEVKIT MAX846A评估板