L4978_05 datasheet(6/13 Pages) STMICROELECTRONICS

Part #	L4978

Description	2A STEP DOWN SWITCHING REGULATOR

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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L4978

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Figure 6. Quiescent drain current vs. input

voltage.

Figure 7. Quiescent current vs. junction

temperature

Figure 8. Stand by drain current vs. input

voltage.

Figure 9. Line Regulation

.

Figure 10. Load regulation

.

Figure 11. Switching frquency vs. R1 and C2

.

0

5 10 15 20 25 30 35 40 45 50

Vcc(V)

1

2

3

4

5

Iq

(mA)

200KHz

R1=22K

C2=1.2nF

0Hz

D97IN724

Tamb=25˚C

0% DC

100KHz

R1=20K

C2=2.7nF

-50 -30 -10 10 30 50 70 90 110

Tj(˚C)

1

2

3

4

5

Iq

(mA)

D97IN731

0Hz

200KHz

R1=22K

C2=1.2nF

VCC=35V

0% DC

100KHz

R1=20K

C2=2.7nF

0

5 10 15 20 25 30 35 40 45 50 VCC(V)

60

70

80

90

100

110

120

130

140

150

Ibias

(

µA)

D97IN732

Tj=25˚C

Tj=125˚C

Vss=GND

0

5 10 15 20 25 30 35 40 45 50 VCC(V)

3.370

3.371

3.372

3.373

3.374

3.375

3.376

3.377

VO

(V)

D97IN733

Tj=25˚C

Tj=125˚C

0

0.2 0.4 0.6

1.0 1.2 1.4 1.6

IO(A)

0.8

1.8

3.360

3.362

3.364

3.366

3.368

3.370

3.372

3.374

3.376

3.378

VO

(V)

Tj=25˚C

Tj=125˚C

VCC=35V

D98IN835

0

20

40

60

80

R1(K

Ω)

5

10

20

50

100

200

500

fsw

(KHz)

D97IN784

0.82nF

1.2nF

2.2nF

3.3nF

4.7nF

5.6nF

Tamb=25˚C

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