Datasheet

LT1761 Series
12
1761sff
TYPICAL PERFORMANCE CHARACTERISTICS
Load Regulation
ΔI
L
= 1mA to 50mA
Load Regulation
ΔI
L
= 1mA to 100mA
Output Noise Spectral Density Output Noise Spectral Density
RMS Output Noise vs
Bypass Capacitor
LT1761-5
Input Ripple Rejection Input Ripple Rejection
LT1761-BYP, LT1761-SD
Minimum Input Voltage
FREQUENCY (Hz)
RIPPLE REJECTION (dB)
80
70
60
50
40
30
20
10
0
10 1k 10k 1M
1761 G36
100 100k
I
L
= 100mA
V
IN
= V
OUT(NOMINAL)
+
1V + 50mV
RMS
RIPPLE
C
OUT
= 10μF
C
BYP
= 0.01μF
C
BYP
= 100pF
C
BYP
= 1000pF
TEMPERATURE (°C)
–50
RIPPLE REJECTION (dB)
100
1761 G37
050
80
70
60
50
40
30
20
10
0
–25 25 75 125
V
IN
= V
OUT (NOMINAL)
+
1V + 0.5V
P-P
RIPPLE
AT f = 120Hz
I
L
= 50mA
TEMPERATURE (°C)
–50
MINIMUM INPUT VOLTAGE (V)
2.5
2.0
1.5
1.0
0.5
0
0
50
75
1761 G38
–25
25
100
125
I
L
= 100mA
I
L
= 50mA
TEMPERATURE (°C)
–50
LOAD REGULATION (mV)
100
1761 G39
050
0
–5
–10
–15
–20
–25
–30
–35
–40
–25 25 75 125
LT1761-BYP, -SD, -1.2
LT1761-1.8
LT1761-1.5
LT1761-2
LT1761-2.5
LT1761-2.8
LT1761-3
LT1761-3.3
LT1761-5
TEMPERATURE (°C)
–50
LOAD REGULATION (mV)
100
1761 G40
050
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–25 25 75 125
LT1761-3
LT1761-2
LT1761-2.5
LT1761-2.8
LT1761-5
LT1761-3.3
LT1761-BYP, -SD, -1.2
LT1761-1.8
LT1761-1.5
FREQUENCY (Hz)
10 1k 10k 100k
1761 G41
100
10
1
0.1
0.01
OUTPUT NOISE SPECTRAL DENSITY (μV/√Hz)
C
OUT
= 10μF
C
BYP
= 0
I
L
= 100mA
LT1761-BYP,
-SD, 1.2
LT1761-5
LT1761-3.3
LT1761-2.8,-3
LT1761-2.5
LT1761-1.8
LT1761-2
LT1761-1.5
FREQUENCY (Hz)
10 1k 10k 100k
1761 G42
100
10
1
0.1
0.01
OUTPUT NOISE SPECTRAL DENSITY (μV/√Hz)
LT1761-BYP
LT1761-5
C
BYP
= 1000pF
C
BYP
= 0.01μF
C
BYP
= 100pF
C
OUT
= 10μF
I
L
= 100mA
C
BYP
(pF)
10
OUTPUT NOISE (μV
RMS
)
140
120
100
80
60
40
20
0
100 1k 10k
1761 G43
C
OUT
= 10μF
I
L
= 100mA
f = 10Hz TO 100kHz
LT1761-5
LT1761-3.3
LT1761-3
LT1761-2.8
LT1761-2.5
LT1761-1.5
LT1761-1.8, -2
LT1761-BYP, -1.2