LM2672
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SNVS136K –SEPTEMBER 1998–REVISED APRIL 2013
All Output Voltage Versions (continued)
Specifications with standard type face are for TJ = 25°C, and those in 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
ON/OFF Pin
Conditions
Typ
Min
0.8
Max
2.0
Units
VS/D
1.4
V
Voltage Thesholds
IS/D
ON/OFF Pin Current
Synchronization Frequency
ON/OFF Pin = 0V
20
7
37
μA
FSYNC
VSYNC
VSYNC = 3.5V, 50% duty cycle
400
kHz
Synchronization Threshold
Voltage
1.4
V
VSS
ISS
Soft-Start Voltage
Soft-Start Current
Thermal Resistance
0.63
4.5
95
0.53
1.5
0.73
6.9
V
μA
θJA
PDIP Package, Junction to Ambient(1)
D Package, Junction to Ambient(1)
°C/W
105
(1) 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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