LTC3868 Linear Technology, LTC3868 Datasheet - Page 6

• Manufacturer Part Number: LTC3868
• Description: Low IQ Dual 2-Phase Synchronous Step-Down Controller
• Manufacturer: Linear Technology

LTC3868
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
PULSE-SKIPPING
FORCED CONTINUOUS
Burst Mode OPERATION
(FALLING)
Burst Mode OPERATION
(RISING)
Voltage
0.2
10
FEEDBACK VOLTAGE (V)
0.4
INPUT VOLTAGE (V)
0.3
I
TH
300µA LOAD
NO LOAD
0.6
PIN VOLTAGE
15
0.4
I
0.5
I
LIM
0.8
LIM
FIGURE 12 CIRCUIT
V
ONE CHANNEL ON
I
I
I
LIM
LIM
LIM
OUT
I
5% DUTY CYCLE
= INTV
LIM
20
= FLOAT
0.6
= FLOAT
= GND
= INTV
1.0
= 3.3V
= GND
0.7
CC
CC
1.2
25
0.8
3868 G16
3868 G13
3868 G10
1.4
0.9
28
–100
–150
–200
–250
–300
–350
–400
–450
–500
–550
–600
240
230
220
210
200
190
180
170
160
150
140
130
120
110
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
–50
–45
0
–45
EXTV
Voltages vs Temperature
SENSE
Quiescent Current vs Temperature
0
PLLIN/MODE = 0
V
V
ONE CHANNEL ON
IN
OUT
–20
–20
V
= 12V
SENSE
CC
= 3.3V
–
Switchover and INTV
Pin Input Bias Current
5
5
COMMON MODE VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
EXTV
EXTV
5
30
30
INTV
CC
CC
FALLING
RISING
CC
55
55
10
80
80
105
105
CC
3868 G11
3868 G17
3868 G14
130
130
15
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
CC
5
20
Line Regulation
www.DataSheet4U.com
I
I
LIM
5
LIM
30
I
TEMPERATURE (°C)
INPUT VOLTAGE (V)
LIM
DUTY CYCLE (%)
10
= INTV
= FLOAT
= GND
40 50
30
CC
15
55
60
70
80
20
80
105
25 28
90
3868 G18
3868 G12
3868 G15
3868fb
100
130