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ManualsBrandsLINEAR TECHNOLOGY ManualsPMICsPMIC - LDO voltage regulator Positivbe, adjustable DFN 6 (2x3)
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LT3085
6
3085fb
TYPICAL PERFORMANCE CHARACTERISTICS
INPUT-TO-OUTPUT DIFFERENTIAL (V)
0
0
CONTROL PIN CURRENT (mA)
2
4
6
8
16
14
12
10
20
6
12 18 24
3085 G19
30 36
18
I
LOAD
= 1mA
I
LOAD
= 500mA
DEVICE IN
CURRENT LIMIT
LOAD CURRENT (A)
0 0.1 0.2
CONTROL PIN CURRENT (mA)
8
7
6
5
4
3
2
1
0
3085 G20
0.50.3 0.4
T
J
= –50°C
T
J
= 25°C
T
J
= 125°C
V
IN
= V
CONTROL
= 2V
V
IN
= V
OUT
= 1V
R
TEST
(Ω)
0
OUTPUT VOLTAGE (mV)
800
700
600
500
400
300
200
100
0
3085 G21
2k1k
V
IN
= 10V
SET PIN = 0V
V
IN
V
OUT
R
TEST
V
IN
= 20V
V
IN
= 5V
FREQUENCY (Hz)
0
RIPPLE REJECTION (dB)
40
100
10k 100k10010 1k 1M
3085 G22
20
60
80
30
90
10
50
70
V
IN
= V
CONTROL
= V
OUT (NOMINAL)
+2V
RIPPLE = 50mV
P–P
C
OUT
= 2.2μF CERAMIC
C
SET
= 0.1μF CERAMIC
I
LOAD
= 100mA
I
LOAD
= 500mA
FREQUENCY (Hz)
0
RIPPLE REJE
C
TI
O
N (dB)
40
100
10k 100k10010 1k 1
M
3085
G
23
20
60
80
30
90
10
50
70
V
IN
= V
OUT (NOMINAL)
+ 1V
V
CONTROL
= V
OUT (NOMINAL)
+2V
RIPPLE = 50mV
P–P
C
OUT
= 2.2μF CERAMIC
C
SET
= 0.1μF CERAMIC
I
LOAD
= 100mA
I
LOAD
= 500mA
FREQUENCY (Hz)
10
0
RIPPLE REJECTION (dB)
10
30
40
50
100
70
100 10k
3085 G24
20
80
90
60
1k 100k 1M
V
IN
= V
CONTROL
+2V
V
CONTROL
= V
OUT (NOMINAL)
+2V
RIPPLE = 50mV
P–P
C
OUT
= 2.2μF CERAMIC
C
SET
= 0.1μF CERAMIC
I
LOAD
= 100mA
I
LOAD
= 500mA
V
CONTROL
Pin Current
V
CONTROL
Pin Current
Residual Output Voltage with
Less Than Minimum Load
Ripple Rejection - Single Supply
Ripple Rejection - Dual Supply
- V
CONTROL
Pin
Ripple Rejection - Dual Supply
- IN Pin
FREQUENCY (Hz)
1
ERROR AMPLIFIER NOISE
SPECTRAL DENSITY (nV/√Hz)
REFERENCE CURRENT NOISE
SPECTRAL DENSITY (pA/ √Hz)
10k
10k 100k10010 1k
3085 G26
100
10
1k
0.1
1k
10
1.0
100
Noise Spectral Density
V
OUT
100μV/DIV
TIME 1ms/DIV
3085 G27
V
OUT
= 1V
R
SET
= 100k
C
SET
= O.1μF
C
OUT
= 10μF
I
LOAD
= 0.5A
Output Voltage Noise
FREQUENCY (Hz)
77
78
RIPPLE REJECTION (dB)
85
84
100 125 1500–50 –25 25 50 75
3085 G25
81
82
80
79
83
SINGLE SUPPLY OPERATION
V
IN
= V
OUT (NOMINAL)
+2V
RIPPLE = 50mV
P–P
, f = 120Hz
I
LOAD
= 0.1A
C
OUT
= 2.2μF, C
SET
= 0.1μF
Ripple Rejection (120Hz)