LD1117B データシートの表示（PDF） - STMicroelectronics

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LD1117B

LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS

STMicroelectronics 

LD1117A/B

®

SERIES

LOW DROP FIXED AND ADJUSTABLE

POSITIVE VOLTAGE REGULATORS

s LOW DROPOUT VOLTAGE

(1.15V TYP @ IOUT=1.2A, 25 oC)

s VERY LOW QUIESCENT CURRENT

(5mA TYP @ 25 oC)

s TYPE A: OUTPUT CURRENT UP TO 1000mA

s TYPE B: OUTPUT CURRENT UP TO 1200mA

s FIXED OUTPUT VOLTAGE OF: 1.8V, 2.5V,

2.85V, 3.3V, 5.0V

s ADJUSTABLE VERSION AVAILABILITY

(Vref=1.25V)

s INTERNAL CURRENT AND THERMAL LIMIT

s ONLY 10 µF FOR STABILITY

s AVAILABLE IN ± 2% (AT 25oC) AND 4% IN

FULL TEMPERATURE RANGE

s HIGH SUPPLY VOLTAGE REJECTION :

(80dB TYP)

s TEMPERATURE RANGE : 0oC TO 125oC

DESCRIPTION

The LD1117A and LD1117B are two LOW

DROP Voltage Regulator able to provide

respectively up to 1000mA and 1200mA of

Output Current, available even in adjustable

version (Vref=1.25V). Concerning fixed versions,

are offered the following Output Voltages: 1.8V,

2.5V, 2.85V, 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. The

BLOCK DIAGRAM

PRELIMINARY DATA

SOT-223

TO-252 (DPAK)

SOT-223 and DPAK surface mount packages

optimize the thermal characteristics even

offering a relevant space saving effect. High

efficency is assured by NPN 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. 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.

June 2000

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