Regulators - Nokia NKC-1X Series Technical Documentation Manual

CCS Technical Documentation

Regulators

The UEM has six regulators for baseband power supplies and seven regulators for RF
power supplies. The VR1 regulator has two outputs: (1) VR1a and (2) VR1b. In addition to
these, there are two current generators - IPA1 and IPA2 - for biasing purposes.
A bypass capacitor (1uF) is required for each regulator output to ensure stability.
Reference voltages for regulators require external 1uF capacitors. Vref25RF is the refer-
ence voltage for the VR2 regulator, Vref25BB is the reference voltage for the VANA,
VFLASH1, VFLASH2, VR1 regulators, Vref278 is the reference voltage for the VR3, VR4,
VR5, VR6, VR7 regulators, and VrefRF01 is the reference voltage for the VIO, VCORE reg-
ulators and for the radio frequency (RF).
BB
VANA: 2.78Vtyp 80mAmax
Vflash1: 2.78Vtyp 70mAmax
Vflash2: 2.78Vtyp
40mAmax
Note: Not used in NKC-1X
VIO: 1.8Vtyp
150mAmax
Vcore: 1.0-1.8V
200mAmax
The VANA regulator supplies the baseband's (BB) internal and external analog circuitry.
It is disabled in the Sleep mode.
The Vflash1 regulator supplies the LCD, the digital parts of the UEM and Safari asic. It is
enabled during startup and goes into the low Iq-mode when in the Sleep mode.
The VIO regulator supplies both the external and internal logic circuitries. It is used by
the LCD, flash and UPP. The regulator goes into the low Iq-mode when in the Sleep mode.
The VCORE regulator supplies the DSP and the core part of the UPP. The voltage is pro-
grammable and the startup default is 1.5V. The regulator goes into the low Iq-mode
when in the Sleep mode.
The VR1 regulator uses two LDOs (VR1A and VR1B) and a charge pump. The charge pump
requires one external 1uF capacitor in the Vpump pin and a 220nF flying capacitor
Issue 1 02/03
Table 1: UEM Regulators
RF
VR1a:4.75V 10mAmax
VR1b:4.75V
Note: Not used in NKC-1X.
VR2:2.78V 100mAmax
VR3:2.78V 20mAmax.
VR4: 2.78V 50mAmax
VR5: 2.78V 50mAmax
VR6: 2.78V 50mAmax
Note: Not used in NKC-1X
VR7: 2.78V 45mAmax
Nokia Corporation
NKC-1X
System Module
Current
IPA1: 0-5mA
IPA2: 0-5mA
Page 11