MAX660EPA Maxim Integrated Products, MAX660EPA Datasheet - Page 8

• Manufacturer Part Number: MAX660EPA
• Description: Charge Pumps CMOS Monolithic Voltage Converter
• Manufacturer: Maxim Integrated Products

Specifications of MAX660EPA

• Function: Inverting, Step Up
• Output Voltage: - 1.5 V to - 5.5 V, 3 V to 11 V
• Output Current: 100 mA
• Maximum Operating Temperature: + 85 C
• Package / Case: PDIP-8 Narrow
• Minimum Operating Temperature: - 40 C
• Mounting Style: Through Hole

CMOS Monolithic Voltage Converter
The following is a list of manufacturers who provide
low-ESR electrolytic capacitors:
8
Manufacturer/
Figure 3. Cascading MAX660s to Increase Output Voltage
AVX TPS Series
AVX TAG Series
Matsuo 267 Series [phone]
Sprague 595
Series
Sanyo MV-GX
Series
Sanyo CV-GX
Series
Nichicon PL
Series
United Chemi-Con
(Marcon)
TDK
C1
_______________________________________________________________________________________
Series
3
4
2
MAX660
"1"
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
Phone
5
8
C1n
+V
IN
C2
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
2
3
4
Fax
V
MAX660
OUT
"n"
= -nV
IN
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
Ceramic SMT
Ceramic SMT
8
5
Comments
C2n
V
OUT
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 R
an integer representing the number of devices cascad-
ed, is defined by V
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.
Figure 4. Paralleling MAX660s to Reduce Output Resistance
C1
2
3
4
OUT
MAX660
"1"
values. The output voltage, where n is
OUT
R
OUT
C1n
8
5
+V
= -n (V
=
IN
n (NUMBER OF DEVICES)
R
OUT
IN
2
3
4
Paralleling Devices
Cascading Devices
(of MAX660)
).
MAX660
"n"
8
5
C2
R
L