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Renesas ISL6236IRZAR5281
- Part No.:
- ISL6236IRZAR5281
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL6236IRZAR5281.pdf
- Description:
- IC REG CTRLR NOTEBK 4OUT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,632
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Product details
Overview
ISL6236IRZAR5281 from Intersil is a quad-output, high-efficiency main power supply controller for notebook computers, integrating two constant-on-time PWM step-down controllers (SMPS1: 0.7–5.5V adjustable or fixed 1.5V/5.0V; SMPS2: 0.5–2.5V adjustable or fixed 1.05V/3.3V), a 100mA/200mA switchover LDO, dual POK outputs, and 3.3V/2.0V reference sources. It operates across 5.5–25V input, delivers up to 97% efficiency, and supports ultrasonic skip mode (>25kHz) to eliminate audio noise.
For engineers reviewing the ISL6236IRZAR5281 datasheet, ISL6236IRZAR5281 pinout, ISL6236IRZAR5281 application, or ISL6236IRZAR5281 equivalent, key selection considerations include dual independent enable/control, programmable current limit with foldback, rDS(ON) current sensing, selectable PWM/skip/ultrasonic modes, and integrated soft-start/soft-stop with pre-biased output support.
Technical Context
The ISL6236IRZAR5281 implements a constant-on-time control architecture enabling 100ns load-step response without external sense resistors, maintaining stable switching frequency under varying line/load conditions. Its dual PWM channels operate at independently selectable frequencies (200/300/400/500 kHz) via TON pin configuration and support three operating modes-fixed-frequency PWM, pulse-skipping, and ultrasonic skip-each optimized for RF immunity, light-load efficiency, or acoustic noise suppression.
It integrates a bootstrap-enabled linear regulator (LDO) with 3.3V/5V fixed or 0.7–4.5V adjustable output, automatic switchover to BYP (5V or 3.3V source), and internal soft-stop discharge to prevent negative voltages during shutdown. Fault protection includes overvoltage, undervoltage, thermal shutdown, and out-of-bound detection with dedicated POK1/POK2 open-drain outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 25V - supports 3-cell/4-cell Li+ battery inputs and wide-range adapter operation. |
| SMPS1 Output Range | 0.7V to 5.5V ±1.5% - configurable for DDR1/DDR2/DDR3 core or I/O rails with precision feedback. |
| SMPS2 Output Range | 0.5V to 2.5V ±1.0% - optimized for low-voltage logic, GPU, or memory interface supplies. |
| LDO Output | 3.3V/5.0V fixed or 0.7–4.5V adjustable, 100mA continuous / 200mA switchover - powers auxiliary circuits with bootstrapping to BYP. |
| Switching Frequency | Selectable: 200/300/400/500 kHz per channel - enables EMI tuning and layout optimization. |
| Load-Step Response | 100ns - ensures stable voltage regulation during CPU/GPU burst loads in mobile platforms. |
| Quiescent Power | 5mW - minimizes standby power draw in always-on system states. |
Pinout & Package
ISL6236IRZAR5281 is housed in a 32-lead, 5mm × 5mm QFN package with exposed thermal pad (Pb-free, RoHS compliant). Pin mapping is validated per FN6373 Rev 6.00 datasheet, Page 2 (top view) and Page 7 (pin descriptions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF (Pin 1) | 2.0V reference output | Provides ±1.0% stable 2V bias for external circuitry; max 50µA load capability. |
| TON (Pin 2) | Frequency select input | Configures SMPS1/SMPS2 switching frequencies: GND=400/500kHz, REF=open=400/300kHz, VCC=200/300kHz. |
| EN1 / EN2 (Pins 14, 27) | Independent enable inputs | Enable/disable SMPS1/SMPS2 separately; support delay-start sequencing when tied to REF. |
| POK1 / POK2 (Pins 13, 28) | Power-good open-drain outputs | Assert low if output deviates >9% from nominal or during soft-start; used for system power sequencing. |
| SECFB (Pin 20) | Secondary feedback input | Monitors external charge pump voltage; triggers LGATE1 refresh pulse if below 1.92–2.08V threshold. |
| LDOREFIN (Pin 8) | LDO reference input | Sets LDO output: GND=5V, VCC=3.3V, or 0.35–2.25V for 0.7–4.5V adjustable output (VLDO = 2×VLDOREFIN). |
Key Features
| Feature | Design Value |
|---|---|
| Constant ON-time control | Enables 100ns transient response without current-sense resistors, reducing BOM count and PCB area. |
| Ultrasonic skip mode | Maintains switching frequency >25kHz to eliminate audible coil whine in notebook audio subsystems. |
| Programmable current limit | Adjustable threshold (40–215mV) with foldback protects MOSFETs and inductors during overload or short-circuit events. |
| Dual independent soft-start | 1.7ms digital ramp with pre-biased output support prevents inrush current damage to downstream capacitors. |
| Integrated soft-stop discharge | Activates internal discharge FETs on shutdown to prevent negative voltage undershoot on SMPS outputs. |
Applications
| DDR Memory Power Supply | Notebook Main Logic Rail |
|---|---|
Use Scenario: Providing tightly regulated 1.5V/1.05V core and 3.3V/5.0V I/O supplies for DDR1/DDR2/DDR3 SDRAM modules in portable computing. IC Role / Device Role / Timing Role: Dual SMPS controller delivering independent, sequenced, and monitored voltage rails with ±1.5% accuracy and <10µs fault propagation. Use Value: Enables compliance with DDR timing margins and JEDEC voltage tolerance specs while minimizing board space via integrated references and LDO. | Use Scenario: Generating primary logic supplies (CPU core, chipset, GPU) in sub-notebook and ultraportable systems powered by 3–4 cell Li+ batteries. IC Role / Device Role / Timing Role: Quad-output power manager coordinating SMPS1 (core), SMPS2 (I/O), LDO (aux), and VREF3/REF for system-level power integrity. Use Value: Achieves up to 97% peak efficiency and 5mW quiescent dissipation, extending battery runtime without compromising transient response. |
| Graphics Card Auxiliary Supply | Mobile Communication Baseband |
Use Scenario: Delivering clean, low-noise 3.3V and 1.05V rails to discrete GPU or integrated graphics engines in gaming notebooks. IC Role / Device Role / Timing Role: High-frequency SMPS2 (500kHz) with ultrasonic skip mode suppresses switching noise near analog video/audio paths. Use Value: Eliminates audible artifacts during GPU load transitions while maintaining ±1.0% output regulation across temperature. | Use Scenario: Powering baseband processors and RF transceivers in PDAs and mobile broadband devices requiring multiple low-voltage rails. IC Role / Device Role / Timing Role: Compact 5×5mm QFN solution providing independent enable, POK, and sequencing for multi-rail SoC power domains. Use Value: Reduces component count with integrated references (2.0V/3.3V), LDO, and charge-pump monitoring (SECFB), accelerating design-in. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-output notebook power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL62381IRZ | Single 5V/3.3V fixed-output SMPS + dual adjustable LDOs; no SMPS2, no SECFB, lower integration. | Lacks second SMPS channel and charge-pump monitoring; suitable only for simpler dual-rail designs. | Choose ISL62381IRZ only when system requires only one buck converter and two LDOs, not quad-output capability. |
| RT8205AZQW | Quad-output controller with 3.3V/5V/1.8V/1.5V fixed outputs; no adjustable SMPS2 range, no ultrasonic skip mode. | Fixed-output architecture limits flexibility for DDR3/LPDDR or custom core voltages; lacks >25kHz noise suppression. | Prefer RT8205AZQW for cost-sensitive designs with static rail requirements but no need for SMPS2 adjustability or audio-noise mitigation. |
Compared with ISL6236IRZAR5281, ISL62381IRZ offers reduced integration and no second SMPS, while RT8205AZQW provides fixed outputs without ultrasonic skip or REFIN2-based SMPS2 adjustment-making ISL6236IRZAR5281 uniquely suited for flexible, noise-sensitive, multi-standard memory power in premium notebooks.
Availability
ISL6236IRZAR5281 is available at Aetrix Electronics and suitable for notebook computers, DDR memory power supplies, and mobile communication devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6236IRZAR5281 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 precision analog, power management, and interface ICs for computing, communications, and industrial markets.
The ISL6236 product line was designed specifically for high-efficiency, multi-rail power management in battery-powered notebook and sub-notebook platforms, emphasizing transient response, acoustic noise control, and minimal external component count.
FAQ
What is the maximum output current capability of the ISL6236IRZAR5281's integrated LDO?
The ISL6236IRZAR5281's integrated LDO delivers up to 100mA continuously when regulating internally. During switchover-when BYP is within the 5V or 3.3V threshold-the LDO output connects directly to the BYP rail via an internal switch, enabling up to 200mA total output current. This dual-mode operation supports higher peak loads without requiring an external LDO.
How does the ISL6236IRZAR5281 achieve ultrasonic operation to eliminate audio noise?
The ISL6236IRZAR5281 achieves ultrasonic operation by entering "ultrasonic skip mode" when the SKIP pin is tied to REF or left floating. In this mode, the controller maintains switching frequency above 25kHz (typically 25–37kHz), placing it beyond human hearing range. This eliminates audible coil whine during light-load conditions while preserving high efficiency via pulse-skipping behavior.
Can the ISL6236IRZAR5281 support DDR3 memory voltage requirements?
Yes, the ISL6236IRZAR5281 supports DDR3 memory voltage requirements through its SMPS1 channel, which provides a 0.7–5.5V adjustable output with ±1.5% accuracy-covering DDR3 core (1.5V) and I/O (3.3V) rails-and its SMPS2 channel, adjustable from 0.5–2.5V for low-voltage termination or auxiliary supplies. Its 100ns load-step response meets DDR3 dynamic regulation demands.
What is the purpose of the SECFB pin on the ISL6236IRZAR5281?
The SECFB (Secondary Feedback) pin on the ISL6236IRZAR5281 monitors an external 14V charge pump output via a resistive divider. When SECFB voltage drops below 1.92–2.08V, the controller asserts LGATE1 for 300ns to refresh the charge pump without over-discharging the output. This enables reliable high-side gate drive for N-channel MOSFETs in high-efficiency notebook power stages.
Does the ISL6236IRZAR5281 provide independent power-good signaling for each SMPS output?
Yes, the ISL6236IRZAR5281 provides independent open-drain power-good outputs: POK1 monitors SMPS1 and asserts low if its output falls >9% below nominal or during soft-start; POK2 performs identical monitoring for SMPS2. Both outputs support system-level power sequencing and fault isolation without external comparators.
ISL6236IRZAR5281 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Controller, Notebook Power System
- Voltage - Input:
- 5.5V ~ 25V
- Number of Outputs:
- 4
- Voltage - Output:
- Multiple
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
ISL6236IRZAR5281 FAQ
1.How can I place an order for ISL6236IRZAR5281 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6236IRZAR5281 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 ISL6236IRZAR5281 reliable?
The price and inventory of ISL6236IRZAR5281 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6236IRZAR5281 is usually 5 days.
3.What payment methods are accepted for ISL6236IRZAR5281?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6236IRZAR5281 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6236IRZAR5281?
ISL6236IRZAR5281 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6236IRZAR5281 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 ISL6236IRZAR5281?
For technical support, including ISL6236IRZAR5281 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6236IRZAR5281 requirements.
6.How does Aetrix verify that ISL6236IRZAR5281 is sourced from the original manufacturer or authorized distributors?
All ISL6236IRZAR5281 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 ISL6236IRZAR5281 meets industry standards.
7.What is the process for return or replacement of ISL6236IRZAR5281?
All ISL6236IRZAR5281 units undergo pre-shipment inspection (PSI). If there is an issue with ISL6236IRZAR5281, 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 ISL6236IRZAR5281 part is unused and in its original packaging.
Return procedure for ISL6236IRZAR5281:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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