lt3640 Linear Technology Corporation, lt3640 Datasheet - Page 6

• Manufacturer Part Number: lt3640
• Description: Dual Monolithic Buck Regulator With Power-on Reset And Watchdog Timer
• Manufacturer: Linear Technology Corporation

LT3640
TYPICAL PERFORMANCE CHARACTERISTICS
6
700
600
500
400
300
200
100
2.0
1.5
1.0
0.5
0.0
0
0
0
LV Channel Peak Current Limit
vs Duty Cycle
FB2 Voltage vs SS2
200
20
SS2 VOLTAGE (mV)
DUTY CYCLE (%)
400
40
2.5
2.0
1.5
1.0
0.5
0
6000
HV Channel Switching Frequency
(V
0
60
V
OUT1
IN
= 12V
V
0.2
IN
800
= 3.3V)
80
= 24V
V
3640 G10
3640 G13
0.4
OUT1
V
1000
100
IN
CURRENT (A)
= 16V
0.6
0.8
0.52
0.51
0.50
0.49
0.48
450
400
350
300
250
200
150
100
50
0
–50
0
Switching Frequency
vs Temperature
LV Channel Switch Voltage
Drop vs Current (V
1.0
3640 G16
1.2
0
TEMPERATURE (°C)
0.5
SW2 CURRENT (A)
PMOS
50
IN2
= 3.3V)
NMOS
1
100
2.5
2.0
1.5
1.0
0.5
0
LV Channel Switching Frequency
(V
0
T
3640 G14
3640 G11
V
A
OUT2
IN2
= 25°C, unless otherwise noted.
150
1.5
V
= 3.3V
IN2
0.2
= 1.8V)
= 5V
V
OUT2
0.45
0.40
0.30
0.25
0.20
0.4
0.35
0.15
0.10
0.05
2.5
2.0
1.5
0.0
1.0
0.5
CURRENT (A)
0
0
0
HV Channel Current Limit
vs Duty Cycle
V
Full Frequency (V
OUT1
0.6
5
20
Minimum Load to Run at
0.8
10
DUTY CYCLE (%)
V
IN
40
3640 G17
VOLTAGE (V)
2.5MHz
15
1.0
OUT1
60
20
= 3.3V)
2MHz
80
25
3640 G12
3640 G15
3640p
100
30