CYStech Electronics Corp.

Spec. No. : C543E5/F5

Issued Date : 2004.02.27

Revised Date :2007.12.13

Page No. : 5/12

LM2576-XXE5/F5

CYStek Product Specification

All Output Voltage Versions Electrical Characteristics

Symbol

Parameter

Conditions

Typ

Min

Max

Units

Ib

-

100/500

nA

Oscillator frequency

(Note 8)

52

47/42

58/63

kHz

Saturation voltage

1.4

-

1.8/2.0

V

DC

Maximum duty cycle

(ON)

(Note 5)

98

93

-

%

Current limit

(Notes 4, 8)

5.8

4.2/3.5

6.9/7.5

A

Output leakage current

(Notes 6, 7) Output = 0V

Output = -1V

-

7.5

-

-

2

30

mA

Quiescent current

(Note 6)

5

-

10

mA

Standby quiescent

current

ON/OFF pin=5V (OFF)

50

-

200

μA

ON/OFF Control

1.4

2.2/2.4

-

V

ON/OFF pin logic

input level

1.2

-

1.0/0.8

V

ON/OFF pin=5V (OFF)

12

-

30

μA

ON/OFF pin input

current

ON/OFF pin=0V (ON)

0

-

10

μA

Note 1 :

Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate

conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For

guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2 :

All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face).

Note 3 :

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

system performance. When the LM2576 is used as shown in the figure 2 test circuit, system performance will be as

shown in system parameters section of Electrical Characteristics.

Note 4 :

Output pin sourcing current. No diode, inductor or capacitor connected to output.

Note 5 :

Feedback pin removed from output and connected to 0V.

Note 6 :

Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V, and 5V versions, and +25V for

the 12V and 15V versions, to force the output transistor OFF.

Note 7 :

Note 8 :

The oscillator frequency reduces to approximately 11 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%.