MAX1847EEE+T

Frequency - Switching:	100kHz ~ 500kHz
Base Part Number:	MAX1847
Supplier Device Package:	16-QSOP
Package / Case:	16-SSOP (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Frequency Control
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	No
Duty Cycle (Max):	96%
Series:	--
Voltage - Supply (Vcc/Vdd):	3 V ~ 16.5 V
Output Phases:	1
Number of Outputs:	1
Topology:	Flyback
Output Configuration:	Negative
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The MAX1847EEE+T is a low-cost, high-performance, fixed-frequency synchronous buck/buck-boost controller and requires no external components for most applications. The device is designed for cost-sensitive, portable applications where low component count and small size are important.

Application Field

The MAX1847EEE+T can be used in a variety of applications such as battery-powered devices, portable powered products, digital still cameras and camcorders, personal audio and digital assistants, wireless communications and other handheld electronic devices.

Function Features

The MAX1847EEE+T features a unique integrated low-dropout (LDO) circuit which reduces power consumption and increases efficiency in many battery applications. The LDO provides a stable output voltage when the input voltage drops below the output regulation voltage. The device also features a low-current shutdown mode for increased system power savings. The MAX1847EEE+T also offers a low-resistance power MOSFET switch which lowers component cost and reduces wasted power. And the device\'s operating frequency is selectable, so users can decide what frequency is best suited for their application.

Working Principle

The MAX1847EEE+T works by comparing an internal reference voltage to the output voltage of the system. If the voltage is too high, then the controller shuts off the power MOSFET switch by driving its gate to a low voltage. This reduces the input voltage to the system and allows the output voltage to drop. If the voltage is too low, then the controller turns on the power MOSFET switch by driving its gate to a high voltage. This increases the input voltage to the system and allows the output voltage to rise. The MAX1847EEE+T also provides a soft-start circuit, which increases the output voltage in a controlled manner on startup to minimize any inrush current. The MAX1847EEE+T also features frequency dithering to reduce EMI noise. With frequency dithering, the frequency of the switching converter is varied randomly to spread the noise spectral content. This prevents the noise from being concentrated at certain frequencies, allowing the noise to pass limits set in various international standards.

Conclusion

The MAX1847EEE+T is a versatile and configurable device that is well suited for a wide range of applications. It is a highly efficient and cost-effective solution that offers superior power savings, low quiescent current, and a low-cost current-mode control. It is an ideal solution for cost-sensitive applications where low component count, small size, and high efficiency are important.

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