ltc3890 Linear Technology Corporation, ltc3890 Datasheet - Page 6

• Manufacturer Part Number: ltc3890
• Description: 60v Low Iq, Dual, 2-phase Synchronous Step-down Dc/dc Controller
• Manufacturer: Linear Technology Corporation

LTC3890
TYPICAL PERFORMANCE CHARACTERISTICS
6
–40
300
250
200
150
100
–20
80
60
40
20
50
80
70
60
50
40
30
20
10
0
0
0
0
5
0
Total Input Supply Current vs
Input Voltage
Maximum Current Sense Voltage
vs I
Foldback Current Limit
FORCED CONTINUOUS MODE
10
100
0.2
TH
300μA
PULSE SKIPPING MODE
15
Voltage
OPERATION
Burst Mode
200
20
FEEDBACK VOLTAGE (MV)
0.4
I
INPUT VOLTAGE (V)
LIM
NO LOAD
25
300
= FLOAT
30 35 40 45 50 55 60 65
0.6
V
I
ITH
LIM
400 500
0.8
(V)
= INTV
I
I
LIM
LIM
I
LIM
I
CC
1.0
LIM
= INTV
= GND
600
= GND
= FLOAT
1.2
CC
700
3890 G13
3890 G10
3890 G16
1.4
800
–100
–500
–600
–700
–800
–200
–300
–400
6.0
5.8
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
80
75
70
65
60
55
50
45
40
0
–45
–45
EXTV
Voltages vs Temperature
SENSE
0
Quiescent Current vs Temperature
–20
–20
V
SENSE
CC
5
–
Switchover and INTV
Pin Input Bias Current
COMMON MODE VOLTAGE (V)
5
5
TEMPERATURE (°C)
TEMPERATURE (°C)
10
EXTV
EXTV
30
30
INTV
CC
CC
15
55
55
FALLING
RISING
CC
80
80
20
105
105
CC
25
3890 G11
3890 G17
3890 G14
130
130
5.20
5.15
5.10
5.05
5.00
4.95
5.2
5.1
5.0
4.9
4.8
30
20
80
70
60
50
40
0
0
5
INTV
Maximum Current Sense
Threshold vs Duty Cycle
INTV
V
IN
10
20 40 60 80 100 120 140
10
= 12V
CC
CC
15
20
Line Regulation
vs Load Current
20
I
I
LIM
LOAD CURRENT (mA)
LIM
30
I
INPUT VOLTAGE (V)
LIM
25
DUTY CYCLE (%)
= INTV
= FLOAT
40 50
= GND
30 35 40 45 50 55 60 65
EXTV
EXTV
CC
CC
CC
= 8.5V
60
= 0V
70
160
80
180 200
90
3890 G18
3890 G12
3890 G15
3890f
100