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LT1117_02 Datasheet, PDF (4/12 Pages) Linear Technology – 800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V | |||
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LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
TYPICAL PERFOR A CE CHARACTERISTICS
LT1117 Ripple Rejection
100
90
VRIPPLE ⤠3VP-P
VRIPPLE â¤
0.5VP-P
80
70
(VIN â VOUT) ⥠3V
60
50
40
(VIN â VOUT) ⥠VDROPOUT
30
20 CADJ = 200µF AT f < 60Hz
10 CADJ = 25µF AT f > 60Hz
0 IOUT = 0.5A
10
100
1k
10k
100k
FREQUENCY (Hz)
LT1117 ⢠TPC05
LT1117 Ripple Rejection vs Current
100
VOUT = 5V
90 CADJ = 25µF
80 COUT = 25µF
fRIPPLE = 120Hz
70
VRIPPLE ⤠3VP-P
60
50
fRIPPLE = 20kHz
40
VRIPPLE ⤠0.5VP-P
30
20
10
0
0
0.2
0.4
0.6
0.8
OUTPUT CURRENT (A)
LT1117 ⢠TPC06
Temperature Stability
2.0
1.0
0
â1.0
â2.0
â50 â25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1117 ⢠TPC07
Adjust Pin Current
100
90
80
70
60
50
40
30
20
10
0
â50 â25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1117 ⢠TPC08
LT1117-2.85
Load Transient Response
0.3
CIN = 10µF
0.2 COUT = 10µF TANTALUM
VIN = 4.25V
0.1 PRELOAD = 0.1A
0
â 0.1
â 0.2
0.5
0
â 0.5
0 10 20 30 40 50 60 70 80 90 100
TIME (µs)
LT1117 ⢠TPC09
LT1117-5
Load Transient Response
0.3
CIN = 10µF
0.2 COUT = 10µF TANTALUM
VIN = 6.5V
0.1 PRELOAD = 0.1A
0
â 0.1
â 0.2
0.5
0
â 0.5
0 10 20 30 40 50 60 70 80 90 100
TIME (µs)
LT1117 ⢠TPC10
LT1117-2.8
Line Transient Response
60
CIN = 1µF
40 COUT = 10µF TANTALUM
IOUT = 0.1A
20
0
â20
â40
5.25
4.25
3.25
0 20 40 60 80 100 120 140 160 180 200
TIME (µs)
LT1117 ⢠TPC11
LT1117-5
Line Transient Response
60
CIN = 1µF
40
COUT = 10µF TANTALUM
IOUT = 0.1A
20
0
â20
â40
7.50
6.50
5.50
0 20 40 60 80 100 120 140 160 180 200
TIME (µs)
LT1117 ⢠TPC12
4
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