LM2576

http://onsemi.com

2

Figure 1. Block Diagram and Typical Application

7.0 V − 40 V

Unregulated

DC Input

L1

100

mH

GN

D

1

100

mF

3ON/OFF

5

Output

2

Feedback

4

D1

1N5822

1000

mF

Typical Application (Fixed Output Voltage Versions)

Representative Block Diagram and Typical Application

Unregulated

DC Input

1

Feedback

4

L1

D1

R2

R1

1.0 k

Output

2

GND

3

ON/OFF

5

Reset

Latch

Thermal

Shutdown

52 kHz

Oscillator

1.235 V

Band−Gap

Reference

Freq

Shift

18 kHz

Comparator

Fixed Gain

Error Amplifier

Current

Limit

Driver

1.0 Amp

Switch

ON/OFF

3.1 V Internal

Regulator

Regulated

Output

Load

Output

Voltage Versions

3.3 V

5.0 V

12 V

15 V

R2

(

W)

1.7 k

3.1 k

8.84 k

11.3 k

For adjustable version

R1 = open, R2 = 0

W

LM2576

5.0 V Regulated

Output 3.0 A Load

This device contains 162 active transistors.

MAXIMUM RATINGS

Rating

Symbol

Value

Unit

Maximum Supply Voltage

45

V

ON/OFF Pin Input Voltage

−

−0.3 V

V

Output Voltage to Ground (Steady−State)

−

−1.0

V

Power Dissipation

Case 314B and 314D (TO−220, 5−Lead)

Internally Limited

W

Thermal Resistance, Junction−to−Ambient

65

°C/W

Thermal Resistance, Junction−to−Case

5.0

°C/W

Internally Limited

W

Thermal Resistance, Junction−to−Ambient

70

°C/W

Thermal Resistance, Junction−to−Case

5.0

°C/W

Storage Temperature Range

−65 to +150

°C

Minimum ESD Rating (Human Body Model: C = 100 pF, R = 1.5 k

W)

−

2.0

kV

Lead Temperature (Soldering, 10 seconds)

−

260

°C

Maximum Junction Temperature

150

°C

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.