Renesas IW636-02

Overview

The IW636-02 from Renesas Electronics is an AC/DC secondary-side controller IC supporting Qualcomm Quick Charge 3.0, implementing proprietary digital communication with primary-side controllers (e.g., iW1782), enabling multi-level VBUS output from 3.6V to 12V in 200mV steps, with D+/D− over-voltage protection and <10mW no-load power at 5V/2A.

For engineers reviewing the IW636-02 datasheet, IW636-02 pinout, IW636-02 application, or IW636-02 equivalent, key selection criteria include QC3.0 protocol compliance, SOT-23-6 package constraints, D+/D− OVP capability, DRV pin current drive (25mA), DIS pin fast-discharge support (600mA peak), and kCC coefficient configuration (0.5 for VBUS=3.6V–6.8V).

Technical Context

The IW636-02 operates as a USB interface controller on the secondary side of isolated AC/DC adapters, using bidirectional digital signaling via a single opto-coupler to coordinate voltage/current requests with primary-side controllers. It integrates D+/D− analog I/O for BC1.2 and QC handshake, with built-in LED driver on DRV pin and active discharge control on DIS pin.

Its architecture supports dynamic VBUS regulation across 43 discrete voltage levels (3.6V–12V @ 200mV step), implements proprietary cable fault detection via dual-layer OVP (secondary D+/D− soft-short protection + primary SmartDefender™ hiccup), and maintains <150µA cut-off current during 5V steady-state operation.

Key Specifications

Pinout & Package

The IW636-02 is housed in a 6-lead SOT-23 package with gull-wing leads, optimized for compact AC/DC adapter designs requiring secondary-side intelligence and minimal BOM count.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar secondary-side USB charging controller applications.

Compared with IW636-00 and IW636-04, the IW636-02 provides balanced kCC behavior across 3.6V–6.8V (0.5) and 7V–12V (constant power), making it optimal for general-purpose QC3.0 adapters targeting broad smartphone compatibility without sacrificing efficiency at mid-range voltages.

Availability

IW636-02 is available at Aetrix Electronics and suitable for rapid-charging AC/DC adapters, USB-C legacy converters, and QC2.0/QC3.0 hybrid chargers requiring stable component supply, consistent kCC coefficient calibration, and SOT-23-6 footprint compatibility.

Supply support for IW636-02 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 Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC products for automotive, industrial, infrastructure, and IoT applications.

The IW636-02 belongs to Renesas' Dialog-branded AC/DC secondary-side controller product line, designed specifically for high-efficiency, low-no-load-power USB charging adapters compliant with Qualcomm Quick Charge standards.

FAQ

What is the primary function of the IW636-02 in an AC/DC power adapter?

The IW636-02 serves as a secondary-side USB interface controller that manages Qualcomm Quick Charge 3.0 communication, regulates VBUS output from 3.6V to 12V in 200mV steps, and transmits feedback to the primary-side controller via a single opto-coupler. Its role in the IW636-02-based adapter is to enable rapid voltage transitions, enforce D+/D− over-voltage protection, and maintain <10mW no-load power consumption while ensuring full QC3.0 interoperability.

How does the kCC coefficient setting differ between IW636-02 and other IW636 variants?

The IW636-02 uses kCC = 0.5 for VBUS = 3.6V–6.8V and switches to constant maximum power mode for 7V–12V, distinguishing it from IW636-00 (0.5 up to 6V) and IW636-04 (0.422 up to 9V). This specific kCC profile in the IW636-02 ensures optimal current limiting across mid-range QC3.0 voltages, making the IW636-02 particularly suitable for adapters targeting broad smartphone compatibility without compromising efficiency at 7V–9V outputs.

Can the IW636-02 operate without a primary-side controller like iW1782?

No - the IW636-02 requires pairing with a compatible primary-side controller such as the iW1782 to form a complete closed-loop feedback system. The IW636-02 lacks internal PWM generation or gate drive capability; instead, it relies on digital communication via the DRV pin to instruct the primary controller on voltage/current targets. Using the IW636-02 without iW1782 or another supported primary controller renders the IW636-02 nonfunctional in a production AC/DC adapter.

What protection features does the IW636-02 provide on the USB D+ and D− lines?

The IW636-02 integrates proprietary D+/D− over-voltage protection to detect and respond to VBUS-induced soft shorts on USB data lines - a critical safeguard against cable damage and system instability. It monitors D+ and D− continuously, triggering protective action before destructive currents develop. This D+/D− OVP functionality is intrinsic to the IW636-02 silicon and operates independently of external components, differentiating the IW636-02 from generic USB controllers lacking integrated cable fault mitigation.

Is the IW636-02 pin-to-pin compatible with earlier Dialog secondary-side controllers?

Yes - the IW636-02 is pin-to-pin compatible with the iW626, sharing identical SOT-23-6 pinout, electrical characteristics, and functional interface. This allows direct replacement in existing iW626-based designs without PCB modification, while gaining enhanced QC3.0 support, improved no-load performance (<10mW vs. typical ~15mW), and updated D+/D− OVP firmware. Migration to IW636-02 preserves layout and bill-of-material integrity while upgrading protocol capability.