LT1761 Series
TYPICAL PERFOR A CE CHARACTERISTICS
LT1761-5
Input Ripple Rejection
80
70
RIPPLE REJECTION (dB)
C
BYP
= 0.01µF
C
BYP
= 1000pF
RIPPLE REJECTION (dB)
MINIMUM INPUT VOLTAGE (V)
60
50
40
30
20
10
0
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
1761 G36
C
BYP
= 100pF
I
L
= 100mA
V
IN
= V
OUT(NOMINAL)
+
1V + 50mV
RMS
RIPPLE
C
OUT
= 10µF
Load Regulation
∆I
L
= 1mA to 50mA
0
–5
LT1761-BYP, -SD
LT1761-1.5
LT1761-1.8
LT1761-2
LT1761-2.5
LT1761-2.8
LT1761-3
LT1761-3.3
0
–10
LOAD REGULATION (mV)
LOAD REGULATION (mV)
–10
–15
–20
–25
– 30
–35
–40
–50 –25
0
25
50
75
100
TEMPERATURE (°C)
1761 G39
Output Noise Spectral Density
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
10
LT1761-3.3
LT1761-2.8,-3
LT1761-2.5
LT1761-5
1
LT1761-BYP, -SD
0.1
C
OUT
= 10µF
C
BYP
= 0
I
L
= 100mA
0.01
10
100
1k
10k
FREQUENCY (Hz)
100k
1761 G41
OUTPUT NOISE (µV
RMS
)
LT1761-1.5
LT1761-1.8
LT1761-2
10
U W
Input Ripple Rejection
80
70
2.0
60
50
40
30
20
10
V
IN
= V
OUT (NOMINAL)
+
1V + 0.5V
P-P
RIPPLE
AT f = 120Hz
I
L
= 50mA
0
25
50
75
100
125
2.5
LT1761-BYP, LT1761-SD
Minimum Input Voltage
I
L
= 100mA
1.5
I
L
= 50mA
1.0
0.5
0
–50 –25
0
–50 –25
TEMPERATURE (°C)
1761 G37
50
0
75
25
TEMPERATURE (°C)
100
125
1761 G38
Load Regulation
∆I
L
= 1mA to 100mA
LT1761-BYP, -SD
LT1761-1.5
LT1761-1.8
LT1761-2
LT1761-2.5
LT1761-2.8
LT1761-3
LT1761-3.3
–20
–30
–40
–50
–60
–70
–80
–90
LT1761-5
LT1761-5
125
–100
–50 –25
0
25
50
75
100
125
TEMPERATURE (°C)
1761 G40
Output Noise Spectral Density
10
RMS Output Noise vs
Bypass Capacitor
140
LT1761-5
120
LT1761-3.3
LT1761-3
LT1761-2.8
LT1761-2.5
C
OUT
= 10µF
I
L
= 100mA
f = 10Hz TO 100kHz
LT1761-5
1
C
BYP
= 1000pF
C
BYP
= 100pF
100
80
60
40
LT1761-BYP
0.1
C
BYP
= 0.01µF
C
OUT
= 10µF
I
L
= 100mA
0.01
10
100
1k
10k
FREQUENCY (Hz)
100k
1761 G42
LT1761-1.8, -2
20
0
10
100
C
BYP
(pF)
1761 G43
LT1761-1.5
LT1761-BYP
1k
10k
LINER [ LINEAR TECHNOLOGY ]
