LTC3788-1(RevA) 查看數據表（PDF） - Linear Technology
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LTC3788-1 Datasheet PDF : 30 Pages
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC3788-1
Quiescent Current vs Temperature
170
VIN = 12V
160
VFB = 1.25V
RUN2 = GND
150
140
130
120
110
100
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
37881 G13
INTVCC Line Regulation
5.5
5.4
5.3
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
35 40
37881 G16
Oscillator Frequency
vs Temperature
600
FREQ = INTVCC
550
500
450
400
FREQ = GND
350
300
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
37881 G19
Shutdown (RUN) Threshold
vs Temperature
1.40
1.35
1.30
RUN RISING
1.25
1.20
RUN FALLING
1.15
1.10
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
37881 G14
EXTVCC Switchover and INTVCC
Voltages vs Temperature
6.0
5.8
5.6
INTVCC
5.4
5.2
5.0
4.8
EXTVCC RISING
4.6
EXTVCC FALLING
4.4
4.2
4.0
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
37881 G17
Oscillator Frequency
vs Input Voltage
360
FREQ = GND
358
356
354
352
350
348
346
344
342
340
5
10 15 20 25 30
INPUT VOLTAGE (V)
35 40
37881 G20
Undervoltage Lockout Threshold
vs Temperature
4.4
4.3
4.2
INTVCC RISING
4.1
4.0
3.9
3.8
INTVCC FALLING
3.7
3.6
3.5
3.4
–45 –20
5 30 55 80 105 130
TEMPERATURE (°C)
37881 G15
INTVCC vs INTVCC Load Current
5.50
VIN = 12V
5.45
5.40
EXTVCC = 0V
5.35
5.30
5.25
5.20
EXTVCC = 6V
5.15
5.10
5.05
5.00
0
20 40 60 80 100 120 140 160 180 200
INTVCC LOAD CURRENT (mA)
37881 G18
Maximum Current Sense
Threshold vs ITH Voltage
120
PULSE-SKIPPING MODE
100
FORCED CONTINUOUS MODE
Burst Mode OPERATION
80
60
40
20
0
–20
–40
–60
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4
ITH VOLTAGE (V)
37881 G21
37881fa
7
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