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MAX1719EUT Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX1719EUT Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 8 page SOT23, Switched-Capacitor Voltage Inverters with Shutdown Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Paralleling Devices Paralleling multiple MAX1719s, MAX1720s, or MAX1721s reduces the output resistance. Each device requires its own pump capacitor (C1), but the reservoir capacitor (C2) serves all devices (Figure 5). Increase C2’s value by a factor of n, where n is the number of parallel devices. Figure 5 shows the equation for calcu- lating output resistance. Combined Doubler/Inverter In the circuit of Figure 6, capacitors C1 and C2 form the inverter, while C3 and C4 form the doubler. C1 and C3 are the pump capacitors; C2 and C4 are the reservoir capacitors. Because both the inverter and doubler use part of the charge-pump circuit, loading either output causes both outputs to decline toward GND. Make sure the sum of the currents drawn from the two outputs does not exceed 25mA. Heavy Load Connected to a Positive Supply Under heavy loads, where a higher supply is sourcing current into OUT, the OUT supply must not be pulled above ground. Applications that sink heavy current into OUT require a Schottky diode (1N5817) between GND and OUT, with the anode connected to OUT (Figure 7). Layout and Grounding Good layout is important, primarily for good noise per- formance. To ensure good layout, mount all compo- nents as close together as possible, keep traces short to minimize parasitic inductance and capacitance, and use a ground plane. MAX1719 MAX1720 MAX1721 2 5 1 VOUT = (2VIN) - (VFD1) - (VFD2) C2 +VIN C1 3 4 6 VOUT = -VIN C4 D1 D1, D2 = 1N4148 C3 D2 SHDN (MAX1719) SHDN (MAX1720) (MAX1721) Figure 6. Combined Doubler and Inverter MAX1719 MAX1720 MAX1721 4 1 GND OUT V+ RL Figure 7. Heavy Load Connected to a Positive Supply TRANSISTOR COUNT: 85 MAX1719 MAX1720 MAX1721 “n” MAX1719 MAX1720 MAX1721 “1” 2 1 VOUT C2 2 +VIN C1 C1 3 3 44 6 5 5 6 1 VOUT = -VIN RO = RO OF SINGLE DEVICE NUMBER OF DEVICES … … SHDN (MAX1719) SHDN (MAX1720/ MAX1721) Figure 5. Paralleling MAX1719s or MAX1720s or MAX1721s to Reduce Output Resistance Chip Information |
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