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Electrical Characteristics

LM2575

1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR

SLVS569E – JANUARY 2005 – REVISED JANUARY 2006

I

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

25

°C

1.217

1.23

1.243

Feedback voltage

25

°C

1.193

1.23

1.267

V

8 V

≤ V

0.2 A

≤ I

Full range

1.18

1.28

η

Efficiency

25

°C

77

%

25

°C

50

100

Feedback bias current

nA

Full range

500

25

°C

47

52

58

kHz

Full range

42

63

25

°C

0.9

1.2

Saturation voltage

V

Full range

1.4

25

°C

93

98

%

25

°C

1.7

2.8

3.6

A

Full range

1.3

4

2

Output leakage current

25

°C

mA

7.5

30

25

°C

5

10

mA

Standby quiescent current

OFF (ON/OFF pin = 5 V)

25

°C

50

200

µA

25

°C

2.2

1.4

Full range

2.4

ON/OFF logic input level

V

25

°C

1.2

1

Full range

0.8

OFF (ON/OFF pin = 5 V)

12

30

ON/OFF input current

25

°C

µA

ON (ON/OFF pin = 0 V)

0

10

(1)

In the event of an output short or an overload condition, self-protection features lower the oscillator frequency to

∼18 kHz and the

minimum duty cycle from 5% to

∼2%. The resulting output voltage drops to ∼40% of its nominal value, causing the average power

dissipated by the IC to lower.

(2)

Output is not connected to diode, inductor, or capacitor. Output is sourcing current.

(3)

Feedback is disconnected from output and connected to 0 V.

(4)

To force the output transistor off, FEEDBACK is disconnected from output and connected to 12 V.

3