MAX8723ETE+

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The MAX8723ETE+ is a highly integrated current-mode pulse-width modulation (PWM) controller with integrated low-resistance MOSFETs designed especially for laptop adapters and slim chargers. The device is designed to contain a low typical voltage drop. The plus version of the MAX8723ETE also contains additional current limiting and safety timing circuitry to meet the stringent European requirements of no-load and short-circuit protections. The IV characteristic is improved over the previous generation for better efficiency in low-current applications. The high level of integration helps reduce the number of components, making it possible to use small surface mount components and small form factor adapter boards.

Application Field and Working Principle

The MAX8723ETE+ is typically used in high power battery pack adapters, ac/dc power adapters and notebook laptop chargers. The device can output voltages as low as 0.5V with ±5% regulation. It is also used in applications requiring small standby power, such as mobile phones and digital televisions, where the low power efficiency of the device help reduce standby power consumption. The MAX8723ETE+ uses a current-mode PWM controller with highly integrated on-chip MOSFETs to control the output voltage. The MOSFETs switch at a frequency fixed at 350 kHz. The current-mode controller offers a fast transient response, improved noise immunity and allows the device to run with a low 300 kHz pulse slopes without noticeable optimization of the gate drive. The device also features a low internal resistance of 1 mΩ and a low external gate drive of 4V, further improving the efficiency and power density.

The MAX8723ETE+ comes with multiple protection features, such as short-circuit protection, over-temperature shutdown, over-voltage and under-voltage protection. In addition to these protection features, the MAX8723ETE+ also contains current-limiting circuitry and timing circuitry to meet the stringent European requirements. The device also has an Enable pin, allowing the user to easily control and disable the output to achieve the lowest power consumption.

To sum up, the MAX8723ETE+ is a highly integrated current-mode PWM controller for laptop adapters and slim chargers, which includes low typical voltage drop, improved IV characteristic and highly integrated on-chip power MOSFET with low internal resistance. The integrated protection features along with the low power efficiency and stand-by power consumption make it an ideal device for high power battery pack adapters, ac/dc power adapters and notebook laptop chargers.

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