L4902A

Voltage - Output (Min/Fixed):	5V
Base Part Number:	L4902A
Supplier Device Package:	7-HEPTAWATT
Package / Case:	Heptawatt-7 (Vertical, Bent and Staggered Leads)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 150°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	--
Current - Output:	300mA
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	24V
Voltage - Input (Min):	--
Number of Outputs:	2
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tube

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IntroductionThe L4902A is a relatively new and advanced DC-DC switching regulator from STMicroelectronics. It is specifically designed for low-power applications, such as battery-operated or embedded systems. This article will discuss the L4902A’s features and usage scenarios, as well as a brief explanation of its working principle.Application FieldThe L4902A DC-DC switching regulator is ideal for providing low-power voltage conversions in battery-powered systems a total output power of 1.2 W. It offers a wide input voltage range of 2.6 V to 8.5 V and a variable output voltage range of 0.6 V to 5.5 V. The regulator features variable output current capability at up to 25 mA. A low-resistance FLYBACK architecture is used, with low switching and control frequencies, making the L4902A suitable for those applications where noise or EMI are an issue. Thanks to its small size, the L4902A can be naturally integrated into small systems. The device is available in two packages, HVSON-8 and USP-6, both having a small footprint of 4.5 mm X 4.5 mm. This makes the product ideal for embedded, portable, or handheld applications. The L4902A is designed for low-power operation and it is highly efficient. It also supports input voltages that can rise up to 8.5 V (typ.), making the L4902A a great choice for powering devices such as motor control circuits or LED displays. This feature makes the L4902A a good fit for battery-operated consumer applications such as medical devices, wearable technologies, portable media players and many others. Working PrincipleThe L4902A DC-DC Switching Regulators use a buck-boost topology, which is a combination of a buck and a boost regulator. The L4902A works by switching the high-side power FET in order to allow energy storage and release in an inductor as output voltage is generated. In this way, energy is transferred between the two ends of the inductor in the form of a sawtooth waveform.The L4902A works by first monitoring the output voltage and adjusting the switching of the high-side power FET to maintain the output voltage within the desired range. In this way, the output voltage of the system is regulated. The L4902A also works by providing a feedback voltage, which is used to control the switching of the high-side power FET in order to maintain the output voltage. This feedback voltage is generated by a linear regulator, which in turn is powered by the output voltage. The L4902A is also capable of generating an adjustable soft-start time period, providing maximum protection of the system. ConclusionIn conclusion, the L4902A DC-DC Switching Regulators from STMicroelectronics are a great choice for those applications that require a low-power voltage conversion. Its features include a low-resistance FLYBACK architecture, adjustable output current capability, small size, a wide input voltage range and adjustable soft-start time period, making the L4902A ideal for a variety of portable, embedded and consumer applications. Furthermore, its functionality and operation is quite simple, thanks to its buck-boost topology with an integrated linear regulator for feedback voltage control.

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