參數(shù)資料
型號： LM2576-12
廠商： Motorola, Inc.
英文描述： Easy Switcher 3.0A Step-Down Voltage Regulator
中文描述： 輕松切換3.0A的降壓穩(wěn)壓器
文件頁數(shù)： 4/28頁
文件大小： 301K
代理商： LM2576-12
LM2576
4
MOTOROLA ANALOG IC DEVICE DATA
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
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 = 3.0 A [Note 4])
TJ = 25
°
C
TJ = –40 to +125
°
C
Max Duty Cycle (“on”) [Note 5]
Ib
nA
–
–
25
–
100
200
fosc
kHz
–
47
42
52
–
–
–
58
63
Vsat
V
–
–
1.5
–
1.8
2.0
DC
94
98
–
%
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
ICL
A
4.2
3.5
5.8
–
6.9
7.5
IL
mA
–
–
0.8
6.0
2.0
20
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
IQ
mA
–
–
5.0
–
9.0
11
Istby
μ
A
–
–
80
–
200
400
V
VIH
2.2
2.4
1.4
–
–
–
VIL
–
–
1.2
–
1.0
0.8
μ
A
IIH
IIL
–
–
15
0
30
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.
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