MAX846A
Cost-Saving, Multichemistry, Battery Charger System
Universal Charger with Low-Cost µC or Stand-Alone Li+ Charger
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Overview
Features and Benefits
- 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
Product Details
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.
Applications
- Cell Phones
- Desktop Cradle Chargers
- Handheld Instruments (PDAs, Palmtops)
- Li+ Battery Packs
- Li+-Ion/NiMH/NiCd Multichemistry Battery Chargers
- Notebook Computers
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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MAX846A Reliability Data1/12/2023PDF26K
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New Developments in Battery Chargers3/15/2000
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
PCN-PDN Information
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Lead Times
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