LTC3119MPFE

Voltage Regulators - DC DC Switching Regulators Overview

The LTC3119MPFE is a high-efficiency, 18V monolithic synchronous buck-boost DC/DC converter manufactured by Analog Devices. It delivers up to 5A of continuous output current and operates with an input voltage range from 2.5V to 18V. The device utilizes a proprietary four-switch PWM architecture to ensure seamless, low-noise operation regardless of whether the input voltage is higher than, equal to, or lower than the output voltage. Key electrical parameters include a programmable switching frequency between 400kHz and 2MHz, a maximum duty cycle of 95%, and a quiescent current of 50µA in active mode. It features a TSSOP-28 package and supports an operating temperature range from -55°C to +150°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Proprietary four-switch PWM architecture enables seamless transition between buck, boost, and bypass modes without noise spikes.
• Integrated power switches provide high efficiency and minimize total solution footprint for demanding applications.
• Supports external clock synchronization up to 2MHz for system-wide noise management.
• Includes comprehensive protection mechanisms such as output short-circuit protection and thermal overload shutdown.

Voltage Regulators - DC DC Switching Regulators Applications

• Power supplies requiring wide input voltage ranges
• Battery-powered products using single to four lithium cells
• RF power supply systems
• Solar cell chargers
• System backup power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix MPFE corresponds to the military-grade temperature rating (-55°C to +150°C) and TSSOP-28 package configuration. Confirm RoHS compliance status through official manufacturer documentation. Ensure compatibility with your board layout regarding the thermal pad requirements of the TSSOP-28 package. Cross-reference the datasheet revision date to verify any recent design changes or pinout adjustments before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when an application requires handling input voltages that fluctuate significantly above and below the desired output level. The integrated synchronous rectification reduces external component count compared to discrete solutions. Consider the thermal performance of the TSSOP-28 package relative to the expected load current and ambient temperature conditions. Evaluate the need for the extended military temperature range if the deployment environment exceeds standard industrial limits.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LTC3119 family of monolithic buck-boost converters designed for high-current applications. It shares architectural similarities with other members like the LTC3118 but offers higher current capability. The MPFE suffix indicates a specific grade and package variant within the broader Analog Devices PMIC portfolio, tailored for robust performance in challenging environments.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include other parts within the LTC3119 family such as the LTC3119EFE#PBF for industrial temperature grades. Verify pin-to-pin compatibility and thermal characteristics when considering alternatives from different manufacturers. Ensure that any replacement maintains the required 5A current capacity and 18V input tolerance.

Voltage Regulators - DC DC Switching Regulators FAQ

How does the LTC3119 handle transitions when input voltage equals output voltage?

The device uses a proprietary four-switch PWM architecture that allows for seamless, low-noise operation even when the input voltage is exactly equal to the output voltage, eliminating the need for complex mode switching logic.

What is the purpose of the Burst Mode operation in this converter?

Burst Mode operation is designed to improve light-load efficiency by reducing switching activity when the load current is low, thereby minimizing overall power consumption during standby or partial load conditions.