Datasheet

LT1965 Series
10
1965fb
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typical perForMance characteristics
Load Regulation
Output Noise Spectral Density
RMS Output Noise vs Load
Current (10Hz to 100kHz)
LT1965-1.8 10Hz to 100kHz
Output Noise
LT1965-3.3 Transient Response
LT1965-2.5 SHDN Transient
Response
Ripple Rejection vs Temperature LT1965 Minimum Input Voltage
RIPPLE REJECTION (dB)
100
1965 G35
TEMPERATURE (°C)
–50 –25 0 25 50 75 125100 150
0
20
40
60
80
10
30
50
70
90
I
L
= 0.75A
V
IN
= V
OUT(NOMINAL)
+ 1V + 0.5
P-P
RIPPLE AT f = 120Hz
I
L
= 1.1A
–50 –25 0 25 50 75 125100 150
0
MINIMUM INPUT VOLTAGE (V)
0.5
1.0
1.5
2.0
2.5
1965 G36
TEMPERATURE (°C)
I
L
= 100mA
I
L
= 1A
I
L
= 500mA
LOAD REGULATION (mV)
–30
–25
–20
–15
–50
–45
–40
–35
–10
–5
0
1965 G37
TEMPERATURE (°C)
LT1965
V
IN
= V
OUT(NOMINAL)
+ 1V
(LT1965-1.5/-1.8/-2.5/-3.3)
V
IN
= 2.3V (LT1965)
∆I
L
= 1mA TO 1.1A
LT1965-3.3
–50 –25 0 25 50 75 125100 150
LT1965-1.5
LT1965-1.8
LT1965-2.5
0.01
0.10
1.00
FREQUENCY (Hz)
10
OUTPUT NOISE SPECTRAL DENSITY (µV Hz)
100 1k 10k 100k
1965 G38
LT1965-3.3
LT1965
LT1965-1.5
LT1965-1.8
LT1965-2.5
C
OUT
= 10µF
I
L
= 1.1A
LOAD CURRENT (A)
20
OUTPUT NOISE VOLTAGE (µV
RMS
)
30
50
70
80
0.0001 0.01 0.1 10
10
0.001
1
60
40
0
1965 G39
LT1965-2.5
LT1965-3.3
LT1965-1.8
LT1965
C
OUT
= 10µF
I
L
= 1.1A
LT1965-1.5
400µs/DIV
V
OUT
100µV/DIV
1965 G40
0
0
–100
OUTPUT VOLTAGE
DEVIATION (mV)
LOAD CURRENT (A)
–50
0
50
100
0.5
1.0
1.5
10 20 30 40
50 60 70 80
1965 G41
TIME (µs)
V
IN
= 4.3V
C
IN
= 10µF CERAMIC
C
OUT
= 10µF CERAMIC
V
OUT
= 3.3V
TIME (µs)
0
SHDN AND OUTPUT VOLTAGE (V)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
8020 40 60 1007010 30 50 90
1965 G42
OUTPUT
SHDN
V
IN
= 3.3V
C
OUT
= 10µF CERAMIC
R
L
= 2.5k, I
L
= 1mA FOR V
OUT
= 2.5V