LTC3853 Linear Technology, LTC3853 Datasheet - Page 6

• Manufacturer Part Number: LTC3853
• Description: Multiphase Synchronous Step-Down Controller
• Manufacturer: Linear Technology

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LTC3853
TYPICAL PERFORMANCE CHARACTERISTICS
6
Prebiased Output at 2V
4.5
4.0
6.0
5.5
5.0
70
60
40
30
20
80
50
10
0
5
0
Maximum Current Sense Threshold
vs Common Mode Voltage
Quiescent Current
vs Input Voltage Without EXTV
V
SENSE
50ms/DIV
1
10
COMMON MODE VOLTAGE (V)
INPUT VOLTAGE (V)
I
I
LIM
LIM
I
LIM
2
= INTV
= FLOAT
15
= GND
CC
3
3853 G08
20
4
V
1V/DIV
V
500mV/DIV
V
500mV/DIV
OUT
TK/SS
FB
3853 G11
CC
3853 G14
25
5
V
OUT1,2,3
2V/DIV
1V/DIV
5.25
5.00
4.75
4.50
4.25
3.75
3.50
4.00
100
RUN1
90
80
70
60
50
40
30
20
10
0
0
0
Maximum Current Sense
Threshold vs Duty Cycle
Internal V
V
V
V
V
Coincident Tracking
IN
OUT1
OUT2
OUT3
= 12V
20
5
= 3.3V
= 2.5V
= 1.8V
CC
INPUT VOLTAGE (V)
DUTY CYCLE (%)
I
I
LIM
Line Regulation
LIM
I
10
40
LIM
10ms/DIV
= INTV
= FLOAT
= GND
15
60
CC
20
80
3853 G12
3853 G15
3853 G09
100
25
V
OUT1,2,3
TK/SS1
TK/SS2
TK/SS3
2V/DIV
1V/DIV
–20
–40
60
50
30
80
60
40
20
80
70
40
20
10
0
0
0
Maximum Current Sense Voltage vs
Feedback Voltage (Current Foldback)
Current Sense Threshold
vs I
0
Tracking Up and Down
with External Ramp
V
V
V
V
0.1
IN
OUT1
OUT2
OUT3
TH
= 12V
Voltage
0.2
= 3.3V
= 2.5V
= 1.8V
0.5
FEEDBACK VOLTAGE (V)
0.3
I
LIM
0.4
V
= FLOAT
ITH
I
I
I
5ms/DIV
LIM
LIM
LIM
1
0.5
(V)
= INTV
= FLOAT
= GND
I
I
LIM
LIM
0.6
= INTV
= GND
CC
1.5
0.7
CC
0.8
3853 G13
3853 G16
3853 G10
3853f
0.9
2