LM2576 datasheet(2/28 Pages) MOTOROLA

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LM2576

MOTOROLA ANALOG IC DEVICE DATA

Figure 1. Block Diagram and Typical Application

7.0 V – 40 V

Unregulated

DC Input

100

µH

Gnd

+Vin

Cin

100

µF

3ON/OFF

Output

Feedback

1N5822

Cout

1000

µF

Typical Application (Fixed Output Voltage Versions)

Representative Block Diagram and Typical Application

Unregulated

DC Input

+Vin

Cout

Feedback

Cin

1.0 k

Output

Gnd

ON/OFF

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

Vout

Load

Output

Voltage Versions

3.3 V

5.0 V

12 V

15 V

(

Ω)

1.7 k

3.1 k

8.84 k

11.3 k

For adjustable version

R1 = open, R2 = 0

Ω

LM2576

5.0 V Regulated

Output 3.0 A Load

ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond

which damage to the device may occur.)

Rating

Symbol

Value

Unit

Maximum Supply Voltage

Vin

ON/OFF Pin Input Voltage

–

–0.3 V

≤ V ≤ +Vin

Output Voltage to Ground (Steady–State)

–

–1.0

Power Dissipation

Case 314B and 314D (TO–220, 5–Lead)

Internally Limited

Thermal Resistance, Junction–to–Ambient

θJA

°C/W

Thermal Resistance, Junction–to–Case

θJC

5.0

°C/W

Case 936A (D2PAK)

Internally Limited

Thermal Resistance, Junction–to–Ambient

θJA

°C/W

Thermal Resistance, Junction–to–Case

θJC

5.0

°C/W

Storage Temperature Range

Tstg

–65 to +150

°C

Minimum ESD Rating (Human Body Model:

C = 100 pF, R = 1.5 k

Ω)

–

2.0

Lead Temperature (Soldering, 10 seconds)

–

260

°C

Maximum Junction Temperature

150

°C

NOTE: ESD data available upon request.

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