LM2670S-ADJ/NOPB National Semiconductor, LM2670S-ADJ/NOPB Datasheet - Page 8
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LM2670S-ADJ/NOPB
Manufacturer Part Number
LM2670S-ADJ/NOPB
Description
IC REG SIMPLE SWITCHER TO-263-7
Manufacturer
National Semiconductor
Series
SIMPLE SWITCHER®r
Type
Step-Down (Buck)r
Specifications of LM2670S-ADJ/NOPB
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.2 ~ 37 V
Current - Output
3A
Frequency - Switching
260kHz
Voltage - Input
8 ~ 40 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
D²Pak, TO-263 (7 leads + tab)
Primary Input Voltage
40V
No. Of Outputs
1
Output Voltage
37V
Output Current
3A
No. Of Pins
7
Operating Temperature Range
-40°C To +125°C
Msl
MSL 3 - 168 Hours
Filter Terminals
SMD
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Other names
*LM2670S-ADJ
*LM2670S-ADJ/NOPB
LM2670S-ADJ
*LM2670S-ADJ/NOPB
LM2670S-ADJ
www.national.com
Other Applications
REGULATING V
It is possible to regulate the negative output of the LM2664
by use of a low dropout regulator (such as LP2980). The
whole converter is depicted in Figure 6. This converter can
give a regulated output from −1.8V to −5.5V by choosing the
proper resistor ratio:
OUT
FIGURE 6. Combining LM2664 with LP2980 to Make a Negative Adjustable Regulator
V
where, V
out
= V
ref
ref
(1 + R
= 1.23V
(Continued)
1
FIGURE 5. Combined Voltage Doubler and Inverter
/R
2
)
8
Note that, the following conditions must be satisfied simulta-
neously for worst case design:
V
V
in_max
in_min
+ I
+ I
out_max
out_min
<
>
V
V
out_min
out_max
x R
x R
out_max
out_min
+V
+V
drop_max
drop_min
10003112
(LM2664)
(LM2664)
10003124
(LP2980)
(LP2980)