L5987

Voltage - Output (Min/Fixed):	0.6V
Base Part Number:	L5987
Supplier Device Package:	8-VFQFPN (3x3)
Package / Case:	8-VFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 150°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	250kHz ~ 1MHz
Current - Output:	3A
Voltage - Output (Max):	18V
Series:	--
Voltage - Input (Max):	18V
Voltage - Input (Min):	2.9V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Discontinued at Digi-Key
Packaging:	Tube

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Introduction

The L5987 is a DC-DC switching regulator developed by STMicroelectronics, a semiconductor company. It is a highly efficient, wide input voltage range, high-current step-down DC-DC switching regulator. It is primarily designed for automotive and industrial applications.Application Field

The L5987 switching regulator is suitable for high current automotive and industrial markets. It is an ideal approach for applications such as powertrain, battery management, railway, and healthcare. Furthermore, it is well suited for industrial applications such as off-grid power systems, connected home, solar powered chargers, smart home systems, and connected Industrial / IOT devices.Features

The L5987 DC-DC switching regulator has various features to increase efficiency and reliability. It has an adjustable output voltage ranging from 0 V to 5.6 V, which supports the wide input voltage range from 4.75 V to 60 V. Additionally, the device provides a 3A continuous output current with peak load current up to 5A.The L5987 also incorporates integrated under voltage lockout (UVLO) and enable/soft-rest. Other features of the device include overvoltage protection, current limitation/protection, and temperature shutdown.Working Principle

The L5987 works by switching the voltage at the output pin. This is done by employing integrated pulse-width-modulated (PWM) switching architecture. PWM is a technique by which the average voltage at the output can be controlled by modulating the width of the pulses applied at the switching frequency. When the device is supplied with the required input voltage, it is enabled by applying a logic ‘high\' voltage to the enable pin. The internal Pulse Width Modulation (PWM) controller works to generate an optimal pulsed signal with an adjustable switching frequency. This PWM signal is used to drive the internal power MOSFET switch, which controls the output voltage by switching on and off periodically at the specified frequency. The output voltage is regulated by adjusting the duty cycle of the PWM signal.Conclusion

The L5987 is a highly efficient, wide input voltage range, high-current step-down switching regulator. It is mainly used for automotive and industrial applications, and is suitable for high current markets such as powertrain, battery management, railway, and healthcare. Its features and working principle make it an excellent choice for such applications.

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