December 2003

3

M9999-122303

LM2574

Micrel

Maximum Supply Voltage

LM2574 ..................................................................... 45V

OFF Pin Input Voltage ................................ –0.3V

≤ V ≤ V

IN

Output Voltage to Ground (Steady State) ..................... –1V

Power Dissipation .................................... Internally Limited

Storage Temperature Range (T

Minimum ESD Rating

C = 100pF, R = 1.5k

Ω ............................................... 2kV

FB Pin ....................................................................... 1kV

Lead Temperature (soldering, 10 sec.) ..................... 260

°C

Supply Voltage

LM2574 ..................................................................... 40V

Temperature Range

LM2574 ......................................... –40

°C ≤ T

Maximum Junction Temperature (T

Specifications with standard typeface are for T

Unless otherwise specified, V

Symbol

Parameter

Condition

Min

Typ

Max

Units

Figure 2

V

OUT

Feedback Voltage

V

1.217

1.230

1.243

V

V

OUT

Feedback Voltage

0.1A

≤ I

1.193

1.230

1.267

V

(LM2574)

V

1.180

1.280

V

η

Efficiency

V

78

%

Figure 3

V

OUT

Output Voltage

V

3.234

3.3

3.366

V

V

OUT

Output Voltage

0.1A

≤ I

3.168

3.3

3.432

V

(LM2574-3.3)

V

3.135

3.465

V

η

Efficiency

V

73

%

Figure 3

V

OUT

Output Voltage

V

4.900

5.0

5.100

V

V

OUT

Output Voltage

0.1A

≤ I

4.800

5.0

5.200

V

(LM2574-5.0)

V

4.750

5.250

V

η

Efficiency

V

78

%

Notes:

1.

intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see

“Electrical

Characteristics.”

2. All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100%

production tested. All limits at temperature extremes are guaranteed via testing.

3. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.

When the LM2574 is used as shown in Figure 1 test circuit, system performance will be shown in system parameters section of

“Electrical Charac-

teristics.”