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