MAX7349AEG+

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The MAX7349AE+ is a high performance, low power, register mapped low dropout linear regulator and power supply supervisor (PSS) integrated circuit.

This advanced LDO device provides active regulation and comprises the industry’s highest-performance set of active and passive power management features. Supervisory functions include over-current, short-circuit protection, output voltage monitoring, and fault response control.

The MAX7349AE+ is intended for use in applications from sub 1V to 3.6V, such as cell phone system power, audio amplifier power, programming for flash memory, PDAs, personal computers, and a variety of other systems.

Application Fields

1. Cell Phone System Power: The MAX7349AE + can provide fast power (under-voltage detection) and optimization in cell phone system architectures.
2. Audio Amplifier Power: The MAX7349AE + provides an active output voltage switching function, which is used in high-end audio amplifier systems. In this type of systems, the amplifier system can be disabled by the MAX7349AE +.
3. Programming for Flash Memory: In some systems, programming for flash memory must be done with a low-noise voltage regulator. The MAX7349AE + is well suitable for this kind of applications.
4. PDAs: The MAX7349AE + can provide fast power and optimization in PDA system architectures.
5. Personal Computers: The MAX7349AE + is a low power IC that can provide power conversion and monitoring in personal computer applications.
6. Wireless and Local Area Networks: The MAX7349AE + can provide fast power, system optimization and fault control for wireless and local area networks.
7. Microprocessor and Microcontroller-Based Systems: The MAX7349AE + has low quiescent current and low shutdown current modes to further optimize the power budget for microprocessor and microcontroller-based systems.

Working Principle

The MAX7349AE + is a register-mapped device that comprises a low dropout linear regulator, a power-supply supervisor (PSS), a power-good comparator, and various fault-control constants tied to one or more internal registers that are accessed via a two-wire serial interface.

The regulator portion is composed of a P-channel pass element, an internal voltage reference, a current limit configuration, and other functions. It regulator output voltage can be programmed through a two-wire serial interface. It has an 8101% duty cycle in the dropout region and can offer a very low minimum dropout voltage (0.1V) when operating in the dropout region. This internal regulator can implement power-on sequencing and power-off sequencing. It can also provide active voltage switching from its current output voltage setting to a new target voltage setting.

The power-supply supervisor portion monitors the output voltage and provides a power-good flag if the output voltage is within allowable limits. If an over-current, short-circuit, or over-temperature fault is detected, the MAX7349AE + can take action (such as disabling the output) according to user-programmed fault-control settings.

The MAX7349AE + provides over-voltage monitoring and fault-control capability. The OVLO feature enables the device to detect an over-voltage condition on the output and respond with a fault-response action. The fault-response action can be one of two pre-programmed fault-control settings. These settings are programmed internally in the device.

The MAX7349AE + is designed to provide its advantages at very low quiescent current and shutdown current. It has current limit protection to protect the device against over-current conditions. It can shut down the device in case of an over-voltage, over-temperature or short-circuit fault. It has a gain control feature that can be used to fine-tune the output voltage based on load current requirement.

Overall, the MAX7349AEG+ is an all-in-one device ideally suited for applications from sub 1V to 3.6V and is specifically designed for active regulation and monitoring applications such as cell phone systems, audio amplifiers, programming for flash memory, PDAs, personal computers, and a variety of other systems.

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