LG Electronics LG-C320 service manual Power management, Input power management

3. TECHNICAL BRIEF

3.2 Power management

3.2.1 Input power management

Valid external supply attachment and removal detection

Unregulated (closed-loop) external charger supply as input power source Integrated PFET charging pass transistor; eliminated sense resistor

Support for lithium-ion and lithium-ion polymer main batteries; nickel-based batteries are not supported Trickle, constant current, constant voltage, and pulse charging of the main battery

Autonomous charging option – driven by an on-chip state machine without software intervention Software-controlled charging option – backwards-compatible with previous QSC and PM products Coin-cell battery (including charging)

Battery-voltage detectors with programmable thresholds VDD collapse protection

Charger-current regulation and real-time monitoring for overcurrent protection Charger-transistor protection by thermal control

Control drivers for the internal charging PFET and external battery PFET Voltage, current, and thermal control loops

Automated recovery from sudden momentary power loss (requires external32.768 kHz crystal)

Figure 3.2.1 Input circuits schematic diagram

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