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Renesas IW380-31B
- Part No.:
- IW380-31B
- Manufacturer:
- Renesas
- Category:
- LED Drivers
- Package:
- 10-SOP (0.154", 3.90mm Width)
- Datasheet:
-
IW380-31B.pdf
- Description:
- HIGH-PERFORMANCE STEP-DOWN DC/DC
- Quantity:
- Payment:
- Shipping:
Inventory:4,783
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Product details
Overview
The IW380-31B from Renesas Electronics is a high-performance step-down DC/DC controller optimized for LED lighting drivers in CP/CC (constant-power/constant-current) mode with 70% fixed CP setpoint. It supports input voltages up to 78V, delivers true DC dimming from 0.0625% to 100% with 0.0625% resolution, and regulates LED current with <±3% line/load regulation in high-side buck topology.
For engineers reviewing the IW380-31B datasheet, IW380-31B pinout, IW380-31B application, or IW380-31B equivalent, this controller's dual-dimming architecture, configurable startup voltage, light-off mode (<1mA quiescent), and integrated protections-including OVP, OSP, OCP, OTP, and sense-resistor short detection-are critical for robust, flicker-free dimming in industrial and architectural LED systems.
Technical Context
The IW380-31B implements digital control over a high-side synchronous buck topology, supporting CP/CC operation where constant power is maintained at 70% of nominal output power until current limiting engages. Its dual analog-dimming inputs (DIM1, DIM2) multiply digitally to determine final current setpoint (DIM1% × DIM2%), enabling precise multi-level dimming without external logic.
Internal protection circuitry includes programmable overtemperature current de-rating, configurable minimum startup voltage to suppress turn-off flicker, and auto-detection of 3-in-1 dimming signal types (resistor, PWM, analog voltage) on both DIM pins-each with user-configurable hysteresis for noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 22V to 78V DC - supports wide-range industrial and commercial AC/DC front-end outputs |
| Dimming Range & Resolution | 0.0625%–100% with 0.0625% resolution - enables ultra-low-level lighting control without PWM artifacts |
| Operating Mode | CP/CC with fixed 70% CP setpoint - maintains stable power delivery during dimming transitions before CC takeover |
| Current Regulation Accuracy | <±3% CC line/load regulation - ensures consistent LED brightness across input and load variations |
| Light-Off Quiescent Current | <1mA - minimizes standby power while retaining fast wake-up response to dimming signals |
| Protection Features | OVP, OSP, VVIN UV/OV, OCP, sense-resistor short, OTP - comprehensive fault coverage for unattended LED installations |
| Startup Voltage Configurability | User-selectable minimum VIN threshold - prevents flash/flicker during brown-out or power-cycle events |
Pinout & Package
Package: 10-lead SOIC (Small Outline Integrated Circuit), surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input & Sensing | Primary DC input supply connection and input voltage monitoring node |
| VCC | Bias Supply | Internal LDO input; powers internal circuitry from bootstrap or auxiliary source |
| DIM1, DIM2 | Analog Dimming Inputs | Dual independent dimming ports supporting resistor, PWM, or analog voltage; product determines final current setpoint |
| GND | Ground Reference | Common return path for analog and power sections; critical for current-sense accuracy |
| ISNS | Current Sense Input | Connects to low-side sense resistor; enables accurate LED current regulation |
| CFG | Configuration Input | Analog pin setting startup voltage threshold and dimming hysteresis |
| LX | Switch Node | Connection to high-side MOSFET source; defines switching waveform and timing reference |
| HSG | High-Side Gate Driver Output | Drives gate of external N-channel MOSFET in high-side buck configuration |
| BOOT | Bootstrap Supply | Provides floating voltage for HSG driver; requires external bootstrap capacitor |
Key Features
| Feature | Design Value |
|---|---|
| True DC Dimming Architecture | Digital multiplication of two independently sensed dimming inputs (DIM1 × DIM2) enables linear, artifact-free dimming down to 0.0625% |
| Configurable Light-Off Mode | Enters ultra-low-power state (<1mA) when dimming signal falls below threshold, yet monitors inputs for immediate wake-up |
| 3-in-1 Auto-Detect Dimming | Each DIM pin automatically identifies resistor, PWM, or analog voltage input type-eliminating external configuration components |
| Programmable Startup Voltage | CFG pin sets minimum VIN required for startup, preventing erratic behavior during marginal input conditions |
| Integrated Protection Suite | Hardware-enforced OVP, OSP, OCP, OTP, and sense-resistor short detection ensure fail-safe operation in field-deployed lighting |
Applications
| Architectural LED Wall Washers | Industrial High-Bay Lighting |
|---|---|
Use Scenario: Precise, continuous dimming in large-format wall wash fixtures requiring smooth transitions from full brightness to near-darkness. IC Role / Device Role / Timing Role: IW380-31B operates as the primary constant-power/constant-current buck controller, regulating LED string current while maintaining 70% CP setpoint under varying thermal and input conditions. Use Value: Enables flicker-free dimming to 0.0625% with guaranteed linearity-critical for museum-grade and hospitality lighting where visual comfort is paramount. | Use Scenario: High-reliability LED drivers in factory environments with wide input voltage swings and frequent power cycling. IC Role / Device Role / Timing Role: IW380-31B serves as the secondary-stage DC/DC controller in two-stage AC/DC architecture, interfacing with PFC front-end and managing LED current with robust fault handling. Use Value: Built-in OVP, OSP, and OTP protections plus configurable startup voltage prevent nuisance tripping and lamp flash during brown-outs-reducing maintenance in harsh settings. |
| Commercial Tunable White Fixtures | Outdoor LED Streetlight Drivers |
Use Scenario: Dual-channel tunable white systems where independent dimming of warm and cool LEDs must track precisely across full range. IC Role / Device Role / Timing Role: IW380-31B controls one LED channel in CP/CC mode, using DIM1/DIM2 to coordinate with master controller for correlated color temperature (CCT) tuning. Use Value: Dual-dimming input architecture allows synchronized scaling of multiple channels without external microcontroller intervention-simplifying system BOM and firmware. | Use Scenario: Outdoor streetlights operating from 48V–72V DC battery or PoE-powered infrastructure with strict thermal management requirements. IC Role / Device Role / Timing Role: IW380-31B functions as the isolated DC/DC LED driver controller, delivering stable current while dynamically adjusting for ambient temperature via OTP de-rating. Use Value: Overtemperature current de-rating and <1mA light-off mode extend LED lifetime and reduce energy waste during nighttime low-load operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409HV | Fixed-frequency current-mode controller; no true DC dimming; max dimming 10:1 (10%) with external PWM | Requires external PWM generator and op-amp dimming interface; lacks auto-detect 3-in-1 dimming | Preferred where cost sensitivity outweighs dimming resolution and integration level |
| UCC28810 | PSR flyback controller with analog dimming only; no CP/CC mode; no dual-dimming architecture | Designed for single-stage AC/DC; not suitable for high-voltage DC/DC buck stage | Applicable only in low-power, single-stage LED drivers where isolation is mandatory |
Compared with LM3409HV and UCC28810, the IW380-31B uniquely delivers 16,000:1 true DC dimming in CP/CC mode with dual auto-detect dimming inputs and integrated protections-making it optimal for high-fidelity, high-reliability LED drivers where precision dimming and thermal resilience are non-negotiable.
Availability
IW380-31B is available at Aetrix Electronics and suitable for architectural lighting, industrial high-bay systems, and outdoor streetlight drivers requiring stable component supply, long-term lifecycle support, and consistent dimming performance across production batches.
Supply support for IW380-31B 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, and IoT applications.
The IW380 family is designed specifically for high-performance, digitally controlled LED lighting drivers-emphasizing ultra-fine dimming resolution, multi-signal compatibility, and robust protection in demanding commercial and industrial environments.
FAQ
What is the operating mode configured for IW380-31B?
The IW380-31B is factory-configured for CP/CC (constant-power/constant-current) operation with a fixed 70% constant-power setpoint. When input power permits, it regulates output power to 70% of nominal; once LED forward voltage rises or current demand increases, it seamlessly transitions to constant-current regulation-ensuring stable light output across thermal and electrical variations.
Does IW380-31B support both analog and PWM dimming simultaneously?
Yes, the IW380-31B supports simultaneous analog and PWM dimming through its dual-dimming architecture: DIM1 and DIM2 each auto-detect signal type (resistor, analog voltage, or PWM duty cycle), then digitally multiply their interpreted percentages to determine final LED current. This eliminates external signal conditioning and enables flexible, multi-source dimming control in a single IW380-31B device.
What protection features are integrated into IW380-31B?
The IW380-31B integrates hardware-based protections including output overvoltage (OVP), output short-circuit (OSP), VVIN over/under voltage, overcurrent (OCP), sense-resistor short detection, and overtemperature (OTP) with configurable de-rating. These operate autonomously without firmware, ensuring fail-safe shutdown or graceful derating during fault conditions-critical for unattended LED lighting deployments.
How does IW380-31B achieve flicker-free dimming down to 0.0625%?
The IW380-31B achieves flicker-free dimming to 0.0625% via its proprietary True DC Dimming architecture: it digitally processes analog dimming inputs with 16-bit effective resolution, applies real-time multiplication of DIM1% × DIM2%, and directly controls the high-side gate driver without PWM modulation. This eliminates low-frequency artifacts and ensures monotonic, linear luminance response across the full range-verified in production test.
Is IW380-31B pin-compatible with other iW380 variants like IW380-00B or IW380-20B?
Yes, all iW380 variants-including IW380-31B, IW380-00B, and IW380-20B-share identical 10-lead SOIC package, pinout, and electrical interface. Differences are limited to internal configuration (e.g., CP setpoint, OTP behavior, startup threshold), so PCB layout and external circuitry remain unchanged across variants-enabling design reuse and simplified BOM management.
IW380-31B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 10-SOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 22V
- Voltage - Supply (Max):
- 65V
- 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:
- 10-SOIC
IW380-31B FAQ
1.How can I place an order for IW380-31B through Aetrix?
Please submit a Request for Quotation (RFQ) for IW380-31B 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 IW380-31B reliable?
The price and inventory of IW380-31B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IW380-31B is usually 5 days.
3.What payment methods are accepted for IW380-31B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IW380-31B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IW380-31B?
IW380-31B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IW380-31B 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 IW380-31B?
For technical support, including IW380-31B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IW380-31B requirements.
6.How does Aetrix verify that IW380-31B is sourced from the original manufacturer or authorized distributors?
All IW380-31B 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 IW380-31B meets industry standards.
7.What is the process for return or replacement of IW380-31B?
All IW380-31B units undergo pre-shipment inspection (PSI). If there is an issue with IW380-31B, 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 IW380-31B part is unused and in its original packaging.
Return procedure for IW380-31B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IW380-31B 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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