MAX1654EEE

Frequency - Switching:	150kHz, 300kHz
Base Part Number:	MAX1654
Supplier Device Package:	16-QSOP
Package / Case:	16-SSOP (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	98%
Series:	--
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 30 V
Output Phases:	1
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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MAX1654EEE Application Field and Working Principle

MAX1654EEE is a highly integrated, high efficiency, and monolithic switching regulator controller designed for use in mobile and portable applications. This device is part of the MAX1654EEE family of low-noise DC/DC switching regulators, and is capable of delivering up to 4A at 12V from a 4.2V to 28V input voltage. The MAX1654EEE has a built-in 150mV voltage reference, voltage feedback comparator, and high-impedance current sensing capabilities. It is easily adjustable using the external components and can be configured for a variety of applications.The MAX1654EEE is well suited for voltage conversions and powering systems in a wide range of applications such as 5V and 12V CPUs, chargers, telecom/data systems, and many other applications. It also provides protection against input overvoltage and severe short-circuiting, as well as featuring a programmable soft-start feature.

MAX1654EEE Application Field

The MAX1654EEE is designed for applications such as mobile phones, PDAs, smart cards, notebooks, and cameras that require regulated power supplies. It is also suitable for powering applications in automotive, aviation, and industrial control, and motor control systems. The MAX1654EEE can be used to convert a supply voltage to any output voltage between 3V and 24V. These supplies are also suitable for offline applications, where low cost and fast transient response are key factors in the design of a power supply.

MAX1654EEE Working Principle

The MAX1654EEE utilizes a pulse-width modulation (PWM) approach for voltage conversion, where the output voltage is determined by varying the width of the pulses supplied to the power MOSFETs. The device includes a Voltage Mode Control (VMC) loop and a Current Mode Control (CMC) loop. The VMC loop turns on the power MOSFETs when the voltage at the output is lower than the voltage at the reference, and turns off the MOSFETs when the output voltage is higher than the reference. This prevents excessive voltage regulation at low duty cycles and provides improved efficiency. The CMC loop is used to sense the output current, and is used to reduce the duty cycle of the output waveform when the output current exceeds the desired limit. The MAX1654EEE also provides low-noise operation and built-in monitoring and protection features, such as Soft Start, Under Voltage Lockout (UVLO), Over Temperature Protection (OTP), and Over Current Protection (OCP). Soft Start provides a slow start-up of the switching regulator, and prevents current surges during the start process. The UVLO feature prevents the output voltage from sinking too low during startup, and the OTP and OCP features will shut down the switching regulator if their respective thresholds are exceeded. The MAX1654EEE also includes Shut Down and Sleep Modes, which can be used to further increase power savings of the system.

Conclusion

The MAX1654EEE is an ideal solution for powering mobile devices, PDAs, and other applications requiring regulated power supplies. Its versatile design and powerful features, such as the Voltage Mode Control, Current Mode Control, and built-in monitoring and protection features make it an excellent choice for a broad range of applications.

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