LM2574DW-3.3 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

LM2574DW-3.3

EASY SWITCHER™ 0.5 A STEP–DOWN VOLTAGE REGULATOR

Motorola => Freescale 

LM2574

40 V Max

Unregulated

DC Input

Cin

22 µF

Figure 35. 1.2 to 35 V Adjustable 500 mA Power Supply with Low Output Ripple

Feedback

+Vin

1

LM2574–ADJ

5

Output

L1

150 µH

L2

20 µH

Output

Voltage

7

4 Pwr 2 Sig 3 ON/OFF

Gnd Gnd

1.2 to 35 V @ 0.5 A

R2

50 k

D1

1N5819

Cout

1000 µF

R1

1.1 k

C1

100 µF

Optional Output

Ripple Filter

The LM2574–5 Step–Down Voltage Regulator with 5.0 V @ 0.5 A Output Power Capability.

Typical Application With Through–Hole PC Board Layout

Figure 36. Schematic Diagram of the LM2574–5 Step–Down Converter

Feedback

Unregulated

DC Input

+Vin = 7.0 to 40 V

+Vin

1

LM2574–5

5

Output

7

4 Pwr 2 Sig 3 ON/OFF

Gnd Gnd

L1

330 µH

Regulated Output

+Vout = 5.0 V @ 0.5 A

C1

22 µF

D1

1N5819

C2

220 µF

Gnd

Gnd

C1 – 22 µF, 63 V, Aluminium Electrolytic

C2 – 220 µF, 16 V, Aluminium Electrolytic

D1 – 1.0 A, 40 V, Schottky Rectifier, 1N5819

L1 – 330 µH, RL–1284–330, Renco Electronics

Figure 37. PC Board Layout Component Side

+

+Vin

C1

LM2574–5.0

U1

Gnd

C2

+

D1

L1

Vout

Gnd

NOTE: Not to scale.

Figure 38. PC Board Layout Copper Side

NOTE: Not to scale.

MOTOROLA ANALOG IC DEVICE DATA

21

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