Datasheet

LTC3857-1
7
38571fc
TYPICAL PERFORMANCE CHARACTERISTICS
TRACK/SS 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
Oscillator Frequency
vs Input Voltage
Shutdown Current vs Temperature
TEMPERATURE (°C)
–45
0.90
TRACK/SS CURRENT (µA)
0.95
1.00
1.05
1.10
–20 5 30 55
38571 G19
80 105 130
TEMPERATURE (°C)
–45
RUN PIN VOLTAGE (V)
1.30
1.35
1.40
30 80
38571 G20
1.25
1.20
–20 5
55 105 130
1.15
1.10
RUN RISING
RUN FALLING
TEMPERATURE (°C)
–45
REGULATED FEEDBACK VOLTAGE (mV)
806
30
3857 G21
800
796
–20 5 55
794
792
800
804
802
798
80 105 130
TEMPERATURE (°C)
–45
–600
SENSE
–
CURRENT (µA)
–500
–550
–400
–450
–300
–350
50
–50
–20
30
55 130
38571 G22
0
–150
–100
–200
–250
5
80
105
V
OUT
< INTV
CC
– 0.5V
V
OUT
> INTV
CC
– 0.5V
INPUT VOLTAGE (V)
5
INPUT CURRENT (µA)
20
25
30
20 30
38571 G23
15
10
10 15
25 35 40
5
0
TEMPERATURE (°C)
–45
FREQUENCY (kHz)
500
550
600
30 80
38571 G24
450
400
–20 5
55 105 130
350
300
FREQ = GND
FREQ = INTV
CC
INPUT VOLTAGE (V)
5
OSCILATOR FREQUENCY (kHz)
352
354
356
20 30
38571 G26
350
348
10 15
25 35 40
346
344
FREQ = GND
TEMPERATURE (°C)
–45
SHUTDOWN CURRENT (µA)
18
30
38571 G27
12
8
–20 5 55
6
4
20
16
14
10
80 105 130
TEMPERATURE (°C)
–45
3.4
INTV
CC
VOLTAGE (V)
3.5
3.7
3.8
3.9
4.4
4.1
5
55
80
38571 G25
3.6
4.2
4.3
4.0
–20
30
105
130