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Renesas ISL6227HRZ-T
- Part No.:
- ISL6227HRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
ISL6227HRZ-T.pdf
- Description:
- IC REG CTRLR DDR 2OUT 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,727
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Product details
Overview
ISL6227HRZ-T from Renesas (formerly Intersil) is a dual-channel synchronous buck PWM controller optimized for DDR memory and chipset power in notebook PCs. It delivers two independently adjustable outputs (0.9V–5.5V), supports DDR mode with VTT tracking VDDQ/2 and buffered VREF, operates from 5V–28V input, and features automatic PWM/hysteretic mode transition for high efficiency across load ranges.
For engineers reviewing the ISL6227HRZ-T datasheet, ISL6227HRZ-T pinout, ISL6227HRZ-T application, or ISL6227HRZ-T equivalent, this page provides verified technical context, confirmed pin functions, real-world DDR and dual-rail use cases, and validated alternative options for notebook power design.
Technical Context
The ISL6227HRZ-T integrates two current-mode PWM controllers with voltage feed-forward ramp modulation, enabling fast transient response and simplified LC filter design. Each channel supports independent soft-start, PGOOD monitoring, and rDS(ON)-based current sensing with optional external sense resistors.
In DDR mode (DDR pin high), Channel 2 dynamically tracks VDDQ/2, sources/sinks current for termination, and delivers a buffered 1.25V reference via PG2/REF - all while phase alignment (0°/90°/180°) is auto-selected based on VIN voltage and DDR state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.0V to 28.0V - enables direct regulation from Li-ion battery or AC/DC adapter without pre-regulation. |
| Output Voltage Range | 0.9V to 5.5V per channel - supports DDR1/DDR2 VDDQ (1.8V–2.5V), chipset rails, and graphics core supplies. |
| PWM Switching Frequency | 300kHz (±15%) - fixed-frequency operation ensures predictable EMI and simplifies filter design. |
| DDR Mode Functions | VTT tracks VDDQ/2 with bidirectional current capability; PG2/REF outputs buffered VDDQ/2 reference up to 10mA. |
| Protection Features | OVP (115% set point), UVP (75% set point), adjustable OCP via OCSET pins, and independent PGOOD per channel. |
| Package & Thermal | 28-pin QFN (5mm × 5mm, exposed pad); θJA = 36°C/W - supports high-power density notebook PCB layouts. |
| Operating Temperature | –10°C to +100°C ambient - qualified for commercial-grade mobile computing environments. |
Pinout & Package
ISL6227HRZ-T uses a 28-lead Pb-free QFN package (5mm × 5mm, L28.5x5) with exposed thermal pad for enhanced power dissipation in space-constrained notebook applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Channel enable inputs | Independent logic-level control (2.0V min high) to start/stop each buck converter; both low disables IC. |
| VSEN1 / VSEN2 | Feedback voltage inputs | Monitor output via resistor divider; used for regulation, PGOOD, OVP, and UVP detection. |
| ISEN1 / ISEN2 | Current sense inputs | Measure rDS(ON) voltage drop of lower MOSFETs for OCP; supports external sense resistors for precision. |
| UGATE1 / UGATE2 | Upper gate drivers | Drive high-side N-MOSFET gates with 4Ω pull-up / 2.3Ω pull-down (typ) at VCC = 5V. |
| LGATE1 / LGATE2 | Lower gate drivers | Drive low-side N-MOSFET gates with 4Ω pull-up / 1.1Ω pull-down (typ) at VCC = 5V. |
| PHASE1 / PHASE2 | Switch node connections | Connect to source of upper MOSFET, drain of lower MOSFET, and inductor - critical for layout EMI control. |
| DDR | Mode selection input | High = DDR mode (VTT tracking + VREF generation); Low = dual independent buck controller. |
| PG2/REF | Multi-function pin | In DDR mode: buffered VDDQ/2 output (10mA sink/source); in dual mode: open-drain PGOOD2 signal. |
| OCSET1 / OCSET2 | Overcurrent threshold set | Resistor-to-ground sets OCP threshold; OCSET2 becomes VDDQ/2 tracking input in DDR mode. |
| SOFT1 / SOFT2 | Soft-start timing inputs | Internal 4.5µA current charges external capacitor; controls ramp rate and prevents inrush current. |
| VIN | Feed-forward input | Sets PWM ramp amplitude and determines channel phase shift (0°/90°/180°) in DDR mode based on voltage level. |
| PG1 | Power-good indicator | Open-drain output active-low when CH1 output is outside ±11% to +15% of set point. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic + PWM hybrid mode | Automatic light-load diode emulation improves efficiency >15% at 100mA vs forced PWM, extending battery life. |
| rDS(ON) current sensing | Eliminates external sense resistor losses and board area; supports optional precision resistor for tighter OCP tolerance. |
| VDDQ/2 tracking & buffering | CH2 regulates VTT to match VDDQ/2 with ±1% accuracy and delivers 10mA buffered reference for DDR memory interface. |
| Phase-shifted PWM operation | 0°/90°/180° inter-channel phase alignment reduces input ripple current by up to 70%, easing input capacitor sizing. |
| Integrated protection suite | Per-channel OVP, UVP, OCP, and PGOOD with latch-off behavior - eliminates need for external supervisor ICs. |
Applications
| DDR Memory Power Supply | Notebook Graphics Core Supply |
|---|---|
|
Use Scenario: Providing VDDQ (2.5V), VTT (1.25V), and VREF (1.25V) to DDR2 SDRAM in ultra-thin notebooks. IC Role / Device Role / Timing Role: Dual-channel controller operating in DDR mode; CH1 regulates VDDQ, CH2 tracks VDDQ/2 as VTT and buffers VREF. Use Value: Single-chip solution eliminates discrete op-amps and tracking circuits, reducing BOM count by 4+ components and PCB area by >25mm². |
Use Scenario: Delivering stable 1.2V/3A to GPU core in convertible tablet PCs with dynamic load steps. IC Role / Device Role / Timing Role: Independent CH2 buck controller with 300kHz PWM and adaptive dead-time control for fast transient response. Use Value: Achieves <1% output deviation during 0→3A load step (Figure 7), meeting GPU voltage tolerance specs without external compensation. |
| Chipset I/O Rail Regulation | Dual-Rail System Power |
|
Use Scenario: Generating 1.8V/2A for northbridge I/O and 3.3V/1.5A for southbridge interfaces in desknote platforms. IC Role / Device Role / Timing Role: Dual independent buck controller with separate EN1/EN2 and VSEN feedback paths. Use Value: Enables staggered power-up sequencing and independent fault isolation - preventing single-point failure from disabling entire chipset. |
Use Scenario: Powering main system rail (5V) and auxiliary rail (3.3V) from shared 19.5V adapter in business-class notebooks. IC Role / Device Role / Timing Role: Two-channel regulator with 180° phase shift to minimize input capacitor RMS current and heat rise. Use Value: Reduces input ripple current by 65% vs in-phase operation (per Figure 31 analysis), allowing smaller 220µF input caps instead of 470µF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT8205AZSP | Single-chip dual controller with integrated MOSFETs (30V/5A); no DDR-specific VTT/VREF functions. | Targets cost-sensitive embedded systems; lacks VTT sourcing/sinking and buffered reference required for DDR compliance. | Choose RT8205AZSP only for non-DDR applications where integration and footprint reduction outweigh missing DDR features. |
| TPS51220ARUKT | TI dual controller with DDR2/3 support, 300kHz PWM, and VTT tracking; requires external VREF buffer for DDR memory. | Supports DDR2/3 but does not integrate VREF buffer - needs external op-amp and resistor network to meet JEDEC spec. | Choose TPS51220ARUKT when DDR3 migration path is needed and board space allows added passive components for VREF. |
Compared with RT8205AZSP and TPS51220ARUKT, the ISL6227HRZ-T uniquely integrates full DDR2-compliant VTT regulation *and* buffered VREF in one QFN package - eliminating four external components and ensuring JEDEC-specified tracking accuracy without design iteration.
Availability
ISL6227HRZ-T is available at Aetrix Electronics and suitable for notebook PC power design, DDR memory subsystems, and mobile chipset regulation requiring stable component supply and long-term industrial availability.
Supply support for ISL6227HRZ-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.
The ISL6227HRZ-T belongs to Renesas' mobile power management product line, designed specifically for efficient, compact, and feature-rich DC/DC regulation in space- and battery-life-constrained portable computing platforms.
FAQ
What is the primary function of the DDR pin on the ISL6227HRZ-T?
The DDR pin configures the ISL6227HRZ-T's operational mode: when pulled high, it enables DDR-specific functionality including VTT tracking of VDDQ/2 and buffered VREF output on PG2/REF; when low, the device operates as two independent buck controllers. This pin directly controls internal signal routing and error amplifier reference selection - no external configuration is required beyond the logic level.
Does the ISL6227HRZ-T support both DDR1 and DDR2 memory standards?
Yes, the ISL6227HRZ-T supports both DDR1 and DDR2 memory power requirements. Its VTT tracking accuracy (±1%), bidirectional current capability (±10mA), and buffered VREF output meet JEDEC specifications for DDR1 (2.5V VDDQ) and DDR2 (1.8V VDDQ). The datasheet explicitly lists "Complete DDR1 and DDR2 Memory Power Solution" as a key feature.
How does the ISL6227HRZ-T achieve high efficiency at light loads?
The ISL6227HRZ-T achieves high light-load efficiency through automatic hysteretic (HYS) mode operation, which disables switching when output current falls below the discontinuous conduction threshold. In HYS mode, the lower MOSFET is used for diode emulation - eliminating reverse recovery losses and reducing gate drive energy. Efficiency gains exceed 15% at 100mA versus forced PWM mode (Figure 1).
Can the ISL6227HRZ-T be used without external current sense resistors?
Yes, the ISL6227HRZ-T is designed for rDS(ON) current sensing by default: ISEN1 and ISEN2 monitor the voltage drop across the lower MOSFET's on-resistance for overcurrent protection and current-mode control. External sense resistors are optional and only needed when higher OCP accuracy or programmability is required - they connect between ISENx and PGNDx.
What thermal performance can be expected from the ISL6227HRZ-T in a typical notebook layout?
In a standard 4-layer notebook PCB with 1-in² copper pour under the exposed pad, the ISL6227HRZ-T achieves θJA = 36°C/W (typical). At 5W total dissipation (both channels), junction temperature rise is ~180°C above ambient - well within the +125°C max rating when ambient stays ≤70°C. Thermal derating is recommended above 85°C ambient per Figure 5 data.
ISL6227HRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Controller, DDR
- Voltage - Input:
- 5V ~ 28V
- Number of Outputs:
- 2
- Voltage - Output:
- 0.9V ~ 5.5V
- Operating Temperature:
- -10°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (5x5)
ISL6227HRZ-T FAQ
1.How can I place an order for ISL6227HRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6227HRZ-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 ISL6227HRZ-T reliable?
The price and inventory of ISL6227HRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6227HRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6227HRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6227HRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6227HRZ-T?
ISL6227HRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6227HRZ-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 ISL6227HRZ-T?
For technical support, including ISL6227HRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6227HRZ-T requirements.
6.How does Aetrix verify that ISL6227HRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6227HRZ-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 ISL6227HRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6227HRZ-T?
All ISL6227HRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6227HRZ-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 ISL6227HRZ-T part is unused and in its original packaging.
Return procedure for ISL6227HRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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