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LM2676 数据手册 - National
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LM2676数据手册
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Supply Voltage 45V
ON/OFF Pin Voltage −0.1V to 6V
Switch Voltage to Ground −1V to V
IN
Boost Pin Voltage V
SW
+8V
Feedback Pin Voltage −0.3V to 14V
Power Dissipation Internally Limited
ESD (Note 2) 2 kV
Storage Temperature Range −65˚C to 150˚C
Soldering Temperature
Wave 4 sec, 260˚C
Infrared 10 sec, 240˚C
Vapor Phase 75 sec, 219˚C
Operating Ratings
Supply Voltage 8V to 40V
Junction Temperature Range (T
J
) −40˚C to 125˚C
Electrical Characteristics Limits appearing in bold type face apply over the entire junction temperature
range of operation, −40˚C to 125˚C. Specifications appearing in normal type apply for T
A
=T
J
= 25˚C.
LM2676-3.3
Symbol Parameter Conditions Typical Min Max Units
(Note 3) (Note 4) (Note 4)
V
OUT
Output Voltage V
IN
= 8V to 40V, 100mA ≤ I
OUT
≤ 3A 3.3 3.234/3.201 3.366/3.399 V
η Efficiency V
IN
= 12V, I
LOAD
=3A 86 %
LM2676-5.0
Symbol Parameter Conditions Typical Min Max Units
(Note 3) (Note 4) (Note 4)
V
OUT
Output Voltage V
IN
= 8V to 40V, 100mA ≤ I
OUT
≤ 3A 5.0 4.900/4.850 5.100/5.150 V
η Efficiency V
IN
= 12V, I
LOAD
=3A 88 %
LM2676-12
Symbol Parameter Conditions Typical Min Max Units
(Note 3) (Note 4) (Note 4)
V
OUT
Output Voltage V
IN
= 15V to 40V, 100mA ≤ I
OUT
≤ 3A 12 11.76/11.64 12.24/12.36 V
η Efficiency V
IN
= 24V, I
LOAD
=3A 94 %
LM2676-ADJ
Symbol Parameter Conditions Typ Min Max Units
(Note 3) (Note 4) (Note 4)
V
FB
Feedback
Voltage
V
IN
= 8V to 40V, 100mA ≤ I
OUT
≤ 3A
V
OUT
Programmed for 5V
1.21 1.186/1.174 1.234/1.246 V
η Efficiency V
IN
= 12V, I
LOAD
=3A 88 %
LM2676
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