MC1121 - ON Semiconductor

MC1121 100mA Charge Pump Voltage Converter with Shutdown

Frequency control for internal oscillator, FC = open, FOSC = 10kHz typ; FC = VDD, FOSC = 200kHz typ, FC has no effect when OSC pin is driven externally Charge–pump capacitor, positive terminal Power–supply ground input CAP+ GND CAP– Charge–pump capacitor, negative terminal Output, negative voltage Shutdown VOUT SHDN OSC VDD Oscillator control input. An exter.

Features

• Converts a 2.4V to 5.5V Input Voltage to a Corresponding Negative Output Voltage (Inverter Mode)
• Uses Only 2 Capacitors; No Inductors Required!
• High Output Current: 100mA
• Selectable Oscillator Frequency: 10kHz to 200kHz
• Power
  –Saving Shutdown Input
• Optional High
  –Frequency Operation Allows Use of Small Capacitors
• Low Operating Current (FC = GND): 50µA
• Tested Operating Temperature Range:
  –40°C to +85°C Typical Applications
• Laptop Computers
• Medical Instruments
• Disk Drives
• µP
  –Based Controllers
• Process Instrumentation FUNCTIONAL BLOCK DIAGRAM + CAP+ SHDN FC OSC
  – CAP
  – C1 h.