Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Susceptibility
Human Body Model (Note 3)
Lead Temperature
2 kV
S Package
Vapor Phase (60 sec.)
Infrared (10 sec.)
+215˚C
+245˚C
+260˚C
+150˚C
Maximum Supply Voltage (VIN
)
45V
6V
SD/SS Pin Input Voltage (Note 2)
Delay Pin Voltage (Note 2)
Flag Pin Voltage
T Package (Soldering, 10 sec.)
Maximum Junction Temperature
1.5V
−0.3 ≤ V ≤ +45V
−0.3 ≤ V ≤ +25V
Feedback Pin Voltage
Output Voltage to Ground
(Steady State)
Operating Conditions
Temperature Range
Supply Voltage
−1V
Internally limited
−65˚C to +150˚C
−25˚C ≤ TJ ≤ +125˚C
Power Dissipation
4.5V to 40V
Storage Temperature Range
LM2598-3.3
Electrical Characteristics
Specifications with standard type face are for TJ = 25˚C, and those with boldface type apply over full Operating Tempera-
ture Range.
Symbol
Parameter
Conditions
LM2598-3.3
Limit
Units
(Limits)
Typ
(Note 4)
(Note 5)
SYSTEM PARAMETERS (Note 6) Test Circuit Figure 1
VOUT
Output Voltage
4.75V ≤ VIN ≤ 40V, 0.1A ≤ ILOAD ≤ 1A
3.3
78
V
3.168/3.135
3.432/3.465
V(min)
V(max)
%
η
Efficiency
VIN = 12V, ILOAD = 1A
LM2598-5.0
Electrical Characteristics
Specifications with standard type face are for TJ = 25˚C, and those with boldface type apply over full Operating Tempera-
ture Range.
Symbol
Parameter
Conditions
LM2598-5.0
Limit
Units
(Limits)
Typ
(Note 4)
(Note 5)
SYSTEM PARAMETERS (Note 6) Test Circuit Figure 1
VOUT
Output Voltage
7V ≤ VIN ≤ 40V, 0.1A ≤ ILOAD ≤ 1A
5
V
4.800/4.750
5.200/5.250
V(min)
V(max)
%
η
Efficiency
VIN = 12V, ILOAD = 1A
82
LM2598-12
Electrical Characteristics
Specifications with standard type face are for TJ = 25˚C, and those with boldface type apply over full Operating Tempera-
ture Range.
Symbol
Parameter
Conditions
LM2598-12
Units
(Limits)
Typ
Limit
(Note 4)
(Note 5)
SYSTEM PARAMETERS (Note 6) Test Circuit Figure 1
VOUT
Output Voltage
15V ≤ VIN ≤ 40V, 0.1A ≤ ILOAD ≤ 1A
12
90
V
11.52/11.40
12.48/12.60
V(min)
V(max)
%
η
Efficiency
VIN = 25V, ILOAD = 1A
3
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