lm2574dw ON Semiconductor, lm2574dw Datasheet - Page 2

• Manufacturer Part Number: lm2574dw
• Description: 0.5 A, Adjustable Output Voltage, Stepdown Switching Regulator
• Manufacturer: ON Semiconductor

Unregulated
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
NOTE: ESD data available upon request.
ABSOLUTE MAXIMUM RATINGS
Maximum Supply Voltage
ON/OFF Pin Input Voltage
Output Voltage to Ground (Steady State)
DW Suffix, Plastic Package Case 751G
Max Power Dissipation
N Suffix, Plastic Package Case 626
Max Power Dissipation
Storage Temperature Range
Minimum ESD Rating
Lead Temperature (Soldering, 10 seconds)
Maximum Junction Temperature
DC Input
Thermal Resistance, Junction−to−Air
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
(Human Body Model: C = 100 pF, R = 1.5 kW)
C
in
Feedback
Unregulated
Sig Gnd
7.0 − 40 V
DC Input
+V
(4)
5
1
2
in
(12)
(3)
22 mF
Rating
R2
R1
1.0 k
C
Band−Gap
Reference
Representative Block Diagram and Typical Application
in
1.235 V
Typical Application (Fixed Output Voltage Versions)
NOTE: Pin numbers in ( ) are for the SO−16W package.
Figure 1. Block Diagram and Typical Application
Fixed Gain
Error Amplifier
(Absolute Maximum Ratings indicate limits beyond which damage to the device may occur).
18 kHz
(12)
+V
Freq
Shift
in
5
2
(4)
Oscillator
52 kHz
Sig
Gnd
Comparator
3.1 V Internal
LM2574, NCV2574
Regulator
LM2574
4
http://onsemi.com
(6)
Pwr
Gnd
3
(5)
Reset
2
Latch
(14)
ON/OFF
(3)
Current
Limit
ON/OFF
Output
Feedback
1
7
Symbol
Shutdown
Driver
Thermal
R
R
R
T
V
P
P
T
qJA
qJA
qJC
−
−
stg
−
−
D1
1N5819
in
D
D
J
330 mH
L1
1.0 Amp
Switch
C
220 mF
out
−0.3 V ≤ V ≤ +V
Internally Limited
Internally Limited
−65°C to +150°C
(5)
(6)
ON/OFF
Output
Pwr Gnd
3
7
4
5.0 V Regulated
Output 0.5 A Load
(14)
Value
−1.0
145
100
260
150
5.0
2.0
45
Voltage Versions
For adjustable version
R1 = open, R2 = 0 W
in
D1
Output
3.3 V
5.0 V
12 V
15 V
L1
C
out
°C/W
°C/W
°C/W
Unit
°C
kV
°C
°C
W
W
V
V
V
8.84 k
11.3 k
1.7 k
3.1 k
(W)
R2
Load
V
out