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LM2660M датащи(PDF) 9 Page - Texas Instruments

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номер детали LM2660M
подробное описание детали  LM2660 Switched Capacitor Voltage Converter
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LM2660
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SNVS135D – SEPTEMBER 1999 – REVISED MAY 2013
The switching frequency of the converter (also called the charge pump frequency) is half of the oscillator
frequency.
NOTE
OSC cannot be driven by an external clock in the voltage-doubling mode.
Table 1. LM2660 Oscillator Frequency Selection
FC
OSC
Oscillator
Open
Open
10 kHz
V+
Open
80 kHz
Open or V+
External Capacitor
See Typical Performance Characteristics
N/A
External Clock
External Clock
(inverter mode only)
Frequency
CAPACITOR SELECTION
As discussed in the SIMPLE NEGATIVE VOLTAGE CONVERTER section, the output resistance and ripple
voltage are dependent on the capacitance and ESR values of the external capacitors. The output voltage drop is
the load current times the output resistance, and the power efficiency is
(3)
Where IQ(V+) is the quiescent power loss of the IC device, and IL
2R
OUT is the conversion loss associated with the
switch on-resistance, the two external capacitors and their ESRs.
Since the switching current charging and discharging C1 is approximately twice as the output current, the effect
of the ESR of the pumping capacitor C1 is multiplied by four in the output resistance. The output capacitor C2 is
charging and discharging at a current approximately equal to the output current, therefore, its ESR only counts
once in the output resistance. However, the ESR of C2 directly affects the output voltage ripple. Therefore, low
ESR capacitors (Table 2) are recommended for both capacitors to maximize efficiency, reduce the output voltage
drop and voltage ripple. For convenience, C1 and C2 are usually chosen to be the same.
The output resistance varies with the oscillator frequency and the capacitors. In Figure 17, the output resistance
vs. oscillator frequency curves are drawn for three different tantalum capacitors. At very low frequency range,
capacitance plays the most important role in determining the output resistance. Once the frequency is increased
to some point (such as 20 kHz for the 150
μF capacitors), the output resistance is dominated by the ON
resistance of the internal switches and the ESRs of the external capacitors. A low value, smaller size capacitor
usually has a higher ESR compared with a bigger size capacitor of the same type. For lower ESR, use ceramic
capacitors.
Copyright © 1999–2013, Texas Instruments Incorporated
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