ltc3858-2 Linear Technology Corporation, ltc3858-2 Datasheet - Page 6

• Manufacturer Part Number: ltc3858-2
• Description: Ltc3858-2 - Low Iq, Dual 2-phase Synchronous Step-down Controller
• Manufacturer: Linear Technology Corporation

LTC3858-2
TYPICAL PERFORMANCE CHARACTERISTICS
6
400
350
300
250
200
150
100
–20
–40
90
80
70
60
50
40
30
20
10
50
80
60
40
20
0
0
0
5
0
0
Total Input Supply Current
vs Input Voltage
Maximum Current Sense Voltage
vs I
Foldback Current Limit
0.1
TH
10
0.2
PULSE-SKIPPING
FORCED CONTINUOUS
Burst Mode OPERATION
(FALLING)
Burst Mode OPERATION
(RISING)
Voltage
0.2
FEEDBACK VOLTAGE (V)
15
0.4
INPUT VOLTAGE (V)
0.3
I
TH
0.6
PIN VOLTAGE
20
0.4
300μA LOAD
I
0.5
NO LOAD
25
I
LIM
0.8
FIGURE 12 CIRCUIT
V
ONE CHANNEL ON
LIM
I
I
I
OUT
LIM
LIM
LIM
I
5% DUTY CYCLE
LIM
= INTV
0.6
= FLOAT
= FLOAT
= INTV
= 3.3V
= GND
30
1.0
= GND
0.7
CC
CC
35
1.2
0.8
38582 G10
38582 G16
38582 G13
40
0.9
1.4
–100
–150
–450
–500
–550
–600
–200
–250
–300
–350
–400
–50
230
210
190
170
150
130
110
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
0
–45
–45
EXTV
Voltages vs Temperature
SENSE
0
Quiescent Current vs Temperature
PLLIN/MODE = 0
V
V
ONE CHANNEL ON
IN
OUT
–20
V
–20
= 12V
SENSE
CC
= 3.3V
5
–
Switchover and INTV
Pin Input Bias Current
COMMON MODE VOLTAGE (V)
5
5
TEMPERATURE (°C)
TEMPERATURE (°C)
EXTV
EXTV
10
30
30
INTV
CC
CC
FALLING
RISING
15
CC
55
55
80
20
80
105
105
CC
38582 G14
25
38582 G11
38582 G17
130
130
5.2
5.1
5.0
5.2
5.1
80
60
40
20
10
9
4
0
8
7
6
5
–45
0
INTV
0
Maximum Current Sense
Threshold vs Duty Cycle
Shutdown Current vs Temperature
10
–20
5
CC
20
Line Regulation
10
I
I
LIM
5
LIM
30
I
TEMPERATURE (°C)
INPUT VOLTAGE (V)
LIM
DUTY CYCLE (%)
15
= INTV
= FLOAT
= GND
40 50
30
20
CC
55
60
25
70
80
30
80
105
35
38582 G12
38582 G15
38582 G18
90
38582f
100
130
40