LM2596

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2

Figure 1. Typical Application and Internal Block Diagram

12 V

Unregulated

DC Input

L1

33

mH

GND

+Vin

1

Cin

100

mF

3ON/OFF

5

Output

2

Feedback

4

D1

1N5822

Cout

220

mF

Typical Application (Adjustable Output Voltage Version)

Block Diagram

Unregulated

DC Input

+Vin

1

Cout

Feedback

4

Cin

L1

D1

R2

R1

Output

2

GND

3

ON/OFF

5

Reset

Latch

Thermal

Shutdown

150 kHz

Oscillator

1.235 V

Band-Gap

Reference

Freq

Shift

30 kHz

Comparator

Fixed Gain

Error Amplifier

Current

Limit

Driver

3.0 Amp

Switch

ON/OFF

3.1 V Internal

Regulator

Regulated

Output

Vout

Load

LM2596

5.0 V Regulated

Output 3.0 A Load

R1

R2

3.1k

1.0k

CFF

CFF

MAXIMUM RATINGS

Rating

Symbol

Value

Unit

Maximum Supply Voltage

Vin

45

V

ON/OFF Pin Input Voltage

−

−0.3 V ≤ V ≤ +Vin

V

Output Voltage to Ground (Steady−State)

−

−1.0

V

Power Dissipation

Case 314B and 314D (TO−220, 5−Lead)

PD

Internally Limited

W

Thermal Resistance, Junction−to−Ambient

RqJA

65

°C/W

Thermal Resistance, Junction−to−Case

RqJC

5.0

°C/W

Case 936A (D2PAK)

PD

Internally Limited

W

Thermal Resistance, Junction−to−Ambient

RqJA

70

°C/W

Thermal Resistance, Junction−to−Case

RqJC

5.0

°C/W

Storage Temperature Range

Tstg

−65 to +150

°C

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

−

2.0

kV

Lead Temperature (Soldering, 10 seconds)

−

260

°C

Maximum Junction Temperature

TJ

150

°C

Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality

should not be assumed, damage may occur and reliability may be affected.