Panasonic EB-X700 Service Manual

Also see for EB-X700: Operating instructions

− 4-16 −4.8. Power SuppliesFigure 4.11: Power Supply and Related Sub-System Block DiagramJ300I/O CNP300Li-IONBattery780mAHQ301EXT_PWRVBUSVACCR321BATTTEMPD302D301D303U304SM-PWRR313VLBB1VLBB2SDBBVINTVSIM1VRF3VRF1VRF2V28VSDVUSBVANAU300Com-panionIC VLBB3SENSEOUTVRTC2VRTC3VMAINSDBBBT300R327U100SGOLDVINTVLBB2VLBB1SDBBVANAVSIM1VRTC2RTCSENSEOUTBATT_TEMPU200OMAPVUSBV28VLBB3SDBBVBUSSIM VSIM1SWVSIM1RFDCDCOUTBacklightMain/Sub/PhotoVBATTVRF2VRF1U102MEMORYSDBBQ401U201BluetoothVRF3U203MEMORYSDBBMini-SDVSDSub-LCDV28Main-LCDV28CameraV28IrDAV28DCDCOUTChargingCKTVBATTVAUDIOPWRKEYRESET_NI2C and Control I/FKeypad, Alert, Charging LEDMVIBVIBLEDSLED1/2IPC andControl I/FAP_RSTCLK(13MHz, 32kHz)F26MR252R2514.8.1 IntroductionThe power management block primarily consists of SM-PWR (U304) and Companion IC (U300). U304 is a highly integratedpower management ASIC with a complete on/off logic and charging control, regulators, LED drivers, 8-ohm speaker andvibrator driver. The companion IC is an ASIC that complements U304 providing the additional functionality like back-up batterycharging, audio switching including stereo/mono headset, boost converter and additional regulators.The Power Management Block consists of the following sections:1. Power Source2. Power Control Logic3. System Power Supply4. Battery Charging & Monitoring5. Accessory Detection4.8.2 Power SourceThe main battery is a single Lithium-Ion 780mAH(Li-Ion) cell with 3.7v nominal voltage. The RTC back-up battery is a Lithium-Ion 0.5mAH coin cell with 3.0v nominal voltage. The charger supported is a 5.6v±0.4v, 700mAH