REGULATED_CHARGE_PUMP

Published:2009/7/10 22:13:00 Author:May | From:SeekIC

The dc-dc converter substitutes a voltage tripler in place of the external inductor and the diode that's typically associated with the switching regulator, IC1. Inverting and noninverting amplifiers in the MOS-FET-driver (IC2) activate a diode-capacitor tripling network (D1 through D3, C1 through C3).A 50-kHz oscillator residing within IC1 produces the EXT signal (pin 6). IC2 converts this signal into drive signals (180°out of phase) for the tripler. The resulting charge-discharge action in the capacitors recharges C3 toward 10 V every 20 μs. The ferrite bead limits output ripple to about 20-m Vpp for a 50-mA load. Conversion efficiency is about 70% for the 5-V input, 10-V output configuration.



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