Renesas IW3629-00

Overview

The IW3629-00 from Renesas Electronics is a two-stage, flickerless digital AC/DC LED driver IC for non-dimmable luminaires up to 120W, delivering >0.95 power factor, <10% THD, <5% 100/120Hz output current ripple, and <0.5s startup time. It integrates boost + flyback control with PrimAccurate™ primary-side regulation and Flickerless™ technology for high-efficiency, optocoupler-free constant-current LED driving in universal-input (90–277VAC) applications.

For engineers reviewing the IW3629-00 datasheet, IW3629-00 pinout, IW3629-00 application, or IW3629-00 equivalent, key selection criteria include its internal VIN/VCB sensing configuration, SOIC-14 package, quasi-resonant dual-stage topology, NTC-based thermal derating, and absence of secondary feedback components - all critical for compact, high-PF, low-flicker LED driver design.

Technical Context

The IW3629-00 implements a digitally controlled two-stage architecture: a valley-switched boost PFC stage followed by a quasi-resonant flyback CC regulator, both operating without optocouplers via PrimAccurate™ primary-side sensing. Its internal 15kΩ resistive dividers on VIN and VCB pins enable simplified universal-input sensing.

Flickerless™ digital algorithms suppress 100/120Hz current ripple to <5%, while active start-up and soft-start logic achieve <500ms time-to-90% LED current. Protection includes LED open/short, over-current, brown-out, over-voltage, and junction temperature derating via VT-pin NTC interface.

Key Specifications

Pinout & Package

The IW3629-00 is housed in a 14-lead SOIC package compliant with JEDEC MS12F, with exposed pad not present and thermal resistance ψJB = 45°C/W. Pin functions are validated per Renesas Rev. 1.2 Product Summary.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar two-stage LED driver applications.

Compared with MP4001GQ-Z and BP57728J, the IW3629-00 uniquely delivers integrated PFC + QR flyback, internal sensing, <5% ripple, and <500ms startup - making it the only option meeting IEC 61000-3-2 Class C and IEEE 1789 low-risk flicker requirements in a single SOIC-14 package.

Availability

IW3629-00 is available at Aetrix Electronics and suitable for street lighting, industrial high-bay, commercial downlight, and UV-C disinfection modules requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for IW3629-00 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 solutions for automotive, industrial, infrastructure, and IoT applications.

The IW3629-00 belongs to Renesas' Dialog-branded LED driver portfolio, designed specifically for high-efficiency, flicker-free, high-PF AC/DC LED drivers targeting commercial and industrial solid-state lighting systems.

FAQ

What is the key functional difference between IW3629-00 and IW3629-01?

The IW3629-00 integrates internal 15kΩ resistive dividers on VIN and VCB pins for universal AC line and boost output voltage sensing, eliminating external resistors. In contrast, the IW3629-01 requires external resistor networks on both pins for customizable sensing ratios. This makes the IW3629-00 ideal for simplified, cost-optimized designs where fixed sensing thresholds are acceptable, while the -01 variant supports flexible input/output voltage scaling. Both share identical pinout, protection features, and Flickerless™ performance.

Does IW3629-00 require an optocoupler for LED current regulation?

No, the IW3629-00 does not require an optocoupler. It uses Dialog's PrimAccurate™ primary-side sensing technology to derive output current and voltage information from the flyback transformer's auxiliary winding (FVSENSE pin) and primary current sense (FISENSE pin). This enables ±5% LED current regulation accuracy while reducing BOM count, improving reliability, and eliminating optocoupler aging-related drift - a core design advantage confirmed in the official Renesas Product Summary Rev. 1.2.

How does IW3629-00 achieve <5% output current ripple?

The IW3629-00 achieves <5% 100/120Hz output current ripple through its proprietary Flickerless™ digital control algorithm, which actively compensates for low-frequency input rectification ripple in real time. Unlike passive filtering approaches, this closed-loop digital correction operates independently of output capacitor size and works across full load (50–100%) and input (90–277VAC) ranges - a capability explicitly verified in the IW3629-00 datasheet and highlighted as a defining feature in its product summary.

What thermal protection mechanism does IW3629-00 implement?

The IW3629-00 implements programmable over-temperature derating via the VT pin, which accepts an NTC thermistor to monitor heatsink or PCB temperature. When the sensed voltage crosses a threshold, the IC gradually reduces LED current to prevent thermal runaway - a soft derating behavior distinct from abrupt shutdown. This feature is documented in Section 2 (Features) and Section 4 (Pin Description) of the Renesas IW3629 Product Summary Rev. 1.2, and requires no external logic or microcontroller intervention.

Is IW3629-00 compatible with hot-plug LED module configurations?

Yes, the IW3629-00 supports hot-plug LED module operation, as explicitly stated in Section 3 (Applications) of the Renesas Product Summary Rev. 1.2. Its fast yet smooth soft-start sequence - completing within <500ms - ensures stable LED current establishment even when modules are inserted during powered operation. This capability relies on coordinated boost and flyback stage startup, active inrush limiting, and robust open-circuit protection that prevents latch-up during transient connect/disconnect events.