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Analog Devices ADP1055

Digital Controller for Power Supply Applications with PMBus Interface


TopologyBoost Converter
Switching frequency48-1000 kHz
IC revisionA


The ADP1055 is a flexible, feature-rich digital secondary side controller that targets ac-to-dc and isolated dc-to-dc secondary side applications. The ADP1055 is optimized for minimal component count, maximum flexibility, and minimum design time. Features include differential remote voltage sense, primary and secondary side current sense, pulse-width modulation (PWM) generation, frequency synchronization, redundant OVP, and current sharing. The control loop digital filter and compensation terms are integrated and can be programmed over the PMBus™ interface. Programmable protection features include overcurrent (OCP), overvoltage (OVP) limiting, undervoltage lockout (UVLO), and external overtemperature (OTP).

The built-in EEPROM provides extensive programming of the integrated loop filter, PWM signal timing, inrush current, and soft start timing and sequencing. Reliability is improved through a built-in checksum and programmable protection circuits.

A comprehensive GUI is provided for easy design of loop filter characteristics and programming of the safety features. The industry-standard PMBus provides access to the many moni-toring and system test functions. The ADP1055 is available in a 32-lead LFCSP and operates from a single 3.3 V supply.


−40°C to +125°C operation

  • PMBus Revision 1.2 compliant with PEC and extended manufacturer specific commands
  • 32-bit password protection with command masking
  • 64 address selections (16 base addresses, expandable to 64)
  • 6 PWM control signals, 625 ps resolution
  • Frequency from 48 kHz to 1 MHz
  • Duty cycle double update rate
  • Digital control loop (PID + additional pole or zero configurability)
  • Programmable loop filters (CCM, DCM, low/normal temperature)
  • Fast line voltage feedforward
  • Adaptive dead time compensation for improved efficiencyRemote voltage sense
  • Redundant programmable OVP
  • Current sense
  • Primary side cycle-by-cycle fast protection
  • Secondary side cycle-by-cycle fast overcurrent protection

-Secondary side averaged reverse current protection using diode emulation mode with fixed debounce

Synchronous rectifier control for improved efficiency

  • in light load mode
  • Nonlinear gain for faster transient response from DCM to CCM
  • Frequency synchronization
  • Soft start and soft stop functionality
  • Average and peak constant current mode
  • External PN junction temperature sensing
  • 4 GPIOs (2 GPIOs configurable as active clamp snubber PWMs)
  • Extended black box data recorder for fault recording
  • User trimming on input and output voltages and currents
  • Digital current sharing

Typical applications

  • Redundant power supply systems
  • Isolated dc-to-dc power supplies and modules


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