L4949E

Current - Output:	100mA
Base Part Number:	L4949
Supplier Device Package:	--
Package / Case:	8-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	Reset Output
PSRR:	--
Current - Supply (Max):	5mA
Current - Quiescent (Iq):	300µA
Series:	--
Voltage Dropout (Max):	0.5V @ 100mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	5V
Voltage - Input (Max):	28V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tube

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L4949E Application Field and Working PrincipleLinear voltage regulators are essential components in modern electronics and are used to provide a regulated output voltage from a higher unregulated input voltage. They provide a constant output voltage at whatever current it is being asked to deliver, within its specified ratings. The L4949E is a monolithic voltage regulator, with fixed output voltage that integrates several features, making it especially suitable for an automotive environment.The L4949E is manufactured by STMicroelectronics and is a monolithic integrated step-down voltage regulator intended for use in a wide variety of low-voltage applications such as automotive, consumer, industrial and medical applications. The device can source or sink up to 200 mA of output current, with an output voltage range from 2.5 V up to 5.5 V and has a typical dropout voltage of 160 mV. It has on-chip thermal and current limitation as well as short-circuit protection. The typical quiescent current for the device is 15 mA, with a maximum operating temperature of 125°C.The device is bidirectional, meaning it can be used to regulate either an input or output voltage. It has a low-side current limit point and a shut-off voltage, making it capable of safely handling a wide range of input voltages and current requirements. The device also has a shutdown feature, allowing it to be completely disabled when not in use.The L4949E uses a voltage-mode control method, by regulating the output voltage with a current-regulated constant-voltage (CRV) series regulator. The CRV series regulator maintains a constant output voltage and can be adjusted by changing the value of the external resistor connected to the input of the series regulator. The output voltage can be adjusted to the desired value by adding a resistor between the output and the regulator, and this resistor is used to set the feedback voltage.The L4949E offers a very low dropout voltage, making it suitable for use in low-voltage applications. This also means that it can be used with a minimum load current, as the quiescent current is small and the voltage regulator can still be operated at a low-duty cycle.The L4949E is specifically designed to operate in the automotive environment and is therefore continuously subjected to harsh conditions. It is tested to withstand reverse polarity protection, over voltage and over temperature protection, as well as full load and thermal shock protection.In conclusion, the L4949E is an ideal device for automotive applications due to its integrated features, wide range of output voltage and current ratings, low dropout voltage, and its protection features. It provides a stable and dependable voltage source for applications, giving designers a reliable power supply solution.

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