L4957A datasheet(4/7 Pages) STMICROELECTRONICS

Part #	L4957A

Description	UP TO 5A ULDO LINEAR REGULATOR

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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*P ulsed te cniq ue h as been used

-40

-2 0

0

204 06080

10 0 12 0 1 40 16 0

0

1

2

3

4

5

6

7

8

9

10

Tj [

°C]

O u tpu t C urre nt [A]

(Vin-Vou t) > 2V

pin 2 = G ND

Figure 3: Maximum Output Current vs. Junction

Temperature

Vin >2. 8 V

Tj=1 25 C

Tc =2 5

°C

Pd m a x = 40 W

Rd s o n

lim it

D C Operat ing A rea

P o w e r D is s ip at ion L im it

C urrent Lim it a t io n

Tc = 7 0

°C

Pd m a x = 22 W

0

12345

678

0

1

2

3

4

5

6

7

8

(V in - Vou t) [V ]

O u t put C ur r e n t [ A ]

Figure 4: DC Operating Area

0

10

20

30

40

50

60

70

80

90

10 0

F r eq u ency [ H z ]

Ripp le Re j e c t i o n [ d B ]

1k

1 0

10 0

1 0k

1 00k

V r ip pl e= 3V p- p V r ipple = 0.5 V p- p

C in = 22 uF

Co u t= 2 2 u F

Vo u t= 1 .5 V

Vin m in = 3 V

Io ut= 5 A

Figure 5: Ripple Rejection vs. Frequency

6.3

IOUT(A)

VOUT

(V)

D00IN1109

Figure 6: Output Voltage vs. Output Current.

(VOUT = 1.5V)

0

0 .2 0.4

0 .6 0.8

1

1.2 1 .4

1.6 1 .8

2

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

∆ V= V in - Vo

Io

[A ]

m a x i mu m R o n li mi ts

Tj = 1 0 0

°C

Tj = 1 2 5

°C

Tj = 2 5

°C

Figure 7: Maximum Output Current vs. Drop-Out

Voltage

L4957A

4/7

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