ltc3851-1 Linear Technology Corporation, ltc3851-1 Datasheet - Page 6

• Manufacturer Part Number: ltc3851-1
• Description: Synchronous Step-down Switching Regulator Controller
• Manufacturer: Linear Technology Corporation

LTC3851-1
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
–50
0.4
4
INTV
Burst Mode Peak Current Sense
Threshold vs I
TK/SS Pull-Up Current vs
Temperature
BURST COMPARATOR FALLING THESHOLD:
V
ITH
0.6
8
–25
= 0.4V
CC
0.8
12
Line Regulation
1.0
0
INPUT VOLTAGE (V)
TEMPERATURE (°C)
16
1.2
25
I
TH
V
I
20
LOAD
LOAD
ITH
1.4
Voltage
(V)
24
50
= 25mA
= 0mA
1.6
MAXIMUIM
28
MINIMUIM
1.8
75
32
2.0
100
38511 G13
36
2.2
38511 G16
38511 G19
125
2.4
40
1.2
0.9
90
70
60
50
40
20
1.4
1.3
1.1
1.0
90
80
70
60
50
40
30
20
10
80
30
10
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 (%)
40
25
50
60
3 3.5 4 4.5
75
80
100
38511 G14
38511 G17
38511 G20
125
100
5
–10
–20
806
804
802
800
798
796
794
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
0.5
75
0.6
100
0.7
38511 G15
38511 G21
38511 G18
38511f
125
2.4
0.8