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LT1933 参数 Datasheet PDF下载

LT1933图片预览
型号: LT1933
PDF下载: 下载PDF文件 查看货源
内容描述: 1.4A , 500kHz的降压型开关稳压器 [1.4A, 500kHz Step-Down Switching Regulator]
分类和应用: 稳压器开关
文件页数/大小: 20 页 / 321 K
品牌: LINER [ LINEAR TECHNOLOGY ]
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LT1936
TYPICAL PERFOR A CE CHARACTERISTICS
Minimum Input Voltage
8
V
OUT
= 5V
T
A
= 25°C
L = 15µH
TO START
INPUT VOLTAGE (V)
7
INPUT VOLTAGE (V)
TO START
5.0
4.5
4.0
3.5
TO RUN
SWITCH CURRENT LIMIT (A)
6
TO RUN
5
4
1
100
10
LOAD CURRENT (mA)
Switching Waveforms
V
SW
10V/DIV
I
L
500mA/DIV
V
OUT
20mV/DIV
V
IN
= 12V
V
OUT
= 3.3V
I
OUT
= 1A
L = 10µH
C
OUT
= 22µF
1µs/DIV
1936 G16
V
C
Voltages
2.5
2.0
VC VOLTAGE (V)
CURRENT LIMIT CLAMP
1.5
V
C
PIN CURRENT (µA)
1.0
SWITCHING THRESHOLD
0.5
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
1936 G18
U W
1000
1936 G13
Minimum Input Voltage
6.0
5.5
V
OUT
= 3.3V
T
A
= 25°C
L = 10µH
3.0
2.5
2.0
1.5
1.0
0.5
Switch Current Limit
3.0
0
10
100
LOAD CURRENT (mA)
1000
1936 G14
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
1936 G15
Switching Waveforms,
Discontinuous Mode
V
SW
10V/DIV
I
L
500mA/DIV
V
OUT
20mV/DIV
V
IN
= 12V
V
OUT
= 3.3V
I
OUT
= 50mA
L = 10µH
C
OUT
= 22µF
1µs/DIV
1936 G17
Error Amp Output Current
60
40
20
0
–20
–40
–60
T
A
= 25°C
V
C
= 0.5V
0
1
FB PIN VOLTAGE (V)
2
1936 G19
1936fa
5