LTC3865-1_15 Datasheet, PDF (7/38 Pages) Linear Technology – Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs

LTC3865/LTC3865-1
TYPICAL PERFORMANCE CHARACTERISTICS
Tracking Up and Down with
External Ramp
(Forced Continuous Mode)
Quiescent Current vs Input
Voltage without EXTV_CC
5
INTV_CC Line Regulation
5.25
TK/SS1
TK/SS2
2V/DIV
V_OUT1 = 1.5V
1Ω LOAD
500mV/DIV
V_OUT2 = 1.2V
1Ω LOAD
500mV/DIV
20ms/DIV
3865 G07
Current Sense Threshold
vs I_TH Voltage
80
I_LIM = INTV_CC
60
I_LIM = FLOAT
40
20
I_LIM = GND
0
–20
–40
0
0.5
1
1.5
2
V_ITH (V)
3865 G10
4
3
2
1
0
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
3865 G08
Maximum Current Sense
Threshold vs Common Mode
Voltage
80
70
I_LIM = INTV_CC
60
50
I_LIM = FLOAT
40
I_LIM = GND
30
20
10
0
0
1
2
3
4
5
V_SENSE COMMON MODE VOLTAGE (V)
3865 G11
5.00
4.75
4.50
4.25
4.00
3.75
3.50
3.25
3.00
0
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
3865 G09
Maximum Current Sense
Threshold vs Duty Cycle
100
90
80
I_LIM = INTV_CC
70
60
I_LIM = FLOAT
50
40
I_LIM = GND
30
20
10
0
0
20
40
60
80 100
DUTY CYCLE (%)
3865 G12
Maximum Current Sense
Voltage vs Feedback Voltage
(Current Foldback)
100
90
80
I_LIM = INTV_CC
70
60
I_LIM = FLOAT
50
40
I_LIM = GND
30
20
10
0
0 0.1 0.2 0.3 0.4 0.5 0.6
FEEDBACK VOLTAGE (V)
3865 G13
TK/SS Pull-Up Current
vs Temperature
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3865 G14
3865fb
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