MAX8667ETEAB+

Voltage/Current - Output 3:	2.85V, 300mA
Base Part Number:	MAX8667
Supplier Device Package:	16-TQFN (3x3)
Package / Case:	16-WFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply:	2.8 V ~ 5.5 V
w/Sequencer:	No
w/Supervisor:	No
w/LED Driver:	No
Series:	--
Voltage/Current - Output 2:	1.8V, 1.2A
Voltage/Current - Output 1:	1.2V, 600mA
Frequency - Switching:	1.5MHz
Number of Outputs:	4
Function:	Any Function
Topology:	Step-Down (Buck) Synchronous (2), Linear (LDO) (2)
Part Status:	Obsolete
Packaging:	Tube

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MAX8667ETEAB+ Application Field and Working Principle

Introduction: An Overview of the MAX8667ETEAB+

The MAX8667ETEAB+ is a highly integrated switch-mode power supply (SMPS)-based power management integrated circuit (PMIC) from Maxim Integrated. This product series is designed for 3V to 5.5V operation and is capable of delivering up to 10W of output power. The MAX8667ETEAB+ features an integrated 1.2MHz switching regulator, low-startup current (1mA typical), integrated switching FETs with 6Vdrive/4A outputs, and low quiescent current. The MAX8667ETEAB+ is equipped with an integrated high-voltage linear regulator featuring wide input voltage range (2.3V to 5.5V) and low-startup current (<50uA typical). On top of it, the device can be programmed to operate at a variety of output frequencies, making it suitable for high-power or low-noise applications.The MAX8667ETEAB+ is designed to be easy to implement and configure. When used as a single-output power supply, the device requires only a few external components and can be configured via I2C interface. The device also includes an accurate voltage reference, over-voltage protection, and power-on reset.

Applications for the MAX8667ETEAB+

The MAX8667ETEAB+ is suitable for a range of applications which require efficient power conversion, such as cellular phones, PDAs, notebook computers and similar mobile electronics. In addition to its high efficiency and ease of implementation, the device offers several features which make it ideal for applications where accuracy, space saving and power conservation are key considerations.Specifically, the MAX8667ETEAB+ is well suited for space-constrained and battery-powered applications due to its small size and low quiescent current. The integrated linear regulator and buck converter are designed to reduce the component count and minimize noise, while the programmable output frequency offers flexibility to optimize performance.

Block Diagrams, Principles of Operation, and Timing

Figure 1 shows the block diagrams of the MAX8667ETEAB+ PMIC. The MAX8667ETEAB+ consists of an integrated power conversion subsystem and an I2C/SPI interface. The power conversion subsystem consists of a buck switching regulator, a linear regulator, and a dedicated ADC for monitoring purposes.The MAX8667ETEAB+ employs a buck switching regulator with synchronous rectification for high efficiency over a wide range of load currents. The synchronous buck regulator operates in pulse-width-modulated (PWM) mode for low noise operation, and is capable of operating up to 1.2MHz with a 10.2V input voltage. The switching frequency can be programmed via I2C interface using one of the two programming pins.The integrated linear regulator provides high accuracy over a wide input voltage range, and is capable of delivering up to 300mA of output current. The linear regulator has a programmable output voltage range from 0.8V to 5.5V, and can be configured for either dedicated operation or in combination with the buck regulator.The power distribution logic block manages the sequential start-up of the linear and switching regulators for independent operation or for combination operation. The power distribution logic also includes an over-voltage protection circuit, which prevents the output voltage from exceeding the programmed level.The timing block inside the MAX8667ETEAB+ allows the user to program the duty cycle and sequencing of the buck and linear regulators in order to optimize power savings and EMI during various load conditions.

Conclusion

The MAX8667ETEAB+ is a highly integrated PMIC designed to provide an efficient voltage-regulated power supply for a variety of applications. This device is equipped with a buck switching regulator, a linear regulator, and various protective functions, and can be programmed to operate at a variety of frequencies via I2C.The MAX8667ETEAB+ is suitable for space-constrained and battery-powered applications where efficiency, accuracy, and space savings are key considerations. With its small size and low quiescent current, this device is an excellent choice for applications that require an effective and efficient power conversion solution.

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