My Inquiry
My Account
Renesas ISL6227IRZ
- Part No.:
- ISL6227IRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
ISL6227IRZ.pdf
- Description:
- IC REG CTRLR DDR 2OUT 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,082
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL6227IRZ from Renesas (formerly Intersil) is a dual-channel synchronous buck PWM controller optimized for notebook PC power systems, delivering precision regulation for DDR memory (VDDQ/VTT), chipsets, and graphics subsystems. It supports input voltages from 5V to 28V, provides 0.9V–5.5V programmable outputs, operates at 300kHz PWM or hysteretic mode, and integrates VDDQ/2 tracking and buffered reference generation in DDR mode.
For engineers reviewing the ISL6227IRZ datasheet, ISL6227IRZ pinout, ISL6227IRZ application, or ISL6227IRZ equivalent, this device is selected for high-efficiency dual-rail DC/DC conversion in space-constrained mobile platforms where dynamic load response, light-load efficiency, and DDR-compliant voltage tracking are critical design requirements.
Technical Context
The ISL6227IRZ implements current-mode control with voltage feed-forward ramp modulation, enabling fast transient response across wide LC filter selections and robust rejection of input voltage variation. Its dual-loop architecture supports independent soft-start, PGOOD monitoring, and adaptive dead-time control per channel.
In DDR mode, CH2 (VTT) actively sources and sinks current while tracking CH1 (VDDQ)/2 with ±1% accuracy; the PG2/REF pin delivers a buffered 1.25V reference capable of sourcing 10mA. Phase shift between channels is dynamically set to 0°, 90°, or 180° based on VIN voltage and DDR pin state.
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 intermediate pre-regulation. |
| Output Voltage Range | 0.9V to 5.5V - supports DDR1/DDR2 VDDQ, chipset core, and I/O rails via external resistor dividers on VSEN pins. |
| PWM Switching Frequency | 300kHz (±15%) - fixed-frequency operation ensures predictable EMI profile and simplifies filter design. |
| VDDQ/2 Tracking Accuracy | ±1% over temperature - guarantees compliant DDR termination voltage under varying load and thermal conditions. |
| rDS(ON) Current Sensing | Uses lower MOSFET's on-resistance - eliminates need for external sense resistors, reducing BOM cost and PCB area. |
| Protection Features | OVP (115% set point), UVP (75% set point), OCP (adjustable via OCSET pins), and UVLO on VCC - ensures system-level fault resilience without external supervision. |
| Package | 28-pin QFN (5mm × 5mm, exposed pad) - RoHS-compliant, Pb-free, with θJA = 36°C/W for thermally demanding mobile applications. |
Pinout & Package
ISL6227IRZ is housed in a 28-lead QFN package (5mm × 5mm, L28.5x5 drawing) with an exposed thermal pad for enhanced heat dissipation in high-current notebook power stages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Channel enable inputs | Independent logic-level control (2.0V min high, 0.8V max low) allows staggered startup or channel disable for power sequencing. |
| VSEN1 / VSEN2 | Feedback voltage sensing inputs | High-impedance (80nA bias) nodes connected to resistor dividers - set output voltage and serve as reference for PGOOD, OVP, and UVP detection. |
| PG1 / PG2/REF | Power-good indicator / DDR reference output | Open-drain PG1 asserts when CH1 is within ±11%/+15% window; in DDR mode, PG2/REF becomes a 10mA-capable VDDQ/2 buffer. |
| ISEN1 / ISEN2 | Current-sense inputs | Monitor voltage drop across lower MOSFET rDS(ON); support optional external sense resistors for higher precision OCP. |
| OCSET1 / OCSET2 | Overcurrent threshold programming | Resistor-to-ground sets trip point; OCSET2 serves as VDDQ/2 tracking node in DDR mode instead of OCP setting. |
| DDR | Mode selection input | Logic-high configures IC as complete DDR solution (VTT tracking + VREF); logic-low enables independent dual-channel operation. |
| VIN | Feed-forward input & phase-shift control | Sets ramp amplitude for voltage feed-forward; determines channel phase offset (0°, 90°, or 180°) in DDR mode based on voltage level. |
| UGATE1/2, LGATE1/2 | High-side and low-side gate drivers | Integrated drivers with RUP/RDN ≤ 8Ω/4Ω (upper), ≤ 8Ω/3Ω (lower) - drive standard N-channel MOSFETs without external buffers. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic + PWM hybrid mode | Automatic transition between 300kHz CCM and diode-emulation HYS at light loads - extends battery life without sacrificing transient response. |
| VDDQ/2 tracking with sink/source capability | CH2 regulates VTT to exactly half of VDDQ and supplies/sinks current - meets DDR1/DDR2 bidirectional termination requirements. |
| Voltage feed-forward ramp modulation | Ramp gain adjusts with VIN (125mV/V above 4.2V, 250mV/V below) - maintains consistent loop gain across wide input range. |
| Independent soft-start and PGOOD per channel | SOFT1/SOFT2 pins control ramp timing; PG1/PG2 assert only after soft-start completion and regulation validation - enables safe multi-rail sequencing. |
| Programmable phase shift (0°/90°/180°) | Reduces input ripple and inter-channel noise coupling - selectable via VIN voltage and DDR pin state without external components. |
Applications
| DDR Memory Power Supply | Notebook Graphics Core Supply |
|---|---|
|
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 CH1 regulating VDDQ and CH2 tracking VDDQ/2 as VTT while buffering VREF on PG2/REF. Use Value: Eliminates need for discrete tracking LDOs and reference buffers - reduces component count by ≥3 devices and improves tracking accuracy to ±1%. |
Use Scenario: Delivering tightly regulated 1.1V core voltage to GPU with rapid load transients up to 3A/µs. IC Role / Device Role / Timing Role: CH1 configured as standalone 300kHz PWM buck regulator with voltage feed-forward and current-mode control. Use Value: Achieves <1% load regulation and <50mV undershoot on 3A step - meets GPU voltage tolerance specs without external compensation. |
| Chipset I/O Rail Supply | Mobile Platform Dual-Rail System |
|
Use Scenario: Generating 1.8V I/O supply for northbridge/southbridge with simultaneous 5V standby rail management. IC Role / Device Role / Timing Role: CH2 used as independent 1.8V regulator; VIN routed from 5V system rail, DDR pin held low for dual-switcher operation. Use Value: Enables single-chip dual-rail solution with shared gate drivers and protection logic - cuts board area by 35% vs. discrete controllers. |
Use Scenario: Consolidating VDDQ (2.5V) and chipset core (1.05V) into one compact power stage on 6-layer mobile PCB. IC Role / Device Role / Timing Role: CH1 and CH2 independently programmed for different outputs; 180° phase shift minimizes input capacitor RMS current. Use Value: Reduces required input bulk capacitance by 40% and lowers peak input ripple current - extends battery runtime and eases thermal design. |
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 MOSFETs; fixed 500kHz switching; no DDR-specific tracking or VREF buffer. | Targeted at cost-sensitive consumer notebooks; lacks VTT sink capability and VDDQ/2 reference output. | Select when board space is extremely constrained and discrete MOSFETs are undesirable - but verify DDR compliance separately. |
| TPS51220ARUKR | TI dual-channel controller with DDR mode; supports 300kHz/600kHz selectable frequency; includes integrated MOSFET drivers but no rDS(ON) sensing. | Requires external current-sense resistors; offers enhanced thermal shutdown but no VDDQ/2 buffered reference on dedicated pin. | Choose for designs needing higher switching frequency or TI ecosystem compatibility - accept added BOM cost for precision sensing. |
Compared with RT8205AZSP and TPS51220ARUKR, the ISL6227IRZ uniquely combines rDS(ON) current sensing, integrated VDDQ/2 tracking with sink/source, and a dedicated buffered VREF output - making it the only option that satisfies full JEDEC DDR1/DDR2 power architecture requirements in a single IC.
Availability
ISL6227IRZ is available at Aetrix Electronics and suitable for notebook PC motherboard design, DDR memory subsystem integration, and mobile platform power management requiring stable component supply across extended production lifecycles.
Supply support for ISL6227IRZ 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 continues to support its high-performance analog and power management portfolio for computing and industrial applications.
The ISL6227IRZ belongs to Renesas' mobile power controller product line, engineered specifically for efficient, compact, and DDR-compliant voltage regulation in space- and thermal-constrained portable computing systems.
FAQ
What is the maximum input voltage rating for the ISL6227IRZ?
The ISL6227IRZ has an absolute maximum input voltage (VIN) rating of +28.0V. Operation is specified across a recommended range of +5.0V to +28.0V, enabling direct connection to Li-ion battery packs or unregulated adapter outputs. Exceeding 28.0V risks permanent damage to internal circuitry.
How does the ISL6227IRZ implement DDR memory voltage tracking?
In DDR mode (DDR pin high), the ISL6227IRZ configures CH2 to track VDDQ/2 using a resistor divider connected to OCSET2. The PG2/REF pin then buffers this voltage as a stable 1.25V reference capable of sourcing up to 10mA - fulfilling both VTT termination and VREF requirements for DDR1/DDR2 memory interfaces.
Can the ISL6227IRZ operate with only one channel enabled?
Yes. The ISL6227IRZ supports independent channel control via EN1 and EN2 pins. Either channel can be disabled (ENx low) while the other remains active, allowing flexible power sequencing and partial-system operation. When both EN pins are low, the device enters ultra-low leakage shutdown (<1µA ICCSN).
What protection features are integrated into the ISL6227IRZ?
The ISL6227IRZ integrates overvoltage protection (OVP at 115% set point), undervoltage protection (UVP at 75% set point), adjustable overcurrent protection (OCP via OCSET pins), VCC UVLO (4.45V rising threshold), and thermal foldback. All protections are fully autonomous and require no external components to activate.
Does the ISL6227IRZ require external compensation components?
No. The ISL6227IRZ includes internal feedback compensation for both channels, eliminating the need for external Type-II or Type-III compensation networks. This reduces design complexity and component count while maintaining stability across the full operating range of LC filter selections.
ISL6227IRZ 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:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (5x5)
ISL6227IRZ FAQ
1.How can I place an order for ISL6227IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6227IRZ 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 reliable?
The price and inventory of ISL6227IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6227IRZ is usually 5 days.
3.What payment methods are accepted for ISL6227IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6227IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6227IRZ?
ISL6227IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6227IRZ 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?
For technical support, including ISL6227IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6227IRZ requirements.
6.How does Aetrix verify that ISL6227IRZ is sourced from the original manufacturer or authorized distributors?
All ISL6227IRZ 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 meets industry standards.
7.What is the process for return or replacement of ISL6227IRZ?
All ISL6227IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6227IRZ, 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 part is unused and in its original packaging.
Return procedure for ISL6227IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL6227IRZ Tags
-
TPS51206DSQR
Texas Instruments
-
TPS51200DRCR
Texas Instruments
-
TPS51200DRCT
Texas Instruments
-
TPS62740DSSR
Texas Instruments
-
TPS51100DGQR
Texas Instruments
-
NCP51200MNTXG
onsemi
-
NCP51400MNTXG
onsemi
-
RT9026GSP
Richtek USA Inc.
-
LP2998MRX/NOPB
Texas Instruments
-
TPS51200QDRCRQ1
Texas Instruments
-
DPA423GN-TL
Power Integrations
-
LM10011SD/NOPB
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
