LT1117 LINER [Linear Technology], LT1117 Datasheet

LT1117

Manufacturer Part Number

LT1117

Description

800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V

Manufacturer

LINER [Linear Technology]

Datasheet

1.LT1117.pdf (12 pages)

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Download datasheet (284Kb)

FEATURE

TYPICAL

PPLICATI

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

Active SCSI Terminators

High Efficiency Linear Regulators

Post Regulators for Switching Supplies

Battery Chargers

5V to 3.3V Linear Regulators

4.75V TO

5.25V

Active Terminator for SCSI-2 Bus

PPLICATI

10 F

LT1117-2.85

GND

OUT

22 F

110

LT1117 • TA01

18 TO 27

LINES

Adjustable and Fixed 2.85V,

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

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 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.

ESCRIPTIO

1.4

1.2

1.0

0.8

0.6

0.4

0.2

800mA Low Dropout

Dropout Voltage (V

100

Positive Regulators

INDICATES GUARANTEED TEST POINT

1%. Current limit is also trimmed in

200 300

OUTPUT CURRENT (mA)

LT1117-3.3/LT1117-5

LT1117/LT1117-2.85

400

500

– V

= 25 C

= 125 C

600

LT1117 • TPC01

OUT

700

3.3V, 5V

)

800

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