LM2574
Typical Application
(Fixed Output Voltage Versions)
7.0 - 40 V
Unregulated
DC Input
(3)
LM2574
(14)
2
(4)
Sig
Gnd
4
(6)
Pwr 3
Gnd
(5)
Feedback
1
Output
L1
330
µH
D1
1N5819
C
out
220
µF
+V
in
C
in
22
µF
5
(12)
7
ON/OFF
5.0 V Regulated
Output 0.5 A Load
Representative Block Diagram and Typical Application
+V
in
C
in
5
1
Feedback
R2
Fixed Gain
Error Amplifier Comparator
Freq
Shift
18 kHz
52 kHz
Oscillator
(12)
(3)
Current
Limit
Driver
Latch
1.0 Amp
Switch
Output
7 (14)
Pwr Gnd
4
(6)
D1
L1
C
out
Load
V
out
ON/OFF
3
(5)
Unregulated
DC Input
3.1 V Internal
Regulator
ON/OFF
Output
Voltage Versions
3.3 V
5.0 V
12 V
15 V
For adjustable version
R1 = open, R2 = 0
Ω
R2
(Ω)
1.7 k
3.1 k
8.84 k
11.3 k
R1
1.0 k
Sig Gnd
2
(4)
1.235 V
Band-Gap
Reference
Reset
Thermal
Shutdown
NOTE: Pin numbers in ( ) are for the SO–16W package.
Figure 1. Block Diagram and Typical Application
ABSOLUTE MAXIMUM RATINGS
(Absolute Maximum Ratings indicate limits beyond which damage to the device may occur).
Rating
Maximum Supply Voltage
ON/OFF Pin Input Voltage
Output Voltage to Ground (Steady State)
DW Suffix, Plastic Package Case 751G
Max Power Dissipation
Thermal Resistance, Junction–to–Air
N Suffix, Plastic Package Case 626
Max Power Dissipation
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
Storage Temperature Range
Minimum ESD Rating
(Human Body Model: C = 100 pF, R = 1.5 kΩ)
Lead Temperature (Soldering, 10 seconds)
Maximum Junction Temperature
NOTE: ESD data available upon request.
–
T
J
260
150
°C
°C
Symbol
V
in
–
–
P
D
R
θJA
P
D
R
θJA
R
θJC
T
stg
–
Value
45
–0.3 V
≤
V
≤
+V
in
–1.0
Internally Limited
145
Internally Limited
100
5.0
–65°C to +150°C
2.0
Unit
V
V
V
W
°C/W
W
°C/W
°C/W
°C
kV
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