Datasheet

LM2599
SNVS123C –APRIL 1998–REVISED APRIL 2013 www.ti.com
All Output Voltage Versions Electrical Characteristics (continued)
Specifications with standard type face are for T
J
= 25°C, and those with boldface type apply over full Operating
Temperature Range. Unless otherwise specified, V
IN
= 12V for the 3.3V, 5V, and Adjustable version and V
IN
= 24V for the
12V version. I
LOAD
= 500 mA
Symbol Parameter Conditions LM2599-XX Units
(Limits)
Typ Limit
(1) (2)
I
STBY
Standby Quiescent SD /SS pin = 0V
(7)
80 μA
Current 200/250 μA(max)
θ
JC
Thermal Resistance TO220 or TO263 Package, Junction to Case 2 °C/W
θ
JA
TO220 Package, Juncton to Ambient
(8)
50 °C/W
θ
JA
TO263 Package, Juncton to Ambient
(9)
50 °C/W
θ
JA
TO263 Package, Juncton to Ambient
(10)
30 °C/W
θ
JA
TO263 Package, Juncton to Ambient
(11)
20 °C/W
SHUTDOWN/SOFT-START CONTROL Test Circuit of Figure 24
V
SD
Shutdown Threshold 1.3 V
Voltage Low, (Shutdown Mode) 0.6 V(max)
High, (Soft-start Mode) 2 V(min)
V
SS
Soft-start Voltage V
OUT
= 20% of Nominal Output Voltage 2 V
V
OUT
= 100% of Nominal Output Voltage 3
I
SD
Shutdown Current V
SHUTDOWN
= 0.5V 5 μA
10 μA(max)
I
SS
Soft-start Current V
Soft-start
= 2.5V 1.6 μA
5 μA(max)
FLAG/DELAY CONTROL Test Circuit of Figure 24
Regulator Dropout Detector Low (Flag ON) 96 %
Threshold Voltage 92 %(min)
98 %(max)
VF
SAT
Flag Output Saturation I
SINK
= 3 mA 0.3 V
Voltage V
DELAY
= 0.5V 0.7/1.0 V(max)
IF
L
Flag Output Leakage Current V
FLAG
= 40V 0.3 μA
Delay Pin Threshold 1.25 V
Voltage Low (Flag ON) 1.21 V(min)
High (Flag OFF) and V
OUT
Regulated 1.29 V(max)
Delay Pin Source Current V
DELAY
= 0.5V 3 μA
6 μA(max)
Delay Pin Saturation Low (Flag ON) 55 mV
350/400 mV(max)
(8) Junction to ambient thermal resistance (no external heat sink) for the package mounted TO-220 package mounted vertically, with the
leads soldered to a printed circuit board with (1 oz.) copper area of approximately 1 in
2
.
(9) Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 0.5 in
2
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 in
2
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 in
2
of (1 oz.)
copper area on the LM2599S side of the board, and approximately 16 in
2
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 4.2.1 (or later) software.
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