LTC3858 Linear Technology, LTC3858 Datasheet - Page 6

• Manufacturer Part Number: LTC3858
• Description: Synchronous Step-Down Controller
• Manufacturer: Linear Technology

LTC3858
Typical perForMance characTerisTics

–20
–40
400
350
300
250
200
150
100
90
80
70
60
50
40
30
20
10
80
60
40
20
50
0
0
0
0
0
5
Total Input Supply Current
vs Input Voltage
Maximum Current Sense Voltage
vs I
Foldback Current Limit
0.1
TH
0.2
10
PULSE SKIPPING
FORCED CONTINUOUS
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
0.4
20
300µA LOAD
I
0.5
I
LIM
0.8
NO LOAD
25
LIM
FIGURE 12 CIRCUIT
V
ONE CHANNEL ON
I
I
I
LIM
LIM
LIM
OUT
I
5% DUTY CYCLE
= INTV
LIM
= FLOAT
0.6
= FLOAT
= GND
= INTV
1.0
= 3.3V
30
= GND
0.7
CC
CC
1.2
35
0.8
3858 G16
3858 G13
3858 G10
1.4
0.9
40
–100
–150
–200
–250
–300
–350
–400
–450
–500
–550
–600
–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
0
EXTV
Voltages vs Temperature
SENSE
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
10
EXTV
30
30
INTV
CC
CC
FALLING
RISING
15
CC
55
55
80
20
80
105
105
CC
25
3858 G14
3858 G11
3858 G17
130
130
5.2
5.1
5.0
5.2
5.1
10
80
40
20
60
9
6
4
0
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
www.DataSheet4U.com
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
90
3858 G18
3858 G12
3858 G15
3858fa
100
130
40