POWER SUPPLIES
MCUK991001G8
Section 9
Issue 1
Technical Guide
– 37 –
Revision 0
9.5 Power Management
9.5.1 Overview
The power supply circuit supplies regulated power to the base-band parts, controls battery charging and monitors battery
usage.
The Power Management section consists of five parts as follows:
1.
Power Source.
2.
Power On/Off Control & Power Source Failure.
3.
Voltage Regulation.
4.
Battery Charging & Monitoring.
5.
Accessory Control.
The power amplifiers used in GD30/GD50 are powered directly from the battery supply to maximise the power available to
them. They operate at full specification between 3.0 and 3.6 Volts.
9.5.2 Power Source
Nickel Metal Hydride (Ni-MH) cells are used for the EB-BSD30 and EB-BLD30 battery packs. The standard battery packs
contain three cells giving a nominal voltage of 3.6 V.
EB-BSD50 battery packs use Lithium-Ion cells which have the advantage of reduced weight, size and improved gravimetric
and volumetric densities compared to that of Ni-MH cells.
