LTC3858-1 Linear Technology Corporation, LTC3858-1 Datasheet - Page 6

• Manufacturer Part Number: LTC3858-1
• Description: Dual 2-Phase Synchronous Step-Down Controller
• Manufacturer: Linear Technology Corporation

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LTC3858-1
TYPICAL PERFORMANCE CHARACTERISTICS
6
–40
400
350
300
250
200
150
100
–20
90
80
70
60
50
40
30
20
10
80
60
40
20
50
0
0
0
0
5
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 MODE
FORCED CONTINUOUS MODE
Burst Mode OPERATION
(FALLING)
Burst Mode OPERATION
(RISING)
Voltage
0.2
FEEDBACK VOLTAGE (V)
0.4
15
INPUT VOLTAGE (V)
0.3
I
TH
0.6
PIN VOLTAGE
20
0.4
300μA LOAD
0.5
0.8
NO LOAD
25
FIGURE 12 CIRCUIT
V
ONE CHANNEL ON
10% DUTY CYCLE
OUT
0.6
1.0
= 3.3V
30
0.7
1.2
35
0.8
3858 G16
3858 G13
3858 G10
1.4
40
0.9
–100
–150
–200
–250
–300
–350
–400
–450
–500
–550
–600
–50
230
210
190
170
150
130
110
4.4
5.6
5.4
5.2
5.0
4.8
4.6
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
5
COMMON MODE VOLTAGE (V)
5
TEMPERATURE (°C)
TEMPERATURE (°C)
EXTV
EXTV
10
30
30
INTV
CC
CC
FALLING
RISING
15
CC
55
55
80
80
20
105
105
CC
25
3858 G11
3858 G14
3858 G17
130
130
5.2
5.1
5.0
5.2
5.1
80
40
20
10
60
0
9
6
4
8
7
5
–45
0
0
INTV
Maximum Current Sense
Threshold vs Duty Cycle
Shutdown Current vs Temperature
10
–20
5
CC
20
Line Regulation
10
30
5
INPUT VOLTAGE (V)
TEMPERATURE (°C)
DUTY CYCLE (%)
15
40 50
30
20
55
60
25
70
80
30
80
105
35
90
3858 G12
3858 G15
3858 G18
38581f
100
130
40