lt3641 Linear Technology Corporation, lt3641 Datasheet - Page 6

• Manufacturer Part Number: lt3641
• Description: Dual Monolithic Buck Regulator With Power-on Reset And Watchdog Timer
• Manufacturer: Linear Technology Corporation

LT3641
TYPICAL PERFORMANCE CHARACTERISTICS
6
700
600
500
400
300
200
100
2.5
2.0
1.5
2.0
1.5
1.0
0.5
0.0
1.0
0.5
0
0
0
0
HV Channel Switching Frequency
(V
LV Channel Peak Current Limit
vs Duty Cycle
0
FB2 Voltage vs SS2
R
V
OUT1
T
IN
= 32.4k
= 12V
V
0.2
200
IN
20
= 3.3V)
= 24V
V
SS2 VOLTAGE (mV)
0.4
OUT1
DUTY CYCLE (%)
400
V
40
IN
CURRENT (A)
= 16V
0.6
6000
60
0.8
800
80
1.0
3641 G10
3641 G13
3641 G16
1000
100
1.2
0.52
0.51
0.50
0.49
0.48
450
400
350
300
250
200
150
100
2.5
2.0
1.5
1.0
0.5
50
0
0
–50
0
LV Channel Switching Frequency
(V
Switching Frequency
vs Temperature
0
LV Channel Switch Voltage
Drop vs Current (V
R
V
T
OUT2
IN2
= 182k
= 3.3V
V
IN2
0.2
= 1.8V)
0
= 5V
TEMPERATURE (°C)
V
0.5
SW2 CURRENT (A)
OUT2
0.4
CURRENT (A)
PMOS
50
IN2
0.6
= 3.3V)
NMOS
1
100
0.8
T
3641 G14
3641 G11
3641 G17
A
= 25°C, unless otherwise noted.
150
1.5
1.0
0.45
0.40
0.30
0.25
0.20
0.35
0.15
0.10
0.05
2.5
2.0
1.5
0.0
1.0
0.5
30
25
20
15
10
0
5
0
0
0
HV Channel Current Limit
vs Duty Cycle
V
Full Frequency (V
0
EN2 Current vs Voltage
OUT1
5
20
Minimum Load to Run at
10
DUTY CYCLE (%)
EN2 VOLTAGE (V)
V
2
IN
40
VOLTAGE (V)
2.5MHz
15
OUT1
60
20
= 3.3V)
4
2MHz
80
25
3641 G17a
3641 G12
3641 G15
3641f
100
30
6