LTC3827 Datasheet, PDF (6/36 Pages) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

LTC3827
TYPICAL PERFORMANCE CHARACTERISTICS
Total Input Supply Current
vs Input Voltage
350
300
250
300μA LOAD
200
150
100
NO LOAD
50
0
5 10
15 20
25 30 35
INPUT VOLTAGE (V)
3827 G10
Maximum Current Sense Voltage
vs I_TH Voltage
100
PULSE SKIPPING
80
FORCED CONTINUOUS
BURST MODE (RISING)
BURST MODE (FALLING)
60
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)
3827 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)
3827 G11
Sense Pins Total Input
Bias Current
200
100
0
–100
–200
–300
–400
–500
–600
–700
0
1 2 3 4 5 6 7 8 9 10
V_SENSE COMMON MODE VOLTAGE (V)
3827 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)
3827 G16
Quiescent Current vs Temperature
100
PLLIN/MODE = 0V
95
90
85
80
75
70
65
60
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (°C)
3827 G17
6
INTV_CC Line Regulation
5.50
5.45
5.40
5.35
5.30
5.25
5.20
5.15
5.10
5.05
5.00
0 5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
3827 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 (%)
3827 G15
SENSE Pins Total Input
Bias Current vs I_TH
12
V_SENSE = 3.3V
10
8
6
4
2
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
I_TH VOLTAGE (V)
3827 G18
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