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TC1142 Datasheet(PDF) 1 Page - Microchip Technology |
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TC1142 Datasheet(HTML) 1 Page - Microchip Technology |
1 / 12 page 2002 Microchip Technology Inc. DS21360B-page 1 M TC1142 Features • Input Range 2.5V to 5.5V • Regulated Output Options from -3.0 to -5.0V • Output Current 20mA (max) • 200kHz Internal Oscillator Frequency • External Synchronizing Clock Input • Logic Level Shutdown -1 µA (max) Supply Current • Available in 8-Pin MSOP Package Applications • Cellular Phones • Battery Powered/Portable Equipment Device Selection Table *Other output voltages are available (-3.5V and -4.5V). Please contact Microchip Technology Inc. for details. Package Type General Description The TC1142 generates a regulated negative voltage from -3V to -5V at 20mA from an input of 2.5V to 5.5V, using only three external capacitors. Other boost/buck switching regulators must use an inductor, which is larger and radiates EMI. An internal voltage comparator inhibits the charge pump when VOUT is more negative than the regulated value (per the ordering option). The values of flying capacitors C1 and C2 are chosen to be less than COUT in order to reduce the ripple generated from regulating VOUT in this manner. The TC1142 also can be used as a -1x buck regulator by omitting C2, and connecting the C2 pin to VOUT. The part goes into shutdown when the CCLK input is driven low. When in shutdown mode, the part draws a maximum of 1 µA. When CCLK is pulled high, the part runs from the internal 200kHz oscillator. The device may be run with an external clock, provided the frequency is greater than 3kHz and less than 500kHz. The TC1142 comes in a space-saving MSOP package. Functional Block Diagram Part Number Output Voltage (V)* Package Operating Temp. Range TC1142-3.0EUA 3.0 8-Pin MSOP -40°C to +85°C TC1142-4.0EUA 4.0 8-Pin MSOP -40°C to +85°C TC1142-5.0EUA 5.0 8-Pin MSOP -40°C to +85°C GND C2– 1 2 3 4 8 7 6 5 TC1142 8-Pin MSOP C2+ VOUT C1– VIN C1+ CCLK TC1142-50 CCLK VOUT = -5.0V GND VIN 5.5V to 2.5V 0.47 µF 0.47 µF C1 C2 4.7 µF VOUT ON OSC OVERRIDE OFF –2x Boost/Buck COUT + – TC1142-30 CCLK VOUT = –3.0V GND VIN 5.5V to 3V 0.47 µFC1 C2– 4.7 µF VOUT OSC OVERRIDE –1x Buck COUT ON OFF + – Inductorless -2x Boost/Buck Regulator |
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