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LT1117-3.3 Datasheet

  • LT1117-3.3

  • 800mA Low Dropout Positive Regulators Adjustable and Fixed 2...

  • 283.67KB

  • 12頁

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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
s
s
s
s
s
s
s
DESCRIPTIO
Space Saving SOT-223 Surface Mount Package
Three-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V
Output Current of 800mA
Operates Down to 1V Dropout
Guaranteed Dropout Voltage at Multiple Current Levels
0.2% Line Regulation Max
0.4% Load Regulation Max
APPLICATI
s
s
s
s
s
S
Active SCSI Terminators
High Efficiency Linear Regulators
Post Regulators for Switching Supplies
Battery Chargers
5V to 3.3V Linear Regulators
The LT1117 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
鹵
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 10碌F 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 APPLICATI
Active Terminator for SCSI-2 Bus
1.4
Dropout Voltage (V
IN
鈥?V
OUT
)
110鈩?/div>
1.2
110鈩?/div>
DROPOUT VOLTAGE (V)
LT1117-2.85
IN
4.75V TO
5.25V
OUT
GND
10碌F
1.0
0.8
0.6
0.4
0.2
INDICATES GUARANTEED TEST POINT
0
0
100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
LT1117 鈥?TPC01
110鈩?/div>
18 TO 27
LINES
+
+
22碌F
110鈩?/div>
LT1117 鈥?TA01
U
T
J
= 25擄C
T
J
= 125擄C
UO
UO
1

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