Datasheet

LT3995
6
3995f
For more information www.linear.com/LT3995
TYPICAL PERFORMANCE CHARACTERISTICS
Switching Frequency
R
T
Programmed Switching
Frequency
Frequency Foldback
Internal Undervoltage Lockout
(UVLO) EN Threshold
PG Thresholds
Minimum Input Voltage,
V
OUT
= 5V
Minimum Input Voltage,
V
OUT
= 3.3V
T
A
= 25°C, unless otherwise noted.
TEMPERATURE (°C)
–55
SWITCHING FREQUENCY (kHz)
660
720
780
35 95
3995 G19
600
540
–25 5
65 125 155
480
420
R
T
= 78.7k
SWITCHING FREQUENCY (MHz)
0.2
0
R
T
RESISTOR (kΩ)
50
150
200
250
350
0.4
1.2
1.6
3995 G20
100
300
1.0
2.0
2.2
0.6
0.8
1.4 1.8
FB PIN VOLTAGE (V)
0
700
600
500
400
300
200
100
0
0.6 1
3995 G21
0.2 0.4
0.8 1.2
SWITCHING FREQUENCY (kHz)
R
T
= 78.7k
TEMPERATURE (°C)
–55
INPUT VOLTAGE (V)
4
5
6
35 95
3995 G22
3
2
–25 5
65 125 155
1
0
TEMPERATURE (°C)
–55
EN THRESHOLD (V)
1.08
35
3995 G23
1.05
1.03
–25 5 65
1.02
1.01
1.09
1.07
1.06
1.04
95 125 155
EN RISING
EN FALLING
TEMPERATURE (°C)
–55
PG THRESHOLD (V)
1.11
35
3995 G24
1.08
1.06
–25 5 65
1.05
1.04
1.12
1.10
1.09
1.07
95 125 155
FB RISING
FB FALLING
LOAD CURRENT (A)
0
4.0
INPUT VOLTAGE (V)
4.5
5.0
5.5
6.0
6.5
0.5
1.0 1.5 2.0
3995 G25
2.5 3.0
V
OUT
= 5V
f
SW
= 500kHz
TO RUN/TO START
LOAD CURRENT (A)
0
2.5
INPUT VOLTAGE (V)
3.0
3.5
4.0
4.5
5.0
0.5
1.0 1.5 2.0
3995 G26
2.5 3.0
V
OUT
= 3.3V
FRONT PAGE APPLICATION
TO RUN/TO START
Minimum Off-Time
TEMPERATURE (°C)
–55
MINIMUM OFF-TIME (ns)
200
225
250
35 95
3995 G18
175
150
–25 5
65 125 155
125
100
LOAD = 2A
LOAD = 1A
V
SYNC
= 0V
f
SW
= 2MHz