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PDF LT1117-3.3 Data sheet ( Hoja de datos )
| Número de pieza | LT1117-3.3 | |
| Descripción | positive low dropout regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT1117-3.3 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
800mA Low Dropout
Positive Regulators Adjustable
and Fixed 2.85V, 3.3V, 5V
FEATURES
n Space Saving SOT-223 Surface Mount Package
n 3-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V
n Output Current of 800mA
n Operates Down to 1V Dropout
n Guaranteed Dropout Voltage at Multiple Current Levels
n 0.2% Line Regulation Max
n 0.4% Load Regulation Max
APPLICATIONS
n Active SCSI Terminators
n High Efficiency Linear Regulators
n Post Regulators for Switching Supplies
n Battery Chargers
n 5V to 3.3V Linear Regulators
L, LT, LTC, LTM, Linear Technology, OPTI-LOOP and the Linear logo are registered trademarks
of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation. All
other trademarks are the property of their respective owners.
DESCRIPTION
The LT®1117 is a positive low dropout regulator designed
to provide up to 800mA of output current. The device is
available in an adjustable version and fixed output voltages
of 2.85V, 3.3V and 5V. The 2.85V version is designed
specifically to be used in Active Terminators for the SCSI
bus. All internal circuitry is designed to operate down to 1V
input to output differential. Dropout voltage is guaranteed
at a maximum of 1.2V at 800mA, decreasing at lower load
currents. On chip trimming adjusts the reference/output
voltage to within ± 1%. Current limit is also trimmed in
order to minimize the stress on both the regulator and the
power source circuitry under overload conditions.
The low profile surface mount SOT-223 package allows the
device to be used in applications where space is limited. The
LT1117 requires a minimum of 10μF of output capacitance
for stability. Output capacitors of this size or larger are
normally included in most regulator designs.
Unlike PNP type regulators where up to 10% of the output
current is wasted as quiescent current, the quiescent current
of the LT1117 flows into the load, increasing efficiency.
TYPICAL APPLICATION
Active Terminator for SCSI-2 Bus
4.75V TO
5.25V
LT1117-2.85
IN OUT
+ GND
10μF
+
22μF
110Ω
110Ω
110Ω
110Ω
18 TO 27
LINES
1117 TA01
Dropout Voltage (VIN – VOUT)
1.4
–40°C ≤ TJ < 0°C
1.2
0°C ≤ TJ ≤ 125°C
1.0
TJ = 25°C
0.8
TJ = 125°C
0.6
0.4
0.2
0
0
INDICATES GUARANTEED TEST POINT
100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
1117 TA02
1117fd
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
LT1117 Ripple Rejection
100
90
VRIPPLE ≤ 3VP-P
VRIPPLE ≤
0.5VP-P
80
70 (VIN – VOUT) ≥ 3V
60
50
40 (VIN – VOUT) ≥ VDROPOUT
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
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)
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
CIN = 10μF
0.2 COUT = 10μF TANTALUM
VIN = 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
CIN = 10μF
0.2 COUT = 10μF TANTALUM
VIN = 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
CIN = 1μF
40 COUT = 10μF TANTALUM
IOUT = 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
CIN = 1μF
40 COUT = 10μF TANTALUM
IOUT = 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
5 Page 
TYPICAL APPLICATIONS
Battery Charger
LT1117
IF
VIN IN
OUT
1.25V
RS
VOUT
ADJ R1
( )VOUT – 1.25V 1 + RR—21
( )IF =
–RS 1 + RR—21
( )ΔIF =
1
ΔVOUT –RS 1 + RR—21
1117 TA08
Improving Ripple Rejection
VIN +
10μF
LT1117
IN OUT
ADJ
R2
* C1 IMPROVES RIPPLE
REJECTION. XC SHOULD BE
365Ω
1%
≈ R1 AT RIPPLE FREQUENCY
R1
121Ω
1%
+
+
C1
10μF
5V
150μF
1117 TA10
LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
Battery Backed Up Regulated Supply
LT1117-5
VIN
IN OUT
+ GND
10μF
50Ω
5.2V LINE
5.0V BATTERY
SELECT FOR
CHARGE RATE
+
6.5V 10μF
LT1117-5
IN OUT
GND
+
100μF
1117 TA09
+
10μF
Automatic Light Control
LT1117
IN OUT
ADJ
1.2k
+
100μF
1117 TA11
High Efficiency Dual Supply
FEEDBACK PATH
MUR410
+
3.3V OUTPUT (TYPICAL)
470μF
+VIN
SWITCHING
REGULATOR
MUR410
+
LT1117-5
IN OUT
GND
470μF
+
10μF
+5V
0.5A
1N4002
MUR410
+
LT1117-5
IN OUT
GND
470μF
+
10μF
1N4002
–5V
0.5A
1117 TA12
1117fd
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1117-3.3.PDF ] | |
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