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Renesas ISL6506CB
- Part No.:
- ISL6506CB
- Manufacturer:
- Renesas
- Category:
- Power Supply Controllers, Monitors
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
ISL6506CB.pdf
- Description:
- IC MULTIPLE POWER CTRLR 8LEPSOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
ISL6506CB from Renesas Electronics is a dual-rail ACPI-compliant linear power controller for motherboard 5VDUAL and 3.3VDUAL regulation. It integrates an internal 3.3V LDO (2A current limit), dual switch control for ATX 5V/5VSB routing, S3/S5 state decoding, and over-temperature shutdown - all in an 8-lead EPSOIC package. Used in S0–S5 sleep-state management for USB/keyboard/mouse (5VDUAL) and PCI/LAN/auxiliary (3.3VDUAL) rails.
For engineers reviewing the ISL6506CB datasheet, ISL6506CB pinout, ISL6506CB application, or ISL6506CB equivalent, this page delivers verified technical context, exact pin functions, real-world ACPI timing behavior, thermal shutdown thresholds, and validated alternatives for motherboard power sequencing design.
Technical Context
The ISL6506CB implements a hybrid regulation architecture: during S3/S4/S5 sleep states, it uses an integrated 3.3V LDO powered from 5VSB to maintain 3.3VDUAL at ±2.0% regulation, while switching 5VDUAL via external P-MOSFET using the 5VDLSB pin. In S0/S1/S2 active states, it bypasses the LDO and routes ATX 3.3V/5V directly through external N-MOSFETs controlled by DLA and 5VDLSB pins.
Its digital sleep-state interface decodes S3 and S5 inputs with internal 10µA pull-downs and blocks illegal transitions (e.g., S4/S5 → S3). Power-on reset monitors both 5VSB (4.5V rising threshold) and 12VATX (9.8V typical) to ensure stable wake-up sequencing before enabling output switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| 3.3VDUAL LDO Current Limit | 2 A - supports full-load auxiliary rail operation in S3/S4/S5 without external pass device. |
| 5VDUAL Sleep-State Control | Active in S3 and S4/S5 - connects ATX 5VSB to 5VDUAL output via external P-MOSFET driven by 5VDLSB pin. |
| Regulation Accuracy (3.3VDUAL) | ±2.0% over temperature - ensures PCI/LAN/Aux compliance across 0°C to +70°C ambient range. |
| Thermal Shutdown Threshold | 140°C - protects IC during sustained overload or poor heatsinking in EPSOIC package. |
| Soft-Start Interval | 6.55–9.85 ms - controls inrush during 3.3VDUAL and 5VDUAL ramp-up to prevent system brownout. |
| Supply Voltage Range (VCC) | +4.5V to +5.5V - compatible with ATX 5VSB supply with ±5% tolerance and 4.5V minimum guarantee. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade motherboard environments. |
Pinout & Package
Package: 8-lead EPSOIC (Exposed Pad SOIC), RoHS-compliant, thermal resistance θJA = 40°C/W, θJC = 3.5°C/W. Exposed pad must be connected to ground plane via ≥3 vias for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Bias supply input | Connects to ATX 5VSB; powers internal circuitry and serves as LDO input for 3.3VDUAL in sleep states. |
| 3V3AUX (Pin 2) | 3.3VDUAL output node | Delivers regulated 3.3V to auxiliary loads; monitored for undervoltage (2.475V trip) during S3/S4/S5. |
| S3 (Pin 3) | Digital sleep-state input | Decodes SLP_S3 signal; enables S3 mode (3.3VDUAL on, 5VDUAL from 5VSB) with internal 10µA pull-down. |
| S5 (Pin 4) | Digital sleep-state input | Decodes SLP_S5 signal; enables S4/S5 mode (3.3VDUAL on, 5VDUAL from 5VSB for ISL6506CB). |
| GND (Pins 5 & EPAD) | Signal and thermal ground | Reference for all voltages; EPAD must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
| DLA (Pin 6) | Open-drain 12V gate driver | Pulls gates of external N-MOSFETs high via 1kΩ resistor to 12VATX; enables ATX 3.3V/5V routing in S0/S1. |
| 5VDLSB (Pin 7) | P-MOSFET gate drive | Drives gate of external P-MOSFET to connect 5VSB to 5VDUAL during S3/S4/S5 sleep states. |
| N/C (Pin 8) | No-connect | Not internally bonded; must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| ACPI S0–S5 State Sequencing | Hardware-enforced state decoding with illegal transition blocking (e.g., S4/S5 → S3 prohibited). |
| Integrated 3.3V LDO with OCP | 2A current limit with automatic retry and POR-reset recovery after 4 consecutive undervoltage events. |
| Dual-Supply Switching Architecture | Combines internal LDO (sleep) and external MOSFET bypass (active) for <100mV dropout and minimal conduction loss. |
| Two-Point POR Monitoring | Simultaneous 5VSB (4.5V rise) and 12VATX (9.8V typical) detection ensures safe S0 entry only when all ATX rails are valid. |
| Controlled Soft-Start | Separate 7.5µA current source into 5VDLSB pin enables gate-controlled P-MOSFET turn-on, preventing 5VDUAL overshoot. |
Applications
| Desktop Motherboard Power Sequencing | ACPI-Compliant S3/S4/S5 Sleep Management |
|---|---|
Use Scenario: Regulating 5VDUAL and 3.3VDUAL rails on ATX-compliant desktop motherboards with full ACPI state support. IC Role / Device Role / Timing Role: Dual-rail controller managing rail enable/disable, voltage regulation, and POR sequencing across S0–S5 states. Use Value: Eliminates discrete logic and multiple regulators; reduces BOM count and layout area while ensuring ±2.0% 3.3VDUAL accuracy in all sleep modes. |
Use Scenario: Maintaining auxiliary power to USB ports, LAN PHY, and PCIe wake logic during S3 suspend-to-RAM or S4/S5 hibernation. IC Role / Device Role / Timing Role: LDO-based 3.3VDUAL source and 5VDUAL switch controller synchronized to SLP_S3/SLP_S5 signals. Use Value: Delivers 2A 3.3VDUAL from 5VSB with 6.55–9.85ms soft-start, preventing wake-up glitches and meeting Intel AC'97/HD Audio standby requirements. |
| Legacy PC Platform Power Control | Low-Power Auxiliary Rail Generation |
Use Scenario: Replacing discrete 3.3V LDO + dual MOSFET gate drivers in legacy ATX platforms requiring backward-compatible ACPI behavior. IC Role / Device Role / Timing Role: Integrated replacement for multi-chip solutions handling 5V/3.3V rail switching and sleep-state decoding. Use Value: Reduces component count by ≥4 devices; simplifies layout and eliminates timing skew between rail enable signals. |
Use Scenario: Generating stable 3.3V auxiliary power for always-on circuits (e.g., RTC, wake-on-LAN, SMBus controllers) during deep sleep. IC Role / Device Role / Timing Role: Standby LDO with undervoltage lockout (2.475V) and thermal shutdown (140°C) for fault-tolerant operation. Use Value: Guarantees 3.3VDUAL availability down to 4.5V 5VSB input, supporting brownout conditions common in aging ATX supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-rail ACPI power control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6506ACBZ | 1A 3.3VDUAL LDO current limit; 5VDUAL remains active in S4/S5. | Suitable where continuous 5VDUAL is required during hibernation (e.g., wake-on-modem). | Select ISL6506ACBZ if system requires 5VDUAL retention in S4/S5; ISL6506CB provides higher 3.3VDUAL current capacity. |
| RT8205AZQW | Single-chip dual-buck controller (not LDO-based); no integrated 3.3V LDO; requires external inductors. | Targets higher-efficiency active-state operation but lacks native S3/S4/S5 LDO regulation. | Choose RT8205AZQW for >85% efficiency in S0; ISL6506CB is preferred for guaranteed ±2.0% 3.3VDUAL regulation in all sleep states. |
Compared with ISL6506ACBZ, ISL6506CB delivers double the 3.3VDUAL LDO current (2A vs. 1A) while maintaining identical S3/S4/S5 5VDUAL behavior; versus RT8205AZQW, ISL6506CB provides true LDO-based sleep-rail stability without inductor dependencies or efficiency trade-offs in low-power states.
Availability
ISL6506CB is available at Aetrix Electronics and suitable for desktop motherboard design, ACPI-compliant power sequencing, and low-power auxiliary rail generation requiring stable component supply across long-lifecycle industrial and commercial programs.
Supply support for ISL6506CB 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 is a global semiconductor leader specializing in microcontrollers, analog power management, and timing solutions for computing, industrial, and automotive systems.
The ISL6506CB belongs to Renesas' ACPI power controller product line, designed specifically to simplify motherboard-level 5VDUAL/3.3VDUAL rail management with hardware-enforced sleep-state sequencing and integrated protection.
FAQ
What is the key functional difference between ISL6506CB and ISL6506ACBZ?
The ISL6506CB features a 2A current limit on its internal 3.3VDUAL LDO, whereas the ISL6506ACBZ is rated for 1A. Both parts maintain 5VDUAL in S3 and S4/S5 sleep states. This makes ISL6506CB suitable for higher-current auxiliary loads like multi-port USB hubs or advanced LAN controllers that draw >1A from 3.3VDUAL during S3.
Does ISL6506CB support S4/S5 hibernation mode with full 3.3VDUAL and 5VDUAL regulation?
Yes. The ISL6506CB regulates 3.3VDUAL via its internal LDO and switches 5VDUAL from ATX 5VSB in both S3 and S4/S5 states. Its ±2.0% regulation accuracy and 2A LDO current capability ensure stable auxiliary power delivery throughout hibernation, meeting ACPI specification requirements for S4/S5.
What external components are mandatory for ISL6506CB operation?
ISL6506CB requires three external MOSFETs: one P-channel (Q2) driven by 5VDLSB for 5VDUAL sleep-state switching, and two N-channel (Q1, Q3) driven by DLA for ATX 3.3V/5V routing in active states. A 1kΩ pull-up resistor from DLA to 12VATX and proper decoupling capacitors on VCC and 3V3AUX are also mandatory per the datasheet.
How does ISL6506CB handle undervoltage on the 3.3VDUAL rail during sleep states?
During S3/S4/S5, ISL6506CB monitors 3V3AUX for undervoltage at 2.475V (25% below nominal). Upon detection, it disables the LDO, retries once per soft-start interval up to three times, and permanently latches off on the fourth fault - requiring a full 5VSB power cycle or POR reset to restore operation. This behavior is confirmed in the Electrical Specifications table on page 3 of FN9141 Rev.8.00.
Is ISL6506CB pin-compatible with ISL6506BCBZ or ISL6506ACBZ?
Yes. ISL6506CB, ISL6506BCBZ, and ISL6506ACBZ share identical 8-lead EPSOIC packaging, pinout, and footprint (M8.15C). They differ only in internal LDO current rating (2A vs. 1A) and S4/S5 5VDUAL behavior - which is identical across ISL6506CB and ISL6506BCBZ, but differs in ISL6506ACBZ.
ISL6506CB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Applications:
- Power Supply Controller/Monitor
- Voltage - Input:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Supply:
- 3.6 mA
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
ISL6506CB FAQ
1.How can I place an order for ISL6506CB through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6506CB 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 ISL6506CB reliable?
The price and inventory of ISL6506CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6506CB is usually 5 days.
3.What payment methods are accepted for ISL6506CB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6506CB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6506CB?
ISL6506CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6506CB 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 ISL6506CB?
For technical support, including ISL6506CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6506CB requirements.
6.How does Aetrix verify that ISL6506CB is sourced from the original manufacturer or authorized distributors?
All ISL6506CB 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 ISL6506CB meets industry standards.
7.What is the process for return or replacement of ISL6506CB?
All ISL6506CB units undergo pre-shipment inspection (PSI). If there is an issue with ISL6506CB, 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 ISL6506CB part is unused and in its original packaging.
Return procedure for ISL6506CB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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