Power And Charging Design; Regulators - Ericsson EF738 Service Manual

Technical Description

Power and Charging Design

Battery
Connector
System
Connector

Regulators

The phone is powered by three regulators as follows:
• VDIG powers the digital/audio/user interface circuitry
• VMALIN powers MALIN TX and buffer
• VRAD powers the remaining radio circuitry
20
3.8V Regulator
Battery Voltage
(MIA)
VCO
TX Buffer
Red/Green LED
Backlight LEDs
Buzzer
3.8V Regulator
Figure 9: Power Distribution
Flash
GUSTAV 3.3V
GUSTAV 3.8V
EEPROM
Buzzer Driver
LED Driver
Buzzer &
Indicator Light
Regulator
LCD
ANTON
MIA
Accessories
BERTINDY Power Amp
DOUT1 Low Level
TX Power
BERTINDY
VCO
BERTINDY
LNA/Mixer
DOUT0
MALIN RX Parts
BERTINDY 2nd
LO
Coupler
IF Chip