Datasheet

LTC3858
7
3858fc
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 Input Current
vs Input Voltage
Oscillator Frequency
vs Temperature
Undervoltage Lockout Threshold
vs Temperature
TEMPERATURE (°C)
–45
SS PULL-UP CURRENT (µA)
1.15
30
3858 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
3858 G20
1.00
1.30
1.35
1.20
–20
30
105
130
TEMPERATURE (°C)
–45
REGULATED FEEDBACK VOLTAGE (mV)
806
30
22554 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
3858 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 30
3858 G23
6
4
10 15
25 35 40
2
0
12
INPUT CURRENT (µA)
TEMPERATURE (°C)
–45
3.4
INTV
CC
VOLTAGE (V)
3.5
3.7
3.8
3.9
4.4
4.1
5
55
80
3858 G25
3.6
4.2
4.3
4.0
–20
30
105
130
Oscillator Frequency
vs Input Voltage
INPUT VOLTAGE (V)
5
OSCILLATOR FREQUENCY (kHz)
352
354
356
20 30
3858 G28
350
348
10 15
25 35 40
346
344
FREQ = GND
TEMPERATURE (°C)
–45
FREQUENCY (kHz)
700
30
3858 G24
400
200
–20 5 55
100
0
800
600
500
300
80 105 130
FREQ = INTV
CC
FREQ = GND