Datasheet

LM2674
www.ti.com SNVS007F –SEPTEMBER 1998–REVISED APRIL 2013
All Output Voltage Versions
Specifications with standard type face are for T
J
= 25°C, and those with bold type face apply over full Operating
Temperature Range. Unless otherwise specified, V
IN
= 12V for the 3.3V, 5V, and Adjustable versions and V
IN
= 24V for the
12V version, and I
LOAD
= 100 mA.
Symbol Parameters Conditions Typ Min Max Units
DEVICE PARAMETERS
I
Q
Quiescent Current V
FEEDBACK
= 8V
2.5 3.6 mA
For 3.3V, 5.0V, and ADJ Versions
V
FEEDBACK
= 15V
2.5 mA
For 12V Versions
I
STBY
Standby Quiescent Current ON/OFF Pin = 0V 50 100/150 μA
I
CL
Current Limit 0.8 0.62/0.575 1.2/1.25 A
I
L
Output Leakage Current V
IN
= 40V, ON/OFF Pin = 0V
1 25 μA
V
SWITCH
= 0V
V
SWITCH
= −1V, ON/OFF Pin = 0V 6 15 mA
R
DS(ON)
Switch On-Resistance I
SWITCH
= 500 mA 0.25 0.40/0.60 Ω
f
O
Oscillator Frequency Measured at Switch Pin 260 225 275 kHz
D Maximum Duty Cycle 95 %
Minimum Duty Cycle 0 %
I
BIAS
Feedback Bias V
FEEDBACK
= 1.3V
85 nA
Current ADJ Version Only
V
S/D
ON/OFF Pin
Turn-On Threshold, Rising
(1)
1.4 0.8 2.0 V
Voltage Theshold
I
S/D
ON/OFF Pin Current ON/OFF Pin = 0V 20 7 37 μA
θ
JA
Thermal Resistance P Package, Junction to Ambient
(2)
95
°C/W
D Package, Junction to Ambient
(2)
105
(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 θ
J−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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