The SC905 family of power management ICs feature nine ultra low dropout regulators capable of sourcing up to 300 mA from multiple inputs over an I2 C serial interface. Each part's output current and noise is matches the handset's baseband functions: microprocessor core, analog, keypad, receiver, transmitter, VCO, PLL, camera, and vibrator motor. The Semtech SC905 and SC905A also include battery charger IC control when paired with the company's standalone battery chargers to provide a complete, cost-effective power regulation solution.
Five of the regulators on the SC905 can generate low noise outputs in the 2.55 to 2.9 V range to power noise-sensitive analog circuitry such as audio, RF, or oscillator circuits. Three of the other regulators generate outputs in the 1.35 to 2.9 V range and are designed for powering digital circuits. One additional regulator can drive up to 150 mA (between 1.35 and 2.9 V) to be used as a general supply or as a vibrator motor supply.
The SC905A offers expanded I/O voltage ranges, allowing it to support a larger variety of CDMA chipsets. The SC905A also contains a dedicated enable pin for the vibrator motor regulator and transceiver output.
The devices come with a power-on control pin for on/off control of the baseband processor, oscillator, keypad and audio. Two other pins are available to power up the device when connected to a battery charger or hands-free kit.
The SC905 and SC905A are available immediately in production quantities and are priced at $2.44 each in 1000-piece lots. More information is available at www.semtech.com.