MAX8795AETJ+T

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

The MAX8795AETJ+T is a 3.2A digital 4MHz buck voltage regulator, featuring accuracy to 0.3%. With a wide input voltage range of 2.8V to 5.5V and an adjustable output voltage range of 0.8V to 3.3V, the regulator is optimized for powering digital load systems such as LCD screens, microprocessors, and RF transceivers. The MAX8795AETJ+T utilizes a proprietary current mode algorithm to achieve fast transient response times, good load and line regulation, as well as improved light load regulation capability. The device features phase-lockable frequency, adjustable soft-start, and power-good output. It also provides programmable average current limiting and over-temperature protection. The MAX8795AETJ+T is available in a 3mm x 3mm 8-pin TQFN package and is fully-specified for operation over the extended -40°C to +85°C temperature range.

Applications

• LCD Display Panel Power Supply
• Microcontrollers and DSP Core Power Supplies
• Network Processors
• RF Transceivers with BA Sychronous Rectifier
• Telecommunication Power Supplies
• TLVDS and LVDS Power Supplies

Working Principle

The MAX8795AETJ+T is designed using a current mode control architecture. This design approach improves load and line transient response compared to traditional voltage mode control. This can be achieved by eliminating typical slow transient response and high output capacitance requirements of voltage mode controllers ( Figure 1).

The MAX8795AETJ+T regulates the output voltage through constant current pulses. It monitors a voltage across a sense resistor. A voltage error amplifier feeds the voltage error signal to a state machine that controls the output current. This state machine is responsible for setting the frequency generater and producing the feedback control signals. The frequency can be set via a resistive voltage divider located between the FREQ pin and the VCC pin, or it can be set by an external pulse generator. The output current is monitored through an output sense amplifier and is compared in an internal current comparator. When the current rises above the preset constant current level, the state machine turns off the output switch. As the switch turns off, the output energy is stored in the inductor and the output voltage drops.

The average output current is set by an external resistor (R SENSE ) connected between ground and the CTL pin. This resistor value is compared internally to the maximum current specified by the enable pin, EN. When the average output current level is reached, the enable pin is set to high, turning off the output switch.

The MAX8795AETJ+T also features a soft-start feature to reduce inrush current. This is implemented by an internal current ramp generator and comparator that limits the output current until the set soft-start time has elapsed.

Conclusion

The MAX8795AETJ+T is a 3.2A digital 4MHz buck voltage regulator featuring accuracy to 0.3%. It provides a wide input voltage range of 2.8V to 5.5V and an adjustable output voltage range of 0.8V to 3.3V. The device utilizes a proprietary current mode algorithm to achieve fast transient response times and good load and line regulation. It also offers programmable average current limiting, over-temperature protection, and adjustable soft-start. The device is available in a 3mm x 3mm 8-pin TQFN package and is fully-specified for operation over the extended -40°C to +85°C temperature range, making it an ideal shoice for digital load systems such as LCD screens, microprocessors, and RF transceivers.

The specific data is subject to PDF, and the above content is for reference