3V to 9V DC Converters

Description: This document presents several DC converter circuits that convert input voltages from 3V to 9V. These converters can be particularly useful in scenarios where a 9V battery is not available or deemed too costly. The first circuit is straightforward, utilizing the TL496 power supply controller, an inductor, and an electrolytic capacitor. The maximum output current is 405mA, with a no-load current consumption of 125µA, resulting in an estimated battery life of approximately 166 days.

The described circuit operates as a step-up (boost) converter, which is essential for applications requiring a higher voltage output than the input voltage. The TL496 is a versatile integrated circuit designed for power supply regulation, and its inclusion in this circuit allows for efficient voltage conversion.

The circuit architecture typically consists of the TL496 configured in a feedback loop to regulate the output voltage. The inductor stores energy when the switch (often a transistor controlled by the TL496) is closed and releases it to the output when the switch is opened. The electrolytic capacitor smooths the output voltage, ensuring a stable DC output suitable for powering devices that require a 9V supply.

The input current specification indicates that at maximum output, the circuit draws 405mA from the input source, which is a critical parameter for battery-powered applications. The no-load current consumption of 125µA signifies the efficiency of the circuit when idle, allowing for prolonged battery life, estimated at around 166 days under optimal conditions.

Such converters are invaluable in portable electronic devices, where battery life and cost-effectiveness are significant concerns. The simplicity of the design also makes it accessible for hobbyists and engineers looking to implement efficient power solutions in their projects.Here are some 3V to 9V DC converter circuits that were requested by some of our visitors. It may be helpful to have one of this converters when no 9V battery is available or if you consider that they are too expensive. The first circuit is very simple, it uses the TL496 power supply controller, a coil and a electrolytic capacitor.

The input curren t (the current drawn from the batteries) is 405mA at the maximum output current. Without load the current consumption is 125 µA and the batteries life is around 166 days.