July 2005

3

M9999-072805

LM2574

Micrel, Inc.

Maximum Supply Voltage

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

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

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

Minimum ESD Rating

C = 100pF, R = 1.5kΩ................................................ 2kV

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

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

Supply Voltage

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

Temperature Range

Symbol

Parameter

Condition

Min

Typ

Max

Units

Feedback Voltage

1.217

1.230

1.243

V

Feedback Voltage

1.193

1.230

1.267

V

(LM2574)

1.180

1.280

V

η

Efficiency

78

%

Output Voltage

3.234

3.3

3.366

V

Output Voltage

3.168

3.3

3.432

V

(LM2574-3.3)

3.135

3.465

V

η

Efficiency

73

%

Output Voltage

4.900

5.0

5.100

V

Output Voltage

4.800

5.0

5.200

V

(LM2574-5.0)

4.750

5.250

V

η

Efficiency

78

%

Notes:

1. “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. “Operating Ratings” indicate for which the device is

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

teristics.”

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.”