LM2576
DEVICE PARAMETERS
ELECTRICAL CHARACTERISTICS
(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.)
Characteristics
ALL OUTPUT VOLTAGE VERSIONS
Feedback Bias Current (Vout = 5.0 V [Adjustable Version Only])
TJ = 25°C
TJ = –40 to +125°C
Oscillator Frequency [Note 3]
TJ = 25°C
TJ = 0 to +125°C
TJ = –40 to +125°C
Saturation Voltage (Iout = 3.0 A [Note 4])
TJ = 25°C
TJ = –40 to +125°C
Max Duty Cycle (“on”) [Note 5]
Current Limit (Peak Current [Notes 3 and 4])
TJ = 25°C
TJ = –40 to +125°C
Output Leakage Current [Notes 6 and 7], TJ = 25°C
Output = 0 V
Output = –1.0 V
Quiescent Current [Note 6]
TJ = 25°C
TJ = –40 to +125°C
Standby Quiescent Current (ON/OFF Pin = 5.0 V (“off”))
TJ = 25°C
TJ = –40 to +125°C
ON/OFF Pin Logic Input Level (Test Circuit Figure 15)
Vout = 0 V
TJ = 25°C
TJ = –40 to +125°C
Vout = Nominal Output Voltage
TJ = 25°C
TJ = –40 to +125°C
ON/OFF Pin Input Current (Test Circuit Figure 15)
ON/OFF Pin = 5.0 V (“off”), TJ = 25°C
ON/OFF Pin = 0 V (“on”), TJ = 25°C
Ib
–
–
fosc
–
47
42
Vsat
–
–
DC
ICL
4.2
3.5
IL
–
–
IQ
–
–
Istby
–
–
VIH
2.2
2.4
VIL
–
–
IIH
IIL
–
–
1.2
–
15
0
1.0
0.8
µA
30
5.0
1.4
–
–
–
80
–
200
400
V
5.0
–
9.0
11
µA
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
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. Vin = 40 V.
4
MOTOROLA ANALOG IC DEVICE DATA
MOTOROLA [ MOTOROLA, INC ]
