MAX761CPA

Voltage - Output (Min/Fixed):	5V (12V)
Base Part Number:	MAX761
Supplier Device Package:	8-PDIP
Package / Case:	8-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 70°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	300kHz
Current - Output:	1.5A (Switch)
Voltage - Output (Max):	16.5V
Series:	--
Voltage - Input (Max):	16.5V
Voltage - Input (Min):	2V
Number of Outputs:	1
Output Type:	Adjustable (Fixed)
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Obsolete
Packaging:	Tube

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MAX761CPA Application Field and Working PrincipleThe MAX761CPA is a CMOS, low-power, dual-output DC-DC switching regulator powered by Automotive’s battery (3.3V to 17V) that can supply 1.8V/50mA and 3.3/100mA outputs. It also has shutdown capability. This switching regulator has an extensive array of built-in protection features including overvoltage protection, overcurrent protection, open load protection and short-circuit protection.

Overview of MAX761CPA

The MAX761CPA is a part of the DC-DC switching regulators, a branch of the PMIC (Power Management Integrated Circuit) family. It is specifically designed to work in applications that require low power consumption and robust protection features. This low-power regulator supports a wide input voltage range of 3.3V to 17V, output polarity of both positive and negative and operates between 40kHz and 350 kHz. The MAX761CPA includes output voltage control and comprehensive fault protection, in addition to its ability to remain in Active Mode for as low as 0.5uA. It is also stable with ceramic capacitors and its quiescent current consumption (Iq) is 14uA.

MAX761CPA Application

The MAX761CPA is especially suitable for automotive applications such as providing power to vehicle tracking systems and providing power to intelligent 3-phase battery chargers. It can also power peripheral logic in automotive body systems, including audio systems and onboard entertainment.The MAX761CPA is also suitable application in industrial equipment such as HVAC systems, robotics, and solar energy systems. It is also used in battery operated portable equipment such as PDA, data loggers and GPS receivers.

MAX761CPA Working Principle

The MAX761CPA DC-DC switching regulator works by having an oscillator drive an internal power switch, which connects the input voltage to an inductor. The inductor stores energy when the power switch is on, converting it to a continuous current for the output voltage when the power switch is off. The switching frequency and amplitude of current delivered by the inductor are controlled by the duty cycle ratio of the switch, which is specified by a capacitor connected to the regulator’s control pins.The MAX761CPA utilizes an adaptive on-time control scheme to regulate the output voltage. It samples the output voltage and, if it is below the target voltage, it increases the duty cycle of the switch by raising the voltage on the control pin. This increases the amount of current drawn from the input and stored in the inductor, which is then delivered as a higher output voltage. Conversely, if the output voltage is above the target voltage, the voltage on the control pin is reduced, which decreases the duty cycle of the switch and reduces the current drawn from the input and stored in the inductor. In this way, the output voltage is regulated. The MAX761CPA also includes extensive fault protection features that protect the output from overvoltage, overcurrent, open load and short circuit conditions.

Conclusion

In conclusion, the MAX761CPA DC-DC switching regulator is a low power, robust and reliable device which is suitable for a wide range of automotive, industrial and portable applications. It offers overload protection, overvoltage protection, short circuit protection, open load protection, and flexible output control. It has an adaptable control scheme, is stable with ceramic capacitors, and has low quiescent current consumption. All of these features make the MAX761CPA an ideal choice for power management applications.

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