ELM631FA Synchronous Step-Up/Step-Down 4-Switch DC/DC Converter
The ELM631FA is a synchronous buck-boost converter that incorporates four switch transistors. It can continuously boost and buck over a wide range of input and output voltages. With peak current mode and fixed off-time control, it enables smooth voltage control in all modes: boost, buck-boost, and buck. It employs a current detection method based on the DC resistance of the coil, allowing for high-efficiency control without current sensing resistors. An external phase compensation circuit enables stable control under a wide range of operating conditions. It includes built-in features such as a soft-start circuit, maximum switch current limit, input voltage drop detection, overvoltage output detection, overload-output short protection, and overheat protection. The rich built-in features facilitate power system configuration, reduce the need for external components, and allow for a smaller footprint. The ELM631FA uses a 28-pin QFN package measuring 5mm x 5mm.
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basic information
Features • Coil DC resistance current detection method • Configurable input current limit • EN function • Power Good (PG) output • Current limit per switch cycle • Intermittent operation mode short-circuit protection • Input voltage range: 3.1V to 28.0V • Output voltage range: 1.0V to 28.0V • Switch transistors: 17mΩ/20A N-channel MOSFETs x 4 • Output current: 5A (input voltage 4.5V to 20V) 6A (input voltage 20V or higher) • Maximum efficiency: 97.5% • Switching frequency: 600kHz • Overheat protection: 155℃ • Package: QFN28-5x5
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Applications/Examples of results
Application examples USB Type-C hub For power supply of 5V, 9V, 12V, 20V, 24V USB-PD, USB Power Delivery system Electronic cigarettes Accessories for tablet PCs For battery-powered mobile system power supply Absolute maximum ratings
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Company information
In the IT devices where miniaturization and lightweight design have become standard, analog semiconductors are essential for realizing digital systems. Elm Technology has responded to various market needs with its compact and high-quality ICs under its own brand. Elm Technology operates from its headquarters in Tokyo, the Okinawa Technology Center, Elm High Tech (partner in Taiwan), and ELM Korea (local subsidiary), engaging in the design, development, and sales of ICs for AV equipment, PC peripherals, and various other applications. Additionally, we also develop custom ICs. 【Products Offered】 Logic ICs, operational amplifiers, voltage detectors, light sensors, high-speed logic ICs, DC-DC converters, voltage regulators, SPI flash memory, voltage comparators, DC-DC converter modules, special functions (LED drivers, laser diode drivers, IF detection ICs), bipolar transistors, MOSFETs (single power MOSFETs, dual power MOSFETs, complementary power MOSFETs).