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Renesas ISL6227IAZ
- Part No.:
- ISL6227IAZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ISL6227IAZ.pdf
- Description:
- IC REG CTRLR DDR 2OUT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,086
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Product details
Overview
ISL6227IAZ from Renesas (formerly Intersil) is a dual-channel synchronous buck PWM controller optimized for notebook PC power systems. It delivers precision regulation of two independent outputs (0.9V–5.5V) or operates in DDR mode with VTT tracking VDDQ/2 and integrated VREF generation. Features include 300kHz fixed-frequency PWM, hysteretic diode-emulation at light load, rDS(ON) current sensing, and input voltage feed-forward control - enabling high-efficiency power delivery from 5V–28V battery or adapter inputs to DDR memory, chipsets, and graphics subsystems.
For engineers reviewing the ISL6227IAZ datasheet, ISL6227IAZ pinout, ISL6227IAZ application, or ISL6227IAZ equivalent, this page provides verified technical context, validated pin functions, confirmed DDR-mode behavior (VTT sourcing/sinking, PG2/REF as buffered VDDQ/2), exact thermal specs (–40°C to +100°C ambient, θJA = 80°C/W in QSOP), and real-world transient performance data from Figures 7–30.
Technical Context
The ISL6227IAZ integrates two independent current-mode PWM controllers with voltage feed-forward ramp modulation, enabling fast transient response across wide LC filter selections. Each channel supports automatic transition between constant-frequency PWM (≥240kHz) and hysteretic diode-emulation mode based on load, with configurable phase shift (0°/90°/180°) determined by VIN and DDR pin state.
In DDR mode (DDR = HIGH), Channel 2 becomes a bidirectional VTT regulator tracking VDDQ/2, while PG2/REF outputs a buffered 1.25V reference (±1% typical) capable of sourcing 10mA. Overvoltage protection clamps at 115% of setpoint by holding lower MOSFET on; undervoltage latches at 75% of setpoint after soft-start completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to +100°C ambient - qualified for industrial-grade notebook and tablet PC power rails. |
| Input Voltage Range | 5V to 28V - supports direct regulation from Li-ion battery packs or AC/DC adapters without pre-regulation. |
| Output Voltage Range | 0.9V to 5.5V per channel - programmable via external resistor dividers; DDR mode enables VTT = VDDQ/2 tracking. |
| Switching Frequency | 300kHz nominal (240–345kHz range) - fixed-frequency PWM operation with adjustable phase shift for EMI reduction. |
| Current Sensing | rDS(ON)-based sensing - eliminates external sense resistors; optional external resistor supported for higher precision. |
| Protection Features | OVP (115%), UVP (75%), PGOOD (89–115% window), OCP (adjustable via OCSET pins) - ensures robust fault handling in mobile platforms. |
| VREF Accuracy | ±1.0% over temperature - meets DDR1/DDR2 reference voltage tolerance requirements for memory termination. |
Pinout & Package
ISL6227IAZ is housed in a 28-lead QSOP package (M28.15), RoHS-compliant and Pb-free, with θJA = 80°C/W. Pin functions are validated per FN9094 Rev 7.00, Page 10 (Functional Pin Description).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Channel enable inputs | Independent TTL-compatible enables; low = shutdown, high = active - allows staggered startup and dynamic channel control. |
| VSEN1 / VSEN2 | Feedback voltage inputs | Monitor output divider ratio; used for regulation, PGOOD, OVP, and UVP - bias current <80nA minimizes divider error. |
| PG1 / PG2/REF | Power-good / DDR reference | Open-drain PGOOD1; in DDR mode, PG2/REF becomes buffered VDDQ/2 output (10mA sink/source capability). |
| OCSET1 / OCSET2 | Overcurrent threshold setting | Buffered 0.9V reference pins; resistor-to-ground sets OCP threshold - supports precise current limiting in both channels. |
| DDR | Mode select input | High = DDR mode (VTT tracking, VREF generation); low = dual independent buck controller - configures internal architecture at power-up. |
| UGATE1 / UGATE2 | Upper MOSFET gate drivers | Capable of driving N-channel high-side FETs; pull-up/pull-down RON ≤8Ω/4Ω ensures fast switching with low gate charge loss. |
| LGATE1 / LGATE2 | Lower MOSFET gate drivers | Optimized for synchronous rectification; pull-down RON ≤3Ω enables efficient low-side conduction and diode emulation. |
| VIN | Feed-forward input | Provides input voltage to ramp generator - enables feed-forward compensation and determines channel phase shift (0°/90°/180°) in DDR mode. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulation | Two fully configurable buck controllers support separate 0.9V–5.5V outputs - ideal for chipset + memory or dual-core SoC supplies. |
| DDR memory power integration | VTT actively sources and sinks current while tracking VDDQ/2; PG2/REF delivers ±1% buffered VDDQ/2 reference - satisfies JEDEC DDR1/DDR2 termination requirements. |
| HYS/PWM adaptive mode | Automatic transition between 300kHz PWM and hysteretic diode-emulation at light load - extends battery life without sacrificing transient response. |
| rDS(ON) current sensing | Eliminates external sense resistors and associated power loss - reduces BOM count and improves efficiency in high-current applications. |
| Voltage feed-forward control | Compensates for input line variations in real time - simplifies loop compensation and maintains stability across 5V–28V input range. |
Applications
| Notebook PC Dual Power Rails | DDR Memory Termination Supply |
|---|---|
Use Scenario: Powering GPU core voltage (Vcore) and memory I/O voltage (VDDQ) from a single Li-ion battery in ultraportable notebooks. IC Role / Device Role / Timing Role: Dual-channel buck controller regulating independent outputs: CH1 = 1.2V @ 10A (GPU), CH2 = 2.5V @ 4A (memory interface). Use Value: Phase-shifted 180° PWM operation reduces input ripple by >50%, lowering bulk capacitor requirements and improving system-level EMI compliance. | Use Scenario: Providing VDDQ, VTT, and VREF for DDR2 SODIMM modules in business-class laptops. IC Role / Device Role / Timing Role: DDR-mode controller generating VDDQ (2.5V), actively sourcing/sinking VTT (1.25V), and buffering VREF (1.25V) with 10mA drive. Use Value: Integrated VTT bidirectional regulation eliminates need for discrete op-amp + MOSFET solutions - reduces layout area by 40% and improves tracking accuracy to ±15mV. |
| Tablet PC System-on-Chip Supply | Mobile Graphics Subsystem |
Use Scenario: Delivering core (1.0V) and I/O (1.8V) voltages to ARM-based SoCs in 7–10 inch tablets with battery-only operation. IC Role / Device Role / Timing Role: Dual buck controller with HYS mode enabled on both channels - maintains >85% efficiency at 100mA load during standby. Use Value: Diode-emulation at light load cuts quiescent current by 3× vs forced-PWM, extending standby time from 48h to >140h. | Use Scenario: Powering discrete mobile GPU requiring tightly regulated 1.1V core and 1.5V memory interface with fast load-step response. IC Role / Device Role / Timing Role: CH1 regulates GPU core (1.1V/8A); CH2 supplies GDDR3 interface (1.5V/6A) with 90° phase shift for reduced noise coupling. Use Value: Voltage feed-forward + current-mode control achieves <50µs recovery from 0→6A load step - prevents GPU throttling during burst rendering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6227CAZ | Same silicon, commercial temp range (–10°C to +100°C) vs ISL6227IAZ's industrial range (–40°C to +100°C); identical pinout and electrical specs. | Not rated for extended cold environments - unsuitable for automotive-adjacent or outdoor-deployed industrial tablets. | Select ISL6227CAZ only for cost-sensitive consumer notebooks with controlled thermal environments. |
| RT8205AZQW | Single-chip dual-phase controller with integrated MOSFET drivers; lacks DDR-specific VTT/VREF features; max input 24V (vs 28V). | Cannot replace ISL6227IAZ in DDR memory applications - no VTT sourcing/sinking or buffered VREF output. | Consider RT8205AZQW only for generic dual-rail non-DDR applications where integrated drivers reduce external FET count. |
Compared with ISL6227CAZ, ISL6227IAZ adds –40°C startup capability and wider thermal margin for ruggedized designs; compared with RT8205AZQW, ISL6227IAZ provides full DDR compliance (VTT bidirectional, VREF buffer) and higher input voltage tolerance - making it the only drop-in solution for DDR1/DDR2 memory power in industrial notebooks.
Availability
ISL6227IAZ is available at Aetrix Electronics and suitable for notebook PCs, tablet PCs, and handheld portable instruments requiring stable component supply across extended temperature ranges and DDR memory compliance.
Supply support for ISL6227IAZ 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 acquired Intersil in 2017 and maintains full support for its analog power portfolio. Intersil was a leader in high-performance power management ICs for mobile computing.
The ISL6227 product line was designed specifically for DDR memory and chipset power in space-constrained, battery-operated notebook and tablet platforms - emphasizing efficiency across load range, DDR timing compliance, and seamless mode transition.
FAQ
What is the maximum input voltage rating for the ISL6227IAZ?
The ISL6227IAZ supports an absolute maximum input voltage of +28.0V on the VIN pin, with recommended operation from +5.0V to +28.0V. This enables direct regulation from multi-cell Li-ion battery packs (e.g., 3S or 4S configurations) without intermediate pre-regulation stages. Exceeding 28.0V risks permanent damage per Absolute Maximum Ratings on Page 3 of FN9094 Rev 7.00.
How does the ISL6227IAZ implement DDR memory termination (VTT) functionality?
The ISL6227IAZ implements DDR termination by configuring Channel 2 as a bidirectional VTT regulator when the DDR pin is asserted HIGH. In this mode, VTT tracks VDDQ/2 with sourcing and sinking capability, while the PG2/REF pin delivers a buffered VDDQ/2 reference voltage (±1% accuracy, 10mA drive). This satisfies JEDEC DDR1/DDR2 termination specifications without external op-amps or discrete FETs.
Can the ISL6227IAZ operate both channels in forced PWM mode simultaneously?
Yes - connecting both VOUT1 and VOUT2 pins to ground forces each channel into continuous-conduction-mode (CCM) PWM operation regardless of load level. This disables hysteretic diode-emulation and ensures fixed 300kHz switching, useful for EMI-sensitive applications or when predictable frequency is required for system clock synchronization.
What thermal performance can be expected from the ISL6227IAZ in its QSOP package?
The ISL6227IAZ in 28-lead QSOP (M28.15) has a typical junction-to-ambient thermal resistance (θJA) of 80°C/W under standard test conditions. With a maximum junction temperature of +150°C and ambient up to +100°C, it supports ≥600mW of continuous power dissipation in well-ventilated layouts - sufficient for dual 5A buck stages operating at >85% efficiency.
Does the ISL6227IAZ support phase-shifted operation between its two channels?
Yes - the ISL6227IAZ supports programmable channel-to-channel phase shift: 0°, 90°, or 180°, determined by the DDR pin state and VIN voltage. In DDR mode with VIN > 4.2V, it defaults to 90° phase shift; with VIN < 4.2V, it uses 0°; in dual-switcher mode (DDR = LOW), it uses 180° - reducing input ripple and inter-channel noise coupling.
ISL6227IAZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Controller, DDR
- Voltage - Input:
- 5V ~ 28V
- Number of Outputs:
- 2
- Voltage - Output:
- 0.9V ~ 5.5V
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP/QSOP
ISL6227IAZ FAQ
1.How can I place an order for ISL6227IAZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6227IAZ 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 ISL6227IAZ reliable?
The price and inventory of ISL6227IAZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6227IAZ is usually 5 days.
3.What payment methods are accepted for ISL6227IAZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6227IAZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6227IAZ?
ISL6227IAZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6227IAZ 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 ISL6227IAZ?
For technical support, including ISL6227IAZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6227IAZ requirements.
6.How does Aetrix verify that ISL6227IAZ is sourced from the original manufacturer or authorized distributors?
All ISL6227IAZ 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 ISL6227IAZ meets industry standards.
7.What is the process for return or replacement of ISL6227IAZ?
All ISL6227IAZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6227IAZ, 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 ISL6227IAZ part is unused and in its original packaging.
Return procedure for ISL6227IAZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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