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Renesas IW388-00B
- Part No.:
- IW388-00B
- Manufacturer:
- Renesas
- Category:
- LED Drivers
- Package:
- 10-SOIC (0.154", 3.90mm Width), Fused Leads
- Datasheet:
-
IW388-00B.pdf
- Description:
- HIGH PERFORMANCE STEP-DOWN DC/DC
- Quantity:
- Payment:
- Shipping:
Inventory:3,778
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Product details
Overview
The IW388-00B from Renesas Electronics is a high-performance step-down DC/DC regulator designed for LED lighting drivers in high-side buck topology, supporting input voltages up to 65 V and output/input voltage ratios up to 98%. It delivers true DC dimming from 100% down to 0.0625% with 0.0625% resolution, tight ±3% CC/CV line and load regulation, and light-off mode consuming <1 mA. It is used in two-stage AC/DC LED drivers and DC/DC LED lighting systems requiring precise current control.
For engineers reviewing the IW388-00B datasheet, IW388-00B pinout, IW388-00B application, or IW388-00B equivalent, this page provides verified technical context, confirmed pin functions, real-world dimming behavior (DIM1% × DIM2%), validated SOIC-10 Batwing package mapping, and two manufacturer-confirmed alternative variants for CC-only operation.
Technical Context
The IW388-00B implements digital-controlled constant-current regulation in a high-side synchronous buck architecture, with internal MOSFET driver and bootstrap gate drive (BOOT pin). Its dual-dimming architecture processes analog voltage, PWM duty, or resistor inputs on both DIM1 and DIM2 pins, multiplying their interpreted percentages to set final LED current.
It supports configurable startup voltage and dimming hysteresis to suppress flicker under noisy signals, and includes dedicated light-off mode with wake-up capability below defined thresholds. Protection features include OVP, OSP, OTP, OCP, sense-resistor short detection, and VVIN over/under-voltage monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 22 V to 65 V DC - supports wide-range industrial and commercial LED driver inputs without external pre-regulation. |
| Dimming Resolution | 0.0625% - enables ultra-fine brightness control down to near-zero current, critical for architectural and hospitality lighting. |
| CC/CV Regulation | ±3% line and load - ensures stable LED current and voltage across input and load variations without external compensation. |
| Light-Off Current | <1 mA - minimizes standby power while maintaining active dimming signal monitoring for fast wake-up. |
| Operating Temp | −40 °C to +150 °C junction - rated for enclosed, thermally constrained LED driver environments. |
| Package | 10-Lead SOIC Batwing - surface-mount compatible with standard reflow profiles and thermal pad-less PCB layout. |
| Protection Features | OVP, OSP, OTP, OCP, VVIN UV/OV, sense-resistor short - enables robust field operation without external protection circuitry. |
Pinout & Package
Package: 10-Lead SOIC Batwing (standard JEDEC MS-012 variant with gull-wing leads), thermally optimized for high-power LED driver applications without exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIM2 | Analog input | Second dimming port accepting analog voltage, PWM, or resistor; multiplies with DIM1 to determine final current percentage. |
| ISNS | Analog input | Current-sense node for buck inductor sensing; sets regulated LED current via external sense resistor. |
| CFG | Analog input | Configuration pin selecting operating mode and startup threshold; tied to GND or VCC for factory-set options. |
| LX | Switching node | High-side MOSFET source connection; drives external inductor and requires low-inductance routing. |
| VIN | Power input | Main DC input supply and voltage sensing node; rated to 70 V absolute max. |
| BOOT | Power supply | Bootstrap capacitor supply for high-side gate driver; referenced to LX, not GND. |
| GND | Ground reference | Primary ground return for analog and power sections; must be low-impedance and star-connected. |
| VCC | IC power | Internal LDO input; supplies bias for control logic and gate drivers; max 6.5 V, 20 mA continuous. |
| DIM1 | Analog input | Primary dimming port supporting analog voltage, PWM, or resistor; multiplied by DIM2 for composite dimming. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-dimming multiplication | DIM1% × DIM2% enables flexible multi-source dimming control (e.g., master + local override) without external logic. |
| Configurable dimming hysteresis | Reduces false triggering from noise on analog or PWM inputs while preserving resolution where needed. |
| Light-off mode with wake-up | Halts LED current and drops quiescent draw to <1 mA, yet resumes regulation within microseconds upon valid dim signal rise. |
| Startup voltage configuration | Prevents turn-on flicker during brown-out or slow-rising input conditions by setting minimum VIN threshold. |
| Integrated protections | OVP, OSP, OTP, OCP, and sense-resistor short detection eliminate need for discrete protection components in BOM. |
Applications
| Two-Stage AC/DC LED Drivers | DC/DC LED Lighting Systems |
|---|---|
Use Scenario: Used downstream of PFC flyback (e.g., iW3677) in commercial troffer or panel lights with universal AC input. IC Role / Device Role / Timing Role: Constant-current LED driver regulating output current with True DC dimming interface to upstream controller. Use Value: Enables seamless integration with Renesas iW350 interface IC and eliminates external current-sense amplifier or dimming logic. | Use Scenario: Standalone DC-powered LED strip or signage driver powered from 24–48 V DC bus. IC Role / Device Role / Timing Role: High-efficiency buck regulator delivering stable CC output with programmable dimming curve and flicker-free start-up. Use Value: Supports 0.0625% dimming resolution and configurable hysteresis to reject noise from shared vehicle or building DC rails. |
| Architectural Dimmable Fixtures | Industrial LED Task Lighting |
Use Scenario: High-end museum or retail track lighting requiring smooth 0–100% dimming without color shift. IC Role / Device Role / Timing Role: Primary CC regulator implementing dual-input dimming (e.g., DALI + local potentiometer) via DIM1/DIM2 multiplication. Use Value: Guarantees linearity across full 0.0625%–100% range and eliminates micro-flicker through configurable startup voltage. | Use Scenario: Factory floor or warehouse high-bay lighting with vibration-prone wiring and EMI-rich environment. IC Role / Device Role / Timing Role: Robust CC driver with integrated OVP, OTP, and sense-resistor short protection for unattended operation. Use Value: Eliminates external fault-handling circuitry and maintains regulation stability despite PWM jitter or analog noise on dim lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| iW388-01B | Same SOIC-10 Batwing package and CC-only function; differs only in lowest dimming startup threshold (0.125% vs. 0.0625% for IW388-00B). | Preferred where deeper dimming near zero is not required, enabling simpler system calibration. | Select iW388-01B when 0.125% minimum dim level meets application requirements and reduces sensitivity to low-level noise. |
| iW388-20B | CV/CC variant with DIM2 repurposed as feedback input; supports voltage regulation in addition to current regulation. | Suitable for hybrid LED+sensor or auxiliary power rail applications requiring dual-mode output control. | Choose iW388-20B only if CV regulation is required; not drop-in compatible due to different CFG pin behavior and feedback path. |
Compared with IW388-00B, iW388-01B offers identical functionality except for a higher dimming startup threshold, simplifying noise immunity at the cost of ultimate low-end resolution; iW388-20B introduces CV/CC mode but changes DIM2's role and requires board-level redesign for feedback routing.
Availability
IW388-00B is available at Aetrix Electronics and suitable for two-stage AC/DC LED drivers, DC/DC LED lighting systems, and architectural dimmable fixtures requiring stable component supply, long-term lifecycle support, and guaranteed dimming linearity.
Supply support for IW388-00B 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 timing solutions for automotive, industrial, and IoT applications.
The IW388 product line targets high-performance, digitally controlled LED drivers for commercial and industrial lighting, emphasizing precision dimming, integrated protection, and system-level simplification.
FAQ
What is the primary operating mode of the IW388-00B?
The IW388-00B operates exclusively in constant-current (CC) mode, as indicated by its "CC only" designation in Renesas' ordering information. It does not support CV/CC or CP/CC modes-those require variants like IW388-20B or IW388-30B. The IW388-00B regulates LED current with ±3% line and load regulation and uses dual-dimming multiplication (DIM1% × DIM2%) to set output current percentage. This makes IW388-00B ideal for dedicated current-regulated LED lighting applications where voltage regulation is handled upstream.
Does the IW388-00B support true DC dimming down to 0.0625%?
Yes, the IW388-00B supports true DC dimming from 100% down to 0.0625% with guaranteed linearity and 0.0625% resolution, as specified in the official Renesas Product Summary Rev. 0.8. This capability is enabled by its advanced digital control architecture and applies specifically to the IW388-00B variant. The dimming range is achieved using either analog voltage, PWM, or resistor inputs on DIM1 and DIM2, with the final current determined by their multiplicative interaction. No external dithering or PWM blending is required-IW388-00B delivers pure DC current modulation.
What package type and pin count does the IW388-00B use?
The IW388-00B uses a 10-Lead SOIC Batwing package-a gull-wing surface-mount variant compliant with JEDEC MS-012 outlines. Pin count is fixed at 10, with confirmed pinout including VIN, GND, VCC, BOOT, LX, ISNS, CFG, DIM1, DIM2, and no NC or unused pins. This package is thermally optimized for LED driver applications and does not include an exposed thermal pad. Layout guidelines emphasize low-inductance routing for LX and proper bootstrap capacitor placement between BOOT and LX.
How does the light-off mode function in the IW388-00B?
The IW388-00B enters light-off mode when dimming signal inputs fall below the configured light-off threshold, turning off LED current while maintaining active monitoring of DIM1 and DIM2. In this state, quiescent current drops below 1 mA, minimizing standby power. Upon detecting a rising dim signal above the light-on threshold, IW388-00B wakes instantly and resumes current regulation without delay or re-initialization. This behavior is hardware-implemented and does not require firmware or external control-making it reliable for occupancy-sensing or timer-based lighting systems.
Can the IW388-00B be used with both analog and PWM dimming simultaneously?
Yes, the IW388-00B supports simultaneous analog and PWM dimming via its dual-dimming architecture: DIM1 and DIM2 each auto-detect signal type (analog voltage, PWM duty, or resistor) and independently interpret their input. The final LED current is calculated as DIM1% × DIM2%, enabling compound dimming schemes-for example, analog voltage on DIM1 for coarse global control and PWM on DIM2 for local scene switching. This functionality is intrinsic to IW388-00B and requires no external signal conditioning or mode selection resistors.
IW388-00B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 10-SOIC (0.154", 3.90mm Width), Fused Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- 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 Batwing
IW388-00B FAQ
1.How can I place an order for IW388-00B through Aetrix?
Please submit a Request for Quotation (RFQ) for IW388-00B 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 IW388-00B reliable?
The price and inventory of IW388-00B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IW388-00B is usually 5 days.
3.What payment methods are accepted for IW388-00B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IW388-00B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IW388-00B?
IW388-00B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IW388-00B 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 IW388-00B?
For technical support, including IW388-00B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IW388-00B requirements.
6.How does Aetrix verify that IW388-00B is sourced from the original manufacturer or authorized distributors?
All IW388-00B 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 IW388-00B meets industry standards.
7.What is the process for return or replacement of IW388-00B?
All IW388-00B units undergo pre-shipment inspection (PSI). If there is an issue with IW388-00B, 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 IW388-00B part is unused and in its original packaging.
Return procedure for IW388-00B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IW388-00B Tags
-
BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
-
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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