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MAX1645B
Advanced Chemistry-Independent, Level 2 Battery Charger with Input Current Limiting
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Key Features
Applications/Uses
Parametric specs for Battery Chargers
| Package/Pins | QSOP/28 |
| Budgetary Price (See Notes) | 0 |
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Simplified Block Diagram
Technical Docs
| Data Sheet | Advanced Chemistry-Independent, Level 2 Battery Charger with Input Current Limiting | Nov 14, 2006 |
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 .
Parameters
Parametric specs for Battery Chargers
| Package/Pins | QSOP/28 |
| Budgetary Price (See Notes) | 0 |
Key Features
- Input Current Limiting
- 175s Charge Safety Timeout
- 128mA Wake-Up Charge
- Charges Any Chemistry Battery: Li+, NiCd, NiMH, Lead Acid, etc.
- Intel SMBus 2-Wire Serial Interface
- Compliant with Level 2 Smart Battery Charger Spec Rev 1.0
- +8V to +28V Input Voltage Range
- Up to 18.4V Battery Voltage
- 11-Bit Battery Voltage Setting
- ±0.8% Output Voltage Accuracy with Internal Reference
- 3A (max) Battery Charge Current
- 6-Bit Charge-Current Setting
- 99.99% (max) Duty Cycle for Low-Dropout Operation
- Load/Source Switchover Drivers
- >97% Efficiency
Applications/Uses
- Notebook Computers
- Personal Digital Assistants
- Point-of-Sale Terminals
Description
The MAX1645B is a high-efficiency battery charger capable of charging batteries of any chemistry type. It uses the Intel System Management Bus (SMBus) to control voltage and current-charge outputs.
When charging lithium-ion (Li+) batteries, the MAX1645B automatically transitions from regulating current to regulating voltage. The MAX1645B can also limit line input current so as not to exceed a predetermined current drawn from the DC source. A 175s charge safety timer prevents "runaway charging" should the MAX1645B stop receiving charging voltage/current commands.
The MAX1645B employs a next-generation synchronous buck control circuitry that lowers the minimum input-to-output voltage drop by allowing the duty cycle to exceed 99%. The MAX1645B can easily charge one to four series Li+ cells.
When charging lithium-ion (Li+) batteries, the MAX1645B automatically transitions from regulating current to regulating voltage. The MAX1645B can also limit line input current so as not to exceed a predetermined current drawn from the DC source. A 175s charge safety timer prevents "runaway charging" should the MAX1645B stop receiving charging voltage/current commands.
The MAX1645B employs a next-generation synchronous buck control circuitry that lowers the minimum input-to-output voltage drop by allowing the duty cycle to exceed 99%. The MAX1645B can easily charge one to four series Li+ cells.
Technical Docs
| Data Sheet | Advanced Chemistry-Independent, Level 2 Battery Charger with Input Current Limiting | Nov 14, 2006 |
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 .
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