LTC3788-1 Datasheet, PDF (8/28 Pages) Linear Technology – 2-Phase, Dual Output Synchronous Boost Controller

LTC3788-1
TYPICAL PERFORMANCE CHARACTERISTICS
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
Maximum Current Sense
Threshold vs I_TH 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
I_TH VOLTAGE (V)
37881 G21
SENSE Pin Input Current
vs Temperature
260
240 ^{VSENSE = 12V}
220
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
37881 G22
SENSE Pin Input Current
vs I_TH Voltage
260
240 ^{VSENSE = 12V}
220
200
SENSE⁺ PIN
180
160
140
120
100
80
60
40
20
0
0 0.5
SENSE ^– PIN
1 1.5 2
I_TH VOLTAGE (V)
2.5 3
37881 G23
SENSE Pin Input Current
vs V_SENSE Voltage
260
240
220
SENSE⁺ PIN
200
180
160
140
120
100
80
60
40
20
SENSE ^– PIN
0
2.5 7.5 12.5 17.5 22.5 27.5 32.5 37.5
VSENSE COMMON MODE VOLTAGE (V)
37881 G24
8
Maximum Current Sense
Threshold vs Duty Cycle
120
100
80
60
40
20
0
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
37881 G25
Charge Pump Charging Current
vs Operating Frequency
80
V_SW = 12V
70 ^VBOOST ^{– V}SW ^{= 4.5V}
T = –45°C
60
T = 25°C
50
40
T = 130°C
30
20
10
0
50 150 250 350 450 550 650 750
OPERATING FREQUENCY (kHz)
37881 G26
37881f