3.0A, 52kHz, Step-Down Switching Regulator

LM2576

All Output Voltage Versions

㎂

47

-

58

%

A

mA

nA

kHz

V

㎂

11

50

30

6.9

9

Min

TYP

94

98

1.5

42

-

-52

Max Duty Cycle ("0") [Note 5]

DC

mA

-

7.5

-

Output = -1.0V

-

2

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

1.8

-

ON/OFF Pin = 0V (Regulator ON), TJ=25℃

-

0

5.0

ON/OFF Pin = 5.0V (Regulator OFF), TJ=25℃

-15

30

ON/OFF Pin Input Current (Test Circuit Figure 15)

1

-

-

0.8

-

1.2

-

Vout=Nominal Output Voltage

-

2.4

-

2.2

1.4

Vout=0V

400

ON/OFF Pin Logic Input Level (Test circuit Figure 15)

--

-

80

200

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

--

-5

Quiescent Current [Note 6]

6

Output = 0V

-

0.8

3.5

5.8

Current Limit (Peak Current [Note 3 and 4])

4.2

63

--

Vsat

-

Saturation Voltage (Iout=3.0A [note 4])

--

Fosc

Unit

Max

Characteristics

Symbol

HTC

- 4 -

-

25

100

200

Oscillator Frequency [Note 3]

V

V

(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, and Vin = 30 V for the 15 V version. ILoad = 500 mA. For typical values TJ = 25°C, for min/max

values TJ is the operating junction temperature range that applies [Note 2], unless otherwise noted.)

3. 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 dissipation of the IC by lowering the minimum duty cycle from 5% down to

approximately

2%.

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

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

6. Feedback (Pin 4) removed from output and connected to +12 V for the Adjustable, 3.3 V, and

5.0V ersions, and +25 V for the 12 V and15 V versions, to force the output transistor “off”.

7. Vin = 40 V.