LTC3826_15 Datasheet, PDF (6/36 Pages) Linear Technology – 30A IQ, Dual, 2-Phase Synchronous Step-Down Controller

LTC3826
TYPICAL PERFORMANCE CHARACTERISTICS
Total Input Supply Current
vs Input Voltage
350
300
250
200
150
300μA LOAD
100
50
NO LOAD
0
5 10 15 20 25 30 35
INPUT VOLTAGE (V)
3826 G10
Maximum Current Sense Voltage
vs I_TH Voltage
100
PULSE SKIPPING
FORCED CONTINUOUS
80
Burst Mode OPERATION
(RISING)
60
Burst Mode OPERATION
(FALLING)
40
20
0
–20
10% DUTY CYCLE
–40
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
I_TH PIN VOLTAGE (V)
3826 G13
EXTV_CC Switchover and INTV_CC
Voltages vs Temperature
6.0
5.8
5.6
5.4
INTV_CC
5.2
5.0
4.8
EXTV_CC RISING
4.6
4.4
EXTV_CC FALLING
4.2
4.0
–45 –25 –5 15 35 55 75 95
TEMPERATURE (°C)
3826 G11
Sense Pins Total Input
Bias Current
60
30
0
–30
–60
–90
–120
–150
–180
–210
–240
–270
–300
0
1 2 3 4 5 6 7 8 9 10
V_SENSE COMMON MODE VOLTAGE (V)
3826 G14
Foldback Current Limit
120
TRACK/SS = 1V
100
80
60
40
20
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
FEEDBACK VOLTAGE (V)
3826 G16
Quiescent Current vs Temperature
44
PLLIN/MODE = 0V
42
40
38
36
34
32
30
28
26
24
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (°C)
3826 G17
6
INTV_CC Line Regulation
5.5
5.4
5.3
5.2
5.1
5.0
0 5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
3826 G12
Maximum Current Sense
Threshold vs Duty Cycle
120
100
80
60
40
20
0
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
3826 G15
SENSE Pins Total Input
Bias Current vs I_TH
4
V_SENSE = 3.3V
3
2
1
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
I_TH VOLTAGE (V)
3826 G18
3826fc