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LA5693MD-AH application field and working principle

The LA5693MD-AH (LA5693) is a highly efficient and low noise power management integrated circuit (PMIC) that combines a specialized set of features to provide a simpler, durable, and more reliable solution for a range of consumer, medical, and industrial applications. This PMIC has been specifically designed to optimize the usage of system components while drastically reducing power loss, supporting industry-leading wide input voltage ranges and multiple output configurations.

Overview

LA5693 is a highly efficient and low noise PMIC, specifically designed to optimize the usage of system components while drastically reducing power loss. It supports industry-leading wide input voltage ranges, multiple output configurations and can accommodate up to six different output rails. With its state-of-the-art PMOSFET structure, this PMIC ensures an extremely high power stage efficiency and maximum power savings. Its advanced overvoltage protection ratings and its interleaved switching topology minimize EMI radiation and thermal stress.

LA5693 also provides a high level of integration, thus reducing system size and cost, and provides a comprehensive range of output and protection options for both the high and low regulation modes. Its thermal foldback protection greatly reduces high thermal stress in extreme operating conditions and it optimizes thermal management solutions.

Features

LA5693 offers an excellent combination of features that provide a high level of integration and low power loss:

• Wide input voltage range, up to 28V
• High efficiency, up to 96%
• Optimized peak current, up to 0.25 Amp
• 6 output rails (Vin, Vin + 5V/3V, VoutA, VoutB, VOUTD, VOUTE)
• Integrated synchronous buck regulator with high current output
• Integrated DC/DC Buck-Boost converter
• Low-power mode, down to 2uA
• Flexible power-down mode
• Advanced protections: overvoltage, overcurrent, thermal foldback, over temperature and more

Applications

LA5693 is an ideal solution for cost-sensitive applications requiring high efficiency and low power loss, such as consumer, medical, industrial, automotive, and IoT applications. Some of the applications include:

• Smartphones and handheld devices
• PCIe cards
• Tablets and 2-in-1 devices
• All-in-one PCs
• Set-top box and gaming consoles
• Medical and test equipment
• Industrial and automotive applications
• LED illumination applications
• TFT-LCD backlighting
• Wireless router, PLC, HVAC
• Internet of Things (IoT) applications
• Wearable devices

Working Principle

LA5693 integrates multiple power components into one monolithic switch chip, including two P-Channel MOSFETs, two N-Channel MOSFETs, two power converters, one low dropout linear regulator, and a comprehensive set of protection features. The device regulates the input voltage to an appropriate value by providing power supply sequencing and overvoltage protection.

The integrated MOSFETs deliver a very low on-resistance and high efficiency, helping to reduce power consumption, Thermal Design Power (TDP), and system size. The two power converters, buck and buck-boost, can be used to provide multiple output levels for different rails and also enable an efficient load sharing and balanced load pooling.

The advanced power management features include overvoltage and overcurrent protections, as well as thermal foldback protection which reduces the current level and the switching frequency when the device is under high temperature conditions. Moreover, the device also features a low-power standby mode, and a flexible power-down mode when the system is in idle or sleep mode.

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