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Renesas ISL6225CAZ
- Part No.:
- ISL6225CAZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ISL6225CAZ.pdf
- Description:
- IC REG CTRL DDR DRAM 2OUT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,793
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Product details
Overview
ISL6225CAZ from 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 (VDDQ/2), provides independent PGOOD signals per channel, and operates at 300 kHz with 0°/90°/180° phase-shifted PWM for input ripple reduction - deployed in notebook PCs, PDAs, and graphic chipset power rails.
For engineers reviewing the ISL6225CAZ datasheet, ISL6225CAZ pinout, ISL6225CAZ application, or ISL6225CAZ equivalent, key selection criteria include its dual-mode operation (CCM/hysteretic), MOSFET rDS(ON)-based current sensing, DDR-specific VREF generation, and SSOP-28 package compatibility with legacy mobile power designs.
Technical Context
The ISL6225CAZ integrates two average-current-mode PWM controllers with voltage-feed-forward ramp modulation, enabling fast transient response to input voltage and load changes. Each channel features adaptive dead-time control, diode-emulation hysteretic mode at light loads, and independent soft-start via SOFT1/SOFT2 pins.
In DDR mode (DDR pin high), CH2 transforms into a bidirectional VTT regulator tracking VDDQ/2, while PG2/REF becomes a buffered 0.99–1.01×VOC2 reference output capable of sourcing up to 16 mA. Channel synchronization shifts from 180° (dual supply) to 0° (DDR) or 90° (VIN grounded + DDR high) to minimize inter-channel interference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 300 kHz ±15% - fixed-frequency CCM operation ensures predictable EMI profile and simplifies filter design. |
| Output Voltage Range | 0.9V to 5.5V per channel - set by external resistive divider referencing internal 0.9V bandgap. |
| VTT Tracking Accuracy | VDDQ/2 ±1% - enables compliant DDR memory termination without external op-amp circuitry. |
| Current Sensing Method | rDS(ON) of low-side MOSFET - eliminates need for dedicated sense resistor; optional external resistor supports precision OCP. |
| Overvoltage Protection | 115% of set point - holds lower MOSFET on and upper off until decay below threshold, preventing damage during fault conditions. |
| Operating Temperature | –10°C to +85°C ambient - validated for mobile PC and PDA thermal environments with junction limit of 125°C. |
| Input Voltage Range | 5V to 24V (battery) or 3.3V/5V system rail - dual-input capability supports both direct-battery and intermediate-rail architectures. |
Pinout & Package
ISL6225CAZ is housed in a Pb-free 28-lead SSOP package (M28.15), RoHS-compliant with matte tin terminations and MSL3 reflow rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1) | Signal ground reference | Common return for analog and digital blocks; 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 RLGPDN (1.8–3 Ω) to minimize turn-off delay. |
| PGND1/PGND2 (3,26) | Power ground returns | Separate high-current paths for lower MOSFET sources; critical for accurate current sensing and noise isolation. |
| 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 outputs; support 33V max UGATE-PHASE differential for wide VIN range. |
| BOOT1/BOOT2 (6,23) | Bootstrap capacitor supply | Connects to bootstrap diode cathode; referenced to PHASE to enable high-side drive above VIN. |
| ISEN1/ISEN2 (7,22) | Current sense inputs | Monitor rDS(ON) voltage drop across low-side FETs; configurable for precision sensing with external resistor. |
| EN1/EN2 (8,21) | Channel enable inputs | Active-high logic; tied together in typical use; <0.8V disables, >2.5V enables - supports sequencing control. |
| VOUT1/VOUT2 (9,20) | Output voltage feedback assist | When connected to output, enables smooth CCM↔hysteretic transition; grounded forces FCCM mode. |
| VSEN1/VSEN2 (10,19) | Voltage feedback inputs | Accept resistive divider midpoint; bias current 50–120 nA - enables high-impedance, low-error voltage setting. |
| OCSET1/OCSET2 (11,18) | Overcurrent threshold programming | Resistor-to-ground sets OCP level; OCSET2 repurposed as VDDQ/2 tracking reference in DDR mode. |
| SOFT1/SOFT2 (12,17) | Soft-start timing inputs | 5 µA internal current charges external capacitor; 1.5V threshold enables PGOOD and fault monitoring. |
| DDR (13) | DDR mode select input | High (>2.5V) configures IC for DDR memory power: enables VTT sink/source, VREF output, and 0° phase shift. |
| VIN (14) | Feed-forward input | Sets ramp amplitude proportional to input voltage; grounded in dual-step mode to double ramp slew rate. |
| VCC (28) | Bias supply input | +5V ±5% required; UVLO thresholds 4.3–4.75V rising, 4.1–4.45V falling - ensures stable startup under battery sag. |
| PG1 (15) | CH1 power-good output | Open-drain; pulled low when VOUT1 deviates >±10% from set point - used for system power sequencing. |
| PG2/REF (16) | Dual-function pin | In non-DDR mode: PGOOD2 open-drain output; in DDR mode: VDDQ/2 buffered reference (0.99–1.01×VOC2). |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode PWM control | Automatic switch between constant-frequency CCM (heavy load) and hysteretic diode-emulation (light load) - extends battery life without sacrificing regulation. |
| Integrated DDR power solution | VTT tracking (VDDQ/2) with bidirectional current capability + buffered VREF output - eliminates discrete op-amp and reference IC in DDR memory supplies. |
| No external current-sense resistor required | rDS(ON) of low-side MOSFET used for OCP and current-mode control - reduces BOM count and board space in cost-sensitive mobile designs. |
| Phase-shifted PWM operation | Selectable 0° (DDR), 90° (VIN=GND+DDR), or 180° (dual supply) channel phasing - minimizes input capacitor RMS current and EMI. |
| Internal feedback compensation | Type-2 compensated error amplifiers with VIN feed-forward - removes need for external compensation components and simplifies loop stability analysis. |
Applications
| DDR Memory Power Supply | Graphic Chipset Core Voltage |
|---|---|
Use Scenario: Powering DDR SDRAM modules in notebook PCs requiring precise VDDQ and actively sourced/sunk VTT. IC Role / Device Role / Timing Role: Dual-channel controller providing regulated VDDQ (CH1) and bidirectional VTT (CH2) with VDDQ/2 tracking and buffered reference. Use Value: Eliminates discrete op-amp and reference ICs while meeting JEDEC DDR timing and voltage tolerance specs (±1% VTT tracking). |
Use Scenario: Delivering tightly regulated core voltage (e.g., 1.2V) to GPU or integrated graphics processors in sub-notebooks. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller with fast transient response via voltage feed-forward and average current mode control. Use Value: Maintains <±2% load regulation across 0–5A while supporting dynamic GPU frequency scaling without output droop. |
| Mobile PC Dual-Rail System | Handheld Instrument Power Management |
Use Scenario: Generating independent 1.8V and 3.3V rails from a single 12V battery in desknote or convertible PCs. IC Role / Device Role / Timing Role: Dual-output PWM controller with independent soft-start, PGOOD, and overvoltage protection per channel. Use Value: Enables safe, sequenced power-up of CPU and peripheral subsystems with no external sequencing IC required. |
Use Scenario: Powering mixed-signal circuits (ADCs, sensors, microcontrollers) in portable test equipment with strict noise and efficiency requirements. IC Role / Device Role / Timing Role: Low-noise, high-efficiency buck controller operating in hysteretic mode during standby to extend battery runtime. Use Value: Achieves >85% efficiency at 10mA load via diode-emulation, reducing quiescent current versus fixed-frequency alternatives. |
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. | Designed for newer DDR2/DDR3 platforms; supports higher switching frequencies and tighter VTT accuracy. | Preferred for new designs requiring extended lifecycle support and updated JEDEC compliance. |
| RT8205A | Single-chip dual-phase controller with integrated MOSFET drivers; lacks DDR-specific VREF and VTT sink/source capability. | Targeted at general-purpose dual-output laptop VRMs, not DDR memory subsystems. | Consider only when DDR-specific functions are unnecessary and integrated drivers reduce board area. |
Compared with ISL6225CAZ, ISL6227 offers superior thermal metrics and DDR2/3 readiness but requires layout revision; RT8205A reduces component count in non-DDR applications but cannot replace ISL6225CAZ's VTT tracking or buffered reference functionality.
Availability
ISL6225CAZ is available at Aetrix Electronics and suitable for mobile PC power management, DDR memory subsystems, and handheld instrument power rails requiring stable component supply and long-term industrial availability.
Supply support for ISL6225CAZ 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 ISL6225CAZ belongs to Intersil's mobile power management product line, engineered specifically for efficient, compact, and compliant DDR memory and multi-rail power delivery in space-constrained portable systems.
FAQ
What is the function of the DDR pin on the ISL6225CAZ?
The DDR pin on the ISL6225CAZ is a mode-select input that, when driven high (>2.5V), reconfigures the IC into a complete DDR memory power solution. In this mode, CH2 becomes a bidirectional VTT regulator tracking VDDQ/2, PG2/REF outputs a buffered VDDQ/2 reference, and channel synchronization shifts to 0° phase. The ISL6225CAZ uses this pin to eliminate external op-amps and references in DDR memory power designs.
Does the ISL6225CAZ require an external current-sense resistor?
No, the ISL6225CAZ does not require an external current-sense resistor. It uses the rDS(ON) of the low-side MOSFET for current-mode control and overcurrent protection. An external resistor on OCSET1 or OCSET2 is optional and only needed when higher OCP precision is required than achievable with MOSFET rDS(ON) variation.
How does the ISL6225CAZ handle light-load efficiency?
The ISL6225CAZ improves light-load efficiency by automatically switching 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 circulating currents. The ISL6225CAZ implements hysteresis with a 15mV comparator window and eight-clock-cycle filtering to prevent mode chatter.
What are the valid input voltage ranges for the ISL6225CAZ?
The ISL6225CAZ supports two input configurations: direct battery input (5V to 24V) or regulated system rail (3.3V or 5V). Its VCC pin requires +5V ±5%, and the VIN pin accepts 5V–24V for feed-forward ramp generation. When VIN is grounded, the ramp generator switches to VCC, doubling slew rate - a feature used in dual-step conversion topologies where the ISL6225CAZ receives a clean 5V intermediate rail.
Can the ISL6225CAZ operate with only one channel enabled?
Yes, the ISL6225CAZ supports independent channel control via EN1 and EN2 pins. Either channel can be disabled by pulling its EN pin low while the other remains high. Both channels share VCC and GND, but have separate soft-start, feedback, and protection circuits. This allows flexible power sequencing and partial-system operation - for example, powering only the DDR VDDQ rail while holding VTT in standby.
ISL6225CAZ 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
ISL6225CAZ FAQ
1.How can I place an order for ISL6225CAZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6225CAZ 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 ISL6225CAZ reliable?
The price and inventory of ISL6225CAZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6225CAZ is usually 5 days.
3.What payment methods are accepted for ISL6225CAZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6225CAZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6225CAZ?
ISL6225CAZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6225CAZ 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 ISL6225CAZ?
For technical support, including ISL6225CAZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6225CAZ requirements.
6.How does Aetrix verify that ISL6225CAZ is sourced from the original manufacturer or authorized distributors?
All ISL6225CAZ 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 ISL6225CAZ meets industry standards.
7.What is the process for return or replacement of ISL6225CAZ?
All ISL6225CAZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6225CAZ, 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 ISL6225CAZ part is unused and in its original packaging.
Return procedure for ISL6225CAZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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