LM2598S-ADJ/NOPB National Semiconductor, LM2598S-ADJ/NOPB Datasheet - Page 4
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LM2598S-ADJ/NOPB
Manufacturer Part Number
LM2598S-ADJ/NOPB
Description
IC REG SW ADJ 1A STP DN TO263-7
Manufacturer
National Semiconductor
Series
SIMPLE SWITCHER®r
Type
Step-Down (Buck)r
Datasheet
1.LM2598T-12NOPB.pdf
(33 pages)
Specifications of LM2598S-ADJ/NOPB
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.2 ~ 37 V
Current - Output
1A
Frequency - Switching
150kHz
Voltage - Input
4.5 ~ 40 V
Operating Temperature
-25°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
D²Pak, TO-263 (7 leads + tab)
Package
8TO-263
Minimum Input Voltage
4.5 V
Maximum Input Voltage
40 V
Switching Frequency
173 KHz
Operating Supply Voltage
4.5 to 40 V
Maximum Output Current
1 A
Output Type
Adjustable
Output Voltage
1.2 to 37 V
Efficiency
78(Typ) %
For Use With
551011367-011 - BOARD WEBENCH BUILD IT LM2598
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Other names
*LM2598S-ADJ
*LM2598S-ADJ/NOPB
LM2598S-ADJ
*LM2598S-ADJ/NOPB
LM2598S-ADJ
www.national.com
DEVICE PARAMETERS
I
f
V
DC
I
I
I
I
SHUTDOWN/SOFT-START CONTROL Test Circuit of Figure 1
V
V
Symbol
Symbol
SYSTEM PARAMETERS (Note 6) Test Circuit Figure 1
V
b
O
CL
L
Q
STBY
JC
JA
JA
JA
JA
Specifications with standard type face are for T
ture Range. Unless otherwise specified, V
sion. I
SAT
SD
SS
Specifications with standard type face are for T
ture Range.
FB
LM2598-ADJ
Electrical Characteristics
All Output Voltage Versions
Electrical Characteristics
LOAD
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
= 200 mA
Parameter
Parameter
4.5V
V
V
OUT
IN
= 12V, V
programmed for 3V. Circuit of Figure 12 .
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
IN
= 12V for the 3.3V, 5V, and Adjustable version and V
= 1A (Note 8) (Note 9)
= 20% of Nominal Output Voltage
= 100% of Nominal Output Voltage
OUT
J
40V, 0.1A
J
= 25˚C, and those with boldface type apply over full Operating Tempera-
= 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)
Typ
150
100
1.5
1.3
10
85
50
50
30
20
1
0
2
5
2
2
3
LM2598-XX
IN
= 24V for the 12V ver-
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