Rainbow-electronics ICL7660 Manual do Utilizador

_______________General DescriptionThe MAX1044 and ICL7660 are monolithic, CMOSswitched-capacitor voltage converters that invert, dou-ble, divide, or m

MAX1044/ICL7660Positive Voltage DoublerFigure 9 illustrates the recommended voltage doublercircuit for the MAX1044/ICL7660. To reduce the voltagedrops

Paralleling DevicesParalleling multiple MAX1044/ICL7660s reduces outputresistance and increases current capability. As illus-trated in Figure 13, eac

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses arei

MAX1044/ICL7660Switched-Capacitor Voltage Converters2 _______________________________________________________________________________________ABSOLUTE

809010030101EFFICIENCYvs. OSCILLATOR FREQUENCY70MAX1044-Fig 7OSCILLATOR FREQUENCY (Hz)EFFICIENCY (%)10450401021036x10560105C1, C2 = 100µFC1, C2 = 10µ

0.112345678910QUIESCENT CURRENTvs. SUPPLY VOLTAGEMAX1044-Fig 12SUPPLY VOLTAGE (V)QUIESCENT CURRENT (µA)10110010002000ABDCA: MAX1044, BOOST = V+, LV =

_______________Detailed DescriptionThe MAX1044/ICL7660 are charge-pump voltage con-verters. They work by first accumulating charge in abucket capacito

MAX1044/ICL7660current is: I = f x ∆Q = f x C1(V+ - VOUT). Rewriting thisequation in Ohm’s law form defines an equivalent resis-tance synthesized by t

and allow operation down to 1.5V. For low-voltageoperation and compatibility with the industry-standardLTC1044 and ICL7660, the LV pin should be conne

MAX1044/ICL7660a function of oscillator frequency and the capacitorvalue. Oscillator frequency, in turn, is influenced bytemperature and supply voltag

The first term is the effective resistance from theswitched-capacitor circuit. Conversion losses occur during the transfer of chargebetween capacitors