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MAX861IUA Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX861IUA Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page 50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters _______________________________________________________________________________________ 9 Compatibility with MAX660/MAX665/ICL7660 The MAX860/MAX861 can be used in sockets designed for the MAX660, MAX665, and ICL7660 with a minimum of one wiring change. This section gives advice on installing a MAX860/MAX861 into a socket designed for one of the earlier devices. The MAX660, MAX665, and ICL7660 have an OSC pin instead of – S — H — D — N – . MAX660, MAX665, and ICL7660 nor- mal operation is with OSC floating (although OSC can be overdriven). If OSC is floating, pin 7 ( – S — H — D — N – ) should be jumpered to VDD to enable the MAX860/MAX861 permanently. Do not leave – S — H — D — N – on the MAX860/ MAX861 floating. The MAX860/MAX861 operate with FC either floating or connected to VDD, OUT, or GND; each connection defines the oscillator frequency. Thus, any of the nor- mal MAX660, MAX665, or ICL7660 connections to pin 1 will work with the MAX860/MAX861, without modifica- tions. Changes to the FC connection are only required if you want to adjust the operating frequency. MAX860 MAX861 8 7 5 VOUT = (2VIN) - (VFD1) - (VFD2) C2 +VIN C1 2 3 4 VOUT = -VIN C4 D1 D1, D2 = 1N4148 C3 D2 Figure 3. Combined Doubler and Inverter PART NUMBER OUTPUT CURRENT (mA) OUTPUT RESISTANCE ( Ω) SWITCHING FREQUENCY (kHz) MAX660 100 6.5 5/40 MAX665 100 6.5 5/40 MAX860 50 12 6/50/130 MAX861 50 12 13/100/250 ICL7660 10 55 5 Table 5. Product Selection Guide TRANSISTOR COUNT: 101 SUBSTRATE CONNECTED TO VDD VDD SHDN OUT LV FC C1+ GND C1- 0.084" (2.13mm) 0.058" (1.47mm) ___________________Chip Topography |
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