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LM2765 Datasheet(PDF) 7 Page - Texas Instruments

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Part # LM2765
Description  LM2765 Switched Capacitor Voltage Converter
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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LM2765 Datasheet(HTML) 7 Page - Texas Instruments

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LM2765
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SNVS070C – MARCH 2000 – REVISED MAY 2013
CAPACITOR SELECTION
As discussed in the Positive Voltage Doubler 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.
The selection of capacitors is based on the specifications of the dropout voltage (which equals Iout Rout), the
output voltage ripple, and the converter efficiency. Low ESR capacitors (Table 1) are recommended to maximize
efficiency, reduce the output voltage drop and voltage ripple.
Table 1. Low ESR Capacitor Manufacturers
Manufacturer
Phone
Website
Capacitor Type
Nichicon Corp.
(847)-843-7500
www.nichicon.com
PL & PF series, through-hole aluminum electrolytic
AVX Corp.
(843)-448-9411
www.avxcorp.com
TPS series, surface-mount tantalum
Sprague
(207)-324-4140
www.vishay.com
593D, 594D, 595D series, surface-mount tantalum
Sanyo
(619)-661-6835
www.sanyovideo.com
OS-CON series, through-hole aluminum electrolytic
Murata
(800)-831-9172
www.murata.com
Ceramic chip capacitors
Taiyo Yuden
(800)-348-2496
www.t-yuden.com
Ceramic chip capacitors
Tokin
(408)-432-8020
www.tokin.com
Ceramic chip capacitors
Other Applications
PARALLELING DEVICES
Any number of LM2765s can be paralleled to reduce the output resistance. Each device must have its own
pumping capacitor C1, while only one output capacitor Cout is needed as shown in Figure 14. The composite
output resistance is:
(4)
Figure 14. Lowering Output Resistance by Paralleling Devices
Copyright © 2000–2013, Texas Instruments Incorporated
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