MAX846A
Cost-Saving, Multichemistry, Battery Charger System
Universal Charger with Low-Cost µC or Stand-Alone Li+ Charger
MyMaxim SubscriptionsProduct Details
Key Features
Applications/Uses
| 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) | 3.96 |
Simplified Block Diagram
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact [email protected] with any questions regarding this Sample Site.
Parameters
| 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) | 3.96 |
Key Features
- 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
Applications/Uses
- Cell Phones
- Desktop Cradle Chargers
- Handheld Instruments (PDAs, Palmtops)
- Li+ Battery Packs
- Li+-Ion/NiMH/NiCd Multichemistry Battery Chargers
- Notebook Computers
Description
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.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact [email protected] with any questions regarding this Sample Site.
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