MAX634CPA+

Voltage - Output (Min/Fixed):	-2.6V
Base Part Number:	MAX634
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:	100Hz ~ 75kHz
Current - Output:	150mA
Voltage - Output (Max):	-20V
Series:	--
Voltage - Input (Max):	16.5V
Voltage - Input (Min):	2.6V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck-Boost
Output Configuration:	Negative
Function:	Step-Up/Step-Down
Part Status:	Active
Packaging:	Tube

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MAX634CPA+ application field and working principle

MAX634CPA+ is a DC-DC switching regulator with a wide range of applications. It\'s a part of the PMIC (Power Management Integrated Circuit) family of voltage regulators, specifically in the DC-DC switching regulator category. This type of voltage regulator is suitable for applications where a wide AC or DC input range is required, specifically those requiring high start-up current and low-noise output voltage.The MAX634CPA+ chip is designed to regulate voltage at any point between the input voltage and output voltage level. This makes the chip suitable for applications in the fields of industrial electronics, telecommunications and consumer electronics. The chip provides a high power conversion efficiency by using pulse-width modulation (PWM) to regulate voltage at a fixed frequency, allowing the output voltage to be accurately controlled. In addition to its basic voltage regulation capabilities, the MAX634CPA+ provides several advanced features to make it ideal for applications in harsh environments. It has adjustable soft-start/restart functions that can be used to reduce start-up current and minimize overshoot during switch-on. It also has overvoltage protection, input undervoltage protection and thermal shutdown, to protect it from excessive voltage and current.The MAX634CPA+ is designed to work with a wide range of power sources, including a wide range of AC and DC supplies. It offers a user adjustable output voltage of up to 12V and maximum output current of 200mA. It is designed to operate in temperatures from -40°C to 85°C and is provided in a 7-pin SOP package. It is also RoHS-compliant, so it is environmentally friendly.The working principle of the MAX634CPA+ is based on the basic Operation of a PWM (Pulse Width Modulation) voltage regulator. The chip uses the PWM approach to regulate the output voltage at a given frequency. To achieve this, it is driven with a sawtooth waveform which has a frequency that is independent of the supply voltage. The voltage amplifier within the chip amplifies the sawtooth waveform to create a wider pulse width, which sets the output voltage of the regulator. The voltage on the output is dependent on the ratio of the width of the wide pulse and the width of the narrow pulse. This sawtooth clock also drives a current mirror, whose output is summed with the output of the voltage amplifier and then filtered by an external smoothing capacitor to create the output voltage. This allows the chip to quickly adjust the output voltage, while still maintaining a stable and predictable voltage output.In summary, the MAX634CPA+ is a DC-DC switching regulator, suitable for applications where a wide AC or DC input range is needed. It provides a stable, noiseless output voltage and is designed to work with a range of power sources. It offers a user adjustable output voltage of up to 12V and a maximum output current of 200mA. The chip also has additional features such as adjustable soft-start/restart, overvoltage protection, input undervoltage protection and thermal shutdown, making it a great choice for industrial, telecom and consumer electronics applications. The chip uses PWM to regulate the output voltage, by creating a sawtooth waveform with an adjustable width, which is then filtered and amplified to create the output voltage.

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