Power Supply - Toshiba libretto U100 Maintenance Manual

1.7 Power Supply

1.7 Power Supply
The power supply supplies different voltages to the system board.
The power supply microcontroller has the following functions.
1. Judges that the DC power supply (AC adapter) is connected to the computer.
2. Detects DC output and circuit malfunctions.
3. Controls the battery icon, and DC IN icon.
4. Turns the battery charging system on and off and detects a fully charged battery.
5. Turns the power supply on and off.
6. Provides more accurate detection of a low battery.
7. Calculates the remaining battery capacity.
8. Controls the transmission of the status signal of the main battery.
The power supply output rating is specified in Table 1-9.
Name Voltage (V)
PPV 0.940 –0.81
PTV 1.05
1R8-P1V
1R35-P1V 1.35/1.2
A1R35-P1V 1.35/1.2
2R5-B2V
Q2R5-B2V
MR1R25-B1V 1.25
1R25M-B1V 1.25
1R5-S1V
S3V
M5V
libretto U100 Maintenance Manual (960-520)
Table 1-9 Power supply output rating (1/2)
CPU (VCC)
CPU (VCCP), GMCH, ICH4-M
CPU (VCCA0)
1.8
GMCH (1.2V in power saving mode)
GMCH (VCCASM) (1.2V in power saving mode)
2.5 GMCH, DDR-SDRAM
2.5 GMCH (VCCQSM)
SO-DIM DDR-SDRAM (VREF), GMCH
On Board DDR SDRAM (VREF)
ICH4-M
1.5
ICH4-M, EC/KBC
3.3
ICH4-M, Temperature reset IC, LEDs
5
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