Voltage Regulation - Panasonic G600 Technical Manual

POWER SUPPLIES
9.5.1 Power On Circuit
There are two mechanisms for powering on the Hand-held: Power Key or External power. The Hand-held is kept
powered on by the CPU, stay alive, or external power. This means that the phone remains powered up all the time
that external power is present. To minimize drain on external power, for example, while the phone is connected to a
car kit with ignition off, the phone is put into sleep-mode to give an average power use of less than 2mA. For a
20AHr car battery this would give approximately 416 days before the battery would run flat, if left connected and the
phone powered off – assuming no battery self discharge.

Voltage Regulation

Using four cell Ni-MH or two cell Li-ION with 3.0V logic gives no problems with high regulator voltage dropout.
Especially in Li-ION cells, high voltage dropout reduces the efficiency more than a small voltage dropout. To
increase the current consumption efficiency, the G600 uses 3.4V step-down DC/DC voltage regulators. The DC/DC
step-down circuitry uses two regulators on the LOGIC side and three regulators on the RF side to reduce the power
loss to minimum.
The G600 has the following power sources:
D3V : Baseband power supply for digital circuitry (GEMINI and Memory)
Voltage
Current
A3V : Baseband power supply for Analogue circuitry (VEGA and Voice-Memo)
Voltage
Current
D5V, SIM5V : SIM power supply (SIM access interface)
Voltage
Current
VDD : Common power supply
Voltage
Current
VDD power source is supplied by either the battery or the EXT_PWR. VDD supplies the 3.4V step-down DC/DC
converter, 5.5V step-up DC/DC converter and the LED's.
DCOUT : Step-down DC/DC converter output (input power for D3V and A3V regulators)
Voltage
Current
Ext_PWR : External power supply
Voltage
Current
VBAT : Battery power supply
Voltage
Issue 1
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3.0V±5%
200mA max.
3.0V ±5%
200mA max.
5.0V ±5%
50mA max.
8.5V max.
200mA max.
3.445V ± 5%
250mA max.
9.2V ± 0.2V
430mA ± 30mA
Ni-MH Li-ION
4.8V nominal 7.2V nominal
Section 9
9 - 6
MCUK980101G8
Technical Guide