Three-Channel, Isolated Micropower

Management Unit with Seven Digital Isolators

Data Sheet

ADP1031

Rev. A

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FEATURES

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

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

APPLICATIONS

Industrial automation and process control

Instrumentation and data acquisition systems

Data and power isolation

GENERAL DESCRIPTION

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.

TYPICAL APPLICATION CIRCUIT

6V TO 28V

3.3V, 5V, 5.15V

–24V TO –5V

MVDD

2.3V TO 5.5V

C1

SVDD

1.8V TO 5.5V

ISOLATED GPIO

CHANNELS AND SPI

INTERFACE

ISOLATED GPIO

CHANNELS AND SPI

INTERFACE

Tx1

4.5V TO 60V

PGNDP

SW2

FB1

VOUT1

VOUT2

SYNC

SW3

FB3

PGNDP

VINP

SLEW

SWP

L1

VOUT3

GNDP

MGND

SGND1

MVDD

SGND2

SVDD1

EN

SVDD2

L2

D1

C4

R3

R2

SGND2

C3

ADP1031

1:1

PWRGD

R1

Figure 1.

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

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.

COMPANION PRODUCTS

Analog Output DAC: AD5758

Precision Data Acquisition Subsystem: AD7768-1

Additional companion products on the ADP1031 product page