LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
800mA Low Dropout
Positive Regulators Adjustable
and Fixed 2.85V, 3.3V, 5V
FEATURES DESCRIPTION
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Space Saving SOT-223 Surface Mount Package
The LT 1117 is a positive low dropout regulator designed
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3-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V
to provide up to 800mA of output current. The device is
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Output Current of 800mA
available in an adjustable version and fixed output voltages
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Operates Down to 1V Dropout
of 2.85V, 3.3V and 5V. The 2.85V version is designed
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Guaranteed Dropout Voltage at Multiple Current Levels
specifically to be used in Active Terminators for the SCSI
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0.2% Line Regulation Max
bus. All internal circuitry is designed to operate down to 1V
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0.4% Load Regulation Max
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
APPLICATIONS
voltage to within 1%. Current limit is also trimmed in
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order to minimize the stress on both the regulator and the
Active SCSI Terminators
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power source circuitry under overload conditions.
High Ef ciency Linear Regulators
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Post Regulators for Switching Supplies
The low pro le surface mount SOT-223 package allows the
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Battery Chargers
device to be used in applications where space is limited. The
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5V to 3.3V Linear Regulators
LT1117 requires a minimum of 10F of output capacitance
L, LT, LTC, LTM, Linear Technology, OPTI-LOOP and the Linear logo are registered trademarks
for stability. Output capacitors of this size or larger are
of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation. All
other trademarks are the property of their respective owners.
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 ows into the load, increasing ef ciency.
TYPICAL APPLICATION
Active Terminator for SCSI-2 Bus Dropout Voltage (V V )
IN OUT
1.4
40C T < 0C
110
J
1.2
110
0C T 125C
J
LT1117-2.85 1.0
110
18 TO 27
T = 25C
J
IN OUT
LINES
0.8
GND
T = 125C
J
+ +
4.75V TO
110
10F 22F 0.6
5.25V
0.4
1117 TA01
0.2
INDICATES GUARANTEED TEST POINT
0
0 100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
1117 TA02
1117fd
1
DROPOUT VOLTAGE (V)LT1117/LT1117-2.85
LT1117-3.3/LT1117-5
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage Operating JunctionTemperature Range
Operating Voltage C Grade .................................................. 0C to 125C
LT1117, LT1117-3.3, LT1117-5 .........................15V I Grade ...............................................40C to 125C
LT1117-2.85 .....................................................10V Storage Temperature Range ...................65C to 150C
Surge Voltage Lead Temperature ....................(See Soldering Methods)
LT1117, LT1117-3.3, LT1117-5 .........................20V
PIN CONFIGURATION
FRONT VIEW
FRONT VIEW
3 IN
3 IN
TAB IS
TAB IS
2 OUT
2 OUT
V
OUT
V
OUT
1 ADJ/GND
1 ADJ/GND
ST PACKAGE
M PACKAGE
3-LEAD PLASTIC SOT-223
3-LEAD PLASTIC DD-PAK
T = 125C, = 15C/W
JMAX JC
T = 125C, = 10C/W
JMAX JC
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1117CST#PBF LT1117CST#TRPBF 1117 3-Lead Plastic SOT-223 0C to 125C
LT1117IST#PBF LT1117IST#TRPBF 1117I 3-Lead Plastic SOT-223 40C to 125C
LT1117CST-2.85#PBF LT1117CST-2.85#TRPBF 11172 3-Lead Plastic SOT-223 0C to 125C
LT1117IST-2.85#PBF LT1117IST-2.85#TRPBF 1117I2 3-Lead Plastic SOT-223 40C to 125C
LT1117CST-3.3#PBF LT1117CST-3.3#TRPBF 11173 3-Lead Plastic SOT-223 0C to 125C
LT1117IST-3.3#PBF LT1117IST-3.3#TRPBF 1117I3 3-Lead Plastic SOT-223 40C to 125C
LT1117CST-5#PBF LT1117CST-5#TRPBF 11175 3-Lead Plastic SOT-223 0C to 125C
LT1117IST-5#PBF LT1117IST-5#TRPBF 1117I5 3-Lead Plastic SOT-223 40C to 125C
LT1117CM#PBF LT1117CM#TRPBF LT1117CM 3-Lead Plastic DD-PAK 0C to 125C
LT1117CM-2.85#PBF LT1117CM-2.85#TRPBF LT1117CM-2.85 3-Lead Plastic DD-PAK 0C to 125C
LT1117CM-3.3#PBF LT1117CM-3.3#TRPBF LT1117CM-3.3 3-Lead Plastic DD-PAK 0C to 125C
LT1117CM-5#PBF LT1117CM-5#TRPBF LT1117CM-5 3-Lead Plastic DD-PAK 0C to 125C
1117fd
2