LM2576
http://onsemi.com
4
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 Symbol Min Typ Max Unit
ALL OUTPUT VOLTAGE VERSIONS
Feedback Bias Current (V
out
= 5.0 V Adjustable Version Only) I
b
nA
T
J
= 25°C − 25 100
T
J
= −40 to +125°C − − 200
Oscillator Frequency Note 3 f
osc
kHz
T
J
= 25°C − 52 −
T
J
= 0 to +125°C 47 − 58
T
J
= −40 to +125°C 42 − 63
Saturation Voltage (I
out
= 3.0 A Note 4) V
sat
V
T
J
= 25°C − 1.5 1.8
T
J
= −40 to +125°C − − 2.0
Max Duty Cycle (“on”) Note 5 DC 94 98 − %
Current Limit (Peak Current Notes 3 and 4) I
CL
A
T
J
= 25°C 4.2 5.8 6.9
T
J
= −40 to +125°C 3.5 − 7.5
Output Leakage Current Notes 6 and 7, T
J
= 25°C I
L
mA
Output = 0 V − 0.8 2.0
Output = −1.0 V − 6.0 20
Quiescent Current Note 6 I
Q
mA
T
J
= 25°C − 5.0 9.0
T
J
= −40 to +125°C − − 11
Standby Quiescent Current (ON/OFF Pin = 5.0 V (“off”)) I
stby
mA
T
J
= 25°C − 80 200
T
J
= −40 to +125°C − − 400
ON/OFF Pin Logic Input Level (Test Circuit Figure 15) V
V
out
= 0 V V
IH
T
J
= 25°C 2.2 1.4 −
T
J
= −40 to +125°C 2.4 − −
V
out
= Nominal Output Voltage V
IL
T
J
= 25°C − 1.2 1.0
T
J
= −40 to +125°C − − 0.8
ON/OFF Pin Input Current (Test Circuit Figure 15)
mA
ON/OFF Pin = 5.0 V (“off”), T
J
= 25°C I
IH
− 15 30
ON/OFF Pin = 0 V (“on”), T
J
= 25°C I
IL
− 0 5.0
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.
