Fairchild KA278RXXC-Series Data Handbook
Summary
The KA278RXXC series offers comprehensive low-dropout voltage regulators designed for high-reliability power conversion in various electronic equipment. This robust regulator provides up to 2A output and multiple fixed voltages (3.3V, 5V, 9V, 12V). The manual serves as a detailed technical resource for engineers, covering key features including overcurrent protection, thermal shutdown, adjustable outputs, and precise operational specifications. Ideal for designers who require stable, efficient voltage regulation in compact to TO-220 packaged designs.
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KA278RXXC-Series 2A Output Low Dropout Voltage Regulators
Features Description
The KA278RXXC is a low-dropout voltage regulator suit-
KA278RXXC-series (33/05/51/09/12)
able for various electronic equipments. It provides
2A/3.3V, 5V, 5.1V, 9V, 12V output low dropout voltage
constant voltage power source with TO-220-4 lead full mold
regulator
package. The dropout voltage of KA278RXXC is below
TO-220 full-mold package (4pin)
0.5V in full rated current(2A). This regulator has various
Overcurrent protection, thermal shutdown
functions such as a peak current protection, a thermal shut
Overvoltage protection, short circuit protection
down, an overvoltage protection .
With output disable function
TO-220F-4L
KA278RA05C Nominal 5V output without adjusting Output adjustable between 1.25V and 32V 2A output low dropout voltage regulator TO-220 full-mold package (4pin) Overcurrent protection, thermal shutdown
1.Vin 2. Vo 3. GND 4. Vdis - KA278RXXC(33/05/51/09/12)
Overvoltage protection, short circuit protection
1.Vin 2. Vo 3. GND 4. Vadj - KA278RA05C
Internal Block Diagram
2Vin Vo 2Vin Vo
OVERVOLTAGE OVERVOLTAGE
THERMAL SHUTDOWN PROTECTION THERMAL SHUTDOWN
PROTECTION
BANDGAP REFERENCE BANDGAP REFERENCE
SOA PROTECTION
SOA PROTECTION
HIGH / LOW OUTPUT
ON / OFF
1.4V SHORTCIRCUIT
PROTECTION SHORTCIRCUIT
PROTECTION Rref
GND GND
(KA278RA05C)(KA278R33/05/51/09/12C)
Rev. 1.0.2
©2005 Fairchild Semiconductor Corporation
Page Summary Contents For Fairchild KA278RXXC-Series Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 20 |
| File Size | 208.86 KB |
| Published | July 22, 2026 |
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Frequently Asked Questions
What is the maximum input voltage (Vin) for the KE278RXXC series regulator?
The absolute maximum rating lists the Input Voltage (Vin) as 35 V.
How does the KA278RA05C adjust its output voltage?
The RA05C provides an adjustable output voltage range between 1.25V and 32V using a Vadj pin.
What protections are included in this series of regulators?
Features include overcurrent protection, thermal shutdown, short circuit protection, and overvoltage protection.
What is the typical power dissipation (Pd) with a heatsink?
With a heatsink, the maximum power dissipation (Pd2) is 15 W.