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Applying the TC1219/TC1220 Inverting Charge Pumps with Small External Capacitor Values

From Microchip Technology, Inc.

Microchip Technology Inc.'s TC1219 (switching frequency at 12 kHz) and TC1220 (switching frequency at 35 kHz) are inverting charge pump voltage converters that are specified using rather large capacitors (10 µF for the TC1219 and 3.3 µF for the TC1220). These capacitor sizes allow the designer the luxury of a reasonably low output resistance (25??typical) capable of driving load currents up to 25 mA. However, these larger-value external capacitors are more expensive and require additional printed circuit board (PCB) space than their smaller-valued counterparts. Additionally, the time required to shutdown these charge pump converters becomes longer with larger-value external capacitors and in certain higher-speed applications, this unfortunate feature can be devastating.
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