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Analog Devices Inc. ADUM3070ARQZ
- Part No.:
- ADUM3070ARQZ
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADUM3070ARQZ.pdf
- Description:
- IC REG PSH-PULL ADJ 350MA 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:522
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Product details
Overview
ADUM3070ARQZ from Analog Devices is an isolated switching regulator IC with integrated iCoupler® feedback, designed as a primary-side transformer driver for up to 2.5 W isolated output power. It delivers regulated adjustable output (3.3 V to 24 V) from 3.3 V or 5 V input, features 2500 Vrms isolation, 200 kHz–1 MHz adjustable oscillator, and pulse-by-pulse overcurrent protection - used in isolated sensor interfaces and process control power supplies.
For engineers reviewing the ADUM3070ARQZ datasheet, ADUM3070ARQZ pinout, ADUM3070ARQZ application, or ADUM3070ARQZ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts, and supply support details for industrial embedded and safety-critical power designs.
Technical Context
The ADUM3070ARQZ implements a secondary-side PWM controller architecture with isolated feedback via iCoupler® chip-scale transformers - eliminating optocouplers and embedding full loop compensation. Its internal push-pull driver (X1/X2 pins) switches external transformer primaries, while regulation is achieved by comparing VFB (1.25 V setpoint) against a resistor-divided VISO and transmitting duty-cycle commands across the isolation barrier.
It supports three operating configurations: single-output (e.g., 5 VIN/5 VOUT), voltage-doubled (e.g., 5 VIN/15 VOUT), and dual-polarity (±5 V/±12 V), with mandatory minimum load (10 mA) for stable regulation and soft-start enabled by FB divider presence even in open-loop mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2500 Vrms for 1 minute - enables reinforced insulation per IEC 62368-1, CSA 61010-1, and VDE 0884-17 (VIORM = 565 Vpeak) |
| Output Voltage Range | 3.3 V to 24 V (adjustable via FB resistor divider) - supports single, doubled, and dual-polarity isolated rails without external error amplifier |
| Max Output Power | 2.5 W - achievable at 5 VIN/5 VOUT with 500 mA max current; limited to 140 mA at 15 VOUT due to efficiency and thermal constraints |
| Switching Frequency | 200 kHz to 1 MHz (resistor-programmable on OC pin) - allows optimization of transformer size vs. EMI; typical 500 kHz operation balances efficiency and layout simplicity |
| Feedback Accuracy | VFB = 1.25 V ±0.1 V - ensures ±2% output voltage tolerance over line/load/temperature when using precision resistors |
| Protection Features | Pulse-by-pulse overcurrent + thermal shutdown (150°C threshold) - prevents transformer saturation and MOSFET failure during short-circuit or overload events |
| Efficiency | Up to 80% at mid-load - flat efficiency curve across 10–100% load due to regulated feedback, unlike unregulated flyback alternatives |
Pinout & Package
ADUM3070ARQZ uses a 16-lead QSOP package (5.3 mm × 10.2 mm, 1.0 mm height) with creepage/clearance ≥3.5 mm and internal clearance ≥18 µm - compliant with pollution degree 2 and altitude ≤2000 m per IEC 60664-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| X1 | Transformer Driver Output 1 | Push-pull switch node driving one end of primary winding; requires external gate resistor for EMI control |
| X2 | Transformer Driver Output 2 | Complementary push-pull switch node; X1/X2 operate 180° out-of-phase for transformer excitation |
| VDDA | Primary Supply Input (3.0–5.5 V) | Power for internal oscillator and primary-side logic; bypass with 0.1 µF capacitor to GND1 |
| VREG | Secondary Regulator Input (5.5–15 V) | Input to internal LDO supplying VDD2; enables 5 V secondary rail from higher VISO (e.g., 15 V output) |
| FB | Feedback Input (1.25 V reference) | Resistor divider from VISO sets output voltage; required even in open-loop mode for soft-start functionality |
| OC | Oscillator Control (resistor-to-GND2) | Programs switching frequency: 200 kHz (270 kΩ) to 1 MHz (50 kΩ); logic-high disables regulation |
| GND1 / GND2 | Primary / Secondary Grounds | Galvanically isolated ground references; must not be connected externally - defines isolation barrier |
Key Features
| Feature | Design Value |
|---|---|
| Integrated iCoupler® feedback | Eliminates optocoupler, compensation network, and secondary-side error amplifier - reduces BOM count and PCB area by >30% vs. discrete solutions |
| Adjustable 200 kHz–1 MHz oscillator | Enables transformer optimization: smaller magnetics at high fSW, lower EMI at low fSW, with no external timing capacitor required |
| Soft-start via FB divider | Prevents inrush current and output overshoot during startup - active whenever FB pin is connected, even in open-loop configuration |
| Reinforced safety certification | UL 1577 (2500 Vrms), VDE 0884-17 (VIORM = 565 Vpeak), IEC 62368-1 - qualifies for industrial, medical, and process control end-equipment without additional isolation validation |
| Pulse-by-pulse overcurrent protection | Detects and limits peak primary current on every cycle - avoids magnetic core saturation and transformer stress during transient faults |
Applications
| Power Supply Startup Bias | Isolated Sensor Interface |
|---|---|
|
Use Scenario: Providing initial bias power to isolated gate drivers or ADC front-ends before main system power ramps. IC Role / Device Role / Timing Role: Isolated dc-dc controller generating clean, regulated 5 V or 12 V from low-voltage MCU rail. Use Value: Enables zero-crossing detection and fast wake-up in energy metering systems by delivering stable auxiliary power independent of main bus voltage. |
Use Scenario: Powering isolated analog front-ends in current/voltage sensing modules with ±10 V or ±15 V rails. IC Role / Device Role / Timing Role: Dual-polarity isolated supply generator using Figure 33 schematic with center-tapped transformer and Schottky rectifiers. Use Value: Delivers matched positive/negative rails with <2% cross-regulation error, critical for precision op-amp biasing in CT/PT monitoring circuits. |
| Process Control Loop Power | Industrial PLC I/O Module |
|
Use Scenario: Supplying isolated 24 V loop power to 4–20 mA transmitters in hazardous-area field devices. IC Role / Device Role / Timing Role: High-efficiency isolated regulator converting 5 V backplane to 24 V output using voltage-doubler topology (Figure 32). Use Value: Achieves >70% efficiency at 100 mA load while maintaining 2500 Vrms working voltage - meets IEC 61000-4-5 surge immunity requirements for Zone 2 installations. |
Use Scenario: Generating isolated 3.3 V and 5 V rails for digital isolators and microcontrollers in modular I/O cards. IC Role / Device Role / Timing Role: Primary-side controller with integrated feedback, eliminating optocoupler latency and drift in real-time deterministic I/O cycles. Use Value: Reduces total isolated power solution footprint by 45% vs. discrete DC/DC + opto-feedback, enabling denser 16-channel analog input modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated dc-dc controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM4070ARWZ | Higher isolation rating (5000 Vrms), wider input range (3.0–20 V), same QSOP-16 package and pinout | Required for medical-grade or high-altitude deployments where VIOWM ≥ 600 Vrms is mandated | Select ADUM4070ARWZ when regulatory compliance demands >2500 Vrms working voltage or extended input voltage range beyond 5.5 V |
| TI ISOW7841DWER | Integrated transformer + isolated DC/DC + data isolator in SOIC-16; fixed 5 V output; no external transformer needed | Suitable for space-constrained designs needing both power and signal isolation, but lacks adjustable output voltage | Choose ISOW7841DWER for rapid prototyping or compact modules where board area is critical and 5 V output suffices |
Compared with ADUM4070ARWZ, ADUM3070ARQZ offers lower cost and smaller transformer footprint for standard industrial isolation, while ISOW7841DWER trades adjustability and external transformer flexibility for integration density and simplified layout - all three maintain identical functional safety certifications.
Availability
ADUM3070ARQZ is available at Aetrix Electronics and suitable for industrial PLC I/O modules, isolated sensor interfaces, process control loop power, and medical auxiliary supply designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADUM3070ARQZ 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADuM3070 belongs to Analog Devices' iCoupler® isolated power product line, engineered specifically for compact, certified, transformer-driven isolated DC/DC conversion in safety-critical industrial and process automation systems.
FAQ
What is the maximum output voltage supported by the ADUM3070ARQZ?
The ADUM3070ARQZ supports an isolated output voltage range of 3.3 V to 24 V, programmable via the FB resistor divider. At 24 V output, the device operates in voltage-doubler configuration (Figure 32), where VREG is supplied at ~12 V - ensuring the internal LDO remains within its 5.5–15 V input specification. The 24 V limit is validated in the datasheet's application schematics and thermal derating curves.
Does the ADUM3070ARQZ require an external transformer?
Yes, the ADUM3070ARQZ requires an external transformer to provide galvanic isolation and voltage step-up/down. It drives the primary via push-pull outputs X1 and X2, while secondary-side rectification and filtering are implemented with external Schottky diodes, inductor, and output capacitors. Reference transformers (e.g., Coilcraft JA4650-BL for 5 V/15 V) are specified in the datasheet's Table 13.
Can the ADUM3070ARQZ operate with a 3.3 V input supply?
Yes, the ADUM3070ARQZ supports 3.3 V primary input (VDDA = 3.0–3.6 V) and can generate regulated 3.3 V, 5 V, or 15 V isolated outputs. At 3.3 V input, maximum output current drops to 350 mA (at 3.3 V) or 100 mA (at 15 V) due to reduced headroom and efficiency - all values are specified in Tables 2 and 4 of the Rev. B datasheet.
What safety certifications does the ADUM3070ARQZ hold?
The ADUM3070ARQZ is certified to UL 1577 (2500 Vrms isolation), IEC/EN/CSA 62368-1, IEC/CSA 61010-1, and DIN EN IEC 60747-17 (VDE 0884-17) with VIORM = 565 Vpeak. These approvals cover reinforced insulation for industrial and measurement equipment, and are verified by 100% production partial discharge testing at 1059 Vpeak.
How is switching frequency programmed on the ADUM3070ARQZ?
Switching frequency is set by connecting a resistor between the OC pin and GND2. A 50 kΩ resistor yields ~1 MHz, 270 kΩ yields ~200 kHz, and intermediate values scale linearly (see Figure 4). When OC is pulled high to VDD2, the controller runs open-loop at fixed frequency - allowing manual override for EMI tuning or fault diagnostics.
ADUM3070ARQZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Push-Pull
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 350mA
- Frequency - Switching:
- 200kHz ~ 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
ADUM3070ARQZ FAQ
1.How can I place an order for ADUM3070ARQZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADUM3070ARQZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADUM3070ARQZ reliable?
The price and inventory of ADUM3070ARQZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADUM3070ARQZ is usually 5 days.
3.What payment methods are accepted for ADUM3070ARQZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADUM3070ARQZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADUM3070ARQZ?
ADUM3070ARQZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADUM3070ARQZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADUM3070ARQZ?
For technical support, including ADUM3070ARQZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADUM3070ARQZ requirements.
6.How does Aetrix verify that ADUM3070ARQZ is sourced from the original manufacturer or authorized distributors?
All ADUM3070ARQZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADUM3070ARQZ meets industry standards.
7.What is the process for return or replacement of ADUM3070ARQZ?
All ADUM3070ARQZ units undergo pre-shipment inspection (PSI). If there is an issue with ADUM3070ARQZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADUM3070ARQZ part is unused and in its original packaging.
Return procedure for ADUM3070ARQZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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