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MAX1720 데이터시트(PDF) 6 Page - ON Semiconductor

부품명 MAX1720
상세설명  Switched Capacitor Voltage Inverter with Shutdown
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MAX1720 데이터시트(HTML) 6 Page - ON Semiconductor

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MAX1720
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6
Capacitor Selection
In order to maintain the lowest output resistance and
output ripple voltage, it is recommended that low ESR
capacitors be used. Additionally, larger values of C1 will
lower the output resistance and larger values of C2 will
reduce output voltage ripple. (See Equation 3).
Table 1 shows various values of C1, C2 and C3 with the
corresponding output resistance values at 25
°C. Table 2
shows the output voltage ripple for various values of C1, C2
and C3. The data in Tables 1 and 2 was measured not
calculated.
Table 1. Output Resistance vs. Capacitance
(C1 = C2 = C3), Vin = 4.75 V and Vout = −4.0 V
C1 = C2 = C3
(
mF)
Rout
(
W)
0.7
129.1
1.4
69.5
3.3
37.0
7.3
26.5
10
25.9
24
24.1
50
24
Table 2. Output Voltage Ripple vs. Capacitance
(C1 = C2 = C3), Vin = 4.75 V and Vout = −4.0 V
C1 = C2 = C3
(
mF)
Output Voltage Ripple
(mV)
0.7
382
1.4
342
3.3
255
7.3
164
10
132
24
59
50
38
Input Supply Bypassing
The input voltage, Vin should be capacitively bypassed to
reduce AC impedance and minimize noise effects due to the
switching internals in the device. If the device is loaded from
Vout to GND, it is recommended that a large value capacitor
(at least equal to C1) be connected from Vin to GND. If the
device is loaded from Vin to Vout, a small (0.7 mF) capacitor
between the pins is sufficient.
Voltage Inverter
The most common application for a charge pump is the
voltage inverter (Figure 14). This application uses two or
three external capacitors. The C1 (pump capacitor) and C2
(output capacitor) are required. The input bypass capacitor,
C3, may be necessary depending on the application. The
output is equal to −Vin plus any voltage drops due to loading.
Refer to Tables 1 and 2 for capacitor selection. The test setup
used for the majority of the characterization is shown in
Figure 14.
Layout Considerations
As with any switching power supply circuit, good layout
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Also, use a large ground plane to minimize noise
leakage into other circuitry.
Capacitor Resources
Selecting the proper type of capacitor can reduce switching
loss. Low ESR capacitors are recommended. The MAX1720
was characterized using the capacitors listed in Table 3. This
list identifies low ESR capacitors for the voltage inverter
application.
Table 3. Capacitor Types
Manufacturer/Contact
Part Types/Series
AVX
843−448−9411
www.avxcorp.com
TPS
Cornell Dubilier
508−996−8561
www.cornell−dubilier.com
ESRD
Sanyo/Os−con
619−661−6835
www.sanyovideo.com/oscon.htm
SN
SVP
Vishay
603−224−1961
www.vishay.com
593D
594
6
4
2
3
1
OSC
Capacitors = 10
mF
+
+
Vin
5
+
−Vout
Figure 18. Voltage Inverter


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