LM2574 datasheet(3/8 Pages) MICREL

3 / 8 page

December 2003

M9999-122303

LM2574

Micrel

Absolute Maximum Ratings(1)

Maximum Supply Voltage

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

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

≤ V ≤ V

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

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

Storage Temperature Range (T

S) ............ –65°C to +150°C

Minimum ESD Rating

C = 100pF, R = 1.5k

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

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

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

°C

Operating Ratings(1)

Supply Voltage

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

Temperature Range

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

°C ≤ T

J ≤ +125°C

Maximum Junction Temperature (T

J ............................... 150°C

Electrical Characteristics(2)

Specifications with standard typeface are for T

J = 25°C, and those with boldface type apply over full Operating Temperature Range.

Unless otherwise specified, V

IN = 12V, and ILOAD = 100mA.

Symbol

Parameter

Condition

Min

Typ

Max

Units

System Parameters, Adjustable Regulators(3), Test Circuit

Figure 2

OUT

Feedback Voltage

IN = 12V, ILOAD = 0.1A, VOUT = 5V

1.217

1.230

1.243

OUT

Feedback Voltage

0.1A

≤ I

LOAD ≤ 0.5A, 7V≤ VIN ≤ 40V,

1.193

1.230

1.267

(LM2574)

OUT = 5V

1.180

1.280

Efficiency

IN = 12V, ILOAD = 0.1A, VOUT = 5V

System Parameters, 3.3V Regulators(3), Test Circuit

Figure 3

OUT

Output Voltage

IN = 12V, ILOAD = 0.1A, VOUT = 3.3V

3.234

3.3

3.366

OUT

Output Voltage

0.1A

≤ I

LOAD ≤ 0.5A, 4.75V ≤ VIN ≤ 40V,

3.168

3.3

3.432

(LM2574-3.3)

OUT = 3.3V

3.135

3.465

Efficiency

IN = 12V, ILOAD = 0.1A

System Parameters, 5V Regulators(3), Test Circuit

Figure 3

OUT

Output Voltage

IN = 12V, ILOAD = 0.1A, VOUT = 5V

4.900

5.0

5.100

OUT

Output Voltage

0.1A

≤ I

LOAD ≤ 0.5A, 7V≤ VIN ≤ 40V,

4.800

5.0

5.200

(LM2574-5.0)

OUT = 5V

4.750

5.250

Efficiency

IN = 12V, ILOAD = 0.1A, VOUT = 5V

Notes:

“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

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.”

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