LM2661MMX National Semiconductor, LM2661MMX Datasheet - Page 10
LM2661MMX
Manufacturer Part Number
LM2661MMX
Description
Manufacturer
National Semiconductor
Datasheet
1.LM2661MMX.pdf
(13 pages)
Specifications of LM2661MMX
Operating Supply Voltage (min)
1.5V
Operating Supply Voltage (max)
5.5V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Package Type
MSOP
Pin Count
8
Mounting
Surface Mount
Lead Free Status / Rohs Status
Not Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM2661MMX
Manufacturer:
NS/国半
Quantity:
20 000
www.national.com
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
01291125
01291127