Current - Output:	100mA
Base Part Number:	KA78L05
Supplier Device Package:	TO-92-3
Package / Case:	TO-226-3, TO-92-3 (TO-226AA) (Formed Leads)
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	--
PSRR:	80dB (120Hz)
Current - Quiescent (Iq):	5.5mA
Series:	--
Voltage Dropout (Max):	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	5V
Voltage - Input (Max):	30V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Box (TB)

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Introduction

KA78L05AAZTA is a 3-pin Negative Voltage Regulator in the Linear Voltage Regulators (PMIC - Voltage Regulators - Linear) family from STMicroelectronics. Equipped with an independent voltage feedback loop, plus active voltage limiting and thermal shutdown, the device is designed for use in applications where an efficient, low-cost power source is required providing a stable negative output voltage.

Features

KA78L05AAZTA’s key features include the following:

• Input Voltage Range - Up to 20V
• Maximum Average Output Current - 100mA
• Output Voltage Range - -2.85V to -8V programmable
• Thermal Shutdown and Active Current Limiting Circuit
• High Ripple Rejection, Low Output Noise and Fast Response Time
• Operating Temperature Range - -40°C to +125°C

Moreover, this 3-pin voltage regulator has a typical thermal resistance of 54 °C/W, while its maximum junction temperature can reach up to 150°C. It is an SMD device available in an 8-lead SOIC package, with Ld1.27mm, E2.9mm; and L4.4mm, E3.1mm tail length.

Applications

Due to its high output current capability of up to 100mA, KA78L05AAZTA is a suitable choice for various applications where a stable negative voltage is needed, such as automotive, consumer electronics, industrial, home appliances and medical.

Working Principle

Like other Linear Voltage Regulators, KA78L05AAZTA\'s working principle is based on the properties of the regulating element (in this case, a transistor) that produces a small output voltage variation when its input voltage is changed.A negative voltage regulator monitors the output voltage level, and compares it with a reference voltage; if the output voltage exceeds the reference voltage, the regulating element switches off (or "shuts down") until the output voltage falls below the reference voltage. In this manner, the output voltage of the regulator stays at a constant value, even if the input voltage varies.

Conclusion

KA78L05AAZTA is a simple, low-cost three-pin Negative Voltage Regulator from STMicroelectronics, with a range of useful features, including an independent voltage feedback loop, plus active voltage limiting and thermal shutdown. It is mainly designed for automotive, consumer electronics, industrial, home appliances and medical applications, and its working principle is based on the properties of the regulating element.

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