參數(shù)資料
型號(hào)： LM2576D2T-12
廠商： MOTOROLA INC
元件分類： 穩(wěn)壓器
英文描述： EASY SWITCHERE⑩ 3.0 A STEP-DOWN VOLTAGE REGULATOR
中文描述： 3 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5
封裝： PLASTIC, D2PAK-5
文件頁(yè)數(shù)： 4/26頁(yè)
文件大小： 278K
代理商： LM2576D2T-12
LM2576
http://onsemi.com
4
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
= 500 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
I
b
nA
25
100
200
Oscillator Frequency Note 3
T
J
= 25
°
C
T
J
= 0 to +125
°
C
T
J
= 40 to +125
°
C
Saturation Voltage (I
out
= 3.0 A Note 4)
T
J
= 25
°
C
T
J
= 40 to +125
°
C
Max Duty Cycle (“on”) Note 5
f
osc
kHz
47
42
52
58
63
V
sat
V
1.5
1.8
2.0
DC
94
98
%
Current Limit (Peak Current Notes 3 and 4)
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
4.2
3.5
5.8
6.9
7.5
I
L
mA
0.8
6.0
2.0
20
Quiescent Current Note 6
T
J
= 25
°
C
T
J
= 40 to +125
°
C
Standby Quiescent Current (ON/OFF Pin = 5.0 V (“off”))
T
J
= 25
°
C
T
J
= 40 to +125
°
C
ON/OFF Pin Logic Input Level (Test Circuit Figure 15)
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
I
Q
mA
5.0
9.0
11
I
stby
A
80
200
400
V
V
IH
2.2
2.4
1.4
V
IL
1.2
1.0
0.8
ON/OFF Pin Input Current (Test Circuit Figure 15)
ON/OFF Pin = 5.0 V (“off”), T
J
= 25
°
C
ON/OFF Pin = 0 V (“on”), T
J
= 25
°
C
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.
A
I
IH
I
IL
15
0
30
5.0
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參數(shù)描述
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