MAX1840EUB

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Applications:	Smart Card
Interface:	MICROWIRE™, QSPI™, Serial, SPI™
Voltage - Supply:	1.4 V ~ 5.5 V, 1.7 V ~ 5.5 V
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Supplier Device Package:	10-uMAX
Mounting Type:	Surface Mount
Base Part Number:	MAX1840

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MAX1840EUA Application Field and Working Principle

Introduction

The MAX1840EUA is a Family of Universal Low-Voltage-Input Boost Controllers intended for driving external power MOSFETs used in buck-boost (step-up/step-down) and Cuk Converters, as well as flyback (buck-type) converters. This device family can deliver up to 1A peak from a low voltage input source. It is based on a proprietary control algorithm to adjust pulse-width modulation (PWM) duty cycle at fixed frequency, depending on the output voltage.The MAX1840EUA is included in the Interface - Specialized category, as it is a dedicated device for controlling power delivery to a load. Its specific application field is as a low-voltage-input boost controller for driving external MOSFETs in buck-boost, Cuk, and flyback converters. It is optimized for high-efficiency switching applications that require improved device Efficiency, enhanced load transient response and low EMI.

Features and Benefits

The MAX1840EUA offers several features that makes it particularly advantageous in its application field. These include fast switching speed, advanced thermal protection, and low ripple. The MAX1840EUA has a fast transient response, with a switching frequency up to 2MHz for most models, and a minimum off-time of 0.4μs, allowing for higher efficiency and better thermal performance. It also features an automatic frequency-jumping feature that helps reduce EMI.

Protection Features

In addition to the advanced features, the MAX1840EUA also offers protection features. These include a programmable soft-start function to reduce in-rush current, overvoltage and overcurrent protection, and thermal shutdown. The MAX1840EUA is designed with a precise overvoltage protection threshold that helps protect the device from potential damage due to an increase of input voltage. It also features precise overcurrent protection to prevent the device from overheating.

Applications

The MAX1840EUA is ideal for use in applications that require precise control over power delivery. It is well suited for a variety of applications, including portable electronic devices, adapters, battery chargers, and consumer power supplies.Due to its fast transient response, the MAX1840EUA is also suitable for automotive applications such as DC-DC converters and lighting power supplies.

Working Principle

The MAX1840EUA operates by sensing the voltage at the output of the converter and adjusting the output current by controlling the Pulse-Width Modulation (PWM) duty cycle. At a given voltage, the output current is inversely proportional to the switching frequency, which is why the MAX1840EUA features an adjustable frequency range to control the current delivery to the output. The device will sense the output voltage and adjust the PWM output accordingly. The high switching speed and built-in features such as soft-start, overvoltage and overcurrent protection, as well as frequency-scaling and automatic frequency-jumping, all help to provide improved efficiency in power delivery and ensure the device is operating at its optimum performance.

Conclusion

The MAX1840EUA is a versatile low-voltage booster controller that is well suited for a wide range of applications, including those in the automotive, portable electronics, adapters and consumer power supplies markets. Its features, including fast transient response, advanced thermal protection, precise overvoltage and overcurrent protection and an adjustable frequency range, make it an ideal choice for powering external power MOSFETs in buck-boost, Cuk, and flyback converters.

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