Features

• 8-Channel Independent Step-Down DC/DCs
• Master-Slave Configurable for Up to 4A per Output Rail with a Single Inductor
• Independent V_IN Supplies for Each DC/DC (2.25V to 5.5V)
• All DC/DCs Have 0.8V to V_IN Output Range
• Precision Enable Pin Thresholds for Autonomous Sequencing
• 1MHz to 3MHz Programmable/Synchronizable Oscillator Frequency (2MHz Default)
• Die Temperature Monitor Output
• Thermally Enhanced 38-Lead QFN (5mm × 7mm) and TSSOP Packages

Typical Application

Description

The LTC®3374 is a high efficiency multioutput power supply IC. The DC/DCs consist of eight synchronous buck converters (1A each) all powered from independent 2.25V to 5.5V input supplies.

The DC/DCs may be used independently or in parallel to achieve higher currents of up to 4A per output with a shared inductor. The common buck switching frequency may be programmed with an external resistor, synchronized to an external oscillator, or set to a default internal 2MHz clock. The operating mode for all DC/DCs may be programmed via the MODE pin.

To reduce input noise the buck converters are phased in 90° steps. Precision enable pin thresholds provide reliable power-up sequencing. The LTC3374 is available in a compact 38-lead 5mm × 7mm QFN package as well as a 38-lead TSSOP package.