Preliminary Technical Data
Digital Controller for Isolated Power
Supply with PMBus Interface
Versatile, digital voltage mode controller
High speed, input voltage feed-forward control
6 PWM logic outputs with 625ps resolution
Switching frequency 50 kHz to 625 kHz
Frequency synchronization master & slave
Multiple energy saving modes
Adaptive dead-time compensation for efficiency
Low device power consumption - typical 100 mW
Direct Parallel operation
• Accurate droop current share
• Pre-bias start-up
• Reverse current protection
• Conditional over-voltage protection
Extensive fault detection and protections
Ultra compact package design 4*4mm 24-pin LFCSP
Easy to use programming via Graphic User Interface (GUI)
High reliability EEPROM for programming & data storage
-40 °C ~ 125 °C operation temperature
High density, Isolated DC/DC power supplies
• Intermediate bus converters
• High availability parallel power systems
Server, storage, industrial, networking, and communications
The ADP1051 is an advanced digital controller with PMBusTM
interface targeting high density, high efficiency DCDC power
conversion. This controller implements voltage mode control with
high speed, input line feed-forward for enhanced transient and
improved noise performance. The ADP1051 has 6 programmable
PWM outputs capable of controlling most high efficiency power
supply topologies with added control of synchronous rectification.
The device includes adaptive dead-time compensation to improve
the efficiency over the load range and programmable light load
mode operation combined with low device power consumption to
reduce system standby power losses.
The ADP1051 implements several features to enable a robust
system of parallel and redundant operation for customers that
require high availability or parallel connection. The device includes
master/slave synchronization, reverse current protection and pre-
bias start-up, accurate current sharing between power supplies and
conditional overvoltage techniques to identify and safely shutdown
an erroneous power supply in parallel operation mode.
The ADP1051 is based on flexible state machine architecture and is
register programmed using an intuitive, graphical-user interface.
The easy–to-use interface reduces design cycle time and results in a
robust, hardware coded system loaded into the built-in EEPROM.
The small size 4*4 mm LFCSP package makes the ADP1051 ideal
for ultra-compact, isolated DCDC power module or embedded
OVP VS+ VS-
RES ADD RTD VCORE PG/ALT# CTRL SDA SCL
Figure 1. Typical Application Circuit
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