MAX861IUA-T

Voltage - Output (Min/Fixed):	-Vin, 2Vin
Base Part Number:	MAX861
Supplier Device Package:	8-uMAX
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm 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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The MAX861IUA-T is a voltage regulator from Texas Instruments designed for DC-DC conversion. This device is a switching regulator, utilizing pulse-width modulation (PWM) to control the output voltage. It is an integrated switching device comprised of an internal power MOSFET, an internal oscillator, an internal waveform generator, a voltage reference and a monitor. The MAX861IUA-T is suitable for use in applications such as automotive electronics, renewable energy, power supplies and battery charging systems.The MAX861IUA-T is designed to convert a voltage in the range of 3.3V to 40V to a desired output voltage. The integrated MOSFET is capable of driving currents up to 1.5A. The output voltage is adjustable with an external resistor divider and can be set to a voltage with a resolution of 3.2mV. Although it has a minimum on-time of 75ns, the device is capable of switching frequencies up to 1 MHz. It is also capable of providing a low ripple current by minimizing the transient response and keeping the switching frequency low.The MAX861IUA-T is a highly efficient regulator, with an efficiency of 8%-92%. It also provides protection against overcurrent, undervoltage lockout, thermal shutdown and frequency jittering. The jittering function is available to reduce both acoustic noise and EMI generated by the switching regulator.The MAX861IUA-T utilizes a synchronous rectification control and two voltage comparators. The internal oscillator creates a sawtooth waveform which is used as the control input to the power switch. The waveform is generated and amplified by the internal circuitry. When the amplified waveform exceeds the voltage at the divided down output voltage, the power switch is turned off and the rectifier is turned on. The maximum output voltage is determined by the external resistor divider.The MAX861IUA-T also includes protection against overcurrent and undervoltage lockout. The overcurrent protection will shut off the switch if the current exceeds a certain level. Undervoltage lockout will shut off the switch if the input voltage falls below a certain level. The internal thermal shutdown keeps the device from operating at temperatures above the specified temperature limit.In conclusion, the MAX861IUA-T is a DC-DC voltage regulator designed for applications requiring high efficiency and fast switching frequency. It is suitable for use in automotive electronics, renewable energy, power supplies, and battery charging systems due to its high efficiency and comprehensive protection features.

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