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Renesas IW3638-02
- Part No.:
- IW3638-02
- Manufacturer:
- Renesas
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IW3638-02.pdf
- Description:
- IC LED DRIVER CTRLR PWM 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,133
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Product details
Overview
The iW3638-02 from Renesas Electronics is a high-power, non-isolated buck LED driver IC optimized for constant-current LED regulation from DC supplies up to 30V. It delivers ±3% output current accuracy using PrimAccurate™ sensing, supports 1–100% PWM dimming via DIM1, and implements NTC-based thermal derating via the NTC/DIM2 pin. It targets commercial T8 fixtures and wireless-dimmable LED drivers requiring flicker-free operation.
For engineers reviewing the iW3638-02 datasheet, iW3638-02 pinout, iW3638-02 application, or iW3638-02 equivalent, key selection criteria include its SOIC-8 package, dual-dimming interface support (PWM + NTC), 90W output capability, soft-off light-off mode, and built-in single-point fault protection including output open/short, overvoltage, and input undervoltage detection.
Technical Context
The iW3638-02 operates as a secondary-stage buck controller with cycle-by-cycle peak current control enabled by ISENSE feedback and voltage-mode regulation via VSENSE. Its NTC/DIM2 pin is configured for external temperature sensing using an NTC thermistor, enabling automatic current derating under thermal stress without MCU intervention.
It integrates a high-current gate driver on the OUTPUT pin capable of driving external enhancement- or depletion-mode MOSFETs, and uses VIN for active start-up device control and bus voltage monitoring. The IC achieves stable loop performance without external compensation components due to internal adaptive control architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Non-isolated synchronous buck controller for constant-current LED loads |
| Output Current Accuracy | ±3% over line, load, and temperature - enables flicker-free lighting without calibration |
| Dimming Range | 1% to 100% PWM via DIM1 - supports wireless, MCU, and 0–10V interfaces |
| Thermal Interface | NTC-based derating via NTC/DIM2 pin - configures automatic current reduction at elevated temperatures |
| Max Output Power | ≥90W in SOIC-8 package - enables compact high-power LED driver designs |
| Fault Protections | Built-in output open/short, output overvoltage, input undervoltage, and overtemperature - eliminates need for discrete protection circuitry |
| Start-up & Standby | Active start-up via VIN; soft-off before light-off mode - maintains IC functionality with minimal standby power |
Pinout & Package
The iW3638-02 is housed in an 8-lead SOIC-8 package with standard 1.27 mm pitch and exposed pad for thermal dissipation. Pin 1 is marked with a dot; pin numbering follows counter-clockwise orientation from the dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NTC/DIM2 | Analog input / digital input | Configured for NTC thermistor connection to enable automatic thermal current derating |
| 2 - ISENSE | Analog current sense input | Provides real-time switch current feedback for cycle-by-cycle peak current limiting and startup configuration |
| 3 - GND | Power ground reference | Primary return path for internal logic, gate driver, and analog sensing circuits |
| 4 - OUTPUT | High-current gate driver output | Drives external MOSFET gate with sufficient current to support ≥90W output in SOIC-8 |
| 5 - VCC | IC power supply input | Accepts 7.5–30V DC; powers internal regulators, logic, and gate driver stages |
| 6 - VSENSE | Analog voltage sense input | Monitors LED string voltage for output regulation and serves as startup configuration pin |
| 7 - VIN | Bus voltage sense / start-up control | Detects input bus voltage level and controls active start-up devices (e.g., depletion FET) |
| 8 - DIM1 | Digital PWM dimming input | Accepts standard 100 Hz–20 kHz PWM signals for precise 1–100% LED brightness control |
Key Features
| Feature | Design Value |
|---|---|
| PrimAccurate™ sensing | Eliminates need for shunt resistor and direct current-sense amplifier - reduces BOM count and layout complexity |
| No external loop compensation | Maintains stability across full operating range (7.5–30V VCC, -40°C to +150°C) without external RC networks |
| Soft-off before light-off | Gradually ramps down LED current prior to shutdown - prevents abrupt light cutoff and improves user experience |
| Configurable dimming curve | Selectable linear or logarithmic response via multi-function pins - matches human eye perception or system control requirements |
| Single-point fault protection | Integrated detection for output open/short, overvoltage, undervoltage, and overtemperature - enhances system reliability without added ICs |
Applications
| Commercial T8 LED Fixtures | 0–10V Dimmable LED Drivers |
|---|---|
Use Scenario: Retrofitting fluorescent T8 tubes with LED equivalents in office and retail environments requiring smooth, flicker-free dimming. IC Role / Device Role / Timing Role: Secondary-stage buck controller regulating constant current to LED strings while accepting 0–10V analog dimming commands. Use Value: Enables compliance with ENERGY STAR and DLC standards via ±3% current regulation and seamless integration with legacy 0–10V wall controllers. | Use Scenario: Standalone LED driver modules for architectural lighting where analog dimming interface is mandated by building automation systems. IC Role / Device Role / Timing Role: Primary LED current regulator with dedicated DIM1 pin for PWM-to-analog conversion and NTC/DIM2 for thermal foldback. Use Value: Delivers 90W+ output in SOIC-8 with built-in 0–10V compatibility via iW339-series interface controllers - reduces system component count. |
| Wireless-Dimmable Smart Lighting | External LED Driver Modules |
Use Scenario: Integration into Bluetooth/Zigbee-enabled LED luminaires where MCU or wireless module provides PWM dimming signals. IC Role / Device Role / Timing Role: Constant-current buck driver accepting direct PWM input on DIM1 and supporting NTC-based thermal management for enclosed fixtures. Use Value: Eliminates need for external current-sense resistor and compensation network - simplifies PCB layout and improves thermal performance in space-constrained modules. | Use Scenario: External driver units mounted remotely from LED arrays in high-bay, streetlight, or industrial applications. IC Role / Device Role / Timing Role: High-efficiency step-down controller interfacing with flyback AC/DC front-end and driving high-current LED strings via external MOSFET. Use Value: Supports wide VCC range (7.5–30V) and fast dimming transient response - ensures stable operation across varying input conditions and rapid brightness changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP4651GQ | Requires external current-sense resistor and compensation network; no integrated NTC interface; ±5% current accuracy | Targeted at cost-sensitive, lower-power (<60W) LED drivers without thermal derating requirement | Choose MP4651GQ only if BOM cost is prioritized over thermal safety and accuracy |
| LM3409HV | Analog current-mode controller; requires external op-amp for dimming; no built-in soft-off or light-off mode; ±4% regulation | Suitable for industrial LED drivers needing high-voltage input (>40V) but lacking integrated dimming interface flexibility | Select LM3409HV when designing for >40V DC input or requiring discrete control loop tuning |
Compared with MP4651GQ and LM3409HV, the iW3638-02 delivers tighter current regulation (±3%), integrated NTC thermal management, and native PWM dimming - reducing design effort and improving reliability in commercial and smart lighting applications.
Availability
iW3638-02 is available at Aetrix Electronics and suitable for commercial LED fixtures, smart lighting systems, and external driver modules requiring stable component supply, thermal-aware dimming, and compact high-power density.
Supply support for iW3638-02 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 connectivity solutions for automotive, industrial, and IoT markets.
The iW3638-02 belongs to Renesas' intelligent LED driver product line, engineered specifically for high-efficiency, flicker-free, thermally robust secondary-stage LED regulation in commercial and smart lighting applications.
FAQ
What is the primary function of the iW3638-02 in an LED lighting system?
The iW3638-02 functions as a high-performance secondary-stage buck LED driver controller that regulates constant current to LED strings directly from a DC bus. It replaces traditional analog current regulators by integrating PrimAccurate™ sensing, eliminating external shunt resistors and compensation components. In every iW3638-02 implementation, it accepts input from an upstream AC/DC converter and delivers tightly regulated current with ±3% accuracy - critical for flicker-free illumination in commercial and smart lighting systems.
How does the NTC/DIM2 pin operate in the iW3638-02?
In the iW3638-02, the NTC/DIM2 pin is factory-configured for NTC thermistor interface, enabling automatic LED current derating based on fixture temperature. When an NTC is connected, the iW3638-02 continuously monitors resistance changes and scales output current downward as temperature rises - preventing thermal runaway without MCU involvement. This behavior is fixed for the iW3638-02 variant and differs from iW3638-01 (PWM) or iW3638-03 (analog), making the iW3638-02 uniquely suited for thermally constrained LED fixtures.
Does the iW3638-02 require external loop compensation components?
No, the iW3638-02 does not require external loop compensation components. Its internal adaptive control architecture ensures stable operation across the full specified range of input voltage (7.5–30V), output load, and temperature (-40°C to +150°C). This eliminates the need for external RC networks typically required in conventional current-mode buck controllers - simplifying design, reducing BOM count, and improving layout robustness. Every iW3638-02 deployment benefits from this integrated stability without manual tuning.
What protection features are integrated into the iW3638-02?
The iW3638-02 integrates five single-point fault protections: output open-circuit, output short-circuit, output overvoltage, input undervoltage, and overtemperature (via internal sensor or external NTC). These are implemented in hardware with immediate latch-off or auto-recovery behavior depending on fault type. Unlike discrete protection schemes, these features require no additional ICs or firmware - enhancing reliability in field-deployed LED drivers. All iW3638-02 units deliver this protection set as standard, regardless of application configuration.
Can the iW3638-02 support both PWM and analog dimming simultaneously?
No, the iW3638-02 supports only one primary dimming interface at a time: DIM1 is dedicated to PWM input, while NTC/DIM2 is configured exclusively for NTC-based thermal derating in this variant. It does not support simultaneous analog dimming (e.g., 0–10V) on NTC/DIM2 - that function is reserved for iW3638-03 and iW3638-31 variants. For systems requiring combined PWM + analog control, designers must use external signal conditioning or select a different variant; the iW3638-02's fixed NTC configuration ensures predictable thermal management in commercial lighting applications.
IW3638-02 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Flyback, Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 7.5V
- Voltage - Supply (Max):
- 30V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- LED Lighting
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
IW3638-02 FAQ
1.How can I place an order for IW3638-02 through Aetrix?
Please submit a Request for Quotation (RFQ) for IW3638-02 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 IW3638-02 reliable?
The price and inventory of IW3638-02 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IW3638-02 is usually 5 days.
3.What payment methods are accepted for IW3638-02?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IW3638-02 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IW3638-02?
IW3638-02 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IW3638-02 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 IW3638-02?
For technical support, including IW3638-02 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IW3638-02 requirements.
6.How does Aetrix verify that IW3638-02 is sourced from the original manufacturer or authorized distributors?
All IW3638-02 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 IW3638-02 meets industry standards.
7.What is the process for return or replacement of IW3638-02?
All IW3638-02 units undergo pre-shipment inspection (PSI). If there is an issue with IW3638-02, 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 IW3638-02 part is unused and in its original packaging.
Return procedure for IW3638-02:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IW3638-02 Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
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