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| 型号： | LM2574DW-ADJ |
| 厂商： | ON Semiconductor |
| 文件页数： | 4/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.5A 16SOICW |
| 产品变化通告： | Product Discontinuation 20/Aug/2008 |
| 标准包装： | 47 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.23 V ~ 37 V |
| 输入电压： | 4.75 V ~ 40 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 52kHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-SOIC W |
LM2574, NCV2574
SYSTEM PARAMETERS ([Note 3] Test Circuit Figure 16)
ELECTRICAL CHARACTERISTICS (continued) (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, V in = 30 V for the 15 V version. I Load = 100 mA. For typical values T J = 25 ° C, for
min/max values T J is the operating junction temperature range that applies [Note 4], unless otherwise noted).
Characteristic
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 5)
T J = 25 ° C
T J = 0 to +125 ° C
T J = ?40 to +125 ° C
Saturation Voltage (I out = 0.5 A, [Note 6])
T J = 25 ° C
T J = ?40 to +125 ° C
Max Duty Cycle (“on”) (Note 7)
Current Limit Peak Current (Notes 5 and 6)
T J = 25 ° C
T J = ?40 to +125 ° C
I b
f O
V sat
DC
I CL
?
?
?
47
42
?
?
93
0.7
0.65
25
?
52
52
?
1.0
?
98
1.0
?
100
200
?
58
63
1.2
1.4
?
1.6
1.8
nA
kHz
V
%
A
Output Leakage Current (Notes 8 and 9), T J = 25 ° C
I L
mA
Output = 0 V
Output = ? 1.0 V
?
?
0.6
10
2.0
30
Quiescent Current (Note 8)
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
I Q
I stby
?
?
?
?
5.0
?
60
?
9.0
11
200
400
mA
m A
ON/OFF Pin Logic Input Level
V
V out = 0 V
T J = 25 ° C
T J = ?40 to +125 ° C
Nominal Output Voltage
T J = 25 ° C
T J = ?40 to +125 ° C
V IH
V IL
2.2
2.4
?
?
1.4
?
1.2
?
?
?
1.0
0.8
ON/OFF P in Input Current
ON/OFF P in = 5.0 V (“off”), T J = 25 ° C
ON/OFF P in = 0 V (“on”), T J = 25 ° C
I IH
I IL
?
?
15
0
30
5.0
m A
3. External components such as the catch diode, inductor, input and output capacitors can affect the switching regulator system performance.
When the LM2574 is used as shown in the Figure 16 test circuit, the system performance will be as shown in the system parameters section
of the Electrical Characteristics.
4. Tested junction temperature range for the LM2574, NCV2574: T low = ?40 ° C T high = +125 ° C.
5. 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 power dissipation of the
IC by lowering the minimum duty cycle from 5% down to approximately 2%.
6. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to the output pin.
7. Feedback (Pin 4) removed from output and connected to 0 V.
8. 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.
9. V in = 40 V.
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