LM2575
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 = 200 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
Symbol
Min
Typ
Max
Unit
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 = 1.0 A [Note 4])
TJ = 25°C
TJ = –40 to +125°C
Max Duty Cycle (“on”) [Note 5]
Ib
fosc
Vsat
DC
nA
–
25
100
–
–
200
kHz
–
52
–
47
–
58
42
–
63
V
–
1.0
1.2
–
–
1.3
94
98
–
%
Current Limit (Peak Current [Notes 4 and 3])
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
ICL
A
1.7
2.3
3.0
1.4
–
3.2
IL
mA
–
0.8
2.0
–
6.0
20
Quiescent Current [Note 6]
TJ = 25°C
TJ = –40 to +125°C
IQ
mA
–
5.0
9.0
–
–
11
Standby Quiescent Current (ON/OFF Pin = 5.0 V (“off”))
TJ = 25°C
TJ = –40 to +125°C
Istby
µA
–
80
200
–
–
400
ON/OFF Pin Logic Input Level (Test Circuit Figure 14)
Vout = 0 V
TJ = 25°C
TJ = –40 to +125°C
Vout = Nominal Output Voltage
TJ = 25°C
TJ = –40 to +125°C
V
VIH
2.2
1.4
–
2.4
–
–
VIL
–
1.2
1.0
–
–
0.8
ON/OFF Pin Input Current (Test Circuit Figure 14)
ON/OFF Pin = 5.0 V (“off”), TJ = 25°C
ON/OFF Pin = 0 V (“on”), TJ = 25°C
µA
IIH
–
15
30
IIL
–
0
5.0
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