LT3640EFE LINER [Linear Technology], LT3640EFE Datasheet - Page 7

• Manufacturer Part Number: LT3640EFE
• Description: Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFORMANCE CHARACTERISTICS
0.5A/DIV
0.5A/DIV
10V/DIV
5V/DIV
SW1
SW2
I
I
L1
L2
V
V
Full Frequency Waveforms
IN1
OUT1
= 12V
= 3.3V/0.5A
200ns/DIV
V
V
IN2
OUT2
35
30
20
15
10
25
0
5
–50
= V
Watchdog Upper Boundary
Period vs Temperature
= 1.8V/0.5A
OUT1
0
TEMPERATURE (°C)
3640 G18
50
0.5A/DIV
0.5A/DIV
10V/DIV
5V/DIV
SW1
SW2
100
I
I
L1
L2
V
V
PFM Operation Waveforms
IN1
OUT1
3640 G21
= 12V
= 3.3V/25mA
150
200ns/DIV
V
V
IN2
OUT2
= V
= 1.8V/30mA
OUT1
20
15
10
5
0
0
RST/WDO Pull-Up Current
T
A
3640 G19
= 25°C, unless otherwise noted.
0.5
RST/WDO VOLTAGE (V)
1
180
160
120
140
100
80
60
40
20
0
0
Watchdog Upper Boundary
Period vs C
1.5
1000
C
3640 G22
WDT
WDT
2000
CAPACITANCE (pF)
2
3000
LT3640
4000
3640 G20
7
3640p
5000