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Power Supply Concept - Siemens C25 Service Manual

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Private Communication Systems
Mobile Phones
5.3

Power Supply Concept

The C25 has two main power inputs:
1) Battery Voltage (3.6 Volts) connected at the battery contacts
2) Charging Voltage (6.5 Volts) delivered by the different charger types (see
accessory list) via the Lumberg connector at the bottom of the telephone.
Since the battery voltage is supplying the power supply asic, it is always needed to
operate the phone. You cannot switch on the handset if the battery voltage is not
present.
From the battery voltage all other supply voltages of the C25 are derived, controlled
by the power supply ASIC.
The RF power amplifier needs an operation voltage of 5,4Volts, which is generated
by a DC-DC step-up converter.
The logic module uses 2.9 V, generated by a regulator inside the ASIC.
V 1.0
Service Manual C25 / C2588
ICP CD ST
R. Fleuren
Sm_C25_lvl2_v10_w97
Page 19 of 32
02/99

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C2588

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