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

• 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

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

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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