LM2596
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SNVS124C –NOVEMBER 1999–REVISED APRIL 2013
All Output Voltage Versions Electrical Characteristics (continued)
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating
Temperature Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable version and VIN = 24V for the
12V version. ILOAD = 500 mA
LM2596-XX
Units
Symbol
ISTBY
Parameter
Conditions
Typ
Limit
(Limits)
(1)
(2)
(7)
Standby Quiescent Current
ON/OFF pin = 5V (OFF)
80
μA
μA(max)
°C/W
°C/W
°C/W
°C/W
°C/W
200/250
θJC
θJA
θJA
θJA
θJA
Thermal Resistance
TO-220 or TO-263 Package, Junction to Case
2
(8)
TO-220 Package, Junction to Ambient
50
50
30
20
(9)
TO-263 Package, Junction to Ambient
(10)
TO-263 Package, Junction to Ambient
(11)
TO-263 Package, Junction to Ambient
ON/OFF CONTROL Test Circuit Figure 20
ON /OFF Pin Logic Input
1.3
V
VIH
VIL
IH
Threshold Voltage
Low (Regulator ON)
0.6
2.0
V(max)
V(min)
μA
High (Regulator OFF)
ON /OFF Pin Input Current
VLOGIC = 2.5V (Regulator OFF)
5
15
5
μA(max)
μA
IL
VLOGIC = 0.5V (Regulator ON)
0.02
μA(max)
(8) Junction to ambient thermal resistance (no external heat sink) for the TO-220 package mounted vertically, with the leads soldered to a
printed circuit board with (1 oz.) copper area of approximately 1 in2.
(9) Junction to ambient thermal resistance with the TO-263 package tab soldered to a single printed circuit board with 0.5 in2 of (1 oz.)
copper area.
(10) Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 2.5 in2 of (1
oz.) copper area.
(11) Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided printed circuit board with 3 in2 of (1 oz.)
copper area on the LM2596S side of the board, and approximately 16 in2 of copper on the other side of the p-c board. See Application
Information in this data sheet and the thermal model in Switchers Made Simple™ version 4.3 software.
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