Features

• 8-Channel 1A Independent Step-Down DC/DCs
• Master-Slave Configurable for Up to 4A of Output Current with a Single Inductor
• Independent V_IN Supplies for Each DC/DC (2.25V to 5.5V)
• All DC/DCs Have 0.8V to VIN Output Range
• ±1% V_FB Accuracy, for Buck 1 (1A to 4A)
• ±1% PGOOD Accuracy
• Precision Enable Pin Thresholds for Autonomous Sequencing
• 1MHz to 3MHz Programmable/Synchronizable Oscillator Frequency (2MHz Default)
• Die Temperature Monitor Output
• Thermally Enhanced 38-Lead 5mm × 7mm QFN and TSSOP Packages
• Pin-Compatible with LTC3374

Typical Application

Description

The LTC3374A is a multioutput power supply IC consisting of eight synchronous 1A buck converters, all powered from independent 2.25V to 5.5V input supplies. An upgraded pin-compatible version of the LTC3374, the LTC3374A, has higher efficiency, improved output voltage accuracy and an added overvoltage (OV) indicator.

The DC/DCs may be used independently or in parallel to achieve higher output currents of up to 4A 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 simplify powerup sequencing. The LTC3374A is available in a 38-lead 5mm × 7mm QFN package as well as a 38-lead exposed pad TSSOP package.