MAX1681ESA

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MAX1681ESA

The MAX1681ESA is a versatile DC DC switching regulator controller from Maxim Integrated, which is mainly used for voltage regulation in PMIC applications and is part of the Voltage Regulators - DC DC Switching Regulators line. This application note details an example circuit for a 3A, 36VOUT buck regulator circuit and summaries the features and features of the device and the key specifications relevant to the design.

MAX1681ESA Application field and working principle

The MAX1681ESA provides a high efficiency, adjustable output voltage, low EMI, 3A step-down dc-dc switch mode power converter. The controller is well-suited for systems where high efficiency, low output ripple and low quiescent current are required. The low output voltage range makes the device ideal for generating power supplies for PMICs where low voltage regulation is needed.

The MAX1681ESA comprises two integrated CMOS driver and power stages. The driver stage is optimized for high frequency operation with high efficiency and low ripple. The power switch features a low on resistance (RLS1) of 0.22 ohms, which allows for high efficiency operation with low output ripple. The device also includes an enable (EN) and a frequency (F/V) pin for controlling the output voltage, together with a soft start (SS) pin to set the soft start ramp time.

The device can operate over a wide input voltage range of 4.5V to 36V. Additionally, the device has excellent line and load regulation, as well as shutdown current as low as 8uA over the entire operating temperature range.

The MAX1681ESA can be used in a wide range of power management applications, ranging from powering DSPs, microcontrollers and ASICs to regulating power for hard drives, cellular phones and other embedded devices. In particular, the MAX1681ESA is an ideal solution for providing an adjustable regulated output voltage for PMIC applications such as battery charging and monitoring.

Features & Benefits

• Wide Input Voltage Range: 4.5V to 36V

• High Efficiency: Up to 97%

• Low Output Ripple: <3mV

• Adjustable Output Voltage: 0.9V to 6V

• Frequency (F/V) and Enable (EN) Pins

• Low Shutdown Current: 8uA Over Temperature

Essential Specifications

• Input Voltage Range: 4.5V to 36V

• Switching Frequency: 300kHz to 1.4MHz

• Output Voltage Range: 0.9V to 6V

• Output Current: 3A

• Output Ripple: <3mV

• Shutdown Current: 8uA

Conclusion

The MAX1681ESA is an ideal choice for power management applications that require an adjustable output voltage and high efficiency. The wide input voltage range, low output ripple, low quiescent current and low shutdown current make the device an attractive option for powering PMICs. Additionally, the device offers excellent line and load regulation, as well as robust protection features.

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