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Renesas ISL6227HRZ
- Part No.:
- ISL6227HRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
ISL6227HRZ.pdf
- Description:
- IC REG CTRLR DDR 2OUT 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,044
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Product details
Overview
ISL6227HRZ from 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) or operates in DDR mode with VTT tracking VDDQ/2 and buffered VREF generation. Features include 300kHz fixed-frequency PWM, hysteretic diode-emulation light-load mode, rDS(ON) current sensing, and input voltage feed-forward control - enabling high-efficiency regulation directly from 5V–28V battery or adapter inputs.
For engineers reviewing the ISL6227HRZ datasheet, ISL6227HRZ pinout, ISL6227HRZ application, or ISL6227HRZ equivalent, this device supports critical mobile power design tasks: dual-output notebook rail generation, DDR1/DDR2 termination supply with bidirectional VTT sourcing/sinking, and robust protection including OVP (115%), UVP (75%), and channel-specific PGOOD monitoring.
Technical Context
The ISL6227HRZ 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 ranges (5V–28V). Each channel supports automatic CCM/HYS mode transition based on load, with configurable phase shift (0°/90°/180°) determined by VIN and DDR pin state.
In DDR mode (DDR = HIGH), CH2 transforms into a precision VTT tracker with VTT = VDDQ/2 ±0.5%, while PG2/REF becomes a buffered 1.25V reference output capable of sourcing 10mA. The architecture uses internal 0.9V reference, rDS(ON)-based current sensing, and adaptive dead-time control to optimize efficiency and stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 28V - enables direct regulation from Li-ion battery packs or AC/DC adapters without pre-regulation. |
| Output Voltage Range | 0.9V to 5.5V per channel - supports DDR VDDQ (1.8V/2.5V), chipset rails, and graphics core supplies. |
| PWM Switching Frequency | 300kHz (±15%) - fixed-frequency operation ensures predictable EMI profile and simplifies filter design. |
| VTT Tracking Accuracy | VTT = VDDQ/2 ±0.5% - meets DDR1/DDR2 termination voltage tolerance requirements for signal integrity. |
| Overvoltage Protection | 115% of set point - clamps output by holding lower MOSFET ON, preventing damage to downstream DDR ICs. |
| Undervoltage Lockout | 75% of set point - latches channel OFF during brownout, ensuring clean reset behavior in low-battery conditions. |
| Thermal Resistance (θJA) | 36°C/W - QFN-28 package enables high-power density designs with minimal heatsinking in space-constrained notebooks. |
Pinout & Package
ISL6227HRZ is housed in a Pb-free, RoHS-compliant 28-pin QFN package (5mm × 5mm, L28.5x5), featuring an exposed thermal pad for enhanced heat dissipation in high-current notebook power applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Channel enable inputs | Independent logic-level control (2.0V HIGH, 0.8V LOW) allows staggered startup or dynamic channel disable for power sequencing. |
| VSEN1 / VSEN2 | Feedback voltage sense inputs | High-impedance (80nA bias) inputs monitor resistive divider output to regulate VOUT1/VOUT2 with ±1% reference accuracy. |
| ISEN1 / ISEN2 | Current sense inputs | Monitor rDS(ON) voltage drop across lower MOSFETs for OCP; supports external sense resistor for higher precision. |
| UGATE1 / UGATE2 | Upper gate drivers | Low-impedance (4Ω pull-up / 2.3Ω pull-down) outputs drive N-channel high-side MOSFETs in synchronous buck topology. |
| LGATE1 / LGATE2 | Lower gate drivers | Optimized for fast turn-on/turn-off (1.1Ω pull-down) to minimize conduction loss and body-diode conduction in DCM. |
| PG1 / PG2/REF | Power-good / DDR reference | Open-drain PG1 asserts when CH1 is in regulation; in DDR mode, PG2/REF outputs buffered VDDQ/2 (1.25V @ 10mA). |
| DDR | Mode selection input | Logic HIGH configures CH2 as VTT tracker with VDDQ/2 reference; logic LOW enables independent dual-channel operation. |
| VIN | Feed-forward input | Sets PWM ramp amplitude and determines channel phase shift (0°/90°/180°) in DDR mode based on voltage level (>4.2V = 90°). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent or DDR-configurable outputs | Enables single-chip solution for both generic dual-rail systems and DDR memory power with VTT + VREF compliance. |
| Hysteretic diode-emulation at light load | Reduces switching losses and extends battery life in notebook standby/idle states without compromising transient response. |
| rDS(ON) current sensing | Eliminates external sense resistor, lowering BOM cost and PCB area while maintaining accurate overcurrent protection. |
| Voltage feed-forward + current-mode control | Provides inherent input-line rejection and stable loop compensation across wide input/output voltage and LC combinations. |
| Programmable channel phase shift | Minimizes input ripple current and inter-channel noise coupling via 0°/90°/180° synchronization controlled by VIN and DDR pin. |
Applications
| DDR Memory Power Supply | Notebook CPU/GPU Core Rail |
|---|---|
Use Scenario: Providing VDDQ, VTT, and VREF for DDR2 SODIMM modules in ultraportable notebooks. IC Role / Device Role / Timing Role: Dual-channel controller operating in DDR mode: CH1 regulates VDDQ (2.5V), CH2 sources/sinks VTT (1.25V) while PG2/REF delivers buffered VREF. Use Value: Meets JEDEC DDR2 termination spec (VTT = VDDQ/2 ±0.5%) with integrated tracking and 10mA reference drive - eliminating discrete op-amps and reducing layout complexity. |
Use Scenario: Generating 1.2V core voltage for Intel Pentium M or AMD Mobile Athlon processors. IC Role / Device Role / Timing Role: CH1 configured as primary high-current buck regulator (up to 5A), CH2 supplies auxiliary 3.3V I/O rail with independent soft-start. Use Value: 300kHz fixed-frequency PWM ensures predictable EMI filtering; rDS(ON) sensing reduces component count versus resistor-based current monitoring. |
| Chipset Power Management | Graphics Interface Power |
Use Scenario: Delivering 1.5V and 1.8V rails to Intel 915GM/PM or NVIDIA nForce chipsets in sub-notebooks. IC Role / Device Role / Timing Role: Independent dual-channel operation with 180° phase shift minimizes input capacitor stress and improves thermal distribution across PCB. Use Value: Input voltage feed-forward enables stable regulation across 5V–28V battery range; undervoltage lockout prevents erratic chipset behavior during battery sag. |
Use Scenario: Powering PCI Express graphics interface (1.5V) and display controller (1.8V) in convertible tablets. IC Role / Device Role / Timing Role: CH1 and CH2 operate in forced PWM mode (VOUTx grounded) for constant-frequency noise control in EMI-sensitive RF zones. Use Value: Adjustable OCP via OCSET pins allows precise current limiting per rail; PGOOD signals enable sequenced GPU initialization and fault reporting. |
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 |
|---|---|---|---|
| ISL6227IRZ | Same functionality and pinout, but rated for -40°C to +100°C industrial temperature range vs. ISL6227HRZ's -10°C to +100°C. | Required for extended-temperature notebook designs (e.g., ruggedized or automotive-adjacent embedded systems). | Select ISL6227IRZ when operation below -10°C is required; otherwise ISL6227HRZ is optimal for standard commercial notebooks. |
| RT8205AZSP | Single-chip dual-phase controller with integrated MOSFET drivers but no DDR-specific VTT/VREF functions; lacks VDDQ/2 tracking and buffered reference output. | Suitable for generic dual-output DC/DC but cannot replace ISL6227HRZ in DDR memory power applications without external circuitry. | Choose RT8205AZSP only for non-DDR dual-rail systems where cost and integration outweigh DDR feature requirements. |
Compared with ISL6227IRZ, ISL6227HRZ offers identical electrical performance at lower cost for commercial-temperature notebooks; compared with RT8205AZSP, ISL6227HRZ provides dedicated DDR compliance features - VTT tracking, VREF buffering, and DDR-mode phase control - that eliminate external components and ensure JEDEC compliance.
Availability
ISL6227HRZ is available at Aetrix Electronics and suitable for notebook PC power management, DDR memory subsystems, and mobile chipset regulation requiring stable component supply and long-term lifecycle support.
Supply support for ISL6227HRZ 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
Intersil (now part of Renesas Electronics) is a semiconductor company specializing in high-performance analog and power management ICs for computing, communications, and industrial markets.
The ISL6227HRZ belongs to Intersil's mobile power management product line, designed specifically to address the stringent efficiency, size, and DDR compliance requirements of thin-and-light notebook PCs and tablet platforms.
FAQ
What is the operating temperature range of the ISL6227HRZ?
The ISL6227HRZ is specified for an ambient temperature range of -10°C to +100°C, with a junction temperature limit of +125°C. Its QFN-28 package (θJA = 36°C/W) supports reliable thermal performance in compact notebook power stages without forced airflow. This range aligns with commercial-grade mobile computing applications, distinguishing it from the industrial-grade ISL6227IRZ (-40°C to +100°C).
How does the ISL6227HRZ implement DDR memory power compliance?
The ISL6227HRZ implements DDR compliance by enabling DDR mode via the DDR pin. In this mode, CH2 regulates VTT to precisely track VDDQ/2 (±0.5%), while the PG2/REF pin delivers a buffered VDDQ/2 reference voltage (e.g., 1.25V for 2.5V VDDQ) capable of sourcing up to 10mA. This eliminates need for external op-amps or discrete regulators in DDR1/DDR2 memory power designs.
Can the ISL6227HRZ operate with only one channel enabled?
Yes - the ISL6227HRZ supports independent channel control via EN1 and EN2 pins. Either channel can be disabled (ENx < 0.8V) while the other remains active, allowing flexible power sequencing, dynamic rail shutdown, or partial-system operation. When both EN pins are low, the device enters ultra-low-quiescent shutdown (ICCSN ≤ 1µA), preserving battery life in deep-sleep states.
What protection features does the ISL6227HRZ provide?
The ISL6227HRZ integrates comprehensive protection: overvoltage protection (OVP) triggers at 115% of set point by holding the lower MOSFET ON; undervoltage protection (UVP) latches the channel OFF below 75% of set point; and adjustable overcurrent protection (OCP) monitors ISENx voltage. Each channel also has independent PGOOD monitoring with 84–92% lower and 110–120% upper thresholds.
Does the ISL6227HRZ require external compensation components?
No - the ISL6227HRZ includes internal feedback compensation for both channels, significantly reducing external component count. Its voltage feed-forward + current-mode architecture stabilizes the control loop across wide input/output voltage and LC filter variations, eliminating the need for external Type-II or Type-III compensation networks typically required in voltage-mode controllers.
ISL6227HRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ISL6227HRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6227HRZ 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 reliable?
The price and inventory of ISL6227HRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6227HRZ is usually 5 days.
3.What payment methods are accepted for ISL6227HRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6227HRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6227HRZ?
ISL6227HRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6227HRZ 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?
For technical support, including ISL6227HRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6227HRZ requirements.
6.How does Aetrix verify that ISL6227HRZ is sourced from the original manufacturer or authorized distributors?
All ISL6227HRZ 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 meets industry standards.
7.What is the process for return or replacement of ISL6227HRZ?
All ISL6227HRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6227HRZ, 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 part is unused and in its original packaging.
Return procedure for ISL6227HRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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