MAX1772
Low-Cost, Multichemistry Battery-Charger Building Block
0.7% Accurate, Input-Current-Limited, Multichemistry Battery Charger Offers Most Complete Solution
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Key Features
Applications/Uses
| Charging VIN (V) (max) | 28 |
| Max. ICHG (A) | 4 |
| Cell Chemistry | Lead Acid Li-Ion Li-Polymer NiCd NiMH Universal |
| # NiMH/ NiCd Cells | 2 3 4 5 6 7 8 9 10 |
| # Lithium Ion Cells | 2 3 4 |
| Protected VIN (V) (max) | 28 |
| Charger (V) | 0 to 18.2 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | QSOP/28 |
| Budgetary Price (See Notes) | 7.4 |
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) | 28 |
| Max. ICHG (A) | 4 |
| Cell Chemistry | Lead Acid Li-Ion Li-Polymer NiCd NiMH Universal |
| # NiMH/ NiCd Cells | 2 3 4 5 6 7 8 9 10 |
| # Lithium Ion Cells | 2 3 4 |
| Protected VIN (V) (max) | 28 |
| Charger (V) | 0 to 18.2 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | QSOP/28 |
| Budgetary Price (See Notes) | 7.4 |
Key Features
- Input Current Limiting
- ±0.5% Output Voltage Accuracy Using Internal Reference (0°C to +85°C)
- Programmable Battery Charge Current >4A
- Analog Inputs Control Charge Current and Charge Voltage
- Monitor Outputs for:
- Current Drawn from AC Input Source
- Charging Current
- AC Adapter Present
- Up to 18.2V (max) Battery Voltage
- 8V to 28V Input Voltage
- >95% Efficiency
- 99.99% (max) Duty Cycle for Low-Dropout Operation
- Charges Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.
Applications/Uses
- Handheld Terminals
- Notebook and Subnotebook Computers
- PDAs and Other Handheld Devices
Description
Maximum current drawn from the AC adapter is programmable to avoid overloading the AC adapter when supplying the load and the battery charger simultaneously. This enables the user to reduce the cost of the AC adapter. The MAX1772 provides outputs that can be used to monitor the current drawn from the AC adapter, battery-charging current, and the presence of an AC adapter.
The MAX1772 can charge two to four lithium-ion (Li+) series cells, easily providing 4A. When charging, the MAX1772 automatically transitions from regulating current to regulating voltage. It is available in a space-saving 28-pin QSOP package.
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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