Power Management And High Efficiency Switcher Maximize Ninevolt Battery Life

EZ Battery Reconditioning Method

How to Recondition a Battery

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by LTC Applications Staff

The LTC1174 (3.3V, 5V and adjustable versions) can convert a 9V battery source to system power with very high efficiency. Efficiency is over 90% at load currents from 20mA to 425mA and over 85% at a load current of 4mA. For a given load, maximum battery life can be obtained by minimizing shutdown current during system shutdown and maximizing converter efficiency during operation. A single control line to the LTC1174 can be used to select shutdown mode or operational mode, as required.

For this circuit (Figure 156), power-up is initiated by a low level signal on the NAND gate. This signal could come from any front-panel switch or from an external interrupt signal. The system power is turned off by means of a low level signal from a controller/logic device. In either case, the control signal to the LTC1174 must be latched. (A latched turn-off signal ensures a known state on the LTC1174 shutdown pin during the collapse of the 5V supply.)

The CD4012 and CD4013 are powered from the battery; the 2N2222 provides simple level shifting to the battery rail. R1 and C1 ensure that the circuit remains in power-down mode during battery replacement. The circuit shown here provides approximately 90% efficiency at 250mA load current, and consumes less than 1|iA shutdown current. Turn-on and turn-off transitions are very clean.

Tvr Battery Circuit Repaire

Figure 156. Schematic Diagram of High Efficiency DC/DC Converter

RUN STANDBY* RUN STANDBY

FROM OPEN COLLECTOR OUTPUT OF CONTROLLER 1 = ON, 0 = OFF

Figure 156. Schematic Diagram of High Efficiency DC/DC Converter

RUN STANDBY* RUN STANDBY

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DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

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