MAX660C Просмотр технического описания (PDF) - Maxim Integrated
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MAX660C Datasheet PDF : 12 Pages
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CMOS Monolithic Voltage Converter
The following is a list of manufacturers who provide
low-ESR electrolytic capacitors:
Manufacturer/
Series
Phone
AVX TPS Series (803) 946-0690
AVX TAG Series (803) 946-0690
Matsuo 267 Series (714) 969-2491
Sprague 595
Series
(603) 224-1961
Sanyo MV-GX
Series
(619) 661-6835
Sanyo CV-GX
Series
(619) 661-6835
Nichicon PL
Series
(847) 843-7500
United Chemi-Con
(Marcon)
(847) 696-2000
TDK
(847) 390-4373
Fax
Comments
(803) 626-3123
(803) 626-3123
(714) 960-6492
(603) 224-1430
(619) 661-1055
(619) 661-1055
(847) 843-2798
Low-ESR
tantalum SMT
Low-cost
tantalum SMT
Low-cost
tantalum SMT
Aluminum elec-
trolytic thru-hole
Aluminum elec-
trolytic SMT
Aluminum elec-
trolytic thru-hole
Low-ESR
tantalum SMT
(847) 696-9278 Ceramic SMT
(847) 390-4428 Ceramic SMT
Cascading Devices
To produce larger negative multiplication of the initial
supply voltage, the MAX660 may be cascaded as
shown in Figure 3. The resulting output resistance is
approximately equal to the sum of the individual
MAX660 ROUT values. The output voltage, where n is
an integer representing the number of devices cascad-
ed, is defined by VOUT = -n (VIN).
Paralleling Devices
Paralleling multiple MAX660s reduces the output resis-
tance. As illustrated in Figure 4, each device requires
its own pump capacitor C1, but the reservoir capacitor
C2 serves all devices. The value of C2 should be
increased by a factor of n, where n is the number of
devices. Figure 4 shows the equation for calculating
output resistance.
+VIN
8
8
2
2
C1
3 MAX660
"1"
C1n
3 MAX660
"n"
4
5
4
5
VOUT
C2n
C2 VOUT = -nVIN
ROUT =
ROUT (of MAX660)
n (NUMBER OF DEVICES)
+VIN
8
8
2
2
RL
C1
3
MAX660
"1"
C1n
3 MAX660
"n"
4
5
4
5
C2
Figure 3. Cascading MAX660s to Increase Output Voltage
Figure 4. Paralleling MAX660s to Reduce Output Resistance
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