3A, 52kHz, Step-Down Switching Regulator
ELECTRICAL CHARACTERISTICS
/ Device Parameters
LM2576
(Unless otherwise specified, Vin = 12V for the 3.3V, 5.0V, and Adjustable version, Vin = 25V for the 12V 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=5.0V [Adjustable Version Only])
T
J
=25℃
T
J
= -40 to +125℃
Oscillator Frequency [Note 3]
T
J
=25℃
T
J
= 0 to +125℃
T
J
= -40 to +125℃
Saturation Voltage (Iout=3.0A [note 4])
T
J
= 25℃
T
J
= -40 to +125℃
Max Duty Cycle (“0”) [Note 5]
Current Limit (Peak Current [Note 3 and 4])
T
J
= 25℃
T
J
= -40 to +125℃
Output Leakage Current [Note 6 and 7], T
J
=25℃
Output = 0V
Output = -1.0V
Quiescent Current [Note 6]
T
J
= 25℃
T
J
= -40 to +125℃
Standby Quiescent Current (ON/OFF Pin = 5.0V ("off"))
T
J
=25℃
T
J
= -40 to +125℃
ON/OFF Pin Logic Input Level (Test circuit Figure 15)
Vout=0V
T
J
=25℃
T
J
= -40 to +125℃
Vout=Nominal Output Voltage
T
J
=25℃
T
J
= -40 to +125℃
ON/OFF Pin Input Current (Test Circuit Figure 15)
ON/OFF Pin = 5.0V (Regulator OFF), T
J
=25℃
ON/OFF Pin = 0V (Regulator ON), T
J
=25℃
Symbol
MIN.
TYP.
MAX.
Unit
I
b
-
-
-
47
42
-
-
94
4.2
3.5
-
-
-
-
-
-
25
-
52
-
-
1.5
-
98
5.8
-
0.8
6
5
-
80
-
100
200
-
58
63
1.8
2
-
6.9
7.5
50
30
9
11
200
400
nA
F
OSC
kHz
V
SAT
DC
I
CL
I
L
I
Q
I
STBY
V
%
A
mA
mA
µA
V
IH
2.2
2.4
-
-
-
-
1.4
-
1.2
-
15
0
-
-
1
0.8
30
0.5
V
V
IL
I
IH
I
IL
V
µA
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 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 sourcing current. No diode, inductor or capacitor connected to output pin.
5. Feedback removed from output and connected to 0V.
6. Feedback removed from output and connected to +12V for the Adjustable, 3.3V, and 5.0V versions, and +25V for the 12V
version, to force the output transistor “off”.
7. Vin = 40V.
Dec 2011 – Rev. 1.3
-
7
-
HTC
HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
