lm2673sx-adj National Semiconductor Corporation, lm2673sx-adj Datasheet - Page 4

• Manufacturer Part Number: lm2673sx-adj
• Description: Simple Switcher 3a Step-down Voltage Regulator With Adjustable Current Limit
• Manufacturer: National Semiconductor Corporation

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