LT1374CFE 데이터 시트보기 (PDF) - Linear Technology
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LT1374CFE Datasheet PDF : 32 Pages
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LT1374
ELECTRICAL CHARACTERISTICS
Note 5: Boost current is the current flowing into the boost pin with the pin
held 5V above input voltage. It flows only during switch on time.
Note 6: VIN supply current is the current drawn when the BIAS pin is held
at 5V and switching is disabled. If the BIAS pin is unavailable or open
circuit, the sum of VIN and BIAS supply currents will be drawn by the VIN
pin.
Note 7: Switch on resistance is calculated by dividing VIN to VSW voltage
by the forced current (4.5A). See Typical Performance Characteristics for
the graph of switch voltage at other currents.
Note 8: Transconductance and voltage gain refer to the internal amplifier
exclusive of the voltage divider. To calculate gain and transconductance,
refer to the SENSE pin on the fixed voltage parts. Divide values shown by
the ratio VOUT/2.42.
Note 9: Slope compensation is the current subtracted from the switch
current limit at 80% duty cycle. See Maximum Output Load Current in the
Applications Information section for further details.
TYPICAL PERFOR A CE CHARACTERISTICS
Switch Voltage Drop
500
450
125°C
400
350
25°C
300
250
– 40°C
200
150
100
50
0
0
1
2
3
4
5
SWITCH CURRENT (A)
1374 G18
Shutdown Pin Bias Current
500
CURRENT REQUIRED TO FORCE SHUTDOWN
400 (FLOWS OUT OF PIN). AFTER SHUTDOWN,
CURRENT DROPS TO A FEW µA
300
200
8
AT 2.38V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
4
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1374 G04
Switch Peak Current Limit
6.5
6.0
TYPICAL
5.5
5.0
MINIMUM
4.5
4.0
3.5
3.0
0
20
40
60
80 100
DUTY CYCLE (%)
1374 G02
Standby and Shutdown Thresholds
2.40
STANDBY
2.36
2.32
0.8
START-UP
0.4
SHUTDOWN
0
–50 –25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
1374 G05
Feedback Pin Voltage
2.430
2.425
2.420
2.415
2.410
– 50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1374 G03
Shutdown Supply Current
25
VSHDN = 0V
20
15
10
5
0
0
5
10
15
20
25
INPUT VOLTAGE (V)
1374 G06
1374fd
4
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