LM2674LDX-3.3 National Semiconductor, LM2674LDX-3.3 Datasheet - Page 4

• Manufacturer Part Number: LM2674LDX-3.3
• Manufacturer: National Semiconductor

Specifications of LM2674LDX-3.3

• Dc To Dc Converter Type: Step Down
• Number Of Outputs: 1
• Pin Count: 16
• Input Voltage: 40V
• Output Voltage: 3.3V
• Switching Freq: 275KHz
• Output Current: 500mA
• Efficiency: 86%
• Package Type: LLP EP
• Output Type: Fixed
• Switching Regulator: Yes
• Mounting: Surface Mount
• Input Voltage (min): 8V
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Lead Free Status / Rohs Status: Not Compliant

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Symbol
η
DEVICE PARAMETERS
I
I
I
I
R
f
D
I
V
I
θ
Symbol
Q
STBY
CL
L
O
BIAS
S/D
JA
LM2674-ADJ
S/D
All Output Voltage Versions
Specifications with standard type face are for T
ture Range. Unless otherwise specified, V
sion, and I
DS(ON)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see
the Electrical Characteristics.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Note 3: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator
performance. When the LM2674 is used as shown in Figures 2, 3 test circuits, system performance will be as specified by the system parameters section of the
Electrical Characteristics.
Note 4: Typical numbers are at 25˚C and represent the most likely norm.
Note 5: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100%
production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used
to calculate Average Outgoing Quality Level (AOQL).
Note 6: Junction to ambient thermal resistance with approximately 1 square inch of printed circuit board copper surrounding the leads. Additional copper area will
lower thermal resistance further. See Application Information section in the application note accompanying this datasheet and the thermal model in LM267X Made
Simple (version 6.0) software. The value θ
thermal vias. For improved thermal resistance and power dissipation for the LLP package, refer to Application Note AN-1187.
Efficiency
Quiescent Current
Standby Quiescent
Current
Current Limit
Output Leakage Current
Switch On-Resistance
Oscillator Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Feedback Bias
Current
ON/OFF Pin
Voltage Thesholds
ON/OFF Pin Current
Thermal Resistance
LOAD
Parameter
= 100 mA.
Parameters
(Continued)
V
IN
= 12V, I
J−A
for the LLP (LD) package is specifically dependent on PCB trace area, trace material, and the number of layers and
V
For 3.3V, 5.0V, and ADJ Versions
V
For 12V Versions
ON/OFF Pin = 0V
V
V
V
I
Measured at Switch Pin
V
ADJ Version Only
ON/OFF Pin = 0V
N Package, Junction to Ambient (Note 6)
M Package, Junction to Ambient (Note 6)
SWITCH
FEEDBACK
FEEDBACK
IN
SWITCH
SWITCH
FEEDBACK
LOAD
= 40V, ON/OFF Pin = 0V
IN
= 12V for the 3.3V, 5V, and Adjustable versions and V
= 500 mA
Conditions
= 500 mA
J
= 0V
= −1V, ON/OFF Pin = 0V
= 25˚C, and those with bold type face apply over full Operating Tempera-
= 8V
= 15V
= 1.3V
Conditions
4
(Note 4)
Typ
90
0.25
Typ
260
105
2.5
2.5
0.8
1.4
50
95
85
20
95
1
6
0
(Note 5)
0.62/0.575
Min
Min
225
0.8
7
IN
= 24V for the 12V ver-
0.40/0.60
100/150
1.2/1.25
(Note 5)
Max
275
Max
3.6
2.0
25
15
37
Units
˚C/W
Units
kHz
mA
mA
mA
µA
µA
nA
µA
%
%
Ω
A
V
%