LT1963 Series
TYPICAL PERFOR A CE CHARACTERISTICS
LT1963 Minimum Input Voltage
3.0
2.5
2.0
1.5
1.0
0.5
0
–50 –25
I
L
= 100mA
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
MINIMUM INPUT VOLTAGE (V)
LOAD REGULATION (mV)
I
L
= 1.5A
I
L
= 500mA
50
25
75
0
TEMPERATURE (°C)
RMS Output Noise vs Load
Current (10Hz to 100kHz)
50
OUTPUT NOISE VOLTAGE (µV
RMS
)
45
40
35
30
25
20
15
10
5
0
0.0001
0.001
0.01
0.1
LOAD CURRENT (A)
1
10
1063 G36
C
OUT
= 10µF
LT1963-3.3
LT1963-2.5
LT1963-1.8
LT1963-1.5
LT1963
LT1963-3.3 Transient Response
200
OUTPUT VOLTAGE
DEVIATION (mV)
OUTPUT VOLTAGE
DEVIATION (mV)
V
IN
= 4.3V
150 C
IN
= 3.3µF TANTALUM
C
OUT
= 10µF TANTALUM
100
50
0
–50
–100
LOAD
CURRENT (A)
LOAD
CURRENT (A)
0.6
0.4
0.2
0
0
2
4
6
8
10 12 14 16 18 20
TIME (µs)
1963 G38
U W
100
125
1963 G33
Load Regulation
10
5
0
–5
–10
–15
LT1963-2.5
LT1963-3.3
V
IN
= V
OUT(NOMINAL)
+1V
(LT1963-1.5/-1.8/-2.5/-3.3)
V
IN
= 2.7V (LT1963)
∆I
L
= 1mA TO 1.5A
50
25
75
0
TEMPERATURE (°C)
100
125
LT1963-1.5
LT1963-1.8
LT1963
1.0
Output Noise Spectral Density
C
OUT
= 10µF
I
L
=1.5A
LT1963-3.3
LT1963-2.5
0.1
LT1963-1.8
LT1963
LT1963-1.5
– 20
–50 –25
0.01
10
100
1k
10k
FREQUENCY (Hz)
100k
1963 G35
1963 G34
LT1963-3.3 10Hz to 100kHz Output Noise
V
OUT
100µV/DIV
C
OUT
= 10µF
I
LOAD
= 1.5A
1ms/DIV
1963 G37
LT1963-3.3 Transient Response
150
100
50
0
–50
–100
–150
1.5
1.0
0.5
0
0
50 100 150 200 250 300 350 400 450 500
TIME (µs)
1963 G39
V
IN
= 4.3V
C
IN
= 33µF TANTALUM
C
OUT
= 100µF TANTALUM
+10
×
1µF CERAMIC
1963fc
9
LINER [ LINEAR TECHNOLOGY ]
