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LM2660-MWC Scheda tecnica(PDF) 11 Page - Texas Instruments

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Il numero della parte LM2660-MWC
Spiegazioni elettronici  Switched Capacitor Voltage Converter
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LM2660
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SNVS135E – SEPTEMBER 1999 – REVISED DECEMBER 2014
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The LM2660 CMOS charge-pump voltage converter is a versatile unregulated switched capacitor inverter or
doubler. Operating from a wide 1.5 V to 5.5 V supply voltage, the LM2660 uses two low-cost capacitors to
provide 100 mA of output current without the cost, size and EMI related to inductor-based converters. With an
operating current of only 120 µA and operating efficiency greater than 90% at most loads, the LM2660 provides
ideal performance for battery-powered systems. LM2660 devices can be operated directly in parallel to lower
output impedance, thus providing more current at a given voltage.
9.2 Typical Applications
9.2.1 Voltage Inverter
Figure 14. LM2660 Voltage Inverter
9.2.1.1 Design Requirements
The main application of LM2660 is to generate a negative supply voltage. The voltage inverter circuit uses only
two external capacitors as shown in the Figure 14. The range of the input supply voltage is 1.5 V to 5.5 V. For a
supply voltage less than 3.5V, the LV pin must be connected to ground to bypass the internal regulator circuitry.
This gives the best performance in low voltage applications. If the supply voltage is greater than 3.5 V, LV may
be connected to ground or left open. The choice of leaving LV open simplifies the direct substitution of the
LM2660 for the LMC7660 Switched Capacitor Voltage Converter.
9.2.1.2 Detailed Design Procedure
The output characteristics of this circuit can be approximated by an ideal voltage source in series with a resistor.
The voltage source equals
−(V+). The output resistance Rout is a function of the ON resistance of the internal
MOS switches, the oscillator frequency, and the capacitance and ESR of C1 and C2. A good approximation is:
where
RSW is the sum of the ON resistance of the internal MOS switches shown in Figure 13.
(1)
High value, low ESR capacitors will reduce the output resistance. Instead of increasing the capacitance, the
oscillator frequency can be increased to reduce the 2/(fosc × C1) term. Once this term is trivial compared with RSW
and ESRs, further increasing in oscillator frequency and capacitance will become ineffective.
The peak-to-peak output voltage ripple is determined by the oscillator frequency, and the capacitance and ESR
of the output capacitor C2:
(2)
Again, using a low ESR capacitor will result in lower ripple.
Copyright © 1999–2014, Texas Instruments Incorporated
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