LG KU250 Service Manual - Page 26
PMIC Functional Block Diagram U300 : PM6650-2M - usb driver
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3. TECHNICAL BRIEF 3.5.4 PMIC Functional Block Diagram (U300 : PM6650-2M) • Input power management - Valid external supply attachment and removal detection - Supports unregulated (closed-loop) external charger supplies and USB supplies as input power sources - Supports lithium-ion main batteries - Trickle, constant current, constant voltage, and pulsed charging of the main battery - Supports coin cell backup battery (including charging) - Battery voltage detectors with programmable thresholds - VDD collapse protection - Charger current regulation and real-time monitoring for over-current protection - Charger transistor protection by power limit control - Control drivers for two external pass transistors and one external battery MOSFET - MOSFET is optional - Voltage, current, and power control loops - Automated recovery from sudden momentary power loss • Output voltage regulation - One boost (step-up) switched-mode power supply (SMPS) for driving white LEDs and hosting USBOTG - Three buck (step-down) switched-mode power supplies that efficiently generate MSMC, MSME, and PA (or second MSMC) supply voltages - Supports dynamic voltage scaling (DVS) for MSMC and PA - Eleven low dropout regulator circuits with programmable output voltages, implemented using three different current ratings: 300 mA (two), 150 mA (six), and 50 mA (three). These can be used to power MSMA, MSMP, RFRX1, RFRX2, RFTX, SYNT, TCXO, WLAN, MMC, USB, and RUIM circuits. - All regulators can be individually enabled/disabled for power savings - Low power mode available on MSMA and MSMP regulators - All regulated outputs are derived from a common bandgap reference-close tracking • Integrated handset-level housekeeping functions reduces external parts count, size, cost - Analog multiplexer selects from 8 internal and up to 18 external inputs - Multiplexer output's offset and gain are adjusted, increasing the effective ADC resolution - Adjusted multiplexer output is buffered and routed to an MSM device ADC - Dual oscillators - 32.768 kHz off-chip crystal and on-chip RC assures MSM device sleep clock - Crystal oscillator detector and automated switch-over upon lost oscillation - Real time clock for tracking time and generating associated alarms - On-chip adjustments minimize crystal oscillator frequency errors - Circuits control TCXO warm-up and synchronize, deglitch, and buffer the TCXO signal - TCXO buffer control for optimal QPH/catnap timing - Three-stage over-temperature protection (smart thermal control) - 27 -