LM2674
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SNVS007F –SEPTEMBER 1998–REVISED APRIL 2013
All Output Voltage Versions
Specifications with standard type face are for TJ = 25°C, and those with bold type face apply over full Operating
Temperature Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable versions and VIN = 24V for the
12V version, and ILOAD = 100 mA.
Symbol
Parameters
Conditions
Typ
Min
Max
Units
DEVICE PARAMETERS
IQ
Quiescent Current
VFEEDBACK = 8V
For 3.3V, 5.0V, and ADJ Versions
2.5
2.5
3.6
mA
mA
VFEEDBACK = 15V
For 12V Versions
ISTBY
ICL
Standby Quiescent Current
Current Limit
ON/OFF Pin = 0V
50
100/150
1.2/1.25
μA
0.8
0.62/0.575
A
IL
Output Leakage Current
VIN = 40V, ON/OFF Pin = 0V
VSWITCH = 0V
1
25
μA
VSWITCH = −1V, ON/OFF Pin = 0V
ISWITCH = 500 mA
6
0.25
260
95
15
0.40/0.60
275
mA
Ω
RDS(ON)
Switch On-Resistance
Oscillator Frequency
Maximum Duty Cycle
Minimum Duty Cycle
fO
D
Measured at Switch Pin
225
kHz
%
0
%
IBIAS
VS/D
Feedback Bias
Current
VFEEDBACK = 1.3V
ADJ Version Only
85
nA
ON/OFF Pin
Voltage Theshold
Turn-On Threshold, Rising(1)
1.4
20
0.8
7
2.0
37
V
IS/D
ON/OFF Pin Current
Thermal Resistance
ON/OFF Pin = 0V
P Package, Junction to Ambient(2)
D Package, Junction to Ambient(2)
μA
θJA
95
105
°C/W
(1) The ON/OFF pin is internally pulled up to 7V and can be left floating for always-on operation.
(2) 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 θJ−A for the WSON (NHN) package is
specifically dependent on PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal resistance
and power dissipation for the WSON package, refer to Application Note AN-1187.
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