LM2575D2T-005 Datasheet, PDF (4/28 Pages) ON Semiconductor – 1.0 A, Adjustable Output Voltage, Step-Down

LM2575, NCV2575
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 = 200 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)
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 = 1.0 A Note 4)
T_J = 25°C
T_J = −40 to +125°C
Max Duty Cycle (“on”) Note 5
I_b
nA
−
25
100
−
−
200
f_osc
kHz
−
52
−
47
−
58
42
−
63
V_sat
V
−
1.0
1.2
−
−
1.3
DC
94
98
−
%
Current Limit (Peak Current Notes 4 and 3)
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
I_CL
A
1.7
2.3
3.0
1.4
−
3.2
I_L
mA
−
0.8
2.0
−
6.0
20
Quiescent Current Note 6
T_J = 25°C
T_J = −40 to +125°C
I_Q
mA
−
5.0
9.0
−
−
11
Standby Quiescent Current (ON/OFF Pin = 5.0 V (“off”))
T_J = 25°C
T_J = −40 to +125°C
I_stby
mA
15
80
200
−
−
400
ON/OFF Pin Logic Input Level (Test Circuit Figure 14)
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
V
V_IH
2.2
1.4
−
2.4
−
−
V_IL
−
1.2
1.0
−
−
0.8
ON/OFF Pin Input Current (Test Circuit Figure 14)
ON/OFF Pin = 5.0 V (“off”), T_J = 25°C
ON/OFF Pin = 0 V (“on”), T_J = 25°C
mA
I_IH
−
15
30
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.
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