LT3437HFE#PBF

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The LT3437HFE#PBF is part of Linear Technology’s line of DC-DC switching regulators specifically designed for automotive applications. The LT3437HFE#PBF is a synchronous step-down converter designed to supply a wide range of voltage outputs at up to 3.2A with up to 95% efficiency. This device is compliant to AEC-Q100 and supports a wide input voltage range between 2.5-30V, making it suitable for transients found in automotive applications.

The LT3437HFE#PBF can be configured to operate in either current mode or as an RMS-On-Average, also known as average current mode, controlling converter which uses a low side series n-channel FET for output current sensing; this FET is included on the LT3437HFE#PBF. The LT3437HFE#PBF also supports two types of pulse-frequency modulation architectures—constant off-time (COT) and fixed frequency (FF). However, because COT mode significantly reduces peak inductor current and minimizes EMI while maintaining high efficiency, it is the more popular choice.

As with all linear technology devices, the LT3437HFE#PBF offers a complete protection suite to ensure the safety of the system. The device ensures protection against output overvoltage, input undervoltage, input overvoltage, output overcurrent and overtemperature. The LT3437HFE#PBF also has an adjustable foldback feature for output overcurrent protection which increases hysteretic current limit foldback and reduces sensitivity to inductor current sensing errors.

The LT3437HFE#PBF therefore is an ideal choice for high-efficiency, low-noise power conversion for automotive applications, featuring low quiescent current and automatic low power (Auto-LPMode) operation. Its extended temperature range from −40°C to +150°C and its built-in protections make it suitable for a wide range of automotive and industrial applications, such as battery management systems, auxiliary power supplies, and active power factor correction.

Working Principle

The LT3437HFE#PBF is an advanced synchronous step-down DC-DC converter featuring a patented high-voltage control architecture which integrates the PWM controller and low-side current-sense MOSFET into a single monolithic IC. The control loop is responsible for enabling and disabling the output switch at the proper times, while also providing frequency foldback, foldback current limit, current mode, and average current mode regulation.

An external feedback signal sets the output voltage of the LT3437HFE#PBF. This signal is compared with the derived output voltage present at the Power Good pin, and the error voltage is then passed through the voltage loop compensation network. The result is a signal control signal for the internal high-side and low-side switches. The high-side switch is controlled by an active PWM loop, and the low-side switch is used for current sensing. The LT3437HFE#PBF also provides an external synchronization pin for synchronization to an external clock or other asynchronous signal.

The LT3437HFE#PBF features an internal 5V low dropout voltage regulator, which is used to supply both the PWM comparator reference voltage and the high-side driver. The LDO is protected against output overcurrent, overvoltage, and overtemperature conditions.

Conclusion

The LT3437HFE#PBF is an advanced, high-efficiency, synchronous step-down DC-DC converter specifically designed for automotive applications. The device features a patented high-voltage control architecture and integrates the PWM controller and low-side current-sense MOSFET into a single monolithic IC. The LT3437HFE#PBF can deliver outputs up to 3.2A with efficiency up to 95%, and offers a complete protection suite for the system, including overvoltage, undervoltage, overcurrent and overtemperate protection. Furthermore, it supports two types of pulse-frequency modulation architectures - constant off-time and fixed frequency, with the former being the better choice for automotive applications. The wide input voltage range and extended temperature range make it suitable for a wide range of automotive and industrial applications.

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