Datasheet

LTC3868-1
7
38681fd
TYPICAL PERFORMANCE CHARACTERISTICS
Soft-Start Pull-Up Current
vs Temperature
Shutdown (RUN) Threshold
vs Temperature
Regulated Feedback Voltage
vs Temperature
SENSE
–
Pin Input Current
vs Temperature
Shutdown Current
vs Input Voltage
Oscillator Frequency
vs Temperature
Undervoltage Lockout Threshold
vs Temperature
TEMPERATURE (°C)
–45
SS PULL-UP CURRENT (µA)
1.15
30
38681 G19
1.00
0.90
–20 5 55
0.85
0.80
1.20
1.10
1.05
0.95
80 105 130
TEMPERATURE (°C)
–45
0.90
RUN PIN VOLTAGE (V)
0.95
1.05
1.10
1.15
1.40
1.25
5
55
80
38681 G20
1.00
1.30
1.35
1.20
–20
30
105
130
TEMPERATURE (°C)
–45
REGULATED FEEDBACK VOLTAGE (mV)
806
30
38681 G21
800
796
–20 5 55
794
792
808
804
802
798
80 105 130
TEMPERATURE (°C)
–45
–600
SENSE
–
CURRENT (µA)
–550
–200
–150
50
–50
–20
30
55 130
38681 G22
0
–100
–400
–350
–500
–450
–250
–300
5
80
105
V
OUT
= 3.3V
V
OUT
= 28V
INPUT VOLTAGE (V)
5
8
10
14
20
38681 G23
6
4
10 15
25 28
2
0
12
INPUT CURRENT (µA)
Oscillator Frequency
vs Input Voltage
INPUT VOLTAGE (V)
5
OSCILLATOR FREQUENCY (kHz)
352
354
356
20
38681 G28
350
348
10 15
25 28
346
344
TEMPERATURE (°C)
–45
3.4
INTV
CC
VOLTAGE (V)
3.5
3.7
3.8
3.9
4.4
4.1
5
55
80
38681 G25
3.6
4.2
4.3
4.0
–20
30
105
130
TEMPERATURE (°C)
–45
FREQUENCY (kHz)
700
30
38681 G24
400
200
–20 5 55
100
0
800
600
500
300
80 105 130
FREQ = INTV
CC
FREQ = GND