Charge pump converts - 5V to 5V

摘要

VERSATILE SWITCHED-CAPACITOR charge-pump voltage converters can provide a negative supply voltage from a positive-voltage source or double a positive source's voltage. However, certain applications that consist entirely of ECL (emitter-coupled-logic) circuits provide only a negative-voltage supply-for example, - 5.2V. Figure 1 shows how you can use a switched-capacitor converter to obtain a positive power-supply voltage suitable for powering ECL-to-TTL (transistor-to-transistor-logic)-level translators and other circuits.