L5985

Voltage - Output (Min/Fixed):	0.6V
Base Part Number:	L5985
Supplier Device Package:	8-VFQFPN (3x3)
Package / Case:	8-VFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 150°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	250kHz ~ 1MHz
Current - Output:	2A
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 L5985 is a high efficiency, low voltage (LV) monolithic DC/DC synchronous, step-down switching regulator. With its switching of current levels in the conversion process, it is able to provide greater output current and power conversion ratios than linear devices, while providing additional protection, such as overtemperature, under-voltage and over-current, on-board. The efficiency of the converter can be improved with the use of low resistance power switches and synchronous rectification, thanks to its dual-channel output capabilities and integrated, independent current sense amplifier.

Application Field

The L5985 can be applied in various scenarios including, but not limited to, consumer and professional electronics, telecom and industrial control, automotive and motor control, LED lighting, and battery-powered applications. It is particularly suitable for small- to medium-sized power converters, and can be used in both point-of-load (POL) and point-of-source (POS) designs. Its wide input voltage range makes it ideal for powering multiple downstream devices.

Features

The L5985 offers a range of features designed to optimize performance and reduce design complexity. It provides independent power supply control, easy synchronization between multiple voltage rails, low duty cycle operation, high efficiency at light load, and high-side MOSFET current sense. The device’s low quiescent current and low stand-by current allow for high efficiency when the device is not in use, while its integrated GND, PWROK and EN pins, as well as its ability to be run in DCM and CCM, make it easy to design a power management solution.

Working Principle

The L5985 uses a switched-mode power supply system to convert an input voltage to a lower output voltage. Internally, it is composed of a controller, several pass transistors, a feedback loop, an energy storage element (usually a choke network), and a few other components.At the start of the cycle, the control circuit activates the high-side MOSFET and turns on the input voltage. This initializes the pulse width modulated (PWM) control of the converter. The high-side MOSFET then alternates between the on and off states to switch the current levels of the input voltage. Current is delivered to the output by the inductor, while the current sense amplifier measures its levels and send feedback signals to the controller. These signals maintain the switching mechanism of current levels until the output voltage reaches its preset level. Once the output voltage reaches the desired level, the controller shuts off the high-side transistor and the cycle begins again.

Conclusion

The L5985 is a highly efficient DC/DC synchronous, step-down switching regulator that is ideal for powering both a single downstream device or an entire system of devices. Thanks to its integrated GND, PWROK and EN pins, and its ability to be used in both DCM and CCM, the L5985 simplifies the process of designing a reliable power management solution. Its switching of current levels in the conversion process makes it more power efficient than linear devices, while its low quiescent current and low stand-by current allow for higher efficiency when the device is not in use.

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