Datasheet

LTC3827-1
6
38271fe
TYPICAL PERFORMANCE CHARACTERISTICS
TRACK/SS Pull-Up Current
vs Temperature
Shutdown (RUN) Threshold
vs Temperature
Regulated Feedback Voltage
vs Temperature
TEMPERATURE (°C)
–45
TRACK/SS CURRENT (µA)
1.00
1.05
1.10
75
38271 G19
0.95
0.90
0.80
–15
15
45
–30 90
0
30
60
0.85
1.20
1.15
TEMPERATURE (°C)
–45
RUN PIN VOLTAGE (V)
0.80
0.85
0.90
75
38271 G20
0.75
0.65
0.50
–15
15
45
–30 90
0
30
60
0.55
0.70
0.60
1.00
0.95
TEMPERATURE (°C)
–45
REGULATED FEEDBACK VOLTAGE (mV)
800
802
804
75
38271 G21
798
796
792
–15
15
45
–30 90
0
30
60
794
808
806
Foldback Current Limit Quiescent Current vs Temperature
SENSE Pins Total Input
Bias Current vs I
TH
FEEDBACK VOLTAGE (V)
0
0
20
60
80
100
0.2
0.4
0.5 0.9
38271 G16
40
0.1 0.3
0.6
0.7
0.8
120
MAXIMUM CURRENT SENSE VOLTAGE (V)
TRACK/SS = 1V
TEMPERATURE (°C)
–45
QUIESCENT CURRENT (µA)
80
85
90
75
38271 G17
75
70
60
–15
15
45
–30 90
0
30
60
65
100
95
PLLIN/MODE = 0V
I
TH
VOLTAGE (V)
0
INPUT CURRENT (µA)
2
4
6
8
12
38271 G18
0
0.2
0.4 0.6 0.8 1 1.2 1.4
10
V
SENSE
= 3.3V
Maximum Current Sense Voltage
vs I
TH
Voltage
Sense Pins Total Input
Bias Current
Maximum Current Sense
Threshold vs Duty Cycle
I
TH
PIN VOLTAGE (V)
0
40
60
100
0.6 1.0
38271 G13
20
0
0.2 0.4
0.8 1.2 1.4
–20
–40
80
CURRENT SENSE THRESHOLD (mV)
PULSE SKIPPING
FORCED CONTINUOUS
BURST MODE (RISING)
BURST MODE (FALLING)
10% Duty Cycle
V
SENSE
COMMON MODE VOLTAGE (V)
0
–700
INPUT CURRENT (µA)
–600
–400
–300
–200
6789
200
38271 G14
–500
12345 10
–100
0
100
DUTY CYCLE (%)
0
CURRENT SENSE THRESHOLD (mV)
40
80
120
20
60
100
20 40 60 80
38271 G15
10010030507090