Features

• 8-Channel Independent Step-Down DC/DCs
• Master-Slave Configurable for Up to 4A Per Output Channel with a Single Inductor
• Independent V_IN Supply for Each DC/DC (2.25V to 5.5V)
• All DC/DCs Have 0.425V to VIN Output Voltage Range
• Precision Enable Pin Thresholds for Autonomous Sequencing (or I²C Control)
• 1MHz to 3MHz Programmable/Synchronizable Oscillator Frequency (2MHz Default)
• I²C Selectable Phasing (90° Steps) Per Channel
• Programmable Power-On Reset/Watch Dog/Pushbutton Timing
• Die Temperature Monitor Output
• 48-Lead (7mm × 7mm) QFN Package

Typical Application

Description

The LTC®3375 is a digitally programmable high efficiency multioutput power supply IC. The DC/DCs consist of eight synchronous buck converters (I_OUT up to 1A each) all powered from independent 2.25V to 5.5V input supplies.

DC/DC enables, output voltages, operating modes, and phasing may all be independently programmed over I²C or used in standalone mode via simple I/O with power-up defaults. The DC/DCs may be used independently or in parallel to achieve higher output currents of up to 4A per output with a shared inductor. Alarm levels for high die temperature may also be programmed via I²C with a maskable IRQ output for monitoring DC/DC and system faults.

Pushbutton ON/OFF/RESET control, power-on reset, and a watchdog timer provide flexible and reliable power-up sequencing and system monitoring. The LTC3375 is available in a low profile 48-lead 7mm × 7mm QFN package.