Specifications

9.Circuit descriptions and List of abbreviations EN 45

DVP320

8 Electrical alignments

Not available

9 Circuit descriptions

Refer to Service Training SD5.42 MTK. 12NC: 3122 785 12820 for IC MT1379, MT1366, BA5954

.1 Regulator LD1117DT

.1.1 Features

• Low drop out voltage (1V Typ)

• 2.85V device performance are suitable for SCSI-2 active

• Output current up to 800 mA

• Fixed output voltage of 2.5V, 2.85V, 3.0V, 3.3V, 5.0V

• Adjustable version availability (V

ref=1.25V)

• Internal current and thermal

• Available in ± 1% (at 25

C) and 2% in full temperature range

• Supply voltage ejection: 75 dB (Typ)

• Temperature range: 0

C to 125

.1.2 Description

The LD1117DT33 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: 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 10mF 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.

.1.3 BLOCK DIAGRAM

.1.4 Absolute maximum ratings

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these

conditions is not implied. Over the above suggested Max Power Dissipation a Short Circuit could definitively damage the device.