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AN-D9: TN06 Series: Battery Back-Up Utilizes Low Threshold:  Supertex Semiconductors (app note added 2/06)

Battery Backup Converter uses One NiCd Cell:  02/03/97 EDN Design Ideas / (Circuit / schematic design added 6/06) Notebook computers and other portable equipment often use a backup battery to retain memory contents during replacement of the main battery. Such "bridge batteries" usually consist of five or six series-connected NiCd coin cells. They're expected to keep the system alive for approximately 5 minutes—plenty of time to swap batteries. The circuit in Figure 1 reduces size, weight, and cost by using one NiCd cell instead of five or six. A Saft VB4E 40-mAhr NiCd coin cell has enough capacity to keep a typical notebook computer in suspend mode for approximately 10 minutes. All components (excluding the coin cell) consume less than 1/2 in.2 of pc-board area, and the cost savings from fewer cells help pay for the added circuitry.....

Buck Converter Handles Battery Backup System:  04/24/03 EDN Design Ideas  /  (added 12/04)  A synchronous buck converter is inherently bidirectional. That is, it transfers energy from input to output as a buck regulator when the output voltage is low, but, when the output voltage is high, the converter acts as a boost regulator, transferring power from output to input. This Design Idea shows how to use this bidirectional energy transfer to automatically recharge a battery when the mai......

Memory Supply Includes Battery Backup:  02/03/97 EDN-Design Ideas / (Circuit / schematic design added 6/06)

Microcontroller Provides SrAM Battery Backup:  06/26/03 EDN Design Ideas  /  (added 12/04)  To maintain content in the event of power loss, many designs that include SRAM require a dedicated device that can automatically switch from a standard power supply to battery operation. Microcontrollers seldom find use in power-switching applications. Because microcontrollers typically operate from the primary power supply, they stop execution if that supply drops, thereby making it impossible......

TN06 Series:  Supertex Semiconductors (app note added 2/06)