LT1117CST-3.3-TRPBF datasheet, PDF

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LT1117CST-3.3-TRPBF: Description800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V; File Size181KB，16 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LT1117CST-3.3-TRPBF Overview

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

800mA Low Dropout

Positive Regulators Adjustable

and Fixed 2.85V, 3.3V, 5V

FEATURES

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.

Space Saving SOT-223 Surface Mount Package

3-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

APPLICATIONS

Active SCSI Terminators

High Efﬁciency Linear Regulators

Post Regulators for Switching Supplies

Battery Chargers

5V to 3.3V Linear Regulators

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.

TYPICAL APPLICATION

Active Terminator for SCSI-2 Bus

1.4

110Ω

LT1117-2.85

4.75V TO

5.25V

OUT

GND

10μF

DROPOUT VOLTAGE (V)

110Ω

18 TO 27

LINES

1.2

1.0

= 25°C

0.8

0.6

0.4

0.2

INDICATES GUARANTEED TEST POINT

100 200 300 400 500 600 700 800

OUTPUT CURRENT (mA)

1117 TA02

Dropout Voltage (V

– V

OUT

)

–40°C ≤ T

< 0°C

0°C ≤ T

≤ 125°C

22μF

= 125°C

110Ω

1117 TA01

1117fd

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