Datasheet

LTC3786
7
3786fc
For more information www.linear.com/LTC3786
TYPICAL PERFORMANCE CHARACTERISTICS
Oscillator Frequency
vs Input Voltage
Maximum Current Sense
Threshold vs I
TH
Voltage
SENSE Pin Input Current
vs Temperature
SENSE Pin Input Current
vs I
TH
Voltage
SENSE Pin Input Current
vs V
SENSE
Voltage
Maximum Current Sense
Threshold vs Duty Cycle
INTV
CC
vs Load Current INTV
CC
vs Load Current
Oscillator Frequency
vs Temperature
FREQ = GND
FREQ = INTV
CC
TEMPERATURE (°C)
–45
–25
–5
15
35
55
75
95
115
135
155
300
350
400
450
500
550
600
FREQUENCY (kHz)
3786 G20
15
5 10 20
25 30 35 40
INPUT VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
344
354
356
358
360
350
342
352
340
348
346
3786 G21
FREQ = GND
SENSE
PIN
SENSE
+
PIN
V
SENSE
= 12V
TEMPERATURE (°C)
–45
–25
–5
15
35
55
75
95
115
135
155
0
20
40
60
80
100
120
140
160
180
200
220
240
260
SENSE CURRENT (µA)
3786 G23
I
TH
VOLTAGE (V)
0
MAXIMUM CURRENT SENSE VOLTAGE (mV)
80
120
100
0.6 1.0
3786 G22
40
0
0.2 0.4
0.8 1.2 1.4
–40
60
20
–20
–60
PULSE-SKIPPING MODE
FORCED CONTINUOUS MODE
Burst Mode OPERATION
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
3786 G24
SENSE
+
PIN
SENSE
PIN
V
SENSE
= 12V
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
3786 G25
SENSE
+
PIN
SENSE
PIN
DUTY CYCLE (%)
0
80
100
70
60
40
20 40
10 90
30 50
80
60 100
20
0
3786 G26
LOAD CURRENT (mA)
0
5.15
INTV
CC
VOLTAGE (V)
5.20
5.30
5.35
12040
5.50
3786 G18
5.25
20
60
100 160140
80 180
5.40
5.45
V
IN
= 12V
LOAD CURRENT (mA)
0
4.0
INTV
CC
VOLTAGE (V)
4.2
4.4
4.6
4.8
5.2
10
20 30 40
3786 G19
50 60
5.0
V
IN
= 5V
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