MAX868EUB+

The MAX868EUB+ is a regulated Inverting Charge Pump for battery-operated equipment. The MAX868 inverting charge pump provides a low-cost and compact means of generating a regulated negative voltage up to -2 x VIN from a positive input voltage between 1.8 and 5.5V. It uses a pulse-frequency-modulation (PFM) control scheme to generate the regulated negative output voltage. PFM operation is obtained by gating the internal 450kHz oscillator on and off as needed to maintain output voltage regulation. This unique on-demand switching scheme gives the MAX868 excellent light-load efficiency without degrading its full-load operation (up to 30mA), permitting smaller capacitors to take advantage of the oscillator's high switching frequency. The MAX868 requires no inductors; only four capacitors are required to build a complete DC-DC converter. Output voltage regulation is achieved by adding just two resistors.

• Regulated negative output voltage (up to -2 x VIN)
• On-demand switching at up to 450kHz
• 30µA Quiescent supply current
• Requires only four small external capacitors
• 0.1µA Logic-controlled shutdown
• Up to 30mA output current
• Adjustable output voltage

Notas

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