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LM2662 Folha de dados(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Nome de Peças LM2662
Descrição Electrónicos  Switched Capacitor Voltage Converter
Download  12 Pages
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2662 Folha de dados(HTML) 8 Page - National Semiconductor (TI)

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Application Information (Continued)
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
Where I
Q(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.
Low ESR capacitors (
Table 3) are recommended for both capacitors to maximize efficiency, reduce the output voltage drop and
voltage ripple. For convenience, C
1 and C2 are usually chosen to be the same.
The output resistance varies with the oscillator frequency and the capacitors. In
Figure 3, the output resistance vs. oscillator fre-
quency curves are drawn for four difference capacitor values. 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 100 kHz for the 47 µF capaci-
tors), 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. Ceramic
capacitors can be chosen for their lower ESR. As shown in
Figure 3, in higher frequency range, the output resistance using the
10 µF ceramic capacitors is close to these using higher value tantalum capacitors.
TABLE 3. Low ESR Capacitor Manufacturers
Manufacturer
Phone
Capacitor Type
Nichicon Corp.
(708)-843-7500
PL, PF series, through-hole aluminum electrolytic
AVX Corp.
(803)-448-9411
TPS series, surface-mount tantalum
Sprague
(207)-324-4140
593D, 594D, 595D series, surface-mount tantalum
Sanyo
(619)-661-6835
OS-CON series, through-hole aluminum electrolytic
Murata
(800)-831-9172
Ceramic chip capacitors
Taiyo Yuden
(800)-348-2496
Ceramic chip capacitors
Tokin
(408)-432-8020
Ceramic chip capacitors
DS100003-36
FIGURE 3. Output Source Resistance vs Oscillator Frequency
www.national.com
8


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