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LM2673SDX-3.3 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM2673SDX-3.3
Descripción Electrónicos  SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2673SDX-3.3 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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All Output Voltage Versions
Electrical Characteristics
Limits appearing in bold type face apply over the entire junction temperature range of operation, −40˚C to 125˚C. Specifica-
tions appearing in normal type apply for T
A =TJ = 25˚C. Unless otherwise specified, RADJ = 8.2K
Ω,V
IN=12V for the 3.3V, 5V
and Adjustable versions and V
IN=24V for the 12V version.
Symbol
Parameter
Conditions
Typ
Min
Max
Units
DEVICE PARAMETERS
I
Q
Quiescent
Current
V
FEEDBACK = 8V
4.2
6
mA
For 3.3V, 5.0V, and ADJ Versions
V
FEEDBACK = 15V
For 12V Versions
V
ADJ
Current Limit
Adjust Voltage
1.21
1.181/1.169
1.229/1.246
V
I
CL
Current Limit
R
ADJ = 8.2K
Ω, (Note 5)
4.5
3.8/3.6
5.25/5.4
A
I
L
Output Leakage
Current
V
IN = 40V, Softstart Pin = 0V
V
SWITCH =0V
V
SWITCH = −1V
1.0
6
1.5
15
mA
mA
R
DS(ON)
Switch
On-Resistance
I
SWITCH = 3A
0.15
0.17/0.29
f
O
Oscillator
Frequency
Measured at Switch Pin
260
225
280
kHz
D
Duty Cycle
Maximum Duty Cycle
91
%
Minimum Duty Cycle
0
%
I
BIAS
Feedback Bias
Current
V
FEEDBACK = 1.3V
ADJ Version Only
85
nA
V
SFST
Softstart
Threshold
Voltage
0.63
0.53
0.74
V
I
SFST
Softstart Pin
Current
Softstart Pin = 0V
3.7
6.9
µA
θ
JA
Thermal
Resistance
T Package, Junction to Ambient
65
(Note 6)
θ
JA
T Package, Junction to Ambient
45
(Note 7)
θ
JC
T Package, Junction to Case
2
θ
JA
S Package, Junction to Ambient
56
˚C/W
(Note 8)
θ
JA
S Package, Junction to Ambient
35
(Note 9)
θ
JA
S Package, Junction to Ambient
26
(Note 10)
θ
JC
S Package, Junction to Case
2
++
θ
JA
SD Package, Junction to Ambient
55
˚C/W
(Note 11)
θ
JA
SD Package, Junction to Ambient
29
(Note 12)
www.national.com
4


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