LTC3807_15 Datasheet, PDF (7/32 Pages) Linear Technology – Low IQ, Synchronous Step-Down Controller with 24V Output Voltage Capability

TYPICAL PERFORMANCE CHARACTERISTICS
Maximum Current Sense Voltage
vs I_TH Voltage
80
5% DUTY CYCLE
60
PULSE-SKIPPING MODE
40
Burst Mode
OPERATION
20
I_LIM = GND
0
I_LIM = INTV_CC
–20
I_LIM = FLOAT
FORCED CONTINUOUS MODE
–40
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
V_ITH (V)
3807 G13
SENSE^– Pin Input Bias Current
800
700
600
500
400
300
200
100
0
–100
0
5
10 15 20 25
V_SENSE COMMON MODE VOLTAGE (V)
3807 G14
Foldback Current Limit
80
I_LIM = FLOAT
70
60
I_LIM = INTV_CC
50
40
30
I_LIM = GND
20
10
0
0 100 200 300 400 500 600 700 800
FEEDBACK VOLTAGE (MV)
3807 G16
TRACK/SS Pull-Up Current
vs Temperature
12.0
11.5
11.0
10.5
10.0
9.5
9.0
8.5
8.0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3807 G19
Quiescent Current vs Temperature
80
V_IN = 12V
75 Burst Mode OPERATION
70
65
60
55
50
45
40
35
30
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3807 G17
Shutdown (RUN) Threshold
vs Temperature
1.30
1.25
1.20
RUN FALLING
1.15
RUN RISING
1.10
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3807 G20
For more information www.linear.com/LTC3807
LTC3807
Maximum Current Sense
Threshold vs Duty Cycle
80
70
I_LIM = FLOAT
60
50
I_LIM = INTV_CC
40
I_LIM = GND
30
20
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
3807 G15
INTV_CC vs INTV_CC Load Current
5.50
V_IN = 12V
5.25
EXTV_CC = 0V
5.00
EXTV_CC = 8.5V
4.75
4.50
EXTV_CC = 5V
4.25
4.00
0
20
40
60
80
INTV_CC LOAD CURRENT (mA)
100
3807 G18
Regulated Feedback Voltage
vs Temperature
808
806
804
802
800
798
796
794
792
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3807 G21
3807f
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