LM2673S-5.0 National Semiconductor, LM2673S-5.0 Datasheet - Page 4

• Manufacturer Part Number: LM2673S-5.0
• Description: DC/DC Converter IC
• Manufacturer: National Semiconductor

Specifications of LM2673S-5.0

• Input Voltage: 40V
• Output Current: 3A
• Output Voltage: 5V
• No. Of Pins: 7
• Termination Type: SMD
• Mounting Type: Through Hole
• Voltage Regulator Type: Switching
• Output Current Max: 3A
• Peak Reflow Compatible (260 C): No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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Symbol
DEVICE PARAMETERS
I
V
I
I
R
f
D
I
V
I
Q
CL
L
O
BIAS
SFST
JA
JA
JC
JA
JA
JA
JC
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings indicate conditions under which of the device is
guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test condition, see the electrical Char-
acteristics tables.
Note 2: ESD was applied using the human-body model, a 100pF capacitor discharged through a 1.5 k
Note 3: Typical values are determined with T
Note 4: All limits are guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100%
tested during production with T
ods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
Note 5: The peak switch current limit is determined by the following relationship: I
Note 6: Junction to ambient thermal resistance (no external heat sink) for the 7 lead TO-220 package mounted vertically, with
board with minimum copper area.
Note 7: Junction to ambient thermal resistance (no external heat sink) for the 7 lead TO-220 package mounted vertically, with
containing approximately 4 square inches of (1 oz.) copper area surrounding the leads.
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
3.3V, 5V and Adjustable versions and V
ADJ
SFST
DS(ON)
All Output Voltage Versions
Electrical Characteristics
Quiescent
Current
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
A
= T
J
= 25˚C. All limits at temperature extremes are guaranteed via correlation using standard standard Quality Control (SQC) meth-
V
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
SWITCH
FEEDBACK
FEEDBACK
IN
SWITCH
SWITCH
FEEDBACK
ADJ
= 40V, Softstart Pin = 0V
= 8.2K , (Note 5)
A
= T
= 3A
= 0V
= −1V
IN
J
= 8V
= 15V
= 1.3V
= 25˚C and represent the most likely norm.
=24V for the 12V version.
Conditions
A
= T
J
= 25˚C. Unless otherwise specified, R
4
CL
=37,125/ R
ADJ
.
1.21
0.15
0.63
Typ
260
4.2
4.5
1.0
3.7
91
85
65
45
56
35
26
resistor into each pin.
6
0
2
2
1.181/1.169
3.8/3.6
0.53
Min
225
ADJ
1
1
⁄
⁄
2
2
= 8.2K , V
inch leads soldered to a PC board
inch leads in a socket, or on a PC
1.229/1.246
0.17/0.29
5.25/5.4
Max
0.74
IN
280
1.5
6.9
15
6
=12V for the
Units
˚C/W
kHz
mA
mA
mA
nA
µA
++
%
%
V
A
V