Philips PageWriter TC70 - Load_PWR; +3.3 V; VCC_RTC; VCC_Core (+1.5 V)

Theory of Operation Power System Overview
8-12 PageWriter TC 70 Cardiograph Service Manual
Load_PWR
The voltage is supplied by Vin and the battery. Its range is between 9.0V to 14.43V. This
voltage is monitored.
+3.3V
Output from regulator U1401 (LTC1628). The input to this regulator is from Loads_PWR and
can supply 3.3V at up to 4.0A of current. This voltage is monitored.
VCC_RTC
Output from regulator U1403 (LT3470) for the real timer and power sequence circuit. The
voltage level is 3.3V, and can provide up to 200mA of current. This voltage is not monitored.
VCC_Core (+1.5V)
Output from regulator U1202 (LTC3445) which is 1.5V core power for the embedded
processor. The input to this regulator is from the 3.3V supply and can supply up to 600mA of
current. This voltage is monitored.
VCC_SRAM (+1.1V)
Output from regulator U1202 (LTC3445), which is 1.1V SRAM power for the embedded
processor. The input to this regulator is from the +3.3V supply, and can supply up to 50mA of
current. This voltage is not monitored.
VCC_PLL (+1.3V)
Output from regulator U1202 (LTC3445), which is 1.3V PLL power for the embedded
processor. The input to this regulator is from the +3.3V supply, and can supply up to 50mA of
current. This voltage is not monitored.
VCC_1P8 (+1.8V)
Output from regulator U1201 (LTC3404), which is 1.8V power for the flash memory core.
The input to this regulator is from the +3.3V supply, and can supply up to 600mA of current.
This voltage is monitored.
VCC_1P5 (+1.5V)
Output from regulator U1203 (LTC3406), which is 1.5V core power for the FPGA. The input
to this regulator is from the +3.3V supply, and can supply up to 600mA of current. This
voltage is monitored.
VCC_INT_PLD (+1.8V)
Output from regulator U1402 (LT1761), which is 1.8V power for the CPLD core. The input to
this regulator is from the +3.3V supply, and can supply up to 100mA of current. This voltage
is not monitored.