L4947PD

Current - Output:	500mA
Base Part Number:	L4947
Supplier Device Package:	PowerSO-20
Package / Case:	20-SOIC (0.433", 11.00mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Temperature, Reverse Polarity, Short Circuit
Control Features:	Reset
PSRR:	60dB (120Hz)
Current - Supply (Max):	180mA
Current - Quiescent (Iq):	13mA
Series:	--
Voltage Dropout (Max):	0.75V @ 500mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	5V
Voltage - Input (Max):	26V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tube

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The L4947PD is a linear voltage regulator IC that belongs to the family of power management integrated circuits (PMIC). It is used in systems that operate from a 3V to 20V supply voltage and provide an adjustable output of 1.0V to 19V with an output current of up to 1.4A. This device is designed for use in a wide range of applications, including power conversion, mobile processor and peripheral power, embedded control systems, automotive and industrial electronics, and many others. This monolithic IC features a high efficieny, low power linear voltage regulator. It is provided with a low dropout voltage and thermal shutdown protection. It includes on-chip protection diodes and other features, to ensure reliable operation in the event of electrical faults. The device also includes a POK (Power Ok) output with built-in hysteresis, which provides an early warning of reversed polarity or short circuit, and can be used to disable other devices connected in the circuit. The L4947PD is generally designed for use with an external Schottky diode for current limiting and protection. It also requires a minimum input-output differential voltage between 0.8V and 1.3V, in order to minimize the dropout voltage. The L4947PD can be used in a variety of different types of applications, such as power supplies for computers, industrial controllers, mobile phones and other portable devices, and other low voltage applications. The working principle behind the L4947PD is quite simple. The device consists of a voltage reference, an error amplifier, and a series pass transistor. The voltage reference is used to set the desired output voltage, while the error amplifier compares the reference voltage with the output voltage, and then adjusts the series pass transistor accordingly. This adjustment is done in a feedback loop, so that the load current is always kept constant, ensuring continuous output power supply. In summary, the L4947PD is a reliable, efficient, low power linear voltage regulator. It is suitable for use in a variety of applications, ranging from power supply for computers to portable devices. It has a high current limit and a low dropout voltage, ensuring constant and reliable operation. It includes various circuits that ensure safe operation in the event of faults, as well as a POK output for reversed polarity and short circuit protection. The device works according to a simple principle involving a voltage reference, an error amplifier, and a series pass transistor.

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