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Renesas IW380-12BD
- Part No.:
- IW380-12BD
- Manufacturer:
- Renesas
- Category:
- LED Drivers
- Package:
- 10-SOP (0.154", 3.90mm Width)
- Datasheet:
-
IW380-12BD.pdf
- Description:
- HIGH-PERFORMANCE STEP-DOWN DC/DC
- Quantity:
- Payment:
- Shipping:
Inventory:4,593
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Product details
Overview
The IW380-12BD from Renesas Electronics is a high-performance step-down DC/DC controller designed for LED lighting drivers operating up to 78V input, supporting true DC dimming from 0.0625% to 100% with 0.0625% resolution, and featuring dual-dimming inputs (DIM1/DIM2) for multiplicative current control in CC-only topology with OTP de-rating disabled and 100ms startup delay.
For engineers reviewing the IW380-12BD datasheet, IW380-12BD pinout, IW380-12BD application, or IW380-12BD equivalent, this page delivers verified technical context on its buck-mode operation, dual-analog-dimming architecture, light-off mode behavior, configurable startup voltage, and SOIC-10 package implementation for stable LED current regulation in two-stage AC/DC and DC/DC lighting systems.
Technical Context
The IW380-12BD implements a high-side switching buck controller with digital PWM-based current regulation, supporting only constant-current (CC) mode per ordering option. It processes analog dimming signals at DIM1 and DIM2 independently, then multiplies their interpreted percentages to determine final LED current setpoint - enabling precise 0.0625%–100% dimming with guaranteed linearity.
It integrates dedicated light-off mode activation below a user-configurable threshold (0.125% minimum), drawing <1mA quiescent current while monitoring inputs for wake-up; startup voltage is configurable to suppress flicker during power cycling. Protection features include OVP, OSP, VVIN UV/OV, OCP, sense-resistor short detection, and OTP with de-rating disabled per variant specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 22V to 78V DC - supports wide-input LED drivers powered from rectified AC or industrial DC rails. |
| Dimming Range & Resolution | 0.0625% to 100% with 0.0625% resolution - enables ultra-fine brightness control without PWM artifacts. |
| Operating Mode | Constant-Current (CC) only - no CV or CP regulation; optimized for fixed-output-current LED strings. |
| Light-Off Threshold | 0.125% minimum dimming startup level - prevents unintended turn-on from noise or leakage. |
| Startup Delay | Extra 100ms delay - suppresses inrush-related flicker during cold start or brown-out recovery. |
| OTP Behavior | Over-temperature current de-rating disabled - maintains full output current until thermal shutdown triggers. |
| Package | SOIC-10 - surface-mount, industry-standard footprint compatible with automated assembly. |
Pinout & Package
Package: 10-Lead SOIC (Small Outline Integrated Circuit), 3.9mm × 4.9mm body, 1.27mm pitch, exposed pad not specified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input and sensing node | Accepts 22–78V DC input; also used for input voltage monitoring and protection thresholds. |
| VCC | IC internal supply rail | Regulated 5V supply (max 20mA) powering internal logic and gate driver circuitry. |
| DIM1 | Analog dimming input 1 | Programs maximum LED current via resistor or analog voltage; defines first multiplier factor. |
| DIM2 | Analog dimming input 2 | Supports auto-detected 3-in-1 dimming (resistor/PWM/analog); defines second multiplier factor. |
| GND | Reference ground | Common return path for all analog and power domains; critical for current-sense accuracy. |
| ISNS | Current sense input | Connects to low-side sense resistor; enables tight ±3% CC line/load regulation. |
| CFG | Configuration input | Resistor-programmable pin setting startup voltage, hysteresis, and dimming signal filtering. |
| LX | Switching node | Drives external high-side MOSFET source; connects to buck inductor and freewheeling diode/capacitor. |
| HSG | High-side gate driver output | Drives external N-channel MOSFET gate; requires bootstrap supply via BOOT pin. |
| BOOT | Bootstrap power supply | Provides floating voltage for HSG driver; must be decoupled with 0.1µF ceramic capacitor to LX. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-dimming multiplication | DIM1% × DIM2% output current scaling enables flexible multi-source dimming control without external logic. |
| Configurable startup voltage | Adjustable via CFG pin resistor to prevent false turn-on during power ramp or brown-out conditions. |
| Light-off mode | Sub-1mA quiescent draw while actively monitoring DIM inputs for immediate wake-up above light-on threshold. |
| Noise-immune dimming | Configurable hysteresis on DIM pins maintains stable output current under noisy analog or jittery PWM inputs. |
| Comprehensive protection suite | OVP, OSP, VVIN UV/OV, OCP, sense-resistor short, and OTP ensure robust field reliability in unregulated environments. |
Applications
| Two-Stage AC/DC General LED Lighting | DC/DC General LED Lighting |
|---|---|
Use Scenario: Indoor commercial downlights using PFC front-end (e.g., iW3677) followed by IW380-12BD buck stage. IC Role / Device Role / Timing Role: Primary CC controller regulating LED string current with ultra-fine dimming resolution and flicker-free startup. Use Value: Enables smooth 0.0625%–100% dimming across DALI, 0–10V, or proprietary analog interfaces without PWM-induced EMI. | Use Scenario: Industrial LED signage powered directly from 48V DC bus with strict thermal management requirements. IC Role / Device Role / Timing Role: Standalone CC buck controller delivering stable current despite input voltage variation and ambient temperature shifts. Use Value: OTP de-rating disabled ensures consistent lumen output up to 150°C junction temperature before shutdown. |
| Two-Stage LED Light Strip Drivers | Architectural LED Accent Lighting |
Use Scenario: Flexible LED tape systems requiring long cable runs and multiple dimming zones controlled via single-wire analog signals. IC Role / Device Role / Timing Role: Dual-dimming port interface accepting RSET + PWM or dual analog inputs for zone-level current scaling. Use Value: Multiplicative dimming allows independent control of base brightness (DIM1) and scene modulation (DIM2) without microcontroller intervention. | Use Scenario: High-CRI museum lighting where color stability demands zero PWM frequency interference and minimal current ripple. IC Role / Device Role / Timing Role: True DC dimming controller eliminating switching artifacts in sensitive optical environments. Use Value: 0.0625% resolution supports imperceptible fade-to-black transitions while maintaining chromaticity within Δu'v' < 0.002. |
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; 6–75V input; no dual-dimming multiplication; max dimming 10:1 (10%) resolution. | Lacks true DC dimming below 10%; requires external op-amp for multi-input dimming mixing. | Select when cost sensitivity outweighs ultra-fine dimming need and system uses simple 1-input analog/PWM control. |
| MPQ4425HG-A | Monolithic synchronous buck with integrated FETs; 4.5–60V input; 0–100% PWM dimming only; no analog dimming support. | Not suitable for true DC dimming; limited to PWM-based brightness control with inherent EMI concerns. | Choose for compact, low-BOM-count designs where PWM dimming suffices and input voltage stays ≤60V. |
Compared with LM3409HV and MPQ4425HG-A, the IW380-12BD uniquely delivers sub-0.1% true DC dimming with dual-input multiplication, configurable startup delay, and OTP de-rating disable - making it optimal for premium architectural and commercial LED systems demanding flicker-free, noise-immune, and thermally resilient current regulation.
Availability
IW380-12BD is available at Aetrix Electronics and suitable for two-stage AC/DC general LED lighting, DC/DC general LED lighting, and architectural LED accent lighting requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for IW380-12BD 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 IW380-12BD belongs to Renesas' intelligent LED driver IC product line, engineered specifically for high-fidelity, flicker-free LED current regulation in commercial and architectural lighting systems demanding precision dimming and robust thermal behavior.
FAQ
What is the primary function of the IW380-12BD in an LED lighting system?
The IW380-12BD serves as a high-performance step-down DC/DC controller that regulates constant LED current in buck topology applications. It delivers precise current control from 22V to 78V input, supports true DC dimming down to 0.0625%, and implements dual-dimming multiplication (DIM1 × DIM2) for flexible brightness scaling. Its design eliminates PWM artifacts, making IW380-12BD ideal for high-end architectural and commercial LED drivers where flicker-free operation is mandatory.
How does the IW380-12BD handle dimming signal noise or jitter?
The IW380-12BD provides configurable hysteresis on both DIM1 and DIM2 pins to reject noise and stabilize output current under jittery PWM or fluctuating analog dimming signals. This feature trades minor dimming resolution loss for immunity to signal instability - ensuring consistent LED current even with low-quality 0–10V or PWM sources. The IW380-12BD maintains ±3% CC regulation accuracy regardless of input noise, preserving light quality in real-world installations.
What protection features are enabled in the IW380-12BD variant?
The IW380-12BD includes output overvoltage (OVP), output short-circuit (OSP), VVIN over/under-voltage, overcurrent (OCP), sense-resistor short detection, and over-temperature protection (OTP) with de-rating disabled. This means IW380-12BD sustains full rated current up to thermal shutdown - unlike standard variants that reduce output current gradually above threshold. All protections are fully integrated and require no external components for basic implementation.
Can the IW380-12BD be used in constant-voltage or constant-power modes?
No - the IW380-12BD is configured exclusively for constant-current (CC) operation per its ordering option. It does not support CV/CC or CP/CC modes. Variants like IW380-20B or IW380-31B provide those capabilities, but IW380-12BD is optimized for pure CC regulation with enhanced dimming fidelity and startup delay. Using IW380-12BD in non-CC applications would require external circuitry and is not supported by Renesas.
What is the significance of the "100ms startup delay" in the IW380-12BD?
That extra 100ms startup delay in IW380-12BD prevents visible LED flash or flicker during initial power-up or after brown-out events by delaying output current enable until input voltage stabilizes. It works in conjunction with the configurable startup voltage (set via CFG pin) to ensure clean turn-on across varying line conditions. This behavior is factory-trimmed and cannot be disabled - a key differentiator of IW380-12BD versus base IW380-00 or IW380-01B variants.
IW380-12BD 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:
- 21.56V ~ 63.7V
- 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
IW380-12BD FAQ
1.How can I place an order for IW380-12BD through Aetrix?
Please submit a Request for Quotation (RFQ) for IW380-12BD 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 IW380-12BD reliable?
The price and inventory of IW380-12BD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IW380-12BD is usually 5 days.
3.What payment methods are accepted for IW380-12BD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IW380-12BD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IW380-12BD?
IW380-12BD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IW380-12BD 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 IW380-12BD?
For technical support, including IW380-12BD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IW380-12BD requirements.
6.How does Aetrix verify that IW380-12BD is sourced from the original manufacturer or authorized distributors?
All IW380-12BD 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 IW380-12BD meets industry standards.
7.What is the process for return or replacement of IW380-12BD?
All IW380-12BD units undergo pre-shipment inspection (PSI). If there is an issue with IW380-12BD, 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 IW380-12BD part is unused and in its original packaging.
Return procedure for IW380-12BD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IW380-12BD Tags
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