LTC3769_15 Datasheet, PDF (7/32 Pages) Linear Technology – 60V Low IQ Synchronous Boost Controller

LTC3769
Typical Performance Characteristics T_A = 25°C unless otherwise noted.
INTV_CC vs INTV_CC Load Current
5.50
V_IN = 12V
5.45
5.40
EXTV_CC = 0V
5.35
5.30
5.25
5.20
EXTV_CC = 6V
5.15
5.10
5.05
5.00
0
20 40 60 80 100 120 140 160 180 200
INTV_CC LOAD CURRENT (mA)
3769 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 35 40 45 50 55 60 65
INPUT VOLTAGE (V)
3769 G20
EXTV_CC Switchover and INTV_CC
Voltages vs Temperature
6.0
5.8
5.6
INTV_CC
5.4
5.2
5.0
4.8
EXTV_CC RISING
4.6
4.4
EXTV_CC FALLING
4.2
4.0
–60 –35 –10 15 40 65 90
TEMPERATURE (°C)
115 140
3769 G18
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)
3769 G21
Oscillator Frequency
vs Temperature
600
FREQ = INTV_CC
550
500
450
400
FREQ = GND
350
300
–60 –35 –10 15 40 65 90
TEMPERATURE (°C)
115 140
3769 G19
SENSE Pin Input Current
vs Temperature
260
240
220
V_SENSE = 12V
I_LIM = FLOAT
200
SENSE⁺ PIN
180
160
140
120
100
80
60
40
20
SENSE ^– PIN
0
–60 –35 –10 15 40 65 90 115 140
TEMPERATURE (°C)
3769 G22
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
I_LIM = INTV_CC
I_LIM = FLOAT
I_LIM = GND
0 0.5 1 1.5 2 2.5 3
I_TH VOLTAGE (V)
3769 G23
SENSE Pin Input Current
vs V_SENSE Voltage
260
240 SENSE⁺ PIN
I_LIM = INTV_CC
220
I_LIM = FLOAT
200
180
I_LIM = GND
160
140
120
100
80
60
I_LIM = INTV_CC
40
I_LIM = FLOAT
20 _SENSE– _PIN
I_LIM = GND
0
5 10 15 20 25 30 35 40 45 50 55 60 65
VSENSE COMMON MODE VOLTAGE (V)
3769 G24
3769f
For more information www.linear.com/LTC3769
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