Analog Devices Inc. ADUM4070ARIZ

Overview

ADUM4070ARIZ from Analog Devices is an isolated switching regulator IC with integrated iCoupler® feedback, designed as a primary-side transformer driver for regulated 3.3 V–24 V isolated outputs up to 2.5 W from 3.3 V or 5 V inputs. It delivers 5000 V_rms isolation, 200 kHz–1 MHz adjustable switching frequency, and pulse-by-pulse overcurrent protection - used in isolated sensor interfaces and process control power supplies.

For engineers reviewing the ADUM4070ARIZ datasheet, ADUM4070ARIZ pinout, ADUM4070ARIZ application, or ADUM4070ARIZ equivalent, key selection criteria include its regulated PWM feedback architecture, SOIC-16 wide-body package with 8.3 mm creepage, VIORM = 849 V_peak, thermal shutdown at 150°C, and compatibility with external push-pull transformers for bias and gate drive generation.

Technical Context

The ADUM4070ARIZ implements a secondary-side controller with isolated PWM feedback via iCoupler chip-scale transformers, eliminating optocouplers and embedding full loop compensation. Its primary-side push-pull driver (X1/X2) switches at programmable frequencies (200 kHz–1 MHz), while the FB pin accepts a resistor divider to set output voltage from 3.3 V to 24 V using V_FB = 1.25 V reference.

It supports dual-input configurations: 3.3 V or 5 V on VDDA/VDD1, and 5.5–15 V on VREG to generate regulated VDD2 = 5.0 V. The device includes soft start, undervoltage lockout with hysteresis, and operates across −40°C to +105°C with 45°C/W θ_JA.

Key Specifications

Pinout & Package

ADUM4070ARIZ uses a 16-lead SOIC wide-body package (SOIC_W) with 8.3 mm creepage and gull-wing leads. Pin 1–8 form the primary side (input/control), pins 9–16 the secondary side (isolated output/control); internal isolation barrier separates the two domains.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated dc-dc controller applications.

Compared with ADUM4070ARIZ, ADUM4070CRIZ offers extended temperature capability without changing circuit design, while ISOW7841DWER trades configurability for integration-reducing component count but fixing output voltage and limiting transformer selection.

Availability

ADUM4070ARIZ is available at Aetrix Electronics and suitable for industrial process control, isolated sensor interfaces, medical equipment bias supplies, and gate drive auxiliary power requiring stable component supply, long-lifecycle support, and certified safety isolation.

Supply support for ADUM4070ARIZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and communications.

The ADuM4070 product line delivers isolated power control ICs with integrated iCoupler feedback, targeting applications demanding compact, reliable, and safety-certified auxiliary supplies in harsh electromagnetic environments.

FAQ

What is the maximum output voltage supported by the ADUM4070ARIZ?

The ADUM4070ARIZ supports an isolated output voltage range of 3.3 V to 24 V, set via an external resistor divider on the FB pin using the formula VISO = VFB × (R1 + R2)/R2, where VFB = 1.25 V typical. For outputs above 15 V, the voltage-doubling topology shown in Figure 32 of the datasheet must be used, with VREG limited to ≤15 V and VISO reaching up to 24 V. The ADUM4070ARIZ itself does not regulate beyond 15 V directly but enables it through external circuit configuration.

Does the ADUM4070ARIZ require an external transformer?

Yes, the ADUM4070ARIZ requires an external push-pull transformer connected to X1 and X2 pins to deliver isolated power. It does not integrate magnetics. Recommended transformers include Coilcraft CR7983-CL (1:2) for 5 V–5 V, CR7984-CL (1:3) for 5 V–15 V, and Halo TGSAD-590V8LF. Transformer turns ratio must satisfy NS/NP = (VISO + VD)/(VDD1_MIN × D × 2), with D = 0.30 typical duty cycle and VD ≤ 0.5 V Schottky drop.

How does the ADUM4070ARIZ achieve regulation without an optocoupler?

The ADUM4070ARIZ achieves regulation using Analog Devices' iCoupler® chip-scale transformer technology to transmit isolated PWM feedback from the secondary-side controller to the primary-side driver. The FB pin receives a voltage divider signal from VISO, which the secondary-side circuit converts into a digital PWM signal sent across the isolation barrier. This eliminates optocoupler aging, gain drift, and CTR dependency while embedding full loop compensation internally.

What safety certifications apply to the ADUM4070ARIZ?

The ADUM4070ARIZ carries UL 1577 recognition (5000 V_rms, 1 min), CSA certification to IEC 62368-1, IEC 61010-1, and IEC 60601-1 (2 MOPP), and VDE conformity to DIN V VDE V 0884-10:2006-12 (reinforced insulation, VIORM = 849 V_peak). These approvals cover industrial, test & measurement, and Class II medical applications requiring reinforced isolation and long-term insulation reliability.

Can the ADUM4070ARIZ operate with a 3.3 V input supply?

Yes, the ADUM4070ARIZ supports 3.3 V input on VDDA (primary supply) with corresponding 3.3 V isolated output (VISO). In this configuration, maximum output current is 350 mA (typical), efficiency reaches 68%, and quiescent current is 2–3.5 mA. The FB pin still uses the same 1.25 V reference, so the resistor divider equation VISO = 1.25 × (R1 + R2)/R2 applies unchanged for setting 3.3 V output.