AOZ2151QI-09

Series:	*
Packaging:	Tape & Reel (TR)
Part Status:	Active
Mounting Type:	Surface Mount
Package / Case:	18-UFQFN Exposed Pad
Supplier Device Package:	18-QFN (3x3)

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AOZ2151QI-09 Application Field and Working Principle

AOZ2151QI-09 is a highly efficient DC-DC synchronous buck switching regulator manufactured by Diodes Incorporated. It is specifically designed for power-management purposes, including providing power to end-products such as PDAs, phones, MP3 players, and other portable applications. The AOZ2151QI-09 is a member of the AOZ family of high-efficiency low-voltage synchronous switching regulators. This device operates over 2.5V to 5.5V input voltage range and delivers a regulated output voltage from 0.5V to 3.3V. The output current of the device can be programmed up to 500mA by an external resistor and a maximum power of 3W is achievable with an efficiency of up to 96%.

AOZ2151QI-09 Internal Structure and Functional Blocks

The AOZ2151QI-09 is an integrated DC-DC synchronous buck regulator with a multiple number of on-chip features, including under-voltage protection and over-voltage protection. The IC consists of three major blocks: the current-mode PWM controller, driver, and MOSFET. The integrated PWM controller contains internal logic circuits that combine the user-selected feedback voltage, input voltage and internal reference voltage to provide the switching timing signals. The internal compensation network comprising a variable oscillator, an error amplifier and a voltage reference provide the current-mode control needed to regulate the output voltage and provide a clean, ripple free output.The output drive block contains two power MOSFETs, the high-side power Stage FET and the low-side power Stage FET. The output drive has been designed to reduce the RDSon of the output stage FETS to increase the power efficiency and reduce power dissipation.

AOZ2151QI-09 Working Principle

The AOZ2151QI-09 regulator requires an external resistor to ramp the output voltage up and down, as well as voltage reference to maintain the desired output voltage. The external resistor serves as a ramp generator to set the oscillator frequency at the desired value.In operation, the AOZ2151QI-09 regulates the output voltage of a power supply to the desired voltage. The input voltage is filtered and then applied to the primary side of the MOSFET switch, which is driven by the internal driver. The inductor and capacitor form a power supply which filters out the noise and ripple. The integral error amplifier senses the feedback voltage and compares it to the internal reference voltage and adjusts the duty cycle of the switch accordingly. The load current is sensed and the output current limit is determined from the current sense resistor connected to the output, in series with the load. When the load current reaches the set current limit, the error amplifier will reduce the duty cycle proportionately to prevent over-current operation. The output voltage is sensed and compared against an internal reference voltage. When the sensed output voltage exceeds the reference voltage, the output voltage is regulated back to the desired level. In this way, the output voltage is maintained to the required level.

AOZ2151QI-09 Applications

The AOZ2151QI-09 device is suitable for a wide range of applications. It is ideal for applications that require low output voltage, such as in PDAs, phones, MP3 players, and other portable applications. This device can be used to power LEDs, LCDs and DC motors. The device is also suitable for powering FPGA and microcontroller based circuits.

Conclusion

The AOZ2151QI-09 switching regulator from Diodes Incorporated is a high efficiency, low voltage synchronous buck device specifically designed for power-management purposes. It is suitable for a wide range of applications, including powering LEDs, LCDs, DC motors, and microcontroller and FPGA based circuits. The device requires an external resistor to ramp the output voltage up and down and voltage reference to maintain the desired output voltage. With its high efficiency and low power dissipation, the AOZ2151QI-09 device is ideal for applications that require low output voltage.

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