LTC3786_15 Datasheet, PDF (7/34 Pages) Linear Technology – Low IQ Synchronous Boost Controller

Typical Performance Characteristics
LTC3786
INTV_CC vs Load Current
5.50
V_IN = 12V
5.45
5.40
5.35
5.30
5.25
5.20
5.15
0
20 40 60 80 100 120 140 160 180
LOAD CURRENT (mA)
3786 G18
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
3786 G21
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
3786 G24
INTV_CC vs Load Current
5.2
V_IN = 5V
5.0
4.8
4.6
4.4
4.2
4.0
0
10 20 30 40 50 60
LOAD CURRENT (mA)
3786 G19
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)
3786 G22
SENSE Pin Input Current
vs V_SENSE Voltage
260
240
220
200
SENSE⁺ PIN
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
V_SENSE COMMON MODE VOLTAGE (V) _{3786 G25}
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
3786 G20
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
3786 G23
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 (%)
3786 G26
3786fa
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