SI9121 phones equivalent, high-voltage/ non-isolated buck-boost converter for isdn digital phones.
D Fixed +5-V or +3.3-V Output D Integrated Floating Feedback Amplifier D On-Chip 70-V, 1.5-W N-Channel MOSFET Switch D Integrated High Voltage Start-Up Circuit, with VCC .
the Si9121 is rated to the industrial temperature range of
–40_C to 85_C.
FUNCTIONAL BLOCK DIAGRAM
GN.
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