LTC3788 Datasheet, PDF (8/32 Pages) Linear Technology – 2-Phase, Dual Output Synchronous Boost Controller

LTC3788
TYPICAL PERFORMANCE CHARACTERISTICS
8
Oscillator Frequency
vs Temperature
600
FREQ = INTV_CC
550
500
450
400
FREQ = GND
350
300
–45 –20
5 30 55 80
TEMPERATURE (°C)
105 130
3788 G19
Maximum Current Sense
Threshold vs I_TH Voltage
120
100
80
PULSE SKIPPING MODE
60
Burst Mode
OPERATION
40
20
0
I_LIM = GND
I_LIM = FLOAT
–20
I_LIM = INTV_CC
–40 ^{FORCED CONTINUOUS MODE}
–60
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4
I_TH VOLTAGE (V)
3788 G21
SENSE Pin Input Current
vs I_TH Voltage
260
240 ^{VSENSE = 12V}
I_LIM = INTV_CC
220
200 _SENSE+ _PIN
180
I_LIM = FLOAT
I_LIM = GND
160
140
120
100
80
60
40
20 _{SENSE – PIN}
0
0 0.5 1
I_LIM = INTV_CC
I_LIM = FLOAT
I_LIM = GND
1.5 2 2.5 3
I_TH VOLTAGE (V)
3788 G23
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
3788 G20
SENSE Pin Input Current
vs Temperature
260
240
220
V_SENSE = 12V
I_LIM = FLOAT
SENSE⁺ PIN
200
180
160
140
120
100
80
60
40
20
0
–45 –20
SENSE ^– PIN
5 30 55 80
TEMPERATURE (°C)
105 130
3788 G22
SENSE Pin Input Current
vs V_SENSE Voltage
260
240 SENSE⁺ PIN
I_LIM = INTV_CC
220
200
I_LIM = FLOAT
180
I_LIM = GND
160
140
120
100
80
60
40
20 _{SENSE – PIN}
0
I_LIM = INTV_CC
I_LIM = FLOAT
I_LIM = GND
2.5 7.5 12.5 17.5 22.5 27.5 32.5 37.5
VSENSE COMMON MODE VOLTAGE (V)
3788 G24
3788f