LTC3731H Linear Technology, LTC3731H Datasheet - Page 5

• Manufacturer Part Number: LTC3731H
• Description: Synchronous Buck Switching Regulator Controller
• Manufacturer: Linear Technology

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TYPICAL PERFOR A CE CHARACTERISTICS
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
0
= 2.4V
= 0V
0
TEMPERATURE (°C)
TEMPERATURE (°C)
= 0V
1
25
25
OUT
V
PLLFLTR
50
50
(Figure 14)
75
75
= 5V
10
V
V
100
100
W
IN
OUT
= 8V
= 1.5V
3731H G01
125
125
3731H G07
3731H G04
U
100
150
150
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)
0
I
L
TEMPERATURE (°C)
= 45A
25
10
1
IN
V
IN
(Figure 14)
50
(V)
I
L
1.5
15
= 15A
75
V
f = 225kHz
100
PLLFLTR
OUT
20
2
= 1.5V
125
3731H G02
3731H G05
3731H G08
150
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
–25
–25
IN
IN
= 5V
= 12V
= 20V
300
0
0
TEMPERATURE (°C)
V
TEMPERATURE (°C)
FREQUENCY (kHz)
O
SENSE
= 1.75V
25
25
LTC3731H
400
50
50
Threshold vs
V
O
= 0.6V
75
75
I
V
LOAD
500
OUT
100
100
V
= 1.5V
IN
= 20A
125
125
3731H G09
3731H G03
3731H G06
= 8V
3731hf
5
600
150
150