LT1965 Series
typical perForMance characteristics
Ripple Rejection vs Temperature
LT1965 Minimum Input Voltage
Load Regulation
0
–5
100
90
80
70
60
50
40
30
20
10
0
2.5
2.0
1.5
1.0
0.5
0
LT1965
LT1965-1.5
–10
–15
–20
–25
–30
–35
–40
–45
–50
I
L
= 1A
LT1965-1.8
I
L
= 1.1A
LT1965-2.5
LT1965-3.3
I
L
= 500mA
I
L
= 100mA
V
= V
+ 1V
IN
OUT(NOMINAL)
I
= 0.75A
(LT1965-1.5/-1.8/-2.5/-3.3)
V = 2.3V (LT1965)
IN
L
V
= V
+ 1V + 0.5
IN
OUT(NOMINAL)
P-P
RIPPLE AT f = 120Hz
∆I = 1mA TO 1.1A
L
–50 –25
0
25 50 75 100 125 150
–50 –25
0
25 50 75 100 125 150
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
1965 G35
1965 G37
1965 G36
RMS Output Noise vs Load
Current (10Hz to 100kHz)
LT1965-1.8 10Hz to 100kHz
Output Noise
Output Noise Spectral Density
1.00
0.10
0.01
80
70
60
50
40
30
20
10
0
C
I
= 10µF
C
I
= 10µF
OUT
L
OUT
L
= 1.1A
= 1.1A
LT1965-2.5
LT1965-1.5
LT1965-3.3
LT1965-2.5
LT1965-1.8
LT1965-3.3
LT1965
V
OUT
100µV/DIV
LT1965-1.8
LT1965
1965 G40
400µs/DIV
LT1965-1.5
10
100
1k
10k
100k
0.0001 0.001
0.01
0.1
1
10
LOAD CURRENT (A)
FREQUENCY (Hz)
1965 G38
1965 G39
LT1965-2.5 SHDN Transient
Response
LT1965-3.3 Transient Response
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
100
50
V
= 3.3V
OUT
SHDN
0
–50
–100
1.5
V
C
C
= 4.3V
IN
IN
= 10µF CERAMIC
OUTPUT
1.0
0.5
0
= 10µF CERAMIC
OUT
0
10 20 30 40 50 60 70 80
0
10 20 30 40 50 60 70 80 90 100
TIME (µs)
TIME (µs)
1965 G41
1965 G42
V
C
= 3.3V
= 10µF CERAMIC
= 2.5k, I = 1mA FOR V
IN
OUT
L
R
= 2.5V
L
OUT
1965fb
10
For more information www.linear.com/LT1965
Linear Systems [ Linear Systems ]
