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Introduction to MAX16909RATE/V+T

The MAX16909RATE/V+T is a low-power monolithic DC-DC converter with a strong range of load tracing, power supply rejection ratio (PSRR), and RF susceptibility performance. This device is suitable for a wide variety of applications, including battery-powered systems.

Application Field and Working Principle of MAX16909RATE/V+T

As a DC-DC switching converter with a wide selection of features, the MAX16909RATE/V+T is ideal for battery-powered applications, high power density and high efficiency. It utilizes high-frequency switching with low-drop out (LDO) feedback to provide an input voltage range from 1.8 V to 5.5 V and output voltage range from 0.45 V to 5.5 V. The built-in switching frequency is triggered by the voltage multiplied by the duty cycle of the output current, with supplies up to 800 mA of continuous output current and peak currents up to 1.5 A.

The MAX16909RATE/V+T offers very high PSRR and excellent EMI performance. It has low output noise, which is important in applications such as radio-frequency (RF) receivers and audio. With minimal external components and low standby current, the MAX16909RATE/V+T provides efficient, ultra-small designs with excellent load tracing and PSRR performance.

Detailed Working Principle of MAX16909RATE/V+T

The MAX16909RATE/V+T integrates a high-side power MOSFET and low-side power MOSFET. The gate of the high-side MOSFET is driven by an external pulse width modulator (PWM). The gate voltages of the two MOSFETs are clamped by the integrated charge pump and driven to the external supply voltage VIN of the IC. The internal current-sense resistor is connected between the two power MOSFETs to monitor the conduction current of the MOSFETs. The current sense voltage (VCS) is monitored by the current-mode loop of the IC, which further adjusts the duty cycle of the high-side MOSFET to maintain the current in the power MOSFETs and hence the output voltage VOUT more effectively.

The threshold voltage of VCS of the MAX16909RATE/V+T is designed to be adjustable through the two external resistors, R SLOPE and R REF. The adjustable (slew rate) and fixed (reference voltage) thresholds of VCS are set by the ratio of these two resistors and determine the maximum output current based on the dynamic current-mode control.

The MAX16909RATE/V+T also includes a low-dropout (LDO) linear regulator to ensure that the feedback voltage is maintained within tolerance. This provides bidirectional load tracing capability, which is extremely beneficial as it reduces power supply output ripple. The LDO also has the capability to supply a voltage up to 1 A of output current.

Features of MAX16909RATE/V+T

The MAX16909RATE/V+T has many features that make it an ideal choice for a variety of applications. It features an adjustable slew rate that can be set to optimize switching frequency for different application requirements. Its built-in charge pump also ensures that both MOSFET gates are driven to an independent voltage, ensuring that the power dissipation is evenly distributed across them. This reduces power loss, allows for thermal relaxation and safe operation of the device.

Other features of the device include:

• Low operating current.
• Compact, low-profile 6-pin (TSOT-23 package), ideal for occupancy-constrained designs
• Adjustable maximum duty cycle
• Wide input voltage range, 1.8 V to 5.5 V
• High power supply rejection ratio (PSRR)
• Excellent RF susceptibility performance
• 200 kHz to 1 MHz switching frequency range
• 800mA continuous output current and peak currents up to 1.5 A
• Output voltage range from 0.45 V to 5.5 V
• Ideal for battery-powered systems

Conclusion

The MAX16909RATE/V+T is a highly efficient DC-DC switching converter with a wide range of features such as low drop out (LDO) feedback, adjustable switch frequency and a wide input voltage range. It also has high power supply rejection ratio, excellent RF susceptibility performance and low output noise, making it suitable for a wide range of battery-powered applications.

By combining its low-power, space-saving design and high-performance features, the MAX16909RATE/V+T offers the solutions for both high power and low power applications, providing a very convenient choice for power management and other applications.

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