Low Drop Fixed And Adjustable Positive Voltage Regulators LD1117S33TR

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.

Block diagram

diode rectifier circuit

bridge rectifier circuit

Low Drop Fixed And Adjustable Positive Voltage Regulators LD1117S33TR Images