GENERAL DESCRIPTION

The ADP1051 is an advanced digital controller with a PMBusTM interface targeting high density, high efficiency dc-to-dc power conversion. This controller implements voltage mode control with high speed, input line feedforward for enhanced transient and improved noise performance. The ADP1051 has six programmable pulse-width modulation (PWM) outputs capable of controlling most high efficiency power supply topologies, with added control of synchronous rectification (SR). The device includes adaptive dead time compensation to improve efficiency over the load range, and programmable light load mode operation, combined with low power consumption, to reduce system standby power losses.

FEATURES

Versatile digital voltage mode controller

High speed input voltage feedforward control

6 pulse-width modulation (PWM) logic outputs with 625 ps resolution

Switching frequency: 49 kHz to 625 kHz

Frequency synchronization as master and slave device

Multiple energy saving modes

Adaptive dead time compensation for efficiency optimization

Low device power consumption: 100 mW typical

Direct parallel control for power supplies without OR’ing devices Accurate droop current share Pre-bias startup Reverse current protection Conditional overvoltage protection

Extensive fault detection and protection

PMBus compliant

Graphical user interface (GUI) for ease of programming

On-board EEPROM for programming and data storage

Available in a 24-lead, 4 mm × 4 mm LFCSP

−40°C to +125°C operating temperature

APPLICATIONS

High density isolated dc-to-dc power supplies Intermediate bus converters High availability parallel power systems

Server, storage, industrial, networking, and communications infrastructure