AP78L05/08/12
AP78LXX SERIES 3-TERMINAL POSITIVE REGULATORS
Description Pin Assignments
The AP78LXX Series is a three terminal positive regulator
(Bottom View)
available with fixed output voltages from 5V, 8V and 12V,
V V
GND IN
making them useful in a wide range of applications. When OUT
used as a Zener diode/resistor combination replacement, the
AP78LXX can improve output impedance by two orders of
magnitude, and lower quiescent current. These regulators
can provide local on card regulation, eliminating the
distribution problems associated with single point regulation.
The voltages available allow the AP78LXX's to be used in
TO92
logic systems. Instrumentation, HiFi and other solid state
electronic equipment.
(Top View)
The AP78LXX is available in the plastic TO92, SOT89 and
V 1 8 V
OUT IN
SO-8 using industrial standard package technology. The
regulator can deliver 100mA output current with adequate
GND 2 7 GND
heat sinking. Current limiting is included to limit the peak
GND 3 6 GND
output current to a safe value. Safe area protection for the
output transistors is provided to limit internal power
NC 4 5 NC
dissipation. Thermal overload protection is integrated to
prevent the IC from overheat due to abnormal condition.
SO-8
(Top View)
Features
Output voltages of 5.0V, 8.0V, 12V
Output voltage tolerances of 5% over the operating
temperature ranges
Output current in excess of 100mA
12 3
Internal thermal overload protection
V V
GND IN
OUT
Output transistor safe area protection
Internal short circuit current limiting
SOT89
No external components
Available in plastic TO92, SOT89 and plastic SO-8 low
Applications
profile packages
Lead Free Package: TO92 (Note 1)
Communication
SO-8 and SOT89: Available in Green Molding
CD-ROM
Compound (No Br, Sb) (Note 2)
DVD-Player
Lead Free Finish / RoHS Compliant (Note 3)
Set-Top Box
Notes: 1. TO92 is available in Lead Free product only.
2. SO-8 and SOT89 are available in Green products only.
3. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2). All applicable RoHS exemptions applied.
1 of 16 March 2012
AP78L05/08/12
Diodes Incorporated
www.diodes.com
Document number: DS31054 Rev. 10 - 2
AP78L05/08/12
AP78LXX SERIES 3-TERMINAL POSITIVE REGULATORS
Typical Application Circuit
Fixed Output Regulator
IN
OUT
Input Output
AP78Lxx
C1 C2
GND
0.33F 0.1F
() Required if the regulator is located more than 3 from the power supply filter
() See Note 5 in the electrical characteristics table
Pin Descriptions
Pin Name Description
V Operating Voltage Input
IN
V Voltage Output Pin
OUT
GND Ground
NC No Connection
Functional Block Diagram
Introduction
The AP78LXX series is a three terminal device with fixed output voltages from 5V,8V and 12V. The AP78LXX fixed voltage
regulator series has built-in thermal overload protection which prevents the device from being damaged due to excessive
junction temperature. The regulator also contains internal short-circuit protection which limits the maximum output current, and
safe-area protection for the pass transistor which reduces the short-circuit current as the voltage across the pass transistor is
increased.
2 of 16 March 2012
AP78L05/08/12
Diodes Incorporated
www.diodes.com
Document number: DS31054 Rev. 10 - 2