Renesas IW1791-02

Overview

The iW1791-02 from Renesas Electronics is an AC/DC primary-side rapid charge PWM controller supporting USB Power Delivery (USB PD) programmable power supply (PPS) and Qualcomm Quick Charge 2.0/3.0 protocols. It delivers 10mV DLNK voltage step resolution, multi-level constant voltage/current regulation without secondary feedback, and achieves <20mW no-load power consumption at 230VAC with 5V output. It operates in quasi-resonant mode and integrates source-charging VCC technology.

For engineers reviewing the iW1791-02 datasheet, iW1791-02 pinout, iW1791-02 application, or iW1791-02 equivalent, key selection criteria include its 10mV DLNK resolution for PPS compliance, primary-side CV/CC control architecture, SOIC-8 package compatibility, integrated fault protections (OVP, OCP, soft-short), and interoperability with Renesas DLNK-based secondary controllers like iW657P.

Technical Context

The iW1791-02 implements proprietary digital link (DLNK) communication over a single optocoupler to receive real-time voltage requests, current limits, undershoot detection, and over-voltage status from compatible secondary-side controllers. Its PrimAccurate™ technology enables primary-side regulation with tight ±1% CV and ±3% CC accuracy across 3–20V output ranges.

It uses source-charging VCC startup to eliminate external active start-up circuits and supports multi-mode PWM/PFM control with load-adaptive maximum constant frequency switching. The device features SmartDefender+™ for dynamic soft-short mitigation and EZ-EMI™ design for reduced EMI without added filtering components.

Key Specifications

Pinout & Package

Package: 8-Lead SOIC-8 (3.9mm × 4.9mm, 1.27mm pitch), RoHS-compliant, tape-and-reel (2500/reel).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar primary-side rapid charge controller applications.

Compared with MP6908A and UCC28780, the iW1791-02 provides fully integrated DLNK-based PPS execution, eliminates secondary feedback components, and delivers certified 10mV resolution without external processing-reducing BOM, layout area, and qualification effort for USB PD-compliant adapters.

Availability

iW1791-02 is available at Aetrix Electronics and suitable for USB PD PPS adapters, Qualcomm Quick Charge 3.0 wall chargers, and multi-protocol industrial charging systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for iW1791-02 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and SoC products for automotive, industrial, infrastructure, and IoT applications.

The iW1791-02 belongs to Renesas' Rapid Charge™ AC/DC controller family, engineered specifically for high-efficiency, low-noise, multi-protocol USB charging solutions with minimal external components and certified PPS compliance.

FAQ

What USB Power Delivery (PD) features does the iW1791-02 support?

The iW1791-02 supports full USB PD Programmable Power Supply (PPS) functionality with 10mV DLNK voltage step resolution, enabling precise 20mV output adjustments per command. It implements PPS voltage ranging from 3.3V to 21V and current control via bidirectional DLNK communication with Renesas secondary controllers such as iW657P. The iW1791-02 does not require a separate MCU or firmware to execute PPS sequences-protocol handling is embedded in hardware.

How does the iW1791-02 achieve <20mW no-load power consumption?

The iW1791-02 achieves <20mW no-load power consumption using source-charging VCC technology, which eliminates the external active start-up (ASU) circuit. During startup, internal circuitry charges the VCC capacitor directly from the SOURCE pin, bypassing traditional high-voltage resistive networks. This architecture, combined with ultra-low quiescent current design and multi-mode PFM operation, ensures compliance with DOE Level VI and EU CoC Tier 2 standards. The iW1791-02 maintains this performance at 230VAC with a typical 5V output configuration.

Which secondary-side controllers are compatible with the iW1791-02?

The iW1791-02 is designed exclusively for interoperability with Renesas' DLNK-enabled secondary-side controllers, including the iW657P (USB PD controller) and iW676 (synchronous rectifier controller). These devices use the proprietary digital link protocol over a single optocoupler to exchange voltage requests, current limits, OVP status, and undershoot detection data. The iW1791-02 does not support generic I²C or UART-based secondary interfaces-the DLNK protocol is mandatory for full feature operation.

Does the iW1791-02 require external loop compensation components?

No, the iW1791-02 eliminates the need for external loop compensation components due to its PrimAccurate™ primary-side regulation architecture. Stability is maintained across all operating conditions-including line, load, and temperature variations-using internal adaptive compensation tuned for quasi-resonant flyback topologies. This simplifies design, reduces BOM count, and improves time-to-market. The iW1791-02 achieves tight multi-level constant voltage and constant current regulation without any external RC networks or op-amps in the feedback path.

What protection features are integrated into the iW1791-02?

The iW1791-02 integrates comprehensive protection including output over-voltage (OVP), output over-current (OCP), soft-short and half-short detection via SmartDefender+™, auxiliary winding open-circuit protection, and thermal shutdown. All protections operate autonomously without external components: OVP triggers within 100ns, OCP uses cycle-by-cycle peak current limiting on ISENSE, and SmartDefender+™ modulates average output power during cable faults without latching. These features ensure robust operation in consumer and industrial charging applications. The iW1791-02 also meets JEDEC JESD22-A114 (±2000V HBM) and JESD78D latch-up standards.