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TC1121 Datasheet(PDF) 1 Page - Microchip Technology |
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TC1121 Datasheet(HTML) 1 Page - Microchip Technology |
1 / 14 page 2002 Microchip Technology Inc. DS21358B-page 1 M TC1121 Features • Optional High-Frequency Operation Allows Use of Small Capacitors • Low Operating Current (FC = GND) -50 µA • High Output Current (100mA) • Converts a 2.4V to 5.5V Input Voltage to a Corresponding Negative Output Voltage (Inverter Mode) • Uses Only 2 Capacitors; No Inductors Required • Selectable Oscillator Frequency - 10kHz to 200kHz • Power-Saving Shutdown Input • Available in 8-Pin MSOP, 8-Pin PDIP and 8-Pin Small Outline (SOIC) Packages Applications • Laptop Computers • Medical Instruments •Disk Drives • µP-Based Controllers • Process Instrumentation Device Selection Table Package Type General Description The TC1121 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 TC1121 uses no inductors saving cost, size and EMI. An on-board oscillator operates at a typical frequency of 10kHz (at V+ = 5V) when the frequency control input (FC) is connected to ground. The oscillator frequency increases to 200kHz when FC is connected to V+, allowing the use of smaller capacitors. Operation at sub-10kHz frequencies results in lower quiescent NScurrent and is accomplished with the addition of an external capacitor from OSC (pin 7) to ground. The TC1121 also can be driven from an external clock NSconnected OSC. Typical supply current at 10kHz is 50 µA, and falls to less than 1µA when the shutdown input is brought low, whether the internal or an external clock is used. The TC1121 is available in 8-pin SOIC, MSOP and PDIP packages. Part Number Package Operating Temp. Range TC1121COA 8-Pin SOIC 0°C to +70°C TC1121CPA 8-Pin PDIP 0°C to +70°C TC1121CUA 8-Pin MSOP 0°C to +70°C TC1121EOA 8-Pin SOIC -40°C to +85°C TC1121EPA 8-Pin PDIP -40°C to +85°C TC1121EUA 8-Pin MSOP -40°C to +85°C TC1121COA TC1121EOA TC1121CUA TC1121EUA SHDN FC CAP+ CAP– 1 2 3 4 8 7 6 5 GND OSC V+ 8-Pin SOIC 8-Pin MSOP VOUT TC1121CPA TC1121EPA SHDN FC CAP+ CAP– 1 2 3 4 8 7 6 5 GND OSC V+ 8-Pin PDIP VOUT 100mA Charge Pump Voltage Converter with Shutdown |
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