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.
Key Features
Applications/Uses
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)
2-, 3-, or 4-Series Li+ Battery Packs for Portable Products
Key Specifications:
Battery Protectors, Selectors and Monitors
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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