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Protects Against Overvoltage ±1% Accurate Protection Thresholds Integrated 2.1s Fault-Delay Timer Built-in 1.5A SCR Fuse Driver Test Mode for Functional Verification in Assembled Pack 8µA (max) Supply Current 1µA (max) Standby Current Protects Against Disconnected B1P-B4P Pins Protects 2-, 3-, or 4-Series Li+ Battery Packs Available in Small 16-Pin QFN Package (5mm x 5mm)
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Key Features
Applications/Uses
Simplified Block Diagram
Technical Docs
| Data Sheet | Li+ Battery-Pack Protector with Integrated Fuse Driver | May 24, 2002 |
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Key Features
Applications/Uses
- 2-, 3-, or 4-Series Li+ Battery Packs for Portable Products
Description
The MAX1906 protects against overvoltage conditions in lithium-ion/lithium polymer (Li+) battery packs by blowing a three-terminal protection fuse. The IC should be used in conjunction with resettable protection circuits to provide a high level of safety against overcharging Li+ batteries. It can be used with 2-, 3-, or 4-series cell battery packs.
The MAX1906 monitors individual cell voltages. If any cell voltage exceeds the overvoltage threshold for greater than 2.1s, the MAX1906 activates an internal SCR. The SCR sinks sufficient current to blow an external protection fuse, permanently disabling the battery pack. Alternatively, the IC can drive the gate of an external MOSFET to blow the fuse.
The MAX1906 also offers protection against disconnected voltage sense pins. If a disconnected pin is detected, the DISCON output is forced low. The MAX1906 includes a test mode, which determines if the circuit is operating correctly while in an assembled battery pack.
The low-cost MAX1906 is available in a thermally enhanced 16-pin QFN package.
The MAX1906 monitors individual cell voltages. If any cell voltage exceeds the overvoltage threshold for greater than 2.1s, the MAX1906 activates an internal SCR. The SCR sinks sufficient current to blow an external protection fuse, permanently disabling the battery pack. Alternatively, the IC can drive the gate of an external MOSFET to blow the fuse.
The MAX1906 also offers protection against disconnected voltage sense pins. If a disconnected pin is detected, the DISCON output is forced low. The MAX1906 includes a test mode, which determines if the circuit is operating correctly while in an assembled battery pack.
The low-cost MAX1906 is available in a thermally enhanced 16-pin QFN package.
Technical Docs
| Data Sheet | Li+ Battery-Pack Protector with Integrated Fuse Driver | May 24, 2002 |
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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