LD1117S データシートの表示（PDF） - STMicroelectronics

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LD1117S

Low drop fixed and adjustable positive voltage regulators

STMicroelectronics 

LD1117

SERIES

LOW DROP FIXED AND ADJUSTABLE

POSITIVE VOLTAGE REGULATORS

s LOW DROPOUT VOLTAGE (1V TYP.)

s 2.85V DEVICE PERFORMANCES ARE

SUITABLE FOR SCSI-2 ACTIVE

TERMINATION

s OUTPUT CURRENT UP TO 800 mA

s FIXED OUTPUT VOLTAGE OF: 1.2V, 1.8V,

2.5V, 2.85V, 3.0V, 3.3V, 5.0V

s ADJUSTABLE VERSION AVAILABILITY

(Vrel=1.25V)

s INTERNAL CURRENT AND THERMAL LIMIT

s AVAILABLE IN ± 1% (AT 25°C) AND 2% IN

FULL TEMPERATURE RANGE

s SUPPLY VOLTAGE REJECTION: 75dB (TYP.)

DESCRIPTION

The LD1117 is a LOW DROP Voltage Regulator

able to provide up to 800mA of Output Current,

available even in adjustable version (Vref=1.25V).

Concerning fixed versions, are offered the

following Output Voltages: 1.2V,1.8V,2.5V,2.85V,

3.0V 3.3V and 5.0V. The 2.85V type is ideal for

SCSI-2 lines active termination. The device is

supplied in: SOT-223, DPAK, SO-8, TO-220 and

TO-220FM. The SOT-223 and DPAK surface

mount packages optimize the thermal

characteristics even offering a relevant space

saving effect. High efficiency is assured by NPN

Figure 1: Block Diagram

TO-220FM

TO-220

DPAK

SOT-223

SO-8

pass transistor. In fact in this case, unlike than

PNP one, the Quiescent Current flows mostly into

the load. Only a very common 10µF minimum

capacitor is needed for stability. On chip trimming

allows the regulator to reach a very tight output

voltage tolerance, within ± 1% at 25°C. The

ADJUSTABLE LD1117 is pin to pin compatible

with the other standard. Adjustable voltage

regulators maintaining the better performances in

terms of Drop and Tolerance.

October 2004

Rev. 16

1/28

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