LT1930 Просмотр технического описания (PDF) - Linear Technology
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LT1930 Datasheet PDF : 12 Pages
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TYPICAL PERFOR A CE CHARACTERISTICS
Quiescent Current
7.0
NOT SWITCHING
6.5
6.0
5.5
LT1930A
5.0
4.5
LT1930
4.0
3.5
3.0
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
1930/A G01
Current Limit
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
10 20 30 40 50 60 70 80 90
DUTY CYCLE (%)
1930/A G04
FB Pin Voltage
1.28
1.27
1.26
1.25
1.24
1.23
1.22
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
1930/A G02
Switch Saturation Voltage
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0 0.2 0.4 0.6 0.8 1.0 1.2
SWITCH CURRENT (A)
1930/A G05
LT1930/LT1930A
SHDN Pin Current
90
80
LT1930A
70
60
50
40
30
LT1930
20
10
0
–10
0
1
2
3
4
5
6
SHDN PIN VOLTAGE (V)
1930/A G03
Oscillator Frequency
2.5
2.3
2.1
LT1930A
1.9
1.7
1.5
1.3
LT1930
1.1
0.9
0.7
0.5
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
1930/A G06
PI FU CTIO S
SW (Pin 1): Switch Pin. Connect inductor/diode here.
Minimize trace area at this pin to reduce EMI.
GND (Pin 2): Ground. Tie directly to local ground plane.
FB (Pin 3): Feedback Pin. Reference voltage is 1.255V.
Connect resistive divider tap here. Minimize trace area at
FB. Set VOUT according to VOUT = 1.255V(1 + R1/R2).
SHDN (Pin 4): Shutdown Pin. Tie to 2.4V or more to enable
device. Ground to shut down.
VIN (Pin 5): Input Supply Pin. Must be locally bypassed.
3
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