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SC905A Datasheet(PDF) 1 Page - Semtech Corporation |
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SC905A Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 23 page  www.semtech.com 1 POWER MANAGEMENT SC905A CDMA Cellular Phone Power Management IC June 7, 2006 Description The SC905A is a power management integrated circuit (PMIC) designed for the latest CDMA chip sets. The device provides four general purpose low dropout regulators (LDOs), and five low noise LDOs designed for analog circuits. The VMOT LDO can be used as a general purpose regulator or as an adjustable motor drive output that can supply up to 150mA to drive a vibrator motor. Each LDO’s enable and output voltage are controlled via the I2C bus. The VTCXO output has an external enable pin that can be used instead of the register bit when timing is critical for minimizing sleep current. The VMOT also has an external enable pin for additional flexibility. Initial power-on is achieved by activating either the ON button, the battery charger, or the HFPWR signal, and the PGOOD input is used by the microprocessor to latch power on or disable the device. The thermally-efficient MLPQ-32 package combined with miniature ceramic bypass capacitors minimize required PCB area, making the SC905A ideal for space-conscious portable applications. 9 LDO Linear Regulators CORE: 1.35V - 2.90V @ 300mA ANA: 2.55V - 2.90V @ 200mA PAD: 1.75V - 3.30V @ 300mA RX: 2.75V - 3.10V @ 150mA TX: 2.75V - 3.10V @ 150mA TCXO: 2.75V - 3.10V @ 80mA PLL: 2.75V - 3.10V @ 80mA Camera: 1.75V - 3.30V @ 100mA Motor Drive: 1.75V - 3.30V @ 150mA I2C Interface for Microprocessor Control Less than 1μA Quiescent Current in Shutdown 65dB PSRR for Analog LDOs Over-Temperature Protection Power-On Control Small 5mm x 5mm 32-Pin MLPQ Package CDMA Cellular Handsets PDAs/Smartphones Wireless VOIP Handsets Features Typical Application Circuit Applications 10μF VBAT MOTOR 0. 1μF ON/OFF 1μ F Keypad Baseband Processor Audio Processing Digital Interface Camera Module TCXO + Synthesiser PLL Transmitter Section PA Receiver Section LNA SC905A VBAT IN 1 IN 2 IN 3 IN 4 IN 5 IN 6 DVIN VCORE VPAD VANA VTCXO VTX VRX VCAM VPLL VPSEL VCSEL DGND CHPWR EN_TCXO EN_MOT AGND BP VMOT RESB PWRON SCL PGOOD HFPWR ON SDA B A TTE RY Handsfree Option Battery Charger Circuit 1μF 1μF 1μF 1μF 1μF 1μ F 1μF |
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