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MC1121DMR2
100mA Charge Pump Voltage Converter with Shutdown
-----The MC1121 is a charge pump converter with 100mA output
current capability. It converts a 2.4V to 5.5V input to a corresponding
negative output voltage. As with all charge pump converters, the
MC1121 uses no inductors saving cost, size, and reducing EMI.
An on–board oscillator operates at a typical frequency of 10kHz (at
VDD = 5V) when the frequency control input (FC) is connected to
ground. The oscillator frequency increases to 200kHz when FC is
connected to VDD, allowing the use of smaller capacitors. Operation at
sub–10kHz frequencies results in lower quiescent current and is
accomplished with the addition of an external capacitor from OSC (pin
7) to ground. The MC1121 can be driven from an external clock
connected OSC. Typical supply current at 10kHz is 50μA, and falls to
less than 1μA when the shutdown input is brought low, whether the
internal or an external clock is used. The MC1121 is available in a
Micro–8 package.
Features Converts a 2.4V to 5.5V Input V oltage 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 DIAGRAMSHDN
OSC
VDD
GND
