LM2660MM National Semiconductor, LM2660MM Datasheet - Page 10

• Manufacturer Part Number: LM2660MM
• Description: IC MULTI CONFIG .1A 8MSOP
• Manufacturer: National Semiconductor
• Type: Switched Capacitor (Charge Pump), Divider, Doubler, Invertingr

Specifications of LM2660MM

• 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-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Power - Output: 500mW
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Output: -
• Lead Free Status / Rohs Status: Not Compliant
• Other names: LM2660MMTR

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Other Applications
REGULATING V
It is possible to regulate the output of the LM2660/LM2661
by use of a low dropout regulator (such as LP2951). The
whole converter is depicted in Figure 8. This converter can
give a regulated output from −1.5V to −5.5V by choosing the
proper resistor ratio:
where, V
Also, as shown in Figure 9 by operating LM2660/LM2661 in
voltage doubling mode and adding a linear regulator (such
as LP2981) at the output, we can get +5V output from an
input as low as +3V.
ref
= 1.235V
FIGURE 8. Combining LM2660/LM2661 with LP2951 to Make a Negative Adjustable Regulator
out
(Continued)
FIGURE 7. Generating +3V
10
The error flag on pin 5 of the LP2951 goes low when the
regulated output at pin 4 drops by about 5%. The LP2951
can be shutdown by taking pin 3 high.
in
from +V
in
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