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High-voltage linear regulators aim at automotives

Posted: 07 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:high-voltage linear regulators? LDO? automotive?


Microchip Technology Inc. has rolled the MCP1790 and MCP1791 (MCP179X) high-voltage linear regulators (LDOs). With a continuous 70mA output, the ability to operate at a continuous input voltage of up to 30V and load-dump protection up to 43.5V, the LDOs are suited for automotive and industrial applications. They also feature low quiescent current, shutdown current and ceramic capacitor stability, which enable smaller, ultra-efficient designs at lower costs.

The MCP179X LDOs were designed for use in applications requiring continuous operation at high input voltages, such as 12V automotive and 24V industrial applications. The built-in load-dump protection feature shields the system from the voltage transients often found in these types of applications, particularly those in the automotive market. All of this, combined with ceramic output capacitor stability and a low quiescent current of just 70?A, enables more compact, power-efficient and reliable designs.

"The MCP179X LDOs are expected to help Microchip further expand into the ever-growing automotive and industrial markets through their high input-voltage capability and automotive grade voltage-transient protection," said Mikhail Voroniouk, product marketing engineer with Microchip's analog and interface products division.

Example automotive applications for the MCP179X LDOs include those where a device is powered directly from the car's battery, such as instrumentation lighting, power windows and locks, electronic accessory power adapters and stereo systems. The LDOs are also suited for high-voltage industrial applications such as security systems, fire alarms, thermostat controls and sensors, among others.

Users can choose between the simple, 3-pin MCP1790 LDO or the full-featured 5-pin MCP1791 LDO, which offers shutdown and power-good functionality. Both LDOs are available in thermally capable SOT-223 and DDPAK packages and can be used over a wide I/O voltage range at full currents, enabling them to support a broad range of application setups.

The MCP1790 is available in a 3-pin SOT-223 or DDPAK package. The MCP1791 is available in a 5-pin SOT-223 or DDPAK package. Samples of both LDOs are available today.

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