The **LT3688** from **Linear Technology Corporation** is a dual 800mA, 36V input step-down switching regulator that integrates two power-on reset timers and a watchdog timer. This device is ideal for automotive and telecom applications where reliable performance and long battery life are essential. With an input voltage range of 3.8V to 36V, it can handle demanding conditions like load dump and cold crank scenarios.
Each of the two channels delivers up to 800mA of continuous current through internal 1.2A switches, with output voltages as low as 0.8V. The LT3688 uses **Burst Mode** operation to maintain a very low quiescent current of just 115µA, which helps extend battery life in always-on systems. The switching frequency is user-programmable between 350kHz and 2.2MHz, allowing designers to optimize efficiency while avoiding noise-sensitive bands.
The compact 4mm x 4mm QFN-24 (or thermally enhanced TSSOP-24) package makes this solution ideal for space-constrained designs. It includes high-efficiency 1.2A switches with integrated boost diodes, oscillators, and control logic, all on a single chip. Low ripple Burst Mode ensures stable output with less than 25mVP-P, even at low currents.
The LT3688 also features programmable undervoltage lockout, external synchronization, and enhanced short-circuit protection. Its watchdog timer monitors system activity, and the power-on reset timers offer independent configuration via external capacitors. If the output voltage drops by 10% or more, the open-collector RST signal will activate, ensuring system stability.
Pricing varies depending on temperature range and package type. The **LT3688EUF** and **LT3688EFE** are priced at $3.60 and $3.75 respectively, while the **LT3688IUF** and **LT3688IFE** cost $4.01 and $4.17. The **LT3688HFE**, designed for extended temperature ranges (-40°C to 150°C), is available at $4.42 per unit in 1,000-piece quantities.
This device is perfect for automotive ECUs, industrial control systems, and other applications requiring high reliability and efficient power management. Whether you're working on a vehicle’s ECU or a telecom infrastructure, the LT3688 offers a robust, flexible, and compact solution.
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