Only For Training And Service Purposes - LG KE990 - Viewty Cell Phone 100 MB Service Manual

3. TECHNICAL BRIEF
3.4.3 PMIC Functional Block Diagram (U501 : PM6635-3P)
■ 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 ESMC, ESME,
and PA (or second ESMC) supply voltages
- Supports dynamic voltage scaling (DVS) for ESMC 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 ESMA, ESMP, 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 ESMA and ESMP regulators
- All regulated outputs are derived from a common bandgap reference - close tracking
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Only for training and service purposes