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Renesas IW3638-02A
- Part No.:
- IW3638-02A
- Manufacturer:
- Renesas
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IW3638-02A.pdf
- Description:
- HIGH-POWER STEP-DOWN LED DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:2,941
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Product details
Overview
iW3638-02A 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 without external voltage/current feedback components or loop compensation, supports 1–100% PWM dimming via dual interfaces (DIM1 and NTC/DIM2), and operates in an SOIC-8 package with integrated over-temperature, open-circuit, over-voltage, short-circuit, and under-voltage protections.
For engineers reviewing the iW3638-02A datasheet, iW3638-02A pinout, iW3638-02A application, or iW3638-02A equivalent, key selection considerations include its NTC-based thermal derating configuration, 0ms light-off delay, PrimAccurate™ sensing architecture, and compatibility with wireless, 0–10V, and 3-in-1 dimming systems in commercial T8 and fixture-integrated lighting.
Technical Context
The iW3638-02A implements cycle-by-cycle peak current control using ISENSE for switch current sensing and VSENSE for output voltage monitoring, enabling stable buck regulation without external compensation. Its dual-dimming architecture separates primary PWM control (DIM1) from secondary configuration (NTC/DIM2), where the -02A variant configures NTC-based temperature sensing with zero-delay light-off activation.
It integrates soft-start, soft-off, single-point fault protection (output open/short, OVP, UVLO), and supports active start-up using depletion-mode or enhancement-mode FETs. The IC operates across –40°C to +150°C junction temperature with 170°C/W θJA and requires no external feedback resistors or compensation network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 7.5V to 30V - powers internal circuitry directly from post-regulated DC bus without LDO overhead |
| Output Current Accuracy | ±3% - achieved via PrimAccurate™ sensing, eliminating need for shunt resistor calibration |
| Dimming Range | 1% to 100% - full-range PWM dimming with configurable minimum level (dim-to-off, 1%, 5%, or 10%) |
| Light-off Delay | 0 ms - immediate transition to low-power light-off mode upon DIM1 deactivation |
| Thermal Sensing | NTC interface on Pin 1 - enables real-time LED thermal derating without external ADC or microcontroller |
| Fault Protections | Integrated OVP, UVLO, output open/short, OTP - reduces BOM count and improves system reliability |
| Package | SOIC-8 - supports up to 90W output power with standard PCB layout and thermal relief design |
Pinout & Package
Package: 8-lead SOIC-8, surface-mount, RoHS-compliant, with exposed pad for thermal enhancement (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NTC/DIM2 | Multi-function analog/digital input | Configured as NTC interface for thermal derating; no external biasing required; enables automatic current reduction at elevated temperatures |
| 2 - ISENSE | Current sense input | Connects to source of external MOSFET for cycle-by-cycle peak current limiting and startup configuration |
| 3 - GND | Power ground | Reference node for all analog and digital circuitry; must be low-impedance connection to minimize noise coupling |
| 4 - OUTPUT | High-side gate driver output | Drives external N-channel MOSFET gate; capable of fast switching with integrated drive strength suitable for >90W operation |
| 5 - VCC | IC power supply | Accepts 7.5–30V DC; powers internal regulators and logic; bypass capacitor required per layout guidelines |
| 6 - VSENSE | Voltage sense input | Monitors LED string voltage for regulation and fault detection; used during startup to configure operating mode |
| 7 - VIN | Input bus sense/start-up control | Detects input rail presence and controls active start-up devices (e.g., depletion-FET); enables reliable cold-start behavior |
| 8 - DIM1 | PWM dimming input | Accepts 0–7V logic-level PWM signal; triggers immediate dimming response with fast transient recovery |
Key Features
| Feature | Design Value |
|---|---|
| PrimAccurate™ sensing | Eliminates external current-sense resistor and voltage-divider feedback network, reducing component count and board space |
| Dual dimming interface | Independent DIM1 (primary PWM) and NTC/DIM2 (secondary thermal or analog dimming) enable multi-source control without external logic |
| 0 ms light-off delay | Instantaneous shutdown sequence minimizes residual glow in architectural and retail lighting applications requiring precise timing |
| Single-point fault protection | On-chip detection and latch-off for output open, short, over-voltage, under-voltage, and over-temperature - no external supervisor IC needed |
| Configurable dimming curve | Linear or logarithmic transfer function selectable via startup pin strapping, matching human eye perception in dimming applications |
Applications
| 0–10V Dimmable LED Drivers | Commercial T8 LED Fixtures |
|---|---|
Use Scenario: Retrofitting legacy fluorescent T8 ballasts with digitally controllable LED drivers in office and retail spaces. IC Role / Device Role / Timing Role: Primary buck controller regulating constant current to LED strings while accepting 0–10V analog dimming signals via iW339-series interface. Use Value: Enables flicker-free dimming down to 1% with ±3% current accuracy and built-in thermal foldback via NTC/DIM2 pin. | Use Scenario: Integrated LED tube drivers requiring compact form factor, high efficiency, and compliance with DLC and Energy Star standards. IC Role / Device Role / Timing Role: Second-stage buck regulator post-regulating from flyback AC/DC stage; provides tight current regulation without optical feedback. Use Value: SOIC-8 footprint supports >90W output in thermally constrained T8 envelopes; soft-off eliminates afterglow during rapid on/off cycling. |
| Wireless Smart Lighting Systems | Industrial Fixture-Integrated Drivers |
Use Scenario: Bluetooth/Zigbee-enabled luminaires where MCU or wireless module drives PWM dimming directly. IC Role / Device Role / Timing Role: LED current controller interfacing with wireless SoC's GPIO; DIM1 accepts direct PWM, NTC/DIM2 enables local thermal override. Use Value: Fast dimming transient response (<100 µs) ensures smooth brightness transitions; 0 ms light-off prevents ghosting in motion-triggered lighting. | Use Scenario: High-bay and parking garage fixtures exposed to wide ambient temperature swings and vibration. IC Role / Device Role / Timing Role: Robust LED driver with integrated NTC-based thermal management and single-point fault protection for unattended operation. Use Value: Eliminates need for external temperature sensor and protection IC; operates reliably from –40°C to +150°C junction temperature. |
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 | Lacks integrated NTC interface; requires external thermistor conditioning and comparator circuit for thermal foldback | No native support for 0 ms light-off or configurable dimming curves; limited to fixed 1–100% linear dimming | Choose MP4651GQ only if thermal derating is handled externally and SOIC-8 thermal performance is not critical |
| LM3409HV | Analog-only dimming interface (no dedicated PWM pin); no built-in soft-off or light-off mode; requires external compensation | Designed for automotive LED headlight applications; lacks integrated fault protection for open/short LED conditions | Select LM3409HV when operating above 30V input or requiring AEC-Q100 qualification; not suitable for flicker-sensitive indoor lighting |
Compared with MP4651GQ and LM3409HV, the iW3638-02A uniquely integrates NTC-based thermal management, 0 ms light-off, and dual-dimming flexibility in SOIC-8-enabling simpler, more reliable designs for commercial and smart lighting where flicker, thermal safety, and fast dimming response are critical.
Availability
iW3638-02A is available at Aetrix Electronics and suitable for commercial LED retrofitting, smart lighting systems, and industrial fixture-integrated drivers requiring stable component supply, consistent thermal derating behavior, and zero-delay light-off functionality.
Supply support for iW3638-02A 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 trusted embedded solutions, including microcontrollers, analog, power management, and timing devices for industrial, automotive, and IoT markets.
The iW3638-02A belongs to Renesas' Intelligent LED Driver family, designed specifically for high-efficiency, flicker-free, thermally adaptive constant-current LED regulation in commercial and smart lighting applications.
FAQ
What is the primary function of the NTC/DIM2 pin on the iW3638-02A?
The NTC/DIM2 pin (Pin 1) on the iW3638-02A is configured exclusively for NTC-based thermal sensing in this variant. It enables automatic LED current derating in response to rising temperature without external circuitry. Unlike other iW3638 variants, the -02A version disables PWM and analog dimming functions on this pin, dedicating it solely to NTC interface with internal biasing and threshold detection - a key differentiator for thermally demanding fixture applications.
How does the iW3638-02A achieve ±3% output current accuracy without external sense resistors?
The iW3638-02A achieves ±3% output current accuracy using Renesas' PrimAccurate™ technology, which performs direct sensing of MOSFET RDS(on) voltage drop and dynamically compensates for temperature and process variation. This eliminates the need for a precision external current-sense resistor and associated signal conditioning, reducing BOM cost and layout sensitivity while maintaining regulation accuracy across line, load, and temperature.
Does the iW3638-02A require external loop compensation components?
No, the iW3638-02A does not require external loop compensation components. Its internal control architecture embeds adaptive compensation that maintains stability across all operating conditions - including full input voltage range (7.5–30V), output current loads, and temperature extremes. This simplifies design, reduces PCB area, and eliminates tuning effort typically required for traditional current-mode buck controllers.
What is the significance of the "0 ms light-off delay" specified for the iW3638-02A?
"0 ms light-off delay" means the iW3638-02A initiates its soft-off sequence immediately upon removal of the DIM1 PWM signal - with no intentional hold-off time. This enables instantaneous termination of LED current, preventing residual glow or ghosting in applications like motion-sensor lighting, theatrical cues, or retail accent lighting where precise temporal control is essential. The feature is factory-configured and cannot be adjusted.
Can the iW3638-02A be used with both depletion-mode and enhancement-mode FETs for active start-up?
Yes, the iW3638-02A supports both depletion-mode and enhancement-mode FETs for active start-up via the VIN pin (Pin 7). The IC detects input bus presence and drives the external FET accordingly - enabling reliable cold-start behavior even with low-input-voltage conditions. Reference schematics in the product summary confirm implementation with either FET type, and no external gate driver is required.
IW3638-02A 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:
- 30V
- 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
IW3638-02A FAQ
1.How can I place an order for IW3638-02A through Aetrix?
Please submit a Request for Quotation (RFQ) for IW3638-02A 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 IW3638-02A reliable?
The price and inventory of IW3638-02A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IW3638-02A is usually 5 days.
3.What payment methods are accepted for IW3638-02A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IW3638-02A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IW3638-02A?
IW3638-02A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IW3638-02A 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 IW3638-02A?
For technical support, including IW3638-02A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IW3638-02A requirements.
6.How does Aetrix verify that IW3638-02A is sourced from the original manufacturer or authorized distributors?
All IW3638-02A 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 IW3638-02A meets industry standards.
7.What is the process for return or replacement of IW3638-02A?
All IW3638-02A units undergo pre-shipment inspection (PSI). If there is an issue with IW3638-02A, 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 IW3638-02A part is unused and in its original packaging.
Return procedure for IW3638-02A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IW3638-02A Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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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
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BCR421UFD-7
Diodes Incorporated
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