MAX861ISA+T

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:	Tape & Reel (TR)

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Introduction

The MAX861ISA+T is a dual-input, DC-DC step-up, step-down regulator with up to 2A peak output current capability. It is an integrated circuit (IC) designed for cost-sensitive, battery-powered applications, such as handheld equipment and small, portable alarm systems. It has a narrow operating range of 1.6V to 5.5V, making it suitable for use in both battery- and line-powered systems. Additionally, its proprietary switching architecture ensures reduced ripple and noise, excellent efficiency, and low dropout voltage. This makes it especially suitable for low power applications.

Application Field

Since the MAX861ISA+T has a wide input range, it is suitable for a wide range of applications. It is often used in portable equipment such as portable phones, camcorders, digital cameras, audio players, handheld computers, and PDA devices, as well as any system that requires a low-power, high-efficiency DC-DC converter. It can also be used in car entertainment systems, notebook PCs, and embedded systems.

Working Principle

The MAX861ISA+T incorporates a proprietary switching architecture into its design. This utilizes an internal low-power integrated switching regulator to control an external MOSFET switch. This permits the device to achieve higher efficiency and lower dropout voltages than other competing DC-DC converters. Additionally, the switching frequency of the MAX861ISA+T is typically 1 MHz, which results in a more efficient use of the output inductor and capacitor.The MAX861ISA+T also includes a number of integrated protections, such as overload, under-voltage, and over-voltage, to ensure reliable operation. It also has provisions for safe start-up after the initial power-on, and for peak current-limit to protect against an overload on the output.

Conclusion

The MAX861ISA+T is an ideal choice for cost- and low power-sensitive applications, such as handheld equipment and small, portable alarm systems. Its wide input range and integrated protection circuits make it suitable for many types of applications, while its proprietary switching architecture ensures reduced ripple and noise, excellent efficiency, and low dropout voltage. As such, the MAX861ISA+T is an excellent choice for DC-DC switching regulators.

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