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The device, which has been designated the TPS9104, saves significant board space, while cutting the costs of individual components and reducing power requirements. Other applications for the device include Personal Communication System (PCS) handsets and Personal Digital Assistants (PDAs) that combine wireless communication with personal computer technology.
"An integrated solution like the TPS9104 simplifies our design task and, when we are ready to bring our product to market, it will be more reliable than a design based on discrete devices," said Jeff Coletti, member of the technical staff in Lucent Technologies' Wireless Technology and Production Center, one of the first users of the device. "The reduced board space requirements of the TPS9104 gives us the opportunity to add other features and capabilities to our products for which we might not otherwise have had room."
"After talking with several cellular telephone manufacturers, we were able to identify the capabilities and flexibilities this kind of integrated solution should have," said TI's Bob Newton, product specialist. "The TPS9104 gives phone designers everything they need for the power supply and audio portion of the phone, but, because of the many options the device has built into it, vendors can continue to differentiate their products in the marketplace."
Each regulator can be programmed independently to supply either 3.0 or 3.3 volts to the system. Two of the regulators have their own enable pins. The regulators may either be powered up or down internally or controlled by an external processor to save energy by shutting down circuitry that is not needed. When the entire device is powered-down, it consumes less than one micro-amp of power.
The TPS9104's charge pump driver will deliver 10 milli-amps of power. The charge pump can be used to double the voltage or invert it to a negative voltage. For example, as a voltage inverter, the charge pump can supply the negative backlight voltage for the cellular phone's back-light LCD (liquid crystal display).
The TPS9104 features an on/off switch function that can be used to power up the system, turn on the logic regulator and initiate a microprocessor reset. The reset function features a 250 milli-second delay to ensure that the power is stable before the microprocessor begins to operate.
An evaluation module (EVM) from TI will help designers analyze the TPS9104s operation. The EVM board allows designers to power-up a TPS9104 and test its capabilities as a standalone device. Also, the EVM can be used to connect the device to a processor or system prototype to analyze the ease with which it can be integrated into a system.
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