Datasheet

LTC3851
7
3851fb
Regulated Feedback Voltage
vs Temperature
Oscillator Frequency
vs Temperature
Undervoltage Lockout Threshold
(INTV
CC
) vs Temperature
Oscillator Frequency
vs Input Voltage
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown Input DC Supply
Current vs Input Voltage
Shutdown (RUN) Threshold
vs Temperature
Shutdown Input DC Supply
Current vs Temperature
Input DC Supply Current
vs Temperature
TEMPERATURE (°C)
–50 –25
0.9
RUN PIN VOLTAGE (V)
1.1
1.4
0
50
75
3851 G20
1.0
1.3
1.2
25
100
125
RUN RISING THRESHOLD (ON)
RUN FALLING THRESHOLD (OFF)
TEMPERATURE (°C)
–50
REGULATED FEEDBACK VOLTAGE (mV)
802
804
806
25 75
3851 G21
800
798
–25 0
50 100 125
796
794
TEMPERATURE (°C)
–50
600
700
900
25 75
3851 G22
500
400
–25 0
50 100 125
300
200
800
FREQUENCY (kHz)
R
FREQ
= 36k
R
FREQ
= 60k
R
FREQ
= 150k
INPUT VOLTAGE (V)
5
FREQUENCY (kHz)
415
20
3851 G23
400
390
10 15 25
385
380
420
410
405
395
30 35 40
R
FREQ
= 80k
TEMPERATURE (°C)
–50 –25
0
INTV
CC
VOLTAGE AT UVLO THRESHOLD (V)
2
5
0
50
75
3851 G24
1
4
3
25
100
125
INTV
CC
RAMPING UP
INTV
CC
RAMPING DOWN
INPUT VOLTAGE (V)
0
SHUTDOWN SUPPLY CURRENT (µA)
20
30
40
3851 G25
10
0
10
20
30
5
15
25
35
40
15
25
5
35
TEMPERATURE (°C)
–50
SHUTDOWN INPUT DC SUPPLY CURRENT (µA)
35
25
3851 G26
20
10
–25 0 50
5
0
40
30
25
15
75 100 125
TEMPERATURE (°C)
–50
INPUT DC SUPPLY CURRENT (mA)
2.0
2.5
3.0
25 75
3851 G27
1.5
1.0
–25 0
50 100 125
0.5
0
Maximum Current Sense
Threshold vs INTV
CC
Voltage
INTV
CC
VOLTAGE(V)
3.2 3.4 3.6
0
MAXIMUM V
SENSE
(mV)
10
30
40
50
4.4 4.6 4.8
90
38511 G28
20
3.8 4.0 4.2 5.0
60
70
80
I
SET
= INTV
CC
I
SET
= FLOAT
I
SET
= GND