4

Typical performance characteristics

(CIN = 1 µF; COUT = 10 µF, TJ = 25 °C unless otherwise specified.)

Figure 2. VK change vs. temperature (5 V version)

4.98

4.985

4.99

4.995

5

5.005

5.01

5.015

5.02

-55

-30

-5

20

45

70

95

120

145

Temperature [°C]

Ik = 10 µA

Ik = 1 mA

Ik = 15 mA

Figure 3. VK change vs. temperature (5 V version)

0

10

20

30

40

50

60

0

0.2

0.4

0.6

0.8

Vka rev (V)

Figure 4. IKmin minimum current for regulation

T = 25 °C, Ika increasing

0

2

4

6

8

10

12

14

16

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

5.5

6

Vka (V)

5 V version

Figure 5. Low frequency noise test

I

R = 20 µA

R

UP = 4.7 kΩ

R

LOAD = 50 Ω

Figure 6. Measured dynamic impedance

0.10

1.00

10.00

100.00

1,000.00

10,000.00

0.01

0.10

1.00

10.00

100.00

Frequency [kHz]

Ir = 20 µA Cout = 100 nF

Ir = 20 µA Cout = 0 µF

Ir = 100 µA Cout = 0 µF

Ir = 100 µA Cout = 220 nF

Ir = 1 mA Cout = 0 µF

IR = 20 µA, RUP = 4.7 kΩ, RLOAD = 50 Ω

Figure 7. Forward characteristics

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

0.01

0.1

1

10

100

IK (forward) [mA]

LM4040

Typical performance characteristics

DS13886 - Rev 2

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