MAX17552AUB+

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 MAX17552AUB+ is a switcher-mode DC-DC converter designed for buck electric power conversion. The device operates from a 5V VCC supply and provides a regulated 3.3V output voltage from an input voltage programmable from 2.8V to 17V. With integrated switches, the MAX17552AUB+ yields high efficiencies over a wide load range.

At light loads, the MAX17552AUB+ operates in Pulse-Frequency Modulation (PFM) mode. PFM provides excellent light-load efficiency, where the internal high-side switch operates at equivalent duty cycles less than 50%. At medium and high load levels, the converter switches to PWM mode and provides excellent efficiency over the entire specified load range.

The internal compensation circuit provides optimal stability with a minimum of external components and a wide range of output capacitor selections. An internally regulated output voltage is programmable from 1.2V to 3.3V using a single external resistor. A high-precision voltage reference and a 0.8% total tolerance with a ±1.5% initial accuracy provides tight load regulation. The PFM mode turns off the output switch to enable high-light load efficiency with low quiescent current.

The MAX17552AUB+ also incorporates an adjustable soft-start time that allows for longer start-up time and compatibility with a wide range of output capacitors. Additional features of the MAX17552AUB+ include a power-good (PG) output indicator, a fixed-frequency PWM oscilator, and a power-save mode.

The MAX17552AUB+ is available in a low-profile 8-pin surface-mount package. It is ideal for a variety of applications, including cell phone compartments and other portable equipment, as well as industrial systems.

Application Field

The MAX17552AUB+ is well suited for portable equipment and other systems requiring high performance, efficient power conversion with minimum board space requirements. Typical applications include cell phone compartments and other portable equipment, as well as industrial systems.

Working Principle

The MAX17552AUB+ is a battery-powered, boost or buck converter that can operate from an input voltage of 2.8V to 17V. The device utilizes pulse-width modulation (PWM) switching in the buck topology to provide good efficiency while maintaining precise output voltage regulation. The boost topology employs fixed-frequency pulse-width modulation (PFM) switching to provide low output ripple, good light-load efficiency, and fast transient response for input line and load changes.

The device\'s PWM switch consists of an n-channel MOSFET integrated with an error amplifier and an oscillator. The error amplifier responds to the output voltage error signal and controls the gate of the MOSFET to maintain the output voltage at its setpoint. The oscillator provides the reference signal to the error amplifier, allowing it to operate the MOSFET at a fixed frequency.

In PWM mode, the error amplifier will oscillate at the reference frequency and generate a switching signal. If a voltage error is detected, the error amplifier will increase or decrease its output to the MOSFET gate to maintain the output voltage. As a result, the output voltage will be regulated to within the accuracy of the reference voltage.

The MAX17552AUB+ PFM controller operates in two phases. In the first phase, the MOSFET is allowed to start-up, and the error amplifier ensures the output voltage has reached regulation. In the second phase, the MOSFET is switched on and off at a fixed-frequency to provide power to the load while keeping the output voltage steady. If a voltage error is detected, the error amplifier will increase or decrease its output to the MOSFET gate, allowing the output voltage to remain within its specified range.

The MOSFET switch can intermittently turn off during the PFM operating mode. This allows for a light-load efficiency improvement with low quiescent current and no switching losses.

Aside from maintaining precise regulation, the MAX17552AUB+ also offers advantages such as adjustable soft-start time, a power save mode, and power good output indicator. All these features are readily available in the device and can be used in a variety of applications.

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