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LM3478 Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM3478
Description  High Efficiency Low-Side N-Channel Controller for Switching Regulator
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM3478 Datasheet(HTML) 3 Page - National Semiconductor (TI)

 
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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 Voltage
45V
FB Pin Voltage
-0.4V < V
FB < 7V
FA/SD Pin Voltage
-0.4V < V
FA/SD <
7V
Peak Driver Output Current (<10µs)
1.0A
Power Dissipation
Internally Limited
Storage Temperature Range
−65˚C to +150˚C
Junction Temperature
+150˚C
ESD Susceptibilty
Human Body Model (Note 2)
2kV
Lead Temperature
MM Package
Vapor Phase (60 sec.)
Infared (15 sec.)
215˚C
220˚C
DR Pin Voltage
−0.4V
≤ VDR ≤ 8V
I
SEN Pin Voltage
500mV
Operating Ratings (Note 1)
Supply Voltage
2.97V
≤ V
IN
≤ 40V
Junction
Temperature Range
−40˚C
≤ T
J
≤ +125˚C
Switching Frequency
100kHz
≤ F
SW
≤ 1MHz
Electrical Characteristics
Specifications in Standard type face are for T
J = 25˚C, and in bold type face apply over the full Operating Temperature
Range. Unless otherwise specified, V
IN = 12V, RFA = 40k
Symbol
Parameter
Conditions
Typical
Limit
Units
V
FB
Feedback Voltage
V
COMP = 1.4V,
2.97
≤ V
IN
≤ 40V
1.26
1.2416/1.228
1.2843/1.292
V
V(min)
V(max)
∆V
LINE
Feedback Voltage
Line Regulation
2.97
≤ V
IN
≤ 40V
0.001
%/V
∆V
LOAD
Output Voltage Load
Regulation
I
EAO Source/Sink
±0.5
%/V (max)
V
UVLO
Input Undervoltage
Lock-out
2.85
2.97
V
V(max)
V
UV(HYS)
Input Undervoltage
Lock-out Hysteresis
170
130
210
mV
mV (min)
mV (max)
F
nom
Nominal Switching
Frequency
R
FA = 40K
400
360
430
kHz
kHz(min)
kHz(max)
R
DS1 (ON)
Driver Switch On
Resistance (top)
I
DR = 0.2A, VIN=5V
16
R
DS2 (ON)
Driver Switch On
Resistance (bottom)
I
DR = 0.2A
4.5
V
DR (max)
Maximum Drive
Voltage Swing(Note 6)
V
IN < 7.2V
V
IN
V
V
IN
≥ 7.2V
7.2
D
max
Maximum Duty
Cycle(Note 7)
100
%
T
min (on)
Minimum On Time
325
210
600
nsec
nsec(min)
nsec(max)
I
SUPPLY
Supply Current
(switching)
(Note 9)
2.0
3.0
mA
mA (max)
I
Q
Quiescent Current in
Shutdown Mode
V
FA/SYNC/SD = 5V (Note
10), V
IN =5V
5
10
µA
µA (max)
V
SENSE
Current Sense
Threshold Voltage
V
IN = 5V
165
140/ 135
195/ 200
mV
mV (min)
mV (max)
www.national.com
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