LT3685 LINER [Linear Technology], LT3685 Datasheet - Page 7

• Manufacturer Part Number: LT3685
• Description: 36V, 4A, 1.5MHz Synchronous Step-Down Switching Regulator
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFORMANCE CHARACTERISTICS
–1.4
–1.6
–1.8
–2.0
–2.2
–2.4
–2.6
–2.8
–3.0
–20
–40
–60
60
40
20
10
8
6
4
2
0
0
–50
0.6
0
UVLO Pin Current vs Temperature
(V
Error Amp Output Current vs V
EN Pin Current vs V
UVLO
–25
5
= 1.33V)
0.7
10
0
EN PIN VOLTAGE (V)
FB PIN VOLTAGE (V)
TEMPERATURE (°C)
15
25
0.8
20
50
EN
25
75
0.9
100
30
FB
3690 G23
3690 G17
3690 G20
125
1.0
35
0.82
0.81
0.80
0.79
0.78
2.5
2.0
1.5
1.0
0.5
2.5
2.0
1.5
1.0
0.5
0
0
–50
–50
–50
EN Threshold Voltage
V
Feedback Voltage vs Temperature
C
Voltages vs Temperature
–25
–25
–25
CURRENT LIMIT CLAMP
0
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
SWITCHING THRESHOLD
25
25
25
50
50
50
75
75
75
100
100
100
T
3690 G18
3690 G21
3690 G24
A
= 25°C, unless otherwise noted.
125
125
125
800
700
600
500
400
300
200
100
2.5
2.0
1.5
1.0
0.5
95
90
85
80
75
0
0
–50
–50
0
UVLO Threshold Voltage
vs Temperature
Frequency Foldback vs V
Power Good Threshold
vs Temperature
R
T
= 32.4k
0.1
–25
–25
0.2
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
FB PIN VOLTAGE (V)
0.3
25
25
0.4
50
50
LT3690
0.5
75
75
0.6
FB
100
100
0.7
3690 G19
3690 G22
3690 G25
7
3690f
125
125
0.8