LM2576
DEVICE PARAMETERS
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, V
in
= 12 V for the 3.3 V, 5.0 V, and Adjustable version, V
in
= 25 V
for the 12 V version, and V
in
= 30 V for the 15 V version. I
Load
= 500 mA. For typical values T
J
= 25°C, for min/max values T
J
is the
operating junction temperature range that applies [Note 2], unless otherwise noted.)
Characteristics
ALL OUTPUT VOLTAGE VERSIONS
Feedback Bias Current (V
out
= 5.0 V Adjustable Version Only)
T
J
= 25°C
T
J
= −40 to +125°C
Oscillator Frequency Note 3
T
J
= 25°C
T
J
= 0 to +125°C
T
J
= −40 to +125°C
Saturation Voltage (I
out
= 3.0 A Note 4)
T
J
= 25°C
T
J
= −40 to +125°C
Max Duty Cycle (“on”) Note 5
Current Limit (Peak Current Notes 3 and 4)
T
J
= 25°C
T
J
= −40 to +125°C
Output Leakage Current Notes 6 and 7, T
J
= 25°C
Output = 0 V
Output = −1.0 V
Quiescent Current Note 6
T
J
= 25°C
T
J
= −40 to +125°C
Standby Quiescent Current (ON/OFF Pin = 5.0 V (“off”))
T
J
= 25°C
T
J
= −40 to +125°C
ON/OFF Pin Logic Input Level (Test Circuit Figure 15)
V
out
= 0 V
T
J
= 25°C
T
J
= −40 to +125°C
V
out
= Nominal Output Voltage
T
J
= 25°C
T
J
= −40 to +125°C
ON/OFF Pin Input Current (Test Circuit Figure 15)
ON/OFF Pin = 5.0 V (“off”), T
J
= 25°C
ON/OFF Pin = 0 V (“on”), T
J
= 25°C
I
b
−
−
f
osc
−
47
42
V
sat
−
−
DC
I
CL
4.2
3.5
I
L
−
−
I
Q
−
−
I
stby
−
−
V
IH
2.2
2.4
V
IL
−
−
I
IH
I
IL
−
−
1.2
−
15
0
1.0
0.8
mA
30
5.0
1.4
−
−
−
80
−
200
400
V
5.0
−
9.0
11
mA
0.8
6.0
2.0
20
mA
5.8
−
6.9
7.5
mA
94
1.5
−
98
1.8
2.0
−
%
A
52
−
−
−
58
63
V
25
−
100
200
kHz
nA
Symbol
Min
Typ
Max
Unit
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 5.0 V versions, and +25 V for the 12 V and
15 V versions, to force the output transistor “off”.
7. V
in
= 40 V.
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