LTC3851 LINER [Linear Technology], LTC3851 Datasheet - Page 6

• Manufacturer Part Number: LTC3851
• Description: Synchronous Step-Down Switching Regulator Controller
• Manufacturer: LINER [Linear Technology]

LTC3851
TYPICAL PERFORMANCE CHARACTERISTICS
6
5.3
5.1
4.9
4.7
4.5
4.3
4.1
3.9
3.7
3.5
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
60
50
40
30
20
10
0
0.4
–50
4
INTV
Burst Mode Peak Current Sense
Threshold vs I
TK/SS Pull-Up Current vs
Temperature
I
BURST COMPARATOR FALLING THESHOLD:
V
LIM
ITH
0.6
8
–25
= FLOAT
= 0.4V
CC
0.8
12
Line Regulation
1.0
0
INPUT VOLTAGE (V)
TEMPERATURE (°C)
16
1.2
I
25
TH
20
V
I
LOAD
LOAD
ITH
1.4
Voltage
(V)
24
= 25mA
50
= 0mA
1.6
MAXIMUIM
28
MINIMUIM
1.8
75
32
2.0
100
36
2.2
3851 G13
3851 G16
3851 G19
125
2.4
40
60
50
40
20
1.2
0.9
90
80
70
60
50
40
30
20
10
90
80
70
30
10
1.4
1.3
1.1
1.0
0
0
–50 –25
0
0
Maximum Current Sense Threshold
vs Common Mode Voltage
Maximum Current Sense
Threshold vs Duty Cycle
Shutdown (RUN) Threshold vs
Temperature
0.5 1 1.5 2 2.5
V
SENSE
RUN FALLING THRESHOLD (OFF)
20
RUN RISING THRESHOLD (ON)
COMMON MODE VOLTAGE (V)
0
TEMPERATURE (°C)
DUTY CYCLE (%)
I
I
I
I
LIM
LIM
40
LIM
LIM
I
I
LIM
LIM
25
= INTV
= INTV
= FLOAT
= FLOAT
= GND
= GND
50
60
3 3.5 4 4.5
CC
CC
75
80
100
3851 G14
3851 G17
3851 G20
125
100
5
806
804
794
–10
–20
802
800
798
796
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
0
0
–50
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
0
Maximum Peak Current Sense
Threshold vs I
Regulated Feedback Voltage vs
Temperature
Maximum Current Sense
Threshold vs Feedback Voltage
(Current Foldback)
DUTY CYCLE RANGE: 0% TO 100%
–25
0.1
0.2
FEEDBACK VOLTAGE (V)
0
TEMPERATURE (°C)
0.3
25
TH
V
ITH
0.4
Voltage
(V)
50
I
I
LIM
LIM
I
LIM
0.5
I
LIM
= INTV
I
= FLOAT
LIM
I
= GND
75
LIM
0.6
= INTV
= FLOAT
= GND
CC
100
0.7
CC
3851 G15
3851 G21
3851 G18
3851f
125
2.4
0.8