LT1933 Linear Technology, LT1933 Datasheet - Page 4

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LT1933

Manufacturer Part Number
LT1933
Description
600mA 500kHz Step-Down Switching Regulator in SOT-23
Manufacturer
Linear Technology
Datasheet

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LT1933
4
TYPICAL PERFOR A CE CHARACTERISTICS
700
600
500
400
300
200
100
8
7
6
5
4
0
Frequency Foldback
0.0
1
Typical Minimum Input Voltage
T
A
= 25°C
TO START
TO RUN
LOAD CURRENT (mA)
FB PIN VOLTAGE (V)
V
0.5
OUT
I
10
V
L
SW
200mA/DIV
10mV/DIV
10V/DIV
Operating Waveforms
V
L = 22µH, C
1.0
IN
100
= 12V, V
W
V
T
L = 33µH
OUT
A
= 25°C
OUT
= 5V
1933 G13
OUT
1933 G10
U
= 22µF
= 3.3V, I
1.5
OUT
= 400mA,
6.0
5.5
5.0
4.5
4.0
3.5
3.0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1
Soft-Start
Typical Minimum Input Voltage
0
T
DC = 30%
A
= 25°C
TO START
TO RUN
1933 G16
SHDN PIN VOLTAGE (V)
1
LOAD CURRENT (mA)
10
V
2
OUT
I
V
L
SW
200mA/DIV
10mV/DIV
10V/DIV
100
V
T
L = 22µH
A
3
OUT
= 25°C
Operating Waveforms,
Discontinuous Mode
V
L = 22µH, C
= 3.3V
IN
1933 G14
1933 G11
= 12V, V
4
OUT
OUT
= 22µF
= 3.3V, I
200
150
100
1.4
1.2
1.0
0.8
0.6
0.4
0.2
50
0
0
OUT
–50
SHDN Pin Current
0
Switch Current Limit
T
= 20mA,
A
= 25°C
–25
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4
SHDN PIN VOLTAGE (V)
0
TEMPERATURE (°C)
1933 G16
25
8
50
75
12
100
1933 G12
1933 G15
1933f
125
16

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