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MC1121

ON Semiconductor
Part Number MC1121
Manufacturer ON Semiconductor
Description 100mA Charge Pump Voltage Converter with Shutdown
Published Apr 26, 2005
Detailed Description MC1121 100mA Charge Pump Voltage Converter with Shutdown The MC1121 is a charge pump converter with 100mA output current...
Datasheet PDF File MC1121 PDF File

MC1121
MC1121

Overview
MC1121 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 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 http://onsemi.
com Micro8 DM SUFFIX CASE TBD PRELIMINARY INFORMATION PIN CONFIGURATION (Top View) FC 1 CAP+ 2 GND 3 CAP– 4 MC1121 8 VDD 7 OSC 6 SHDN 5 VOUT ORDERING INFORMATION Device MC1121DMR2 Package Micro–8 Shipping 2500 Tape/Reel OSC CONTROL RC OSCILLATOR SWITCH MATRIX Vout + C2 VDD GND MC1121 LOGIC CIRCUITS © Semiconductor Components Industries, LLC, 1999 1 February, 2000 – Rev.
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