Datasheet

LTC3787
8
3787fc
SENSE Pin Input Current
vs Temperature
Oscillator Frequency
vs Temperature
Maximum Current Sense
Threshold vs I
TH
Voltage
SENSE Pin Input Current
vs V
SENSE
Voltage
SENSE Pin Input Current
vs I
TH
Voltage
Oscillator Frequency
vs Input Voltage
TYPICAL PERFORMANCE CHARACTERISTICS
15
510 2025 30 35 40
INPUT VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
344
354
356
358
360
350
342
352
340
348
346
3
7
8
7
G
2
0
FREQ = GND
I
TH
VOLTAGE (V)
0
MAXIMUM CURRENT SENSE VOLTAGE (mV)
80
120
100
0.6 1.0
3787 G21
40
0
0.2 0.4
0.8 1.2 1.4
–40
60
20
–20
–60
I
LIM
= GND
I
LIM
= FLOAT
I
LIM
= INTV
CC
Burst Mode
OPERATION
PULSE-SKIPPING MODE
FORCED CONTINUOUS MODE
I
TH
VOLTAGE (V)
0
SENSE CURRENT (µA)
1
2
2.5
0
80
40
160
200
240
120
20
100
60
180
220
260
140
0.5
1.5
3
3787 G23
SENSE
+
PIN
SENSE
–
PIN
V
SENSE
= 12V
I
LIM
= INTV
CC
I
LIM
= FLOAT
I
LIM
= GND
I
LIM
= INTV
CC
I
LIM
= FLOAT
I
LIM
= GND
V
SENSE
COMMON MODE VOLTAGE (V)
2.5
SENSE CURRENT (µA)
17.5
27.5
32.5
0
80
40
160
200
240
120
20
100
60
180
220
260
140
7.5 12.5
22.5
37.5
3787 G24
SENSE
+
PIN
SENSE
–
PIN
I
LIM
= INTV
CC
I
LIM
= FLOAT
I
LIM
= GND
I
LIM
= INTV
CC
I
LIM
= FLOAT
I
LIM
= GND
TEMPERATURE (°C)
300
FREQUENCY (kHz)
350
600
450
500
550
400
3787 G19
–60 15
–35 –10 40 65 90 140115
FREQ = INTV
CC
FREQ = GND
TEMPERATURE (°C)
SENSE CURRENT (µA)
0
80
40
160
200
240
120
20
100
60
180
220
260
140
3787 G22
–60 15
–35 –10 40 65 90 140115
SENSE
–
PIN
SENSE
+
PIN
V
SENSE
= 12V
I
LIM
= FLOAT