MAX861ISA

Voltage - Output (Min/Fixed):	-Vin, 2Vin
Base Part Number:	MAX861
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-25°C ~ 85°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	13kHz, 100kHz, 250kHz
Current - Output:	50mA
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	1.5V, 2.5V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Charge Pump
Output Configuration:	Positive or Negative
Function:	Ratiometric
Part Status:	Active
Packaging:	Tube

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MAX861ISA: Voltage Regulator DC-DC Switching Regulators Applications and Working Principle

DC-DC switching regulators are widely used in power management because they provide a high efficiency power conversion, generally more efficient than linear regulators. As expected, many companies produce devices with this technology, and MAXIM is no exception. The MAX861ISA is a monolithic, high-efficiency DC-DC switching regulator that integrates a high-efficiency, low-power, step-up DC-DC switch in one small package. This device is designed to provide up to 250mA of operating current at 1.2V with up to 90% efficiency.

Integrated Features

The MAX861ISA offers a variety of integrated features including an adjustable output voltage, thermal shutdown and reverse battery protection. The device also includes an adjustable soft-start circuit, which ramps the output voltage up to the programmed value, minimizing stress to the power supply. Additionally, the device includes an integrated feedback voltage comparator with remote sensing capability, allowing the system designer to accurately control the output voltage. The maximum output current is adjustable via an external current limit resistor, allowing for easy customization of load currents.

Adjustable Output Voltage

The MAX861ISA features an adjustable output voltage that is set via an external 1.2V reference voltage. This reference voltage can be supplied externally or generated internally using an internal reference voltage. By adjusting the 1.2V reference voltage, the output voltage can be accurately adjusted.

Temperature Monitor

The MAX861ISA integrates a temperature monitor that allows the system designer to keep track of the device temperature via external temperature sensing elements. An internal temperature detector detects the device temperature and then turns off the output if the temperature rises above the specified limit. This feature helps ensure that the device will operate safely and properly.

Reverse Battery Protection

The MAX861ISA includes a reverse battery protection circuit that prevents damage to the device when the input voltage is reversed. The device detects the reversed input voltage and immediately turns off the output to protect the device from any damage.

Soft-Start Circuit

The MAX861ISA includes an adjustable soft-start circuit that ramps the output voltage up to the programmed value, minimizing stress to the power supply. This feature eliminates undesired inrush currents and improves system power-up performance.

Output Current Limiting

The MAX861ISA features an adjustable output current limit. The output current limit can be adjusted via an external current limit resistor. This feature allows the designer to customize the output current according to the application’s requirements.

Conclusion

The MAX861ISA is a monolithic, high-efficiency DC-DC switching regulator that integrates a number of innovative features, such as an adjustable output voltage, a temperature monitor, reverse battery protection, and a soft-start circuit. Additionally, the device includes an adjustable output current limiting feature, which allows the designer to customize the output current according to the application’s requirements. The MAX861ISA is an ideal choice for many power management applications.

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