MAX766CPA+

Voltage - Output (Min/Fixed):	-1V (-15V)
Base Part Number:	MAX766
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:	105mA
Voltage - Output (Max):	-16V
Series:	--
Voltage - Input (Max):	16V
Voltage - Input (Min):	3V
Number of Outputs:	1
Output Type:	Adjustable (Fixed)
Topology:	Buck-Boost
Output Configuration:	Negative
Function:	Step-Up/Step-Down
Part Status:	Active
Packaging:	Tube

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Introduction

MAX766CPA+ is a high-performance DC-DC switching regulator designed to provide a regulated output voltage and convert input voltages of 2V to 15V to either a 2V to 12V or a 4V to 25V output voltage. It is also useful for reducing battery waste by supplying a constant regulated voltage as the battery voltage drops. This IC is manufactured using advanced CMOS technology for low-power consumption, low parts count, and small size. The MAX766CPA+ can operate at frequencies up to 400kHz, allowing for small inductor and capacitor dimension with lower cost and reduced footprint. It has an output current of up to 2.5A with a thermal shutdown feature to prevent overheating.

Application Field

The MAX766CPA+ is suitable for wide variety of applications in general-purpose portable electronic equipment. It is ideally suited for mobile phones, PDAs, digital cameras and medical equipment that requires dependable, low-noise power conversion. For applications like mobile phones and PDAs, the MAX766CPA+ can be used as a 3V to 4.2V voltage regulator. This is especially useful when these devices are Running on a full charge, as the output voltage can be automatically lowered to conserve battery. The MAX766CPA+ can also be used to dynamically switch between two or more output voltage levels, allowing for circuitry to automatically switch between two distinct voltages.When used in consumer applications, the MAX766CPA+ can address the design challenges inherent in digital signal processing and RF transmission systems including DC-DC conversion, signal level shifting, and signal processing systems that require regulated source levels over a wide range of supply conditions.

Working Principle

The MAX766CPA+ DC-DC switching regulator works by regulating the output voltage to a fixed, predetermined level using voltage feedback. The MAX766CPA+ contains two high-gain error amplifiers that monitor the output voltage. When the output voltage is lower than the reference voltage, the error amplifier, drives the pulse width modulator (PWM) increasing the duty cycle of the switching transistors, which increases the output voltage. When the output voltage is higher than the reference voltage, the error amplifier drives the PWM decreasing the duty cycle of the switching transistors, decreasing the output voltage. This process is repeated continuously to regulate the output voltage. The MAX766CPA+ also contains temperature protection circuitry that shuts down the output voltage if the internal die temperature exceeds a predetermined level. It has an enable pin that turns on the output voltage when high and turns off the output voltage when low. It also has a slow-start feature that gradually increases the output voltage from 0 to the final target voltage to reduce inrush current and minimize the output overshoot. The MAX766CPA+’s PWM frequency is adjustable for power optimization and noise reduction. It also has a low quiescent current that enables the device to operate effectively in battery-powered applications.

Conclusion

In conclusion, the MAX766CPA+ is an advanced DC-DC switching regulator from Linear Technology. The device is well suited for applications that requires dependable, low-noise power conversion and is a great choice for powering mobile phones, PDAs, digital cameras, and medical equipment that require regulated voltage over a wide range of supply conditions. Its high-frequency operation, adjustable PWM frequency, low quiescent current, thermal shutdown feature, and adjustable output voltage make it an ideal choice for DC-DC conversion and signal processing systems that require precision yields, high efficiency, and low noise power.

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