LM3481MMX National Semiconductor, LM3481MMX Datasheet - Page 3

• Manufacturer Part Number: LM3481MMX
• Description: High Efficiency Low-Side N-Channel Controller for Switching Regulators
• Manufacturer: National Semiconductor

V
ΔV
ΔV
V
I
V
I
V
f
V
V
R
R
V
D
t
I
I
UVLO
COMP
nom
min
SUPPLY
Q
FB
UVLOSEN
UVLOSD
COMP
sync-HI
sync-LOW
DR (max)
DS1 (ON)
DS2 (ON)
max
Symbol
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Electrical Characteristics
V
for T
min/max specification limits are guaranteed by design, test, or statistical analysis. (Notes 3, 4)
V
FB Pin Voltage
FA/SYNC/SD Pin Voltage
COMP Pin Voltage
UVLO Pin Voltage
V
DR Pin Voltage
I
Peak Driver Output Current
Power Dissipation
LINE
LOAD
SEN
IN
(on)
IN
CC
=12V, R
pin Voltage
J
Pin Voltage
Pin Voltage
= 25°C. Limits appearing in boldface type apply over the full Operating Temperature Range (-40°C to 125°C). Datasheet
Feedback Voltage
Feedback Voltage Line
Regulation
Output Voltage Load
Regulation
Undervoltage Lockout
Reference Voltage
UVLO Source Current
UVLO Shutdown Voltage
COMP pin Current Sink
Nominal Switching
Frequency
Threshold for
Synchronization on
FA/SYNC/SD pin
Threshold for
Synchronization on
FA/SYNC/SD pin
Driver Switch On
Resistance (top)
Driver Switch On
Resistance (bottom)
Maximum Drive Voltage
Swing(Note 6)
Maximum Duty Cycle
Minimum On Time
Supply Current (switching) (Note 8)
Quiescent Current in
Shutdown Mode
FA
=40 kΩ unless otherwise indicated under the Conditions column. Typicals and limits appearing in plain type apply
Parameter
V
2.97
2.97
I
V
Enabled
V
V
R
Synchronization Voltage
Rising
Synchronization Voltage
Falling
I
I
V
V
V
V
V
V
EAO
DR
DR
COMP
UVLO
FB
FB
IN
IN
FA/SYNC/SD
IN
FA/SYNC/SD
IN
FA
= 0.2A, V
= 0.2A
< 6V
≥
= 12V
= 5V
Internally Limited
= 0V
= 1.275V
–0.4V to 600 mV
= 40 kΩ
Source/Sink
≤
≤
6V
Ramping Down
= 1.4V,
V
V
-0.4V to 50V
(Note 1)
IN
IN
Conditions
-0.4V to 6V
-0.4V to 6V
-0.4V to 6V
-0.4V to 6V
-0.4V to 6V
-0.4V to 6V
≤
≤
= 3V(Note 9),
= 3V(Note 9),
IN
48V
48V
= 5V
1.0A
3
Operating Ratings
Storage Temperature Range
Junction Temperature
ESD Susceptibilty
Human Body Model (Note 2)
Lead Temperature
Supply Voltage
Junction Temperature Range
Switching Frequency
Range
MM Package
Vapor Phase (60 sec.)
Infared (15 sec.)
1.256
1.345
Min
406
3
Typical
1.275
0.003
1.430
±0.5
640
475
250
0.7
1.4
0.7
V
3.7
85
5
1
4
2
6
9
5
IN
(Note 1)
1.294
1.517
Max
550
5.0
15
10
6
100 kHz to 1 MHz
−40°C to +125°C
−65°C to +150°C
2.97V to 48V
www.national.com
+150°C
Units
%/V
%/V
kHz
mA
215°C
220°C
µA
µA
µA
ns
%
Ω
Ω
V
V
V
V
V
V
V
2 kV