ltc3869gn-2 Linear Technology Corporation, ltc3869gn-2 Datasheet - Page 6

• Manufacturer Part Number: ltc3869gn-2
• Description: Ltc3869/ltc3869-2 - Dual, 2-phase Synchronous Step-down Dc/dc Controllers
• Manufacturer: Linear Technology Corporation

LTC3869/LTC3869-2
TYPICAL PERFORMANCE CHARACTERISTICS
500mA/DIV
6
TK/SS1
TK/SS2
2V/DIV
V
V
–20
–40
OUT1
OUT2
80
60
40
20
0
0
Current Sense Threshold
vs I
Tracking Up and Down
with External Ramp
V
V
V
IN
OUT1
OUT2
TH
= 12V
Voltage
= 1.8V, 1.5 LOAD
= 1.2V, 1 LOAD
0.5
I
LIM
= FLOAT
V
70
60
40
30
20
90
80
50
10
ITH
10ms/DIV
0
1
0
V
V
Maximum Current Sense Voltage
vs Feedback Voltage (Current
Foldback)
I
(V)
OUT1
OUT2
LIM
= INTV
0.1
I
LIM
1.5
= GND
FEEDBACK VOLTAGE (V)
CC
0.2
3869 G13
I
I
LIM
3869 G10
LIM
I
LIM
0.3
2
= INTV
= FLOAT
= GND
0.4
CC
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
40
80
70
60
50
30
20
10
0
0
–50
0.5
0
Maximum Current Sense
Threshold vs Common Mode
Voltage
Quiescent Current without EXTV
vs Temperature
3869 G16
–25
V
SENSE
0.6
2
0
COMMON MODE VOLTAGE (V)
TEMPERATURE (°C)
4
I
I
LIM
LIM
I
25
LIM
= INTV
= FLOAT
= GND
6
50
CC
8
1.6
1.4
1.2
1.0
75
–50
TK/SS Pull-Up Current
vs Temperature
10
100
–25
3869 G11
T
3869 G14
A
CC
125
= 25°C, unless otherwise noted.
12
0
TEMPERATURE (°C)
25
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
80
70
60
50
40
30
20
10
0
50
0
0
INTV
Maximum Current Sense
Threshold vs Duty Cycle
75
CC
20
Line Regulation
10
100
INPUT VOLTAGE (V)
3869 G17
DUTY CYCLE (%)
I
I
LIM
125
LIM
40
I
LIM
= INTV
= FLOAT
20
= GND
60
CC
30
80
3869 G12
3869 G15
3869f
100
40