MC34268 Datasheet, PDF (1/8 Pages) ON Semiconductor – SCSI-2 Active Terminator Regulator

MC34268
SCSI-2 Active Terminator
Regulator
The MC34268 is a medium current, low dropout positive voltage
regulator specifically designed for use in SCSI–2 active termination
circuits. This device offers the circuit designer an economical
solution for precision voltage regulation, while keeping power losses
to a minimum. The regulator consists of a 1.0 V dropout composite
PNP/NPN pass transistor, current limiting, and thermal limiting.
These devices are packaged in the 8–pin SOP–8 and 3–pin DPAK
and SOT–223 surface mount power packages.
Applications include active SCSI–2 terminators and post
regulation of switching power supplies.
• 2.85 V Output Voltage for SCSI–2 Active Termination
• 1.0 V Dropout
• Output Current in Excess of 800 mA
• Thermal Protection
• Short Circuit Protection
• Output Trimmed to 1.4% Tolerance
• No Minimum Load Required
• Space Saving DPAK, SOT–223 and SOP–8 Surface Mount Power
Packages
Simplified Block Diagram
Input
Thermal
Limiting
Control
Circuit
Current
Limit
Output
Ground
http://onsemi.com
MARKING
DIAGRAMS
8
8
1
SOP–8
D SUFFIX
CASE 751
34268
ALYW
1
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
Gnd 1
2
Output
3
Input 4
8 NC
7
Output
6
5 NC
(Top View)
1
3
DPAK
DT SUFFIX
CASE 369A
34268
ALYWW
1
3
SOT–223
ST SUFFIX
CASE 318E
AYW
268ST
4
123
Pin 1. Ground
2. Output
3. Input
4. Output
(Top View)
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 3 of this data sheet.
© Semiconductor Components Industries, LLC, 2000
1
April, 2000 – Rev. 1
Publication Order Number:
MC34268/D