LTC3731 Linear Technology, LTC3731 Datasheet - Page 6

• Manufacturer Part Number: LTC3731
• Description: Synchronous Buck Switching Regulator Controller
• Manufacturer: Linear Technology

www.DataSheet4U.com
LTC3731
TYPICAL PERFOR A CE CHARACTERISTICS
6
100
610
605
600
595
590
700
600
500
400
300
200
100
90
80
70
60
50
40
30
20
10
0
0
–50
–50
Efficiency vs I
0.1
Reference Voltage vs
Temperature
Oscillator Frequency vs
Temperature
V
V
V
V
FCB
FCB
V
PLLFLTR
PLLFLTR
PLLFLTR
–25
–25
= OPEN
= 5V
V
INDUCTOR CURRENT (A)
= 1.2V
FCB
= 2.4V
= 0V
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
= 0V
1
OUT
25
25
V
PLLFLTR
(Figure 14)
50
50
10
= 5V
75
75
V
V
W
IN
OUT
= 8V
100
= 1.5V
100
3731 G01
3731 G07
3731 G04
U
100
125
125
700
600
500
400
300
200
100
6.0
5.5
5.0
4.0
4.5
95
90
85
80
75
70
65
60
55
50
–50
Efficiency vs V
0
0
Error Amplifier gm vs
Temperature
Operating Frequency vs V
–25
0.5
5
PLLFLTR PIN VOLTAGE (V)
I
L
0
TEMPERATURE (°C)
= 45A
10
1
25
IN
V
IN
(Figure 14)
(V)
I
L
50
1.5
15
= 15A
75
V
f = 250kHz
PLLFLTR
OUT
20
2
100
= 1.5V
3731 G02
3731 G05
3731 G08
125
2.5
25
100
85
80
75
70
65
95
90
85
80
75
4
3
2
0
5
1
200
–50
–50
Efficiency vs Frequency (Figure 14)
Maximum I
Temperature
Undervoltage Reset Voltage vs
Temperature
V
V
V
IN
IN
IN
–25
–25
= 5V
= 12V
= 20V
300
TEMPERATURE (°C)
V
0
TEMPERATURE (°C)
0
FREQUENCY (kHz)
O
SENSE
= 1.75V
25
25
400
Threshold vs
V
O
50
50
= 0.6V
I
V
75
75
LOAD
500
OUT
V
= 1.5V
IN
= 20A
100
100
3731 G09
3731 G03
3731 G06
= 8V
3731fa
600
125
125