LM2598S-ADJ National Semiconductor, LM2598S-ADJ Datasheet - Page 4

• Manufacturer Part Number: LM2598S-ADJ
• Description: SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator/ with Features
• Manufacturer: National Semiconductor

www.national.com
DEVICE PARAMETERS
I
f
V
DC
I
I
I
I
SHUTDOWN/SOFT-START CONTROL Test Circuit of Figure 1
V
V
SYSTEM PARAMETERS (Note 6) Test Circuit Figure 1
V
Symbol
Symbol
b
O
CL
L
Q
STBY
JC
JA
JA
JA
JA
Specifications with standard type face are for T
Range. Unless otherwise specified, V
I
SAT
SD
SS
LM2598-ADJ
Electrical Characteristics
Specifications with standard type face are for T
ture Range.
All Output Voltage Versions
Electrical Characteristics
LOAD
FB
= 200 mA
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Max Duty Cycle (ON)
Min Duty Cycle (OFF)
Current Limit
Output Leakage Current
Operating Quiescent
Current
Standby Quiescent
Current
Thermal Resistance
Shutdown Threshold
Voltage
Soft-start Voltage
Feedback Voltage
Efficiency
Parameter
Parameter
4.5V
V
V
OUT
IN
IN
= 12V, V
programmed for 3V. Circuit of Figure 12 .
= 12V for the 3.3V, 5V, and Adjustable version and V
Adjustable Version Only, V
(Note 7)
I
(Note 9)
(Note 10)
Peak Current, (Note 8) (Note 9)
Output = 0V (Note 9) (Note 10) (Note 11)
Output = −1V
SD /SS Pin Open, (Note 10)
SD /SS pin = 0V, (Note 11)
TO220 or TO263 Package, Junction to Case
TO220 Package, Junction to Ambient (Note 12)
TO263 Package, Junction to Ambient (Note 13)
TO263 Package, Junction to Ambient (Note 14)
TO263 Package, Junction to Ambient (Note 15)
Low, (Shutdown Mode)
High, (Soft-start Mode)
V
V
V
OUT
OUT
OUT
IN
= 1A (Note 8) (Note 9)
J
= 20% of Nominal Output Voltage
= 100% of Nominal Output Voltage
OUT
40V, 0.1A
J
= 25˚C, and those with boldface type apply over full Operating Temperature
= 25˚C, and those with boldface type apply over full Operating Tempera-
= 3V, I
Conditions
LOAD
Conditions
I
LOAD
4
= 1A
FB
1A
= 1.3V
(Note 4)
1.230
Typ
78
LM2598-ADJ
(Note 4)
IN
Typ
150
100
1.5
1.3
10
85
50
50
30
20
= 24V for the 12V version.
1
0
2
5
2
2
3
LM2598-XX
1.193/1.180
1.267/1.280
(Note 5)
Limit
(Note 5)
127/110
173/173
1.2/1.15
200/250
50/100
1.2/1.3
2.4/2.6
Limit
0.6
50
15
10
2
kHz(max)
(Limits)
kHz(min)
mA(max)
mA(max)
nA(max)
µA(max)
µA(max)
V(max)
(Limits)
V(min)
V(max)
A(max)
V(max)
Units
A(min)
V(min)
Units
˚C/W
˚C/W
˚C/W
˚C/W
˚C/W
kHz
mA
mA
%
nA
µA
V
%
V
A
V
V