Maxim MAX868EUB

РатиометрическийЗарядный насос1.8V5.5V30 мА

Overview

The MAX868EUB 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 1.8V 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 MAX868EUB 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 MAX868EUB 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. The MAX868EUB comes in a 10-pin μMAX package, which is only 1.11mm high and occupies just half the board area of a standard 8-pin SO.

Features

Applications

• Servo drive system
• Digital display device
• Linear guide
• Ball screw pair
• Computer application technology
• Network technology
• Automation technology
• CMM
• Various precision measuring instruments
• Various precision measuring detectors