High Accuracy 8-Channel Parallelable 1A Buck DC/DCs

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.

NOTES

LTC3374

LTC3374A

Higher efficiency, improved output voltage accuracy and an added overvoltage (OV) indicator

Applications

* General Purpose Multichannel Power Supplies

* Industrial/Automotive/Communications

* 8-Channel 1A Independent Step-Down DC/DCs

* Master-Slave Configurable for Up to 4A of Output Current with a Single Inductor

* Independent VIN Supplies for Each DC/DC (2.25V to 5.5V)

* All DC/DCs Have 0.8V to VIN Output Range

* ±1% VFB Accuracy, for Buck 1 (1A to 4A)

* ±1% PGOOD Accuracy* Precision Enable Pin Thresholds for Autonomous Sequencing