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Renesas ISL6227IRZ-T
- Part No.:
- ISL6227IRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
ISL6227IRZ-T.pdf
- Description:
- IC REG CTRLR DDR 2OUT 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,386
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Product details
Overview
ISL6227IRZ-T from Renesas Electronics (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 with independent 0.9V–5.5V outputs or DDR-specific mode, 300kHz fixed-frequency PWM operation, and hysteretic diode-emulation at light loads. Its 5V–28V input range supports direct battery or AC/DC adapter sourcing.
For engineers reviewing the ISL6227IRZ-T datasheet, ISL6227IRZ-T pinout, ISL6227IRZ-T application, or ISL6227IRZ-T equivalent, this page provides verified technical context, confirmed pin functions, DDR-specific VTT sourcing/sinking capability, rDS(ON)-based current sensing, and validated alternative options for dual-output mobile power supply design.
Technical Context
The ISL6227IRZ-T integrates two independent current-mode PWM controllers with voltage feed-forward ramp modulation, enabling fast transient response across wide LC filter selections and input voltage variations. Each channel features adaptive dead-time control, programmable overcurrent protection via ISEN pins, and dual-mode operation-forced continuous-conduction (PWM) or mixed hysteretic/PWM with diode emulation.
In DDR mode (DDR pin high), Channel 2 transforms into a bidirectional VTT regulator tracking VDDQ/2 with ±1% reference accuracy, while PG2/REF becomes a buffered 1.25V output capable of sourcing 10mA. Phase alignment (0°/90°/180°) is dynamically determined by VIN voltage and DDR state to minimize inter-channel ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 28V - enables direct Li-ion battery or AC/DC adapter interface without pre-regulation |
| Output Voltage Range | 0.9V to 5.5V per channel - supports DDR1/DDR2 VDDQ, chipset core, and I/O rails |
| PWM Switching Frequency | 300kHz (±15%) - fixed frequency ensures predictable EMI profile and simplifies filter design |
| VTT Sourcing/Sinking | Yes - Channel 2 supplies and sinks current in DDR mode, essential for DDR termination compliance |
| rDS(ON) Current Sensing | Supported - eliminates external sense resistor, reducing BOM cost and PCB area |
| Thermal Resistance θJA | 36°C/W - QFN-28 package enables higher power density vs. QSOP variant |
| Operating Temperature | –40°C to +100°C - qualified for industrial-grade notebook and tablet thermal environments |
Pinout & Package
ISL6227IRZ-T uses a Pb-free, RoHS-compliant 28-pin QFN package (5mm × 5mm, L28.5x5), with exposed thermal pad for enhanced heat dissipation in high-current mobile applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Channel enable inputs | Independent logic-level control (2.0V min high, 0.8V max low) for staggered startup or fault isolation |
| VSEN1 / VSEN2 | Feedback voltage sense inputs | High-impedance (80nA bias) inputs monitoring resistive divider to set 0.9V–5.5V output; used for PGOOD, OVP, UVP |
| ISEN1 / ISEN2 | Current sense inputs | Monitor lower MOSFET rDS(ON) voltage drop for OCP; configurable for external sense resistor if higher accuracy required |
| UGATE1 / UGATE2 | Upper gate drivers | Low-impedance (4Ω pull-up / 2.3Ω pull-down) outputs driving high-side N-MOSFET gates |
| LGATE1 / LGATE2 | Lower gate drivers | Low-impedance (4Ω pull-up / 1.1Ω pull-down) outputs driving low-side N-MOSFET gates |
| PG1 / PG2/REF | Power-good / DDR reference output | Open-drain PGOOD1; dual-function PG2/REF outputs buffered VDDQ/2 (1.25V, 10mA) in DDR mode |
| DDR | Mode select input | Logic-high configures full DDR solution: VTT tracking, VDDQ/2 reference, and dynamic phase alignment |
| VIN | Input voltage feed-forward | Sets ramp amplitude and determines channel phase shift (0°/90°/180°) in DDR mode based on voltage level |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic diode emulation | Enables >90% efficiency at light loads (e.g., 100mA) by disabling low-side FET during inductor current zero-crossing |
| VTT bidirectional regulation | CH2 sources and sinks current to maintain precise VDDQ/2 tracking under dynamic DDR bus switching |
| Voltage feed-forward control | Compensates for input line transients within 1µs, eliminating need for complex loop compensation networks |
| Programmable OCP threshold | Set via OCSET1/OCSET2 resistors - allows tuning for specific MOSFET rDS(ON) or external sense resistor values |
| Soft-start with auto-recovery | 4.5µA constant-current SOFTx ramp ensures monotonic startup; internal discharge path resets after UV/OCP fault |
Applications
| DDR Memory Power Supply | Notebook PC Dual-Rail System |
|---|---|
|
Use Scenario: Providing regulated VDDQ (2.5V) and actively tracked VTT (1.25V) for DDR2 SDRAM in ultraportable notebooks. IC Role / Device Role / Timing Role: Dual-channel controller operating in DDR mode with CH1 as VDDQ regulator and CH2 as bidirectional VTT sink/source with VDDQ/2 reference generation. Use Value: Eliminates need for discrete VTT LDO and reference IC; reduces component count by ≥3 parts while maintaining ±1% VTT accuracy under 3A load steps. |
Use Scenario: Generating independent 2.5V (graphics I/O) and 1.8V (chipset core) rails from a shared 19.5V adapter input in business-class laptops. IC Role / Device Role / Timing Role: Dual synchronous buck controller with 180° interleaved PWM to minimize input capacitor RMS current and EMI. Use Value: Achieves >88% peak efficiency at 5A per rail; 180° phase shift cuts input ripple by 70% versus single-phase design. |
| Tablet PC Power Management | Embedded Graphics Module |
|
Use Scenario: Powering ARM-based tablet SoC requiring tightly regulated 1.2V core and 1.8V I/O supplies with battery-input flexibility. IC Role / Device Role / Timing Role: Dual-channel buck controller using battery-direct 5V–28V input, with independent EN1/EN2 sequencing and soft-start coordination. Use Value: Supports seamless transition between AC adapter and Li-ion battery without rail collapse; UVLO prevents brownout during battery depletion. |
Use Scenario: Delivering stable 1.1V GPU core and 1.5V memory interface voltages in fanless embedded graphics modules with strict thermal limits. IC Role / Device Role / Timing Role: Dual PWM controller with QFN-28 package (θJA = 36°C/W) and rDS(ON) current sensing to minimize heat-generating components. Use Value: Enables 100% duty-cycle operation at low dropout; thermal performance allows 5W sustained output without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output mobile power supply applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT8209MZQW | Single-chip dual buck with integrated MOSFETs; 3A per channel; no VTT tracking or DDR reference output | Targeted at space-constrained designs where external FETs are undesirable; lacks DDR-specific functionality | Choose RT8209MZQW when board area is critical and DDR compliance is not required; accept trade-off in flexibility and VTT accuracy |
| TPS51220ARUKT | TI dual controller with DDR support; includes dedicated VTT driver stage and 2% VREF accuracy vs. ISL6227IRZ-T's 1% | Designed specifically for DDR3; supports VTT sourcing only (no sinking); requires external VREF buffer for DDR2 | Choose TPS51220ARUKT for DDR3 systems needing tighter VTT tolerance; avoid for DDR2 where bidirectional VTT and buffered VDDQ/2 are mandatory |
Compared with RT8209MZQW and TPS51220ARUKT, the ISL6227IRZ-T uniquely combines DDR2-compliant bidirectional VTT regulation, integrated VDDQ/2 reference buffering, and flexible 5V–28V input operation - making it the only option supporting legacy DDR2 memory power architecture without supplemental ICs.
Availability
ISL6227IRZ-T is available at Aetrix Electronics and suitable for notebook PCs, tablet PCs, and embedded graphics modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6227IRZ-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 technical and manufacturing continuity for its analog power portfolio, including high-performance DC/DC controllers.
The ISL6227IRZ-T belongs to Renesas' mobile power management product line, engineered specifically for efficient, compact, and thermally robust multi-rail power delivery in portable computing platforms.
FAQ
What is the primary function of the DDR pin on the ISL6227IRZ-T?
The DDR pin on the ISL6227IRZ-T selects between dual independent buck operation (DDR = low) and full DDR memory power solution mode (DDR = high). When high, it reconfigures Channel 2 to track VDDQ/2, enables VDDQ/2 buffered reference output on PG2/REF, and adjusts channel phase alignment based on VIN voltage - all essential for DDR1/DDR2 compliance. This mode is fundamental to the ISL6227IRZ-T's system-level value in notebook memory power design.
Does the ISL6227IRZ-T support both sourcing and sinking current on its VTT output?
Yes, the ISL6227IRZ-T supports bidirectional current on its VTT output (Channel 2 in DDR mode). When configured with DDR = high, CH2 actively sources and sinks current to maintain precise VDDQ/2 tracking during DDR bus transitions - a requirement for DDR2 termination. This capability is explicitly confirmed in the datasheet's Functional Pin Description and Typical Application Circuit (Figure 32), distinguishing ISL6227IRZ-T from unidirectional alternatives.
How does the ISL6227IRZ-T achieve high efficiency across load ranges?
The ISL6227IRZ-T achieves high efficiency through automatic mode transition: fixed 300kHz PWM at heavy loads and hysteretic diode-emulation at light loads. Diode emulation disables the low-side MOSFET during inductor current zero-crossing, eliminating reverse recovery losses. Combined with rDS(ON) current sensing and voltage feed-forward control, this delivers >90% efficiency at 100mA and >88% at 5A - verified in Figures 1–2 of the ISL6227IRZ-T datasheet.
What package type and thermal characteristics does the ISL6227IRZ-T use?
The ISL6227IRZ-T uses a Pb-free 28-pin QFN package (5mm × 5mm, L28.5x5) with exposed thermal pad. Its thermal resistance is θJA = 36°C/W and θJC = 6°C/W, enabling higher power density than the QSOP variant (θJA = 80°C/W). This package supports reliable operation up to +100°C ambient and is qualified for reflow per JEDEC J-STD-020, making it suitable for thermally demanding mobile applications.
Can the ISL6227IRZ-T operate from a 3.3V system rail?
Yes, the ISL6227IRZ-T can operate from a 3.3V or 5V system rail in addition to its primary 5V–28V battery-input range. The datasheet states "Operates From an Input Battery Voltage Range of 5V to 28V or From 3.3V/5V System Rail", and VCC is internally regulated to 5V ±5%. This dual-input capability allows flexible integration in hybrid power architectures where regulated system rails coexist with raw battery inputs - a key feature confirmed in the Applications section and Absolute Maximum Ratings table.
ISL6227IRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- 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-QFN (5x5)
ISL6227IRZ-T FAQ
1.How can I place an order for ISL6227IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6227IRZ-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 ISL6227IRZ-T reliable?
The price and inventory of ISL6227IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6227IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6227IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6227IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6227IRZ-T?
ISL6227IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6227IRZ-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 ISL6227IRZ-T?
For technical support, including ISL6227IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6227IRZ-T requirements.
6.How does Aetrix verify that ISL6227IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6227IRZ-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 ISL6227IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6227IRZ-T?
All ISL6227IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6227IRZ-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 ISL6227IRZ-T part is unused and in its original packaging.
Return procedure for ISL6227IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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