LM2574 datasheet(4/26 Pages) ONSEMI

Teilenummer	LM2574

Bauteilbeschribung	0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator

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LM2574, NCV2574

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4

SYSTEM PARAMETERS ([Note 3] Test Circuit Figure 16)

ELECTRICAL CHARACTERISTICS (continued) (Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and

Adjustable version, Vin = 25 V for the 12 V version, Vin = 30 V for the 15 V version. ILoad = 100 mA. For typical values TJ = 25°C, for

min/max values TJ is the operating junction temperature range that applies [Note 4], unless otherwise noted).

Characteristic

Symbol

Min

Typ

Max

Unit

ALL OUTPUT VOLTAGE VERSIONS

Feedback Bias Current Vout = 5.0 V (Adjustable Version Only)

Ib

nA

TJ = 25°C

−

25

100

TJ = −40 to +125°C

−

200

Oscillator Frequency (Note 5)

fO

kHz

TJ = 25°C

−

52

−

TJ = 0 to +125°C

47

52

58

TJ = −40 to +125°C

42

−

63

Saturation Voltage (Iout = 0.5 A, [Note 6])

Vsat

V

TJ = 25°C

−

1.0

1.2

TJ = −40 to +125°C

−

1.4

Max Duty Cycle (“on”) (Note 7)

DC

93

98

−

%

Current Limit Peak Current (Notes 5 and 6)

ICL

A

TJ = 25°C

0.7

1.0

1.6

TJ = −40 to +125°C

0.65

−

1.8

Output Leakage Current (Notes 8 and 9), TJ = 25°C

IL

mA

Output = 0 V

−

0.6

2.0

Output = − 1.0 V

−

10

30

Quiescent Current (Note 8)

IQ

mA

TJ = 25°C

−

5.0

9.0

TJ = −40 to +125°C

−

11

Standby Quiescent Current (ON/OFF Pin = 5.0 V (“off”))

Istby

mA

TJ = 25°C

−

60

200

TJ = −40 to +125°C

−

400

ON/OFF Pin Logic Input Level

V

Vout = 0 V

VIH

TJ = 25°C

2.2

1.4

−

TJ = −40 to +125°C

2.4

−

Nominal Output Voltage

VIL

TJ = 25°C

−

1.2

1.0

TJ = −40 to +125°C

−

0.8

ON/OFF Pin Input Current

mA

ON/OFF Pin = 5.0 V (“off”), TJ = 25°C

IIH

−

15

30

ON/OFF Pin = 0 V (“on”), TJ = 25°C

IIL

−

0

5.0

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

When the LM2574 is used as shown in the Figure 16 test circuit, the system performance will be as shown in the system parameters section

of the Electrical Characteristics.

4. Tested junction temperature range for the LM2574, NCV2574: Tlow = −40°C Thigh = +125°C.

5. The oscillator frequency reduces to approximately 18 kHz in the event of an output short or an overload which causes the regulated output

voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of the

IC by lowering the minimum duty cycle from 5% down to approximately 2%.

6. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to the output pin.

7. Feedback (Pin 4) removed from output and connected to 0 V.

8. Feedback (Pin 4) removed from output and connected to 12 V for the Adjustable, 3.3 V, and 5.0 V versions, and 25 V for the 12 V and 15 V

versions, to force the output transistor OFF.

9. Vin = 40 V.

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