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LM2598 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM2598
Description  SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator, with Features
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM2598 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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