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Renesas IW1791-08
- Part No.:
- IW1791-08
- Manufacturer:
- Renesas
- Category:
- Power Supply Controllers, Monitors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IW1791-08.pdf
- Description:
- AC/DC PRIMARY-SIDE RAPID CHARGE
- Quantity:
- Payment:
- Shipping:
Inventory:3,866
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Product details
Overview
The iW1791-08 from Renesas Electronics is a primary-side AC/DC PWM controller for rapid charge applications, supporting USB Power Delivery (USB PD) and Qualcomm Quick Charge 2.0/3.0 protocols. It delivers 10mV DLNK voltage step resolution, enables cable drop compensation, and achieves <20mW no-load power consumption at 230VAC with 5V output. Its quasi-resonant operation and PrimAccurate™ technology eliminate secondary feedback and loop compensation components.
For engineers reviewing the iW1791-08 datasheet, iW1791-08 pinout, iW1791-08 application, or iW1791-08 equivalent, key selection criteria include its DLNK-based digital communication with secondary controllers, multi-level CV/CC regulation without optocoupler dependency beyond single isolation, 10mV-step voltage request capability for USB PD PPS, and integrated SmartDefender+™ protection against soft shorts.
Technical Context
The iW1791-08 implements proprietary DLNK digital communication over a single optocoupler to receive real-time voltage requests, current limits, undershoot detection, and OVP signals from Renesas secondary-side controllers (e.g., iW657P). It uses source-charging VCC startup to eliminate external active start-up circuitry.
Its quasi-resonant PWM/PFM hybrid control adapts switching frequency to load and line conditions while maintaining tight ±1% CV and ±3% CC regulation across 3–20V output ranges. The device supports backward compatibility with QC2.0/QC3.0 via configurable kCC parameters and includes built-in latch-free fault handling for output short-circuit, over-voltage, and over-current events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DLNK Voltage Resolution | 10mV/step - enables precise USB PD Programmable Power Supply (PPS) compliance and smooth voltage transitions requested by mobile devices. |
| No-Load Power Consumption | <20mW at 230VAC, 5V output - achieved via source-charging VCC startup, eliminating external active start-up circuit. |
| Cable Drop Compensation | 4-level, voltage-independent - dynamically compensates for IR loss in charging cables without affecting base output voltage setting. |
| VCC Pin Max Rating | 45V - allows direct connection to bulk capacitor without external LDO, reducing BOM count and thermal overhead. |
| Operating Junction Temp | –40°C to +150°C - supports high-density adapter designs with minimal heatsinking in enclosed environments. |
| ESD Rating (HBM) | ±2000V - ensures robustness during board assembly and field operation in consumer-grade power supply manufacturing. |
Pinout & Package
Package: SOIC-8 (surface-mount, 150 mil width), RoHS-compliant, tape-and-reel packaging (2,500 units/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary-side power and signal return node; connects to transformer auxiliary winding ground and MOSFET source path. |
| DLNK (Pin 2) | Digital link input | Receives bidirectional rapid-charge commands (voltage request, current limit, OVP, undershoot) from secondary via optocoupler-coupled DLNK protocol. |
| VSENSE (Pin 3) | Auxiliary voltage sense | Monitors reflected auxiliary winding voltage for primary-side regulation and supports DLNK communication timing synchronization. |
| CFG (Pin 4) | Configuration input | Sets CDC mode and enables auxiliary winding open-circuit protection; pulled up/down via resistor network. |
| ISENSE (Pin 5) | Current sense input | Accepts primary-side current sense signal for cycle-by-cycle peak-current limiting and multi-level CC regulation. |
| SOURCE (Pin 6) | Power input | Connects to source of external power MOSFET; internally ties to startup VCC charge circuit and internal current sensing path. |
| GATE (Pin 7) | Gate drive output | Drives external N-channel MOSFET switch with 1A peak sink/source capability and adaptive dead-time control. |
| VCC (Pin 8) | IC power supply | Supplies internal bias; rated to 45V DC, enabling direct connection to rectified input or auxiliary winding without LDO. |
Key Features
| Feature | Design Value |
|---|---|
| DLNK Digital Communication | Single-optocoupler interface carries full rapid-charge data (voltage, current, OVP, undershoot), replacing traditional analog feedback and reducing component count by ≥30%. |
| Source-Charging VCC Startup | Eliminates external active start-up circuit, enabling sub-20mW no-load power and simplifying PCB layout in compact USB-C adapters. |
| SmartDefender+™ Protection | Reduces average output power during soft short faults (e.g., damaged cables/connectors) without latching, preserving user experience and enabling automatic recovery. |
| Multi-Mode PWM/PFM Control | Switches between quasi-resonant PWM and burst-mode PFM below 10% load, maintaining >75% efficiency at 10mW load and eliminating audible noise. |
| 4-Level Cable Drop Compensation | Adjusts output voltage in real time based on load current and preset cable resistance profiles, ensuring target VBUS reaches device connector within ±50mV tolerance. |
Applications
| USB PD Fast Charging Adapter | QC3.0-Compatible Wall Charger |
|---|---|
Use Scenario: Compact 30W USB-C wall adapter delivering 5V/3A, 9V/3A, 15V/2A, or 20V/1.5A with PPS support for smartphones and tablets. IC Role / Device Role / Timing Role: Primary-side PWM controller executing quasi-resonant switching, DLNK-based voltage/current command execution, and real-time cable compensation. Use Value: Enables single-chip primary-side regulation with 10mV PPS resolution and <20mW no-load power, meeting DOE VI and EU CoC Tier 2 efficiency requirements. | Use Scenario: Dual-port travel charger supporting simultaneous QC3.0 negotiation on one port and legacy 5V charging on another. IC Role / Device Role / Timing Role: Rapid-charge protocol interpreter and primary-side CV/CC regulator using DLNK handshake with iW657P secondary controller. Use Value: Achieves 200mV incremental voltage steps (3.6–12V) and dynamic current limiting per QC3.0 spec, with seamless transition between protocols. |
| High-Density Notebook Adapter | Multi-Protocol Industrial Docking Station |
Use Scenario: 65W GaN-based notebook adapter with USB PD 3.0 + PPS and QC3.0 fallback for cross-platform compatibility. IC Role / Device Role / Timing Role: Primary-side controller coordinating with iW676 synchronous rectifier and iW657P secondary to manage 3–20V output range and fast transient response. Use Value: Delivers ±1% CV accuracy across full load range and handles 50% load step in <100µs via DLNK undershoot detection and GATE drive optimization. | Use Scenario: Industrial docking station powering laptops, peripherals, and displays via USB-C with programmable voltage/current profiles. IC Role / Device Role / Timing Role: Core AC/DC controller managing multi-rail outputs (5V/12V/20V) under host MCU supervision via DLNK interface. Use Value: Supports firmware-updatable voltage tables and real-time current limiting per port, enabling flexible power allocation without hardware changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar primary-side rapid charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP6908A | Lacks DLNK interface; relies on traditional optocoupler-based analog feedback and separate protocol IC for QC/PD. | Requires additional protocol IC (e.g., MPQ4284) and compensation network; no native PPS or 10mV-step support. | Choose when cost-sensitive design prioritizes BOM simplicity over PPS compliance and ultra-low no-load power. |
| INN3379C | Integrated primary-side controller + QR flyback + SR driver; no DLNK, uses InnoSwitch3 digital communication protocol. | Supports USB PD but not QC3.0 natively; fixed 20mV voltage step resolution; no cable drop compensation. | Prefer for fully integrated solutions where secondary-side intelligence is embedded in InnoSwitch3 family, not discrete DLNK-compatible controllers. |
Compared with MP6908A and INN3379C, the iW1791-08 uniquely combines 10mV DLNK resolution, source-charged VCC startup, and 4-level cable compensation-enabling PPS-compliant adapters with <20mW no-load power and zero external loop compensation components.
Availability
iW1791-08 is available at Aetrix Electronics and suitable for USB PD fast charging adapters, QC3.0 wall chargers, and high-density notebook power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for iW1791-08 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 products for automotive, industrial, infrastructure, and IoT applications.
The iW1791-08 belongs to Renesas' Rapid Charge™ controller product line, designed specifically for high-efficiency, low-noise, multi-protocol AC/DC adapters targeting smartphone, tablet, and laptop charging systems.
FAQ
What is the DLNK voltage resolution supported by the iW1791-08?
The iW1791-08 supports 10mV per step DLNK voltage resolution, enabling precise USB PD Programmable Power Supply (PPS) compliance and fine-grained voltage adjustments requested by mobile devices. This resolution is confirmed in the Ordering Information table for iW1791-08 and distinguishes it from variants like iW1791-00 (25mV/step). The iW1791-08 uses this resolution for real-time output voltage updates without secondary feedback loops.
Does the iW1791-08 require an external active start-up (ASU) circuit?
No, the iW1791-08 eliminates the need for an external active start-up circuit through its source-charging VCC technology, which charges the VCC capacitor directly from the SOURCE pin during startup. This architecture enables <20mW no-load power consumption at 230VAC with typical 5V output. The iW1791-08 datasheet explicitly states this feature replaces ASU circuits, reducing BOM count and improving reliability.
Which secondary-side controllers are compatible with the iW1791-08 for USB PD and QC3.0 operation?
The iW1791-08 is designed to operate with Renesas' DLNK-compatible secondary-side controllers, specifically the iW657P for USB PD and QC2.0/3.0 protocol handling. The iW657P communicates bidirectionally with the iW1791-08 via the DLNK pin to deliver voltage requests, current limits, and protection signals. The iW1791-08 datasheet confirms this pairing in Figure 3.1 and Section 1, making iW657P the validated secondary controller for full protocol support.
How does the iW1791-08 implement cable drop compensation?
The iW1791-08 provides user-configurable 4-level cable drop compensation that operates independently of output voltage setting. It adjusts output voltage in real time based on sensed load current and pre-programmed resistance profiles, ensuring target VBUS reaches the device connector within ±50mV. This feature is enabled in the iW1791-08 variant (per Ordering Information table) and requires no external components-implemented entirely within the iW1791-08's analog front-end and DLNK timing logic.
What protection features are integrated into the iW1791-08?
The iW1791-08 integrates SmartDefender+™ control for soft short faults, plus built-in protections against output short-circuit (including half-short and soft-short), output over-voltage, and output over-current-all without latching. It also includes auxiliary winding open-circuit detection via the CFG pin and VSENSE-based undershoot detection for fast dynamic load response. These protections are detailed in Sections 2 and 4 of the iW1791-08 datasheet and require no external circuitry.
IW1791-08 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Applications:
- Power Supply Controller
- Voltage - Input:
- -
- Voltage - Supply:
- 45V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
IW1791-08 FAQ
1.How can I place an order for IW1791-08 through Aetrix?
Please submit a Request for Quotation (RFQ) for IW1791-08 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 IW1791-08 reliable?
The price and inventory of IW1791-08 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IW1791-08 is usually 5 days.
3.What payment methods are accepted for IW1791-08?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IW1791-08 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IW1791-08?
IW1791-08 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IW1791-08 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 IW1791-08?
For technical support, including IW1791-08 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IW1791-08 requirements.
6.How does Aetrix verify that IW1791-08 is sourced from the original manufacturer or authorized distributors?
All IW1791-08 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 IW1791-08 meets industry standards.
7.What is the process for return or replacement of IW1791-08?
All IW1791-08 units undergo pre-shipment inspection (PSI). If there is an issue with IW1791-08, 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 IW1791-08 part is unused and in its original packaging.
Return procedure for IW1791-08:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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