Renesas IW676-32

Overview

The iW676-32 from Renesas Electronics is a digital synchronous rectifier (SR) controller with integrated MOSFET driver for discontinuous conduction mode (DCM) flyback converters. It replaces secondary-side rectifier diodes using lossless V_DS sensing, supports output voltages from 3V to 25V, features Active Voltage Positioning (AVP) with 11.2V under-voltage threshold, and enables ultra-low no-load power in compact AC/DC chargers.

For engineers reviewing the iW676-32 datasheet, iW676-32 pinout, iW676-32 application, or iW676-32 equivalent, key selection criteria include AVP-enabled dynamic load response, sub-3V Direct Charge capability, 100V drain-sensing tolerance, 6-pin SOT23 package constraints, and compatibility with primary-side controllers like iW1782/iW1602 in multi-level USB PD and QC3.0 designs.

Technical Context

The iW676-32 implements digital adaptive turn-off control to minimize deadtime without requiring an external Schottky diode, using lossless V_DS sensing across the synchronous MOSFET. Its internal pulse linear regulator (PLR) sustains operation down to sub-3V output during constant-current charging phases.

It integrates Active Voltage Positioning (AVP) on the DRAIN pin for fast transient detection at 11.2V under-voltage threshold, enabling rapid load-step response in multi-output adapters. The device senses up to 100V on the DRAIN pin and operates with VIN from –0.3V to 33V, supporting bias from system output without external clamping circuits in ≤12V multi-level applications.

Key Specifications

Pinout & Package

Package: 6-pin SOT23, JEDEC MO-178AA compliant, 1.6mm × 2.9mm body size, 0.95mm height, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous rectifier controller applications.

Compared with MP6908A and UCC24612-2, the iW676-32 delivers unique value through its factory-configured 11.2V AVP, integrated PLR for sub-3V operation, and zero-external-component transient response-enabling smaller, more efficient, and regulation-compliant multi-level adapters without layout or firmware changes.

Availability

iW676-32 is available at Aetrix Electronics and suitable for USB PD 3.0 multi-level adapters, Qualcomm® Quick Charge™ 3.0 chargers, Direct Charge systems, low-power IoT wall adapters, and compact media tablet power supplies requiring stable component supply and long-term lifecycle support.

Supply support for iW676-32 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 Corporation is a global semiconductor leader delivering trusted embedded design innovation, with expertise in microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and consumer markets.

The iW676-32 belongs to Renesas' Dialog-branded digital power conversion portfolio, designed specifically for high-efficiency, low-noise, and ultra-low-standby-power AC/DC adapters targeting USB-C, PD, and proprietary fast-charge ecosystems.

FAQ

What is the under-voltage threshold (VUV) configured for the iW676-32?

The iW676-32 has a factory-set under-voltage threshold of 11.2V, which activates its Active Voltage Positioning (AVP) function for fast transient response in higher-output-voltage modes such as 12V or 15V USB PD profiles. This value is fixed and non-adjustable, distinguishing it from variants like iW676-30 (4.75V VUV) and enabling optimized performance in multi-level adapter architectures without external components.

Does the iW676-32 support operation below 3V output, and how is this achieved?

Yes, the iW676-32 supports Direct Charge operation down to sub-3V output levels using its integrated pulse linear regulator (PLR), which maintains internal bias even when system output drops below 2.4V in constant-current mode. This capability is confirmed in the Product Summary and enables reliable SR control during final battery charging phases where conventional controllers would disable or misfire.

Can the iW676-32 replace the iW676-30 or iW676-30C in an existing design?

No-the iW676-32 is not a drop-in replacement for iW676-30 or iW676-30C due to its different under-voltage threshold (11.2V vs. 4.75V), which alters AVP activation behavior and transient response characteristics. System validation is required to confirm stability and performance across load steps, especially in 5V-dominated use cases where earlier variants were tuned.

What is the maximum drain voltage the iW676-32 can sense without external clamping?

The iW676-32 supports drain voltage sensing from –1.5V to 100V, allowing direct connection to SR MOSFET drains in multi-level output applications up to 12V without external clamping circuits. This specification is verified in the Absolute Maximum Ratings table and eliminates BOM cost and layout area associated with TVS or Zener protection networks.

Is the SOURCE pin of the iW676-32 internally grounded?

Yes-the iW676-32 is part of the "-3XC" family designation (per Ordering Information), meaning its SOURCE pin is internally connected to GND, simplifying PCB routing and removing the need for an external ground trace from that terminal. This configuration is explicitly noted in the Pin Description table and applies only to -3XC variants, not base -3X versions.