LT1117_1 Datasheet, PDF (5/16 Pages) Linear Technology – 800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V

TYPICAL PERFORMANCE CHARACTERISTICS
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
LT1117 Ripple Rejection
100
90
V_RIPPLE ≤ 3V_P-P
V_RIPPLE ≤
0.5V_P-P
80
70
(V_IN – V_OUT) ≥ 3V
60
50
40
(V_IN – V_OUT) ≥ V_DROPOUT
30
20 _{CADJ = 200μF AT f < 60Hz}
10 ^CADJ ^{= 25μF AT f > 60Hz}
0 ^{IOUT = 0.5A}
10
100
1k
10k
FREQUENCY (Hz)
100k
1117 G04
LT1117 Ripple Rejection
vs Current
100
V_OUT = 5V
90 C_ADJ = 25μF
80 ^{COUT = 25μF}
f_RIPPLE = 120Hz
70
V_RIPPLE ≤ 3V_P-P
60
50
f_RIPPLE = 20kHz
40
V_RIPPLE ≤ 0.5V_P-P
30
20
10
0
0
0.2
0.4
0.6
0.8
OUTPUT CURRENT (A)
1117 G05
Temperature Stability
2.0
1.0
0
–1.0
–2.0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
1117 G06
Adjust Pin Current
100
90
80
70
60
50
40
30
20
10
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1117 G07
LT1117-2.85
Load Transient Response
0.3
C_IN = 10μF
0.2 ^COUT ^{= 10μF TANTALUM}
V_IN = 4.25V
0.1 ^{PRELOAD = 0.1A}
0
–0.1
–0.2
0.5
0
–0.5
0 10 20 30 40 50 60 70 80 90 100
TIME (μs)
1117 G08
LT1117-5
Load Transient Response
0.3
C_IN = 10μF
0.2 ^COUT ^{= 10μF TANTALUM}
V_IN = 6.5V
0.1 ^{PRELOAD = 0.1A}
0
–0.1
–0.2
0.5
0
–0.5
0 10 20 30 40 50 60 70 80 90 100
TIME (μs)
1117 G09
LT1117-2.85
Line Transient Response
60
C_IN = 1μF
40 ^COUT ^{= 10μF TANTALUM}
I_OUT = 0.1A
20
0
–20
–40
5.25
4.25
3.25
0 20 40 60 80 100 120 140 160 180 200
TIME (μs)
1117 G10
LT1117-5
Line Transient Response
60
C_IN = 1μF
40
C_OUT = 10μF TANTALUM
I_OUT = 0.1A
20
0
–20
–40
7.50
6.50
5.50
0 20 40 60 80 100 120 140 160 180 200
TIME (μs)
1117 G11
1117fd
5