LM2660M/NOPB National Semiconductor, LM2660M/NOPB Datasheet - Page 9

• Manufacturer Part Number: LM2660M/NOPB
• Description: IC MULTI CONFIG .1A 8SOIC
• Manufacturer: National Semiconductor
• Type: Switched Capacitor (Charge Pump), Divider, Doubler, Invertingr

Specifications of LM2660M/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Current - Output: 100mA
• Frequency - Switching: 40kHz
• Voltage - Input: 1.5 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Power - Output: 735mW
• Primary Input Voltage: 5V
• No. Of Outputs: 1
• Output Current: 100mA
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Current Rating: 100A
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Other names: *LM2660M; *LM2660M/NOPB; LM2660M

Other Applications
CASCADING DEVICES
Cascading the LM2660s (or LM2661s) is an easy way to
produce a greater negative voltage (as shown in Figure 5). If
n is the integer representing the number of devices cas-
caded, the unloaded output voltage V
effective output resistance is equal to the weighted sum of
each individual device:
FIGURE 5. Increasing Output Voltage by Cascading Devices
(Continued)
out
FIGURE 6. Generating −3V
is (−nV
in
). The
9
A three-stage cascade circuit shown in Figure 6 generates
−3V
Cascading is also possible when devices are operating in
doubling mode. In Figure 7, two devices are cascaded to
generate 3V
An example of using the circuit in Figure 6 or Figure 7 is
generating +15V or −15V from a +5V input.
Note that, the number of n is practically limited since the
increasing of n significantly reduces the efficiency and in-
creases the output resistance and output voltage ripple.
in
in
, from V
from +V
in
in
.
.
in
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