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Renesas ISL6225CAZA
- Part No.:
- ISL6225CAZA
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ISL6225CAZA.pdf
- Description:
- IC REG CTRL DDR DRAM 2OUT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,187
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Product details
Overview
ISL6225CAZA from Renesas (formerly Intersil) is a dual-channel synchronous buck PWM controller optimized for DDR memory power delivery and dual-output DC/DC conversion in mobile computing systems. It delivers 0.9V–5.5V adjustable outputs, supports DDR mode with VTT tracking and VDDQ/2 reference generation, operates at 300 kHz nominal switching frequency, and features automatic CCM/hysteretic mode selection for high efficiency across load ranges - used in notebook PCs, PDAs, and graphics chipset power supplies.
For engineers reviewing the ISL6225CAZA datasheet, ISL6225CAZA pinout, ISL6225CAZA application, or ISL6225CAZA equivalent, key selection considerations include its dual-channel phase control (0°/90°/180°), MOSFET rDS(ON)-based current sensing, DDR-specific tracking accuracy, PGOOD per channel (or single PGOOD in DDR mode), and Pb-free SSOP-28 package compatibility with SnPb and Pb-free reflow.
Technical Context
The ISL6225CAZA integrates two independent average-current-mode PWM controllers with voltage feed-forward ramp modulation, enabling fast transient response to input and load changes. Each channel uses internal feedback compensation and supports programmable overcurrent protection via OCSET pins.
In DDR mode (DDR pin = high), CH2 output (VTT) tracks CH1 (VDDQ) at VDDQ/2 with sourcing/sinking capability, while PG2/REF becomes a buffered VDDQ/2 reference output. Channel synchronization shifts from 180° (dual supply) to 0° (DDR mode) or 90° (VIN grounded + DDR active) to minimize inter-channel interference and input ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 300 kHz ±15% - fixed-frequency operation ensures predictable EMI profile and simplifies filter design. |
| Output Voltage Range | 0.9V to 5.5V per channel - supports DDR DRAM (1.25V/1.8V), SDRAM, GPU core, and I/O rails. |
| VTT Tracking Accuracy | VTT = VDDQ/2 ±1% - meets JEDEC DDR memory reference voltage tolerance requirements. |
| Current Sensing | rDS(ON)-based with optional external resistor - eliminates sense resistor cost/losses; precision OCP configurable via OCSET pins. |
| Power Good Threshold | ±10% of set point per channel - enables reliable system sequencing and fault detection before downstream logic powers up. |
| Operating Temp Range | –10°C to +85°C - validated for mobile PC and handheld thermal environments without derating. |
| Input Voltage Range | 5V to 24V (battery) or 3.3V/5V system rail - dual-input flexibility supports direct battery and intermediate bus architectures. |
Pinout & Package
ISL6225CAZA is housed in a 28-lead Pb-free SSOP package (M28.15), RoHS-compliant and qualified for both SnPb and Pb-free reflow profiles (MSL level per J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1) | Signal ground reference | Common return for analog and digital circuitry; must be low-impedance connection to PCB ground plane. |
| LGATE1/LGATE2 (2,27) | Lower MOSFET gate drivers | Drive N-channel sync rectifiers; designed for low RDS(ON) MOSFETs with adaptive dead-time control. |
| PGND1/PGND2 (3,26) | Power ground returns | Separate high-current paths for lower MOSFET sources; critical for minimizing noise coupling between channels. |
| PHASE1/PHASE2 (4,25) | Switch node connections | Junction of upper MOSFET source, inductor, and lower MOSFET drain; requires short, low-inductance layout. |
| UGATE1/UGATE2 (5,24) | Upper MOSFET gate drivers | Bootstrap-driven high-side drivers; BOOT pins supply floating bias for UGATE operation. |
| ISEN1/ISEN2 (7,22) | Current sense inputs | Monitor voltage drop across lower MOSFET rDS(ON); supports optional external sense resistor for tighter OCP tolerance. |
| EN1/EN2 (8,21) | Channel enable inputs | Active-high logic; tied together for coordinated startup/shutdown; <0.8V disables, >2.5V enables. |
| VOUT1/VOUT2 (9,20) | Mode control inputs | Connect to output to enable auto CCM/hysteretic transition; ground to force continuous conduction mode. |
| VSEN1/VSEN2 (10,19) | Feedback voltage inputs | Sample resistive divider output; sets regulation point (VREF = 0.9V); used for PGOOD, OVP, UVP monitoring. |
| OCSET1/OCSET2 (11,18) | OCP threshold programming | Resistor-to-ground sets overcurrent trip level; OCSET2 repurposed as VDDQ/2 tracking adjust in DDR mode. |
| SOFT1/SOFT2 (12,17) | Soft-start timing inputs | 5 µA internal current charges external capacitor; controls ramp rate and PGOOD enable timing (1.5V threshold). |
| DDR (13) | DDR mode select | High = enables VTT tracking, VDDQ/2 reference, and 0° phase alignment; low = standard dual-channel operation. |
| VIN (14) | Feed-forward input | Provides input voltage to ramp generator; grounded in dual-step designs to double ramp slew rate and reduce jitter. |
| VCC (28) | Bias supply input | +5V ±5% required; includes UVLO (4.3–4.45V falling, 4.65–4.75V rising) and shutdown current <30 µA. |
| PG1 (15) | CH1 power-good output | Open-drain; pulled low if VOUT1 deviates >±10%; always active, even in DDR mode. |
| PG2/REF (16) | Dual-function pin | In non-DDR mode: PGOOD2 open-drain output; in DDR mode: buffered VDDQ/2 reference (0.99–1.01×VDDQ/2, 10 mA sink/source). |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CCM/hysteretic mode switching | Eliminates light-load efficiency penalty without external control; 8-cycle hysteresis prevents chatter during mode transitions. |
| VTT sourcing/sinking capability | Supports DDR termination bidirectional current flow - essential for data eye integrity during read/write cycles. |
| VDDQ/2 buffered reference output | Delivers stable, low-noise 1.25V (for 2.5V VDDQ) or 0.9V (for 1.8V VDDQ) reference with ±1% accuracy and 10 mA drive. |
| Programmable channel phase shift | 0° (DDR), 90° (low-interference DDR), or 180° (input ripple reduction) - selected automatically based on VIN and DDR state. |
| Integrated feedback compensation | Reduces external components by embedding Type 2 compensation; eliminates need for designer loop tuning in most applications. |
Applications
| Mobile Notebook DDR Power | Graphics Chipset Dual-Rail Supply |
|---|---|
Use Scenario: Powering DDR2/DDR3 memory subsystems in thin-and-light notebooks with battery and adapter input. IC Role / Device Role / Timing Role: Dual-channel controller providing VDDQ (1.8V/2.5V) and actively tracked VTT (VDDQ/2) with sourcing/sinking, plus VREF generation. Use Value: Meets JEDEC DDR voltage accuracy and transient response specs while maximizing battery runtime via hysteretic light-load operation. | Use Scenario: Delivering independent, tightly regulated core (0.9–1.3V) and I/O (1.8–3.3V) voltages to discrete GPUs or integrated graphics processors. IC Role / Device Role / Timing Role: Dual synchronous buck controller with independent soft-start, PGOOD, and OCP per rail - enables safe, sequenced GPU power-up. Use Value: Eliminates need for two separate controllers; 180° phase shift reduces input capacitor RMS current by ~30% versus in-phase operation. |
| Sub-notebook System Power | Handheld Instrument Dual Output |
Use Scenario: Compact power solution for sub-notebooks where board space and thermal dissipation are constrained. IC Role / Device Role / Timing Role: Single-chip dual-output regulator replacing discrete solutions; supports FCCM forcing for noise-sensitive analog sections. Use Value: Reduces BOM count and PCB area vs. dual discrete controllers; VOUT pin flexibility allows deterministic mode selection per rail. | Use Scenario: Portable test equipment requiring isolated, stable 3.3V logic and 1.2V sensor interface rails from a shared Li-ion battery input. IC Role / Device Role / Timing Role: Dual-channel buck controller with independent EN pins and PGOOD signals for modular power domain control. Use Value: Enables independent rail enable/disable and fault reporting - critical for instrument self-test and calibration sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6227 | Successor with enhanced thermal performance, improved light-load efficiency, and updated DDR timing compliance; same SSOP-28 footprint. | Recommended for new designs targeting DDR2/DDR3; supports higher switching frequencies and tighter VTT regulation. | Select ISL6227 when designing new platforms requiring extended lifecycle support and improved efficiency at ultra-low loads. |
| RT8205A | Single-chip dual PWM with integrated MOSFET drivers but no DDR-specific tracking or VREF buffer; 500 kHz max frequency. | Suitable for generic dual-rail applications (e.g., CPU + I/O), not DDR memory systems requiring VTT sourcing/sinking. | Choose RT8205A only for cost-sensitive, non-DDR applications where VDDQ/2 reference and bidirectional VTT are unnecessary. |
Compared with ISL6225CAZA, ISL6227 offers higher reliability and DDR compliance for new designs, while RT8205A provides lower-cost dual-rail control without DDR-specific functions - making ISL6225CAZA the precise fit for legacy DDR memory power where its tracking accuracy and reference buffering are mandatory.
Availability
ISL6225CAZA is available at Aetrix Electronics and suitable for mobile PC power management, DDR memory subsystems, and graphics chipset dual-rail applications requiring stable component supply and long-term industrial availability.
Supply support for ISL6225CAZA 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 Corporation (acquired Intersil in 2017) is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and computing markets.
The ISL6225CAZA belongs to Renesas' mobile power management product line, engineered specifically for high-efficiency, multi-rail DC/DC conversion in space-constrained portable computing platforms with DDR memory interfaces.
FAQ
What is the primary function of the DDR pin on the ISL6225CAZA?
The DDR pin on the ISL6225CAZA selects DDR memory power mode when driven high. In this mode, CH2 (VTT) tracks CH1 (VDDQ) at exactly VDDQ/2, PG2/REF becomes a buffered VDDQ/2 reference output, and channel phase shifts to 0° to minimize interference. The ISL6225CAZA thus transforms from a generic dual PWM controller into a complete, JEDEC-compliant DDR power solution - a function not available in standard dual-rail configurations.
Does the ISL6225CAZA require an external current sense resistor?
No, the ISL6225CAZA does not require an external current sense resistor. It uses the lower MOSFET's rDS(ON) as the current-sensing element for overcurrent protection and average current mode control. However, an external resistor can be added at ISEN1/ISEN2 for higher-precision OCP - the ISL6225CAZA supports both methods without hardware change.
How does the ISL6225CAZA handle light-load efficiency?
The ISL6225CAZA improves light-load efficiency by automatically switching each channel from constant-frequency continuous conduction mode (CCM) to variable-frequency hysteretic mode with diode emulation. This transition occurs when inductor current falls below the critical value, reducing switching losses and MOSFET conduction losses. The ISL6225CAZA implements 8-cycle hysteresis to prevent mode chatter and ensures smooth transitions using VOUT pin feedback.
What are the valid input voltage sources for the ISL6225CAZA?
The ISL6225CAZA accepts two distinct input configurations: (1) direct battery input from 5V to 24V via the VIN pin, or (2) regulated 3.3V or 5V system rail input. In both cases, the IC is biased from a dedicated +5V VCC supply. When operating from low-voltage rails, grounding VIN doubles the feed-forward ramp slope - improving noise immunity and duty-cycle stability in the ISL6225CAZA.
Can the ISL6225CAZA operate with only one channel enabled?
Yes, the ISL6225CAZA supports single-channel operation. EN1 and EN2 are independent logic inputs; driving EN1 high and EN2 low enables only CH1, while both high activates dual-channel mode. In single-channel use, CH2 circuitry remains inactive, reducing quiescent current. All protections, soft-start, and PGOOD functions remain fully operational for the enabled channel - the ISL6225CAZA maintains full functionality regardless of channel count.
ISL6225CAZA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Controller, DDR DRAM, SDRAM
- Voltage - Input:
- 5V ~ 24V
- Number of Outputs:
- 2
- Voltage - Output:
- 0.9V ~ 5.5V
- Operating Temperature:
- -10°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP/QSOP
ISL6225CAZA FAQ
1.How can I place an order for ISL6225CAZA through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6225CAZA 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 ISL6225CAZA reliable?
The price and inventory of ISL6225CAZA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6225CAZA is usually 5 days.
3.What payment methods are accepted for ISL6225CAZA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6225CAZA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6225CAZA?
ISL6225CAZA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6225CAZA 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 ISL6225CAZA?
For technical support, including ISL6225CAZA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6225CAZA requirements.
6.How does Aetrix verify that ISL6225CAZA is sourced from the original manufacturer or authorized distributors?
All ISL6225CAZA 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 ISL6225CAZA meets industry standards.
7.What is the process for return or replacement of ISL6225CAZA?
All ISL6225CAZA units undergo pre-shipment inspection (PSI). If there is an issue with ISL6225CAZA, 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 ISL6225CAZA part is unused and in its original packaging.
Return procedure for ISL6225CAZA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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