ADP1031 Three-Channel, Isolated Micropower Management Unit with Seven Digital Isolators

Product Details

The ADP1031 is a high performance, isolated micropower management unit (PMU) that combines an isolated flyback dc-to-dc regulator, an inverting dc-to-dc regulator, and a buck dc-to-dc regulator, providing three isolated power rails. Additionally, the ADP1031 contains four, high speed, serial peripheral interface (SPI) isolation channels and three general-purpose isolators for channel to channel applications where low power dissipation and small solution size is required.

Operating over an input voltage range of +4.5 V to +60 V, the ADP1031 generates isolated output voltages of +6 V to +28 V (adjustable version) or+ 21 V and +24 V (fixed versions) for VOUT1, factory programmable voltages of +5.15 V, +5.0 V, or +3.3 V for VOUT2, and an adjustable output voltages of −24 V to −5 V for VOUT3.

By default, the ADP1031 flyback regulator operates at a 250 kHz switching frequency and the buck and inverting regulators operate at 125 kHz. All three regulators are phase shifted relative to each other to reduce electromagnetic interference (EMI). The ADP1031 can be driven by an external oscillator in the range of 350 kHz to 750 kHz to ease noise filtering in sensitive applications.

The digital isolators integrated in the ADP1031 use Analog Devices, Inc., iCoupler® chip scale transformer technology, optimized for low power and low radiated emissions.

The ADP1031 is available in a 9 mm × 7 mm, 41-lead LFCSP and is rated for a −40°C to +125°C operating junction temperature range.


  • Industrial automation and process control
  • Instrumentation and data acquisition systems
  • Data and power isolation

Features and Benefits

  • Wide input supply voltage range: 4.5 V to 60 V
  • Integrated flyback power switch
  • Generates isolated, independent bipolar outputs and factory programmable buck output
    • VOUT1: 21 V, 24 V or 6 V to 28 V
    • VOUT2: 5.15 V, 5.0 V, or 3.3 V
    • VOUT3: −24 V to −5 V
  • Uses a 1:1 ratio transformer for simplified transformer design
  • Peak current limiting and OVP for flyback, buck, and inverting regulators
  • Precision enable input and power-good output
  • Adjustable switching frequency via SYNC input
  • Internal compensation and soft start control per regulator
  • High speed, low propagation delay, SPI signal isolation channels
  • Three, 100 kbps general-purpose isolated data channels
  • 9 mm × 7 mm LFCSP form factor enables small overall solution size
  • −40°C to +125°C operating junction temperature range
  • Conforms to CISPR11 Class B radiated emission limits
  • Safety and regulatory approvals (pending)
    • UL recognition: 2500 V rms for 1 minute per UL 1577
    • CSA Component Acceptance Notice 5A
      • 300 V rms basic insulation between slave, master, and field power domains (IEC 61010-1, pending)
    • VDE certificate of conformity
      • DIN V VDE 0884-10 (VDE 0884-10):2006-12
      • VIORM = 565 VPEAK