lt3681 Linear Technology Corporation, lt3681 Datasheet - Page 6

• Manufacturer Part Number: lt3681
• Description: 36v, 2a, 2.8mhz Step-down Switching Regulator With Integrated Power Schottky Diode
• Manufacturer: Linear Technology Corporation

10mV/DIV
LT3681
TYPICAL PERFOR A CE CHARACTERISTICS
0.5A/DIV
6
V
RUN/SS
5V/DIV
V
–40
2.50
2.00
1.00
0.50
100
–20
–60
–80
1.50
OUT
80
60
40
20
I
0
L
1.065
0
–50
Switching Waveforms; Transition
from Burst Mode to Full
Frequency
Error Amp Output Current
V
V
I
LOAD
C
IN
Voltages
= 12V; FRONT PAGE APPLICATION
–25
= 140mA
CURRENT LIMIT CLAMP
1.165
SWITCHING THRESHOLD
FB PIN VOLTAGE (V)
0
TEMPERATURE (°C)
1 .265
25
1µs/DIV
50
1.365
75
W
100
1.465
3681 G19
3681 G22
3681 G25
U
125
10mV/DIV
0.5A/DIV
V
RUN/SS
5V/DIV
1.200
1.180
1.140
1.100
1.160
1.120
V
OUT
4.5
4.0
3.5
3.0
2.5
2.0
I
L
0.001
–50
Power Good Threshold
Minimum Input Voltage
Switching Waveforms; Full
Frequency Continuous Operation
V
I
LOAD
V
L = 4.7
f = 800kHz
PG RISING
IN
OUT
= 12V; FRONT PAGE APPLICATION
–25
= 1A
= 3.3V
0.01
0
LOAD CURRENT (A)
TEMPERATURE (°C)
25
1µs/DIV
0.1
50
75
1
100
T
A
3681 G20
3681 G23
3681 G26
= 25°C unless otherwise noted.
125
10
10mV/DIV
0.5A/DIV
5V/DIV
V
6000
5000
4000
3000
2000
1000
V
OUT
SW
6.5
6.0
5.5
5.0
4.5
4.0
I
L
0
0.001
0
Minimum Input Voltage
Switching Waveforms;
Burst Mode
Power Schottky Diode Forward
Voltage vs Current
V
I
LOAD
V
L = 4.7
f = 800kHz
IN
OUT
= 12V; FRONT PAGE APPLICATION
0.1
= 10mA
= 5.0V
0.01
FORWARD VOLTAGE (V)
0.2
LOAD CURRENT (A)
0.3
2µs/DIV
0.1
0.4
0.5
1
0.6
3681 G29
3681 G20
3681 G24
3681f
0.7
10