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Renesas ISL6236IRZA-TKR5281
- Part No.:
- ISL6236IRZA-TKR5281
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL6236IRZA-TKR5281.pdf
- Description:
- IC REG CTRLR NOTEBK 4OUT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,031
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Product details
Overview
ISL6236IRZA-TKR5281 from Intersil is a quad-output, dual-step-down main power supply controller for notebook computers, integrating two constant-on-time PWM controllers (SMPS1: 0.7–5.5V adjustable or fixed 1.5V/5.0V; SMPS2: 0V–2.5V adjustable or fixed 1.05V/3.3V), a 3.3V/5V linear regulator (100mA continuous, 200mA switchover), and dual power-good outputs. It supports ultrasonic skip mode (>25kHz) to eliminate audio noise and delivers up to 97% efficiency in battery-powered systems.
For engineers reviewing the ISL6236IRZA-TKR5281 datasheet, ISL6236IRZA-TKR5281 pinout, ISL6236IRZA-TKR5281 application, or ISL6236IRZA-TKR5281 equivalent, key selection considerations include its dual independent enable inputs (EN1/EN2), programmable current limit with foldback, rDS(ON) current sensing, selectable PWM/skip/ultrasonic modes, and integrated 3.3V/5V reference outputs (VREF3/REF) for DDR1/2/3 and GPU rail sequencing.
Technical Context
The ISL6236IRZA-TKR5281 employs a constant ON-time control architecture enabling 100ns load-transient response without external sense resistors. Its dual PWM channels operate at independently selectable frequencies (200/300/400/500 kHz) via the TON pin, while SKIP pin configures pulse-skipping (light-load efficiency), fixed-frequency PWM (EMI control), or ultrasonic mode (≥25kHz, audio-noise-free).
It integrates three regulated output domains: SMPS1 (0.7–5.5V), SMPS2 (0–2.5V), and LDO (0.7–4.5V or fixed 3.3V/5.0V), each with dedicated feedback (FB1, REFIN2, LDOREFIN), independent soft-start (1.7ms), soft-stop discharge, and power-good comparators (POK1/POK2). The device monitors external charge pumps via SECFB and supports automatic LDO bootstrapping to BYP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 25V - supports 3–4 cell Li+ battery input and wide adapter range without external pre-regulation. |
| SMPS1 Output Range | 0.7V to 5.5V ±1.5% - covers DDR3 core (1.5V), CPU I/O (1.8V), and legacy logic rails. |
| SMPS2 Output Range | 0V to 2.5V ±1.0% - enables precise 1.05V DDR termination and 3.3V auxiliary supplies. |
| LDO Output | Fixed 3.3V/5.0V or adjustable 0.7–4.5V ±1.5%, 100mA continuous / 200mA switchover - powers low-noise analog circuits and BIOS flash. |
| Switching Frequency | Selectable: 200/300/400/500 kHz per channel - balances EMI, efficiency, and component size across loads. |
| Load Transient Response | 100ns - maintains tight regulation during CPU/GPU burst current demands without external compensation. |
| Quiescent Power | 5mW - extends battery runtime in deep-sleep states of notebook platforms. |
Pinout & Package
ISL6236IRZA-TKR5281 is housed in a thermally enhanced 32-lead 5×5 mm QFN package (Pb-free, RoHS compliant) with exposed thermal pad (PGND/GND connected underneath). Package drawing: L32.5x5B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1, OUT2 | SMPS output voltage sense | Direct connection to respective inductor output nodes; enables constant-on-time control and feedback in fixed/adjustable modes. |
| FB1, REFIN2, LDOREFIN | Output voltage programming inputs | Set SMPS1 (0.7–5.5V), SMPS2 (0–2.5V), and LDO (0.7–4.5V) via resistor dividers or direct logic-level ties. |
| UGATE1/2, LGATE1/2 | Synchronous MOSFET gate drivers | High-side (floating) and low-side (ground-referenced) drivers with 2A/3.3A sink-source capability for efficient buck stage control. |
| POK1, POK2 | Open-drain power-good outputs | Assert high-impedance when respective SMPS outputs are within ±9% regulation and soft-start complete; used for system sequencing. |
| SKIP, TON, EN1/EN2 | Mode and enable controls | Configure ultrasonic/PWM/skip operation, frequency selection, and independent channel startup/shutdown timing. |
Key Features
| Feature | Design Value |
|---|---|
| Constant ON-time control | Eliminates need for current-sense resistors, reduces BOM count, and delivers 100ns transient response without loop compensation. |
| Ultrasonic skip mode | Maintains switching >25kHz to prevent audible coil whine in thin-notebook chassis during light-load conditions. |
| Programmable current limit with foldback | Adjusts overcurrent threshold from 40mV to 215mV via ILIM1/ILIM2 pins, protecting MOSFETs during short-circuit events. |
| Dual independent soft-start | 1.7ms digital ramp with pre-biased output support prevents inrush into partially charged downstream rails. |
| Integrated 3.3V/5V references | VREF3 (3.3V ±2%) and REF (2.0V ±1%) provide precision bias for external ADCs, comparators, or memory termination networks. |
Applications
| Notebook Power Sequencing | DDR Memory Supply |
|---|---|
Use Scenario: Coordinating power-up of CPU core, I/O, and chipset rails in sub-notebook platforms with 3–4 cell Li+ batteries. IC Role / Device Role / Timing Role: Dual PWM controller generating 1.5V (CPU core), 5.0V (chipset), 3.3V (I/O), and 1.05V (DDR VTT) with independent enable and POK signaling. Use Value: Eliminates discrete supervisors and reduces sequencing complexity while maintaining ±1.5% output accuracy across temperature. | Use Scenario: Delivering tightly regulated 1.5V/1.8V/2.5V core and 1.05V/0.75V termination voltages for DDR1/DDR2/DDR3 modules. IC Role / Device Role / Timing Role: SMPS2 provides 1.05V VTT with dynamic adjustment via REFIN2; LDO supplies clean 3.3V for memory controller logic. Use Value: Achieves <±1% load regulation and <10µs fault propagation for DDR compliance under fast load steps. |
| Graphics Card Auxiliary Rail | Mobile Communication Baseband |
Use Scenario: Generating 1.2V GPU core and 3.3V I/O rails in compact gaming console power stages. IC Role / Device Role / Timing Role: SMPS1 configured for 1.2V (via FB1 divider), SMPS2 for 3.3V (REFIN2 = VCC), with independent POK monitoring. Use Value: Enables independent enable/disable of GPU rails during thermal throttling without affecting baseband subsystem. | Use Scenario: Powering RF transceiver, baseband processor, and PMIC interface in 3G/4G mobile hotspots. IC Role / Device Role / Timing Role: LDO delivers low-noise 3.3V for RF front-end bias; SMPS1 supplies 1.8V for baseband core; SECFB monitors charge pump for PA bias. Use Value: Integrates critical power functions into single 5×5 mm QFN, reducing PCB area by >40% vs discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail notebook power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL62381IRZ | Single 3-output controller (2x SMPS + LDO); no SECFB; lower max VIN (20V); same 32-pin QFN footprint. | Lacks secondary feedback for external charge pump monitoring; not suitable for designs requiring 14V pump refresh via LGATE1. | Choose for cost-sensitive notebooks where charge pump support is unnecessary and input voltage stays ≤20V. |
| RT8205AZQW | Triple-output (2x SMPS + LDO); supports 4.5–24V VIN; includes I²C interface for dynamic voltage scaling; different pinout and package (40-pin QFN). | Enables firmware-controlled rail reconfiguration but requires layout redesign and driver software integration. | Choose when system-level DVFS or telemetry reporting is required, accepting higher design complexity and BOM cost. |
Compared with ISL6236IRZA-TKR5281, ISL62381IRZ offers reduced feature set and input range but identical footprint for drop-in replacement where SECFB and 25V tolerance are unused; RT8205AZQW adds digital control at the cost of non-interchangeable packaging and firmware dependency.
Availability
ISL6236IRZA-TKR5281 is available at Aetrix Electronics and suitable for notebook computers, DDR memory power supplies, and graphics card auxiliary rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6236IRZA-TKR5281 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 mixed-signal ICs for power management, precision analog, and interface applications.
The ISL6236 product line was designed specifically for multi-rail, high-efficiency main power conversion in portable computing platforms, emphasizing ultra-low quiescent power, fast transient response, and seamless integration with DDR memory and GPU subsystems.
FAQ
What is the maximum input voltage rating for the ISL6236IRZA-TKR5281?
The ISL6236IRZA-TKR5281 has an absolute maximum VIN rating of +27V, with recommended operating range from 5.5V to 25V. This allows compatibility with 4-cell Li+ battery packs (up to ~17V fully charged) and wide-input AC adapters. Exceeding 25V continuously may impact reliability and thermal performance, especially at high ambient temperatures.
How does the ISL6236IRZA-TKR5281 achieve 100ns load-step response without external compensation?
The ISL6236IRZA-TKR5281 achieves 100ns load-step response using a constant ON-time control architecture that eliminates the need for traditional voltage-mode or current-mode loop compensation. Its internal one-shot timer directly modulates high-side gate drive based on output voltage deviation, enabling immediate correction without phase-margin constraints or external RC networks.
Can the ISL6236IRZA-TKR5281 generate both 1.05V and 3.3V simultaneously for DDR VTT and I/O rails?
Yes, the ISL6236IRZA-TKR5281 can generate 1.05V and 3.3V simultaneously: SMPS2 is configured for 1.05V by connecting REFIN2 to VREF3, while SMPS1 is set to 3.3V by tying FB1 to VCC. Both outputs operate independently with dedicated POK signals, enabling strict DDR timing compliance and rail isolation.
What is the function of the SECFB pin on the ISL6236IRZA-TKR5281?
The SECFB pin on the ISL6236IRZA-TKR5281 monitors an external 14V charge pump via a resistive divider. When SECFB falls below 1.92V, LGATE1 pulses for 300ns to refresh the pump without discharging its output capacitor. This ensures stable high-side gate drive for SMPS1 in high-VIN buck configurations where bootstrap capacitors alone are insufficient.
Does the ISL6236IRZA-TKR5281 support power sequencing between its SMPS outputs?
Yes, the ISL6236IRZA-TKR5281 supports controlled sequencing: EN1 and EN2 accept logic-level inputs to delay startup, and POK1/POK2 provide open-drain status signals. For example, connecting EN2 to POK1 ensures SMPS2 powers up only after SMPS1 reaches regulation, satisfying strict CPU-core-before-I/O requirements in x86 platforms.
ISL6236IRZA-TKR5281 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
ISL6236IRZA-TKR5281 FAQ
1.How can I place an order for ISL6236IRZA-TKR5281 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6236IRZA-TKR5281 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 ISL6236IRZA-TKR5281 reliable?
The price and inventory of ISL6236IRZA-TKR5281 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6236IRZA-TKR5281 is usually 5 days.
3.What payment methods are accepted for ISL6236IRZA-TKR5281?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6236IRZA-TKR5281 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6236IRZA-TKR5281?
ISL6236IRZA-TKR5281 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6236IRZA-TKR5281 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 ISL6236IRZA-TKR5281?
For technical support, including ISL6236IRZA-TKR5281 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6236IRZA-TKR5281 requirements.
6.How does Aetrix verify that ISL6236IRZA-TKR5281 is sourced from the original manufacturer or authorized distributors?
All ISL6236IRZA-TKR5281 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 ISL6236IRZA-TKR5281 meets industry standards.
7.What is the process for return or replacement of ISL6236IRZA-TKR5281?
All ISL6236IRZA-TKR5281 units undergo pre-shipment inspection (PSI). If there is an issue with ISL6236IRZA-TKR5281, 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 ISL6236IRZA-TKR5281 part is unused and in its original packaging.
Return procedure for ISL6236IRZA-TKR5281:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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