Littelfuse, Inc.

Semiconductor Components Industries, LLC

John M Jorgensen

Sam S Kang

Dominick L Richiuso

Rong Liu

Kunghao Yu

William N Buchele

James Lu

Anguel Svilenov Brankov

Chad N Marak

Bharat Shenoy

Secondary battery protection circuits for protecting a battery from charging and/or discharging faults are provided. A secondary battery protection circuit may include a first terminal and a second terminal, a transistor electrically connected between the first terminal and the second terminal, a fuse electrically coupled to the gate of the transistor, and a fuse control circuit configured to cause current sufficient to open the fuse to pass through the fuse in the event of a fault condition.

Secondary protection with permanent disable for a battery

A transient voltage suppressor may include a silicon controlled rectifier (SCR) having an anode coupled to Vcc. The SCR may include a PNP transistor (Q) and an NPN transistor (Q), the PNP transistor having a base in common with a collector of the NPN transistor and the PNP transistor having a collector in common with a base of the NPN transistor. The TVS may further include a Zener diode having an anode and cathode, wherein the anode is directly coupled to the base of the NPN transistor and/or the cathode is directly coupled to the base of the PNP transistor, and an additional NPN transistor (Q). The cathode of the SCR may be directly coupled to a base of the additional NPN transistor, and a collector and emitter of the additional NPN transistor may be directly coupled in series between Vand ground.

Transient voltage suppressor

A method for implementing an inductor-capacitor filter in an integrated circuit. Embodiments of the invention implement a 5-pole LC low-pass filter suitable for incorporation in wireless applications necessitating compact layouts. Inductors are formed in an IC as concentric coils on metallization layers, the concentric coils providing a negative coupling coefficient between the inductors. The invention provides programmable frequency response characteristics, enabling the transmission of high-frequency base band information while attenuating carrier RF frequencies.

Integrated passive filter incorporating inductors and ESD protectors

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Reno, NV, United States of America

John M Jorgensen