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LT1933 Datasheet(PDF) 5 Page - Linear Technology

Part # LT1933
Description  600mA, 500kHz Step-Down Switching Regulator in SOT-23 and DFN Packages
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1933 Datasheet(HTML) 5 Page - Linear Technology

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LT1933
5
1933fe
TYPICAL PERFORMANCE CHARACTERISTICS
Frequency Foldback
Soft-Start
SHDN Pin Current
Typical Minimum Input Voltage
Typical Minimum Input Voltage
Switch Current Limit
Operating Waveforms
Operating Waveforms,
Discontinuous Mode
FB PIN VOLTAGE (V)
0.0
700
600
300
100
400
500
200
0
0.5
1933 G10
1.0
1.5
TA = 25°C
SHDN PIN VOLTAGE (V)
0
1.4
1.2
0.6
0.2
0.8
1.0
0.4
0
1
1933 G11
234
TA = 25°C
DC = 30%
0
200
150
50
100
0
4
1933 G12
812
16
SHDN PIN VOLTAGE (V)
TA = 25°C
LOAD CURRENT (mA)
5
6
7
8
1933 G13
4
VOUT = 5V
TA = 25°C
L = 33μH
TO START
TO RUN
1
10
100
LOAD CURRENT (mA)
4.5
5.0
5.5
6.0
1933 G14
3.0
3.5
4.0
VOUT = 3.3V
TA = 25°C
L = 22μH
TO START
TO RUN
1
10
100
TEMPERATURE (°C)
–50
1.4
1.2
1.0
0.6
0
0.2
0.8
0.4
–25
0
25
1933 G15
50
75
100
150
125
VIN = 12V, VOUT = 3.3V, IOUT = 400mA,
L = 22μH, COUT = 22μF
1933 G16
VOUT 10mV/DIV
IL 200mA/DIV
VOUT1
1.8V
VOUT2
1.2V
VSW 10V/DIV
VIN = 12V, VOUT = 3.3V, IOUT = 20mA,
L = 22μH, COUT = 22μF
1933 G17
VOUT 10mV/DIV
IL 200mA/DIV
VOUT1
1.8V
VOUT2
1.2V
VSW 10V/DIV



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