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