LTC3875_15 Datasheet, PDF (6/44 Pages) Linear Technology – Dual, 2-Phase, Synchronous Controller with Low Value DCR Sensing and Temperature Compensation

LTC3875
Typical Performance Characteristics
INTV_CC Line Regulation
6
5
4
3
2
1
0
0 5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
3875 G10
Maximum Current Sense
Threshold vs Feedback Voltage
(Current Foldback)
35
30
ILIM = INTV_CC
25
ILIM = 3/4 INTV_CC
20
ILIM = 1/2 INTV_CC
15
ILIM = 1/4 INTV_CC
ILIM = GND
10
5
0
0 0.1 0.2 0.3 0.4 0.5 0.6
FEEDBACK VOLTAGE (V)
3875 G13
Current Sense Threshold
vs I_TH Voltage
40
ILIM = 0
35
ILIM = 1/4 INTV_CC
30
ILIM = 1/2 INTV_CC
ILIM = 3/4 INTV_CC
25
ILIM = INTV_CC
20
15
10
5
0
–5
–10
0
0.5
1
1.5
I_TH VOLTAGE (V)
2
3875 G11
TK/SS Pull-Up Current
vs Temperature
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
3875 G14
Maximum Current Sense Threshold
vs Common Mode Voltage
35
ILIM = INTV_CC
30
ILIM = 3/4 INTV_CC
25
20
ILIM = 1/2 INTV_CC
ILIM = 1/4 INTV_CC
15
ILIM = GND
10
5
0
0
1
2
3
4
V_SENSE COMMON MODE VOLTAGE (V)
3875 G12
Shutdown (RUN) Threshold
vs Temperature
1.30
1.25
ON
1.20
1.15
OFF
1.10
1.05
1.00
–50
0
50
100
TEMPERATURE (°C)
150
4320 G01
Regulated Feedback Voltage
vs Temperature
0.6045
0.6035
0.6025
0.6015
0.6005
0.5995
0.5985
0.5975
0.5965
0.5955
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
3875 G16
Oscillator Frequency
vs Temperature
900
800
V_FREQ = INTV_CC
700
600
V_FREQ = 1.22V
500
400
300
V_FREQ = GND
200
100
0
–50
0
50
100
TEMPERATURE (°C)
150
3875 G17
3875fa
6
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