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Renesas ISL6227IAZ-T
- Part No.:
- ISL6227IAZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ISL6227IAZ-T.pdf
- Description:
- IC REG CTRLR DDR 2OUT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,651
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Product details
Overview
ISL6227IAZ-T from Renesas (formerly Intersil) is a dual-channel synchronous buck PWM controller optimized for notebook PC power systems. It delivers precision regulation for DDR memory (VDDQ/VTT tracking), chipsets, and graphics subsystems across 5V–28V input, with independent 0.9V–5.5V outputs or DDR-specific VTT sourcing/sinking and VREF generation. Its adaptive HYS/PWM mode transition ensures >90% efficiency at light loads and full-load stability.
For engineers reviewing the ISL6227IAZ-T datasheet, ISL6227IAZ-T pinout, ISL6227IAZ-T application, or ISL6227IAZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed DDR-mode behavior, real-world load transient performance, and two rigorously cross-checked alternative controllers for mobile power supply design.
Technical Context
The ISL6227IAZ-T integrates two current-mode PWM controllers with voltage feed-forward ramp modulation, enabling fast transient response to input and load changes without external loop compensation. Each channel supports programmable soft-start, independent enable/disable, and overvoltage (115% setpoint), undervoltage (75% setpoint), and adjustable overcurrent protection via rDS(ON) sensing.
In DDR mode (DDR pin high), Channel 2 becomes a bidirectional VTT regulator tracking VDDQ/2 with ±1% reference accuracy, while PG2/REF outputs a buffered 1.25V reference capable of sourcing 10mA. Phase alignment (0°/90°/180°) is dynamically selected based on VIN voltage and DDR state to minimize input ripple and inter-channel noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 28V - supports direct battery input from Li-ion packs or AC/DC adapters without pre-regulation. |
| PWM Switching Frequency | 300 kHz (typical) - fixed-frequency operation ensures predictable EMI profile and simplifies filter design. |
| Output Voltage Range | 0.9V to 5.5V per channel - covers DDR1/DDR2 VDDQ (1.8V–2.5V), chipset core, and I/O rails. |
| VTT Sourcing/Sinking Capability | ±10 mA (min) - enables active termination for DDR memory buses without external op-amps. |
| Reference Accuracy | ±1.0% (VREF = 0.9V) - ensures tight regulation tolerance critical for DDR memory timing margins. |
| Thermal Resistance θJA | 80°C/W (QSOP-28) - defines maximum power dissipation limit under standard PCB layout conditions. |
| Operating Temperature | −40°C to +100°C - qualified for industrial-grade notebook and tablet PC thermal environments. |
Pinout & Package
ISL6227IAZ-T is housed in a Pb-free 28-lead QSOP package (M28.15), with exposed pad not present. 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 logic-level control (2.0V min high) for sequencing or fault isolation of each buck converter. |
| VSEN1 / VSEN2 | Feedback voltage sense inputs | High-impedance (80 nA bias) nodes for resistive divider-based output voltage programming and PGOOD monitoring. |
| ISEN1 / ISEN2 | Current sense inputs | Monitor lower MOSFET rDS(ON) voltage drop for OCP; supports optional external sense resistor for higher accuracy. |
| UGATE1 / UGATE2 | Upper gate drivers | Low-impedance (4–8 Ω pull-up/pull-down) outputs driving N-channel high-side MOSFET gates. |
| LGATE1 / LGATE2 | Lower gate drivers | Low-impedance (4–8 Ω pull-up, 1.1–3 Ω pull-down) outputs for synchronous rectification control. |
| PG1 / PG2/REF | Power-good / DDR reference output | Open-drain status flag (PG1); dual-function pin: PGOOD2 in dual-mode, VDDQ/2 buffer (10 mA sink/source) in DDR mode. |
| DDR | Mode selection input | Logic-high (≥3V) configures IC as complete DDR power solution; logic-low enables independent dual-channel operation. |
| VIN | Feed-forward input | Sets ramp amplitude for voltage feed-forward control; also determines phase shift (0°/90°/180°) in DDR mode based on voltage level. |
Key Features
| Feature | Design Value |
|---|---|
| rDS(ON) current sensing | Eliminates external sense resistor, reducing BOM count and power loss in high-current applications. |
| HYS/PWM adaptive mode switching | Automatically transitions to diode-emulation hysteretic mode below critical load, improving light-load efficiency by >15%. |
| VTT bidirectional regulation | Provides true sourcing and sinking capability for DDR termination, maintaining signal integrity during data transitions. |
| VDDQ/2 buffered reference output | Delivers stable 1.25V (for 2.5V VDDQ) with ±1% accuracy and 10 mA drive strength-meets JEDEC DDR1/DDR2 spec. |
| Phase-shift synchronization | Reduces input ripple by up to 70% via selectable 0°/90°/180° channel interleaving, easing input capacitor sizing. |
Applications
| DDR Memory Power Supply | Notebook PC Core Power |
|---|---|
Use Scenario: Providing VDDQ (2.5V), VTT (1.25V), and VREF (1.25V) for DDR2 SDRAM in ultraportable notebooks. IC Role / Device Role / Timing Role: Dual-channel controller operating in DDR mode with VTT actively tracking VDDQ/2 and PG2/REF delivering buffered reference. Use Value: Eliminates need for discrete op-amp and reference IC, reducing solution size by 35% and component count by 4. |
Use Scenario: Generating 1.8V GPU core and 2.5V chipset I/O rails from 19.5V laptop adapter input. IC Role / Device Role / Timing Role: Independent dual-buck controller with 180° phase shift, soft-start sequencing, and separate PGOOD signals. Use Value: Achieves <1% output deviation under 3A load step (Figure 7), meeting Intel VRD spec for transient response. |
| Tablet PC System Rail | Embedded Graphics Module |
Use Scenario: Powering ARM-based SoC and LPDDR2 memory in 7-inch tablets with battery input (8.4V–12.6V). IC Role / Device Role / Timing Role: Dual-channel regulator with HYS mode enabled for >85% efficiency at 100mA standby load. Use Value: Extends battery life by 22 minutes per charge cycle versus fixed-frequency-only controllers (per Figure 1–2). |
Use Scenario: Delivering 1.1V GPU core and 1.8V memory interface for discrete graphics modules in industrial embedded PCs. IC Role / Device Role / Timing Role: High-accuracy current-mode controller with ±1% VREF and integrated OVP/UVP for safety-critical operation. Use Value: Meets IEC 62368-1 overvoltage immunity requirements with automatic latch-off and auto-recovery behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT8205AZSP | Single-chip dual-phase controller with integrated MOSFET drivers only; no VTT/VREF generation; 400kHz fixed frequency. | Lacks DDR-specific features (VTT tracking, buffered VREF); suitable for generic dual-rail but not DDR memory power. | Select when DDR compliance is unnecessary and board space is constrained-requires external VTT circuitry. |
| TPS51220ARUKR | TI dual-channel controller with DDR support; includes integrated MOSFET drivers and VTT amplifier; 350kHz frequency. | Supports DDR3/DDR4; adds dynamic VID interface and enhanced thermal shutdown; requires different feedback network. | Choose for DDR3+ designs requiring tighter voltage margins and faster transient response than ISL6227IAZ-T provides. |
Compared with RT8205AZSP and TPS51220ARUKR, the ISL6227IAZ-T uniquely combines DDR1/DDR2-compliant VTT sourcing/sinking, VDDQ/2 buffered reference, and adaptive HYS/PWM mode in a single QSOP-28 package-making it irreplaceable for legacy DDR memory power where footprint and feature alignment are critical.
Availability
ISL6227IAZ-T is available at Aetrix Electronics and suitable for notebook PC motherboard design, DDR memory power delivery, and industrial embedded graphics applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL6227IAZ-T 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 high-performance analog and power management portfolio, including legacy notebook power solutions.
The ISL6227IAZ-T belongs to Renesas' mobile power management product line, engineered specifically for efficient, compact, and compliant DDR memory and system rail regulation in space-constrained portable computing platforms.
FAQ
What is the operating temperature range for the ISL6227IAZ-T?
The ISL6227IAZ-T is rated for −40°C to +100°C ambient operation, matching industrial-grade notebook and tablet PC thermal profiles. This range is validated per FN9094 Rev 7.00, Page 3 (Recommended Operating Conditions), and includes full functionality of all protections, soft-start, and DDR-mode tracking across the span.
How does the ISL6227IAZ-T implement VTT tracking in DDR mode?
In DDR mode (DDR pin high), the ISL6227IAZ-T configures Channel 2 to source/sink current while tracking VDDQ/2 via resistor divider on OCSET2. The PG2/REF pin then buffers and delivers that voltage as a stable 1.25V reference (for 2.5V VDDQ) with ±1% accuracy and 10mA drive capability-fully compliant with DDR1/DDR2 JEDEC specifications.
Can the ISL6227IAZ-T operate with only one channel enabled?
Yes-the ISL6227IAZ-T supports independent channel control: EN1 and EN2 are separate logic inputs. Either channel can be disabled (ENx low) while the other remains fully operational with full PGOOD, OCP, and soft-start functionality. This enables flexible power sequencing and fault containment in multi-rail systems.
What protection features does the ISL6227IAZ-T include?
The ISL6227IAZ-T integrates overvoltage protection (115% setpoint, latched off until recovery), undervoltage lockout (75% setpoint, latched), adjustable overcurrent protection (via ISENx), VCC UVLO (4.14V falling threshold), and thermal foldback. All protections are active during soft-start and normal operation per FN9094 Rev 7.00, Pages 1–2 and 4.
Is the ISL6227IAZ-T RoHS compliant and lead-free?
Yes-the "-Z" suffix in ISL6227IAZ-T denotes RoHS-compliant, Pb-free packaging per FN9094 Rev 7.00, Page 2 (Ordering Information). It uses 100% matte tin (e3) termination finish, compatible with both SnPb and Pb-free reflow processes, and meets IPC/JEDEC J-STD-020 moisture sensitivity level requirements.
ISL6227IAZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-T FAQ
1.How can I place an order for ISL6227IAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6227IAZ-T 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-T reliable?
The price and inventory of ISL6227IAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6227IAZ-T is usually 5 days.
3.What payment methods are accepted for ISL6227IAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6227IAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6227IAZ-T?
ISL6227IAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6227IAZ-T 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-T?
For technical support, including ISL6227IAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6227IAZ-T requirements.
6.How does Aetrix verify that ISL6227IAZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6227IAZ-T 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-T meets industry standards.
7.What is the process for return or replacement of ISL6227IAZ-T?
All ISL6227IAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6227IAZ-T, 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-T part is unused and in its original packaging.
Return procedure for ISL6227IAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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