LD1117V50 datasheet(1/38 Pages) STMICROELECTRONICS | LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS

Part #	LD1117V50

Description	LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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December 2006

Rev. 20

1/38

38

LD1117 series

Low drop fixed and adjustable positive voltage regulators

Feature summary

■ Low dropout voltage (1V TYP.)

■ 2.85V Device performances are suitable for

SCSI-2 active termination

■ Output current up to 800 mA

■ Fixed output voltage of: 1.2V, 1.8V, 2.5V,

2.85V, 3.0V, 3.3V, 5.0V

■ Adjustable version availability (Vrel=1.25V)

■ Internal current and thermal limit

■ Available in ± 1% (at 25°C) and 2% in full

temperature range

■ 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 and TO-220.

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 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.

DPAK

SO-8

TO-220

SOT-223

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Block diagram

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