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Part Status:	Obsolete
Packaging:	Tube

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The MAX634CPA is an easy-to-use Pulse Width Modulation (PWM) based integrated switching regulator. It is specifically designed for synchronous buck-conversion applications. The device includes two high speed power switches, a low on-resistance gate driver and an oscillator. Most importantly, the integrated 14-bit DAC provides exceptionally smooth regulation with no external components, which simplifies design and eliminates the need for adjustments in many applications.The MAX634CPA is a cost-effective solution for applications such as high efficiency telecom power supplies and DC-DC buck converters, where excellent line voltage regulation and low noise are desired. The integrated linear feedback scheme allows excellent ripple rejection (50dB or better) across the entire range of line and load conditions.The basic principle of operation is fairly straightforward. The MAX634CPA starts operation when the device is powered up. When this happens, the integrated oscillator produces a PWM pulses which are fed to the power switches, turning them on and off to regulate the output voltage. The integrated linear feedback loop compares the feedback signal with a desired reference voltage and adjusts the duty cycle of the PWM pulses accordingly. The length of the PWM pulses is then adjusted such that the output voltage remains constant.The MAX634CPA has a number of operating characteristics that make it a particularly suitable choice for DC-DC buck-conversion applications in the telecom industry. First of all, the output current is limited by an internal current sensing circuit, which provides a safe and reliable operation even in cases of overload. Additionally, it allows for a range of output voltages from 0.44 to 12V, so it can easily be adapted to a wide range of input and output voltages. Plus, the integrated oscillator frequency can be adjusted by an external resistor or capacitor to help optimize system performance.The MAX634CPA also has an integrated over-temperature and under-voltage protection features, making it suitable for use in industrial and telecom applications. Moreover, its integrated low on-resistance power switches, along with its synchronous rectification, can reduce power losses and provide higher efficiency for the power supply design. The combination of these features makes the MAX634CPA an excellent choice for high efficiency, quiet and reliable switching regulator designs.

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