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Renesas ISL6237IRZ
- Part No.:
- ISL6237IRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL6237IRZ.pdf
- Description:
- IC REG CTRLR NOTEBK 4OUT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,505
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Product details
Overview
ISL6237IRZ from Intersil is a high-efficiency, quad-output main power supply controller for notebook computers, integrating two constant-on-time PWM step-down controllers (SMPS1: 0.7–5.5V; SMPS2: 0.5–2.5V), a 3.3V/5V linear regulator (100mA continuous, 200mA switchover), and on-board sequencing, POK outputs, digital soft-start, and soft-stop discharge. It operates across 5.5–25V input and delivers up to 97% efficiency in PWM mode.
For engineers reviewing the ISL6237IRZ datasheet, ISL6237IRZ pinout, ISL6237IRZ application, or ISL6237IRZ equivalent, key selection considerations include its dual adjustable SMPS outputs with ±1.5% accuracy, ultrasonic skip mode (>25kHz), 100ns load-step response, rDS(ON) current sensing, and independent enable/POK logic - critical for DDR1/2/3 core and I/O rail power in space-constrained mobile platforms.
Technical Context
The ISL6237IRZ employs a constant-on-time (COT) control architecture that eliminates external sense resistors and enables ultrafast 100ns transient response while maintaining stable switching frequency via programmable TON pin configuration (200/400kHz for SMPS1; 300/500kHz for SMPS2). Its ultrasonic pulse-skipping mode ensures operation above 25kHz to avoid audible noise in audio-sensitive systems.
It integrates three independent regulation paths: SMPS1 (adjustable 0.7–5.5V), SMPS2 (adjustable 0.5–2.5V), and an LDO (fixed 3.3V/5V or adjustable 0.7–4.5V), each with dedicated enable, feedback, current-limit (ILIM1/ILIM2), and power-good (POK1/POK2) signals. Bootstrapping, thermal shutdown, and output discharge are fully internalized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 25V - supports 3-cell and 4-cell Li+ battery inputs and wide-input adapter operation. |
| SMPS1 Output Range | 0.7V to 5.5V ±1.5% - covers DDR3 core (1.5V), CPU I/O (1.05V), and legacy logic rails. |
| SMPS2 Output Range | 0.5V to 2.5V ±1.0% - optimized for GPU core, memory termination, and low-voltage peripherals. |
| LDO Output | 3.3V/5.0V fixed or 0.7–4.5V adjustable, 100mA continuous / 200mA switchover - powers USB PHY, SMBus, and auxiliary logic without external regulators. |
| Switching Frequency | Selectable: 200/400kHz (SMPS1), 300/500kHz (SMPS2) - balances EMI, efficiency, and component size. |
| Load-Step Response | 100ns - maintains tight voltage regulation during CPU/GPU burst loads without external compensation. |
| Quiescent Power | 5mW - minimizes standby power in always-on system states like sleep or suspend-to-RAM. |
Pinout & Package
ISL6237IRZ is housed in a thermally enhanced 32-lead 5×5mm QFN package with exposed thermal pad (Pb-free, RoHS compliant), rated for –40°C to +100°C operation. The package supports high-current MOSFET gate drive and efficient heat dissipation in compact notebook power stages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UGATE1, UGATE2 | High-side MOSFET gate drivers | 2A sink/source capability enables fast turn-on of external N-channel high-side FETs in synchronous buck stages. |
| LGATE1, LGATE2 | Synchronous rectifier gate drivers | 1.7A source / 3.3A sink drives low-side FETs; integrated dead time (15–50ns) prevents shoot-through. |
| PHASE1, PHASE2 | Inductor node / current-sense input | Direct connection to buck inductor; senses current via rDS(ON) of low-side FET - no external sense resistor required. |
| FB1, REFIN2 | SMPS1/SMPS2 feedback inputs | Enable precise output adjustment: FB1 sets SMPS1 (0.7–5.5V); REFIN2 sets SMPS2 (0.5–2.5V). |
| EN1, EN2, EN_LDO | Independent enable inputs | Allow flexible power-up sequencing - e.g., delay SMPS1 start until SMPS2 reaches regulation by tying EN1 to REF. |
| POK1, POK2 | Open-drain power-good outputs | Assert high-impedance when respective output is within ±9% of nominal; used for system reset or downstream enable logic. |
| BYP, LDOREFIN | LDO switchover control | Configure LDO as 5V (LDOREFIN = GND, BYP = 5V) or 3.3V (LDOREFIN = VCC, BYP = 3.3V); enables seamless bootstrapping. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-on-time PWM control | Eliminates need for external current-sense resistors and loop compensation components - reduces BOM count and layout complexity. |
| Ultrasonic skip mode | Maintains switching >25kHz under light load - prevents audible coil whine in notebook speakers and audio subsystems. |
| Digital soft-start (1.7ms) | Prevents inrush current and output overshoot during power-up; supports pre-biased output startup. |
| Internal soft-stop discharge | Actively pulls SMPS outputs to GND at shutdown - avoids negative voltages on powered-down logic inputs. |
| Programmable current limit with foldback | Adjustable threshold (40–215mV) and foldback behavior protect against short-circuit faults while minimizing thermal stress. |
Applications
| Notebook Core & I/O Power | DDR Memory Supply |
|---|---|
Use Scenario: Powering CPU core voltage (VDDQ) and chipset I/O rails in sub-notebook platforms with 3–4 cell Li+ batteries. IC Role / Device Role / Timing Role: Dual SMPS generate tightly regulated 1.05V/1.5V core and 3.3V/5.0V I/O supplies; LDO provides clean 3.3V for PCIe and SATA PHYs. Use Value: 97% peak efficiency and 5mW quiescent power extend battery runtime; ultrasonic skip mode eliminates acoustic noise during idle. |
Use Scenario: Delivering precision 1.8V, 1.5V, or 1.35V DDR2/DDR3 termination and VTT rails in dual-channel memory subsystems. IC Role / Device Role / Timing Role: SMPS2 configured for 0.75V–1.5V output with ±1.0% accuracy; independent POK2 validates rail stability before memory initialization. Use Value: 100ns load-step response prevents timing violations during burst-mode memory access; soft-stop discharge avoids bus contention on power-down. |
| Graphics Card Auxiliary Power | Game Console System Rail |
Use Scenario: Providing dynamic GPU core (0.8–1.2V) and memory interface (1.2–1.5V) supplies in discrete graphics modules. IC Role / Device Role / Timing Role: SMPS1 and SMPS2 independently enabled via EN1/EN2; TON pin selects lower 200/300kHz frequencies to reduce EMI near high-speed video interfaces. Use Value: rDS(ON) current sensing enables accurate current limiting without degrading efficiency; thermal shutdown protects during GPU thermal throttling. |
Use Scenario: Generating multiple low-noise rails (1.2V CPU, 1.8V GPU, 3.3V I/O) in handheld game consoles with aggressive thermal constraints. IC Role / Device Role / Timing Role: Integrated LDO supplies 3.3V to audio codec and SD card controller; BYP/LDOREFIN pins enable automatic switchover to battery or SMPS1 output. Use Value: 5×5mm QFN footprint saves PCB area; 100°C operating range supports fanless console designs; POK outputs coordinate multi-rail power sequencing. |
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 |
|---|---|---|---|
| RT8205AZSP | Single 5V/3.3V fixed-output controller with integrated MOSFETs; no adjustable SMPS outputs or LDO switchover. | Suitable only for basic dual-rail notebooks without DDR3 or GPU core requirements. | Choose RT8205AZSP only if fixed 5V/3.3V outputs suffice and board space allows integrated-FET solution. |
| TPS51220ARGER | Supports 0.5–5.5V adjustable outputs and 3.3V LDO, but lacks ultrasonic skip mode and has slower 500ns transient response. | Valid for DDR3 systems requiring ±1.5% accuracy, but may require external audio shielding due to sub-25kHz skip noise. | Select TPS51220ARGER when TI ecosystem compatibility or higher VIN tolerance (36V) is prioritized over acoustic performance. |
Compared with RT8205AZSP and TPS51220ARGER, the ISL6237IRZ uniquely combines dual adjustable SMPS, ultrasonic skip mode, 100ns transient response, and LDO switchover in a single 5×5mm QFN - making it optimal for high-density, acoustically sensitive notebook and portable computing designs where flexibility and efficiency are critical.
Availability
ISL6237IRZ is available at Aetrix Electronics and suitable for notebook computers, DDR memory power supplies, and portable gaming devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6237IRZ 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 applications.
The ISL6237IRZ belongs to Intersil's notebook power controller product line, designed specifically to consolidate multiple voltage rails, simplify power sequencing, and eliminate audible noise in mobile computing platforms.
FAQ
What is the maximum output current capability of the ISL6237IRZ's integrated LDO?
The ISL6237IRZ's LDO delivers up to 100mA continuously when regulating from VIN. During switchover - when BYP is within threshold and LDOREFIN is tied to GND or VCC - it can source up to 200mA by connecting the LDO pin directly to the BYP rail via internal 0.7Ω (5V) or 1.5Ω (3.3V) switches. This enables temporary high-current support for USB or display interface power without external regulators.
How does the ISL6237IRZ achieve 100ns load-step response without external compensation?
The ISL6237IRZ achieves 100ns load-step response through its constant-on-time (COT) control architecture, which directly ties switching on-time to output voltage deviation - eliminating the need for traditional voltage-mode or current-mode compensation networks. This architecture inherently provides fast transient recovery without phase-margin tuning, and the ISL6237IRZ implements it with internal high-bandwidth comparators and zero-latency gate drivers.
Can the ISL6237IRZ support DDR3 memory termination voltage (VTT) generation?
Yes, the ISL6237IRZ supports DDR3 VTT generation via SMPS2, which is configurable from 0.5V to 2.5V with ±1.0% accuracy. When set to 0.75V (half of 1.5V VDDQ) or 0.9V (half of 1.8V), and paired with independent POK2 monitoring, it meets JEDEC VTT tolerance and sequencing requirements. Its 100ns transient response also prevents VTT droop during high-speed data bursts.
What is the purpose of the TON pin on the ISL6237IRZ, and how does it affect operation?
The TON pin on the ISL6237IRZ selects the base switching frequency: grounded for 400kHz/500kHz (SMPS1/SMPS2), connected to REF or left floating for 400kHz/300kHz, and tied to VCC for 200kHz/300kHz. This allows designers to optimize between efficiency (lower frequency), EMI (higher frequency), and component size (higher frequency enables smaller inductors/capacitors) - all without changing external components.
Does the ISL6237IRZ include thermal protection, and what is its trip threshold?
Yes, the ISL6237IRZ includes internal thermal shutdown protection with a fixed trip threshold of +150°C. When junction temperature exceeds this limit, the device disables all SMPS controllers and the LDO, holding POK1/POK2 low and entering a safe state. Recovery occurs automatically once temperature falls below the hysteresis threshold (~140°C), ensuring robust operation in thermally constrained notebook chassis.
ISL6237IRZ 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)
ISL6237IRZ FAQ
1.How can I place an order for ISL6237IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6237IRZ 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 ISL6237IRZ reliable?
The price and inventory of ISL6237IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6237IRZ is usually 5 days.
3.What payment methods are accepted for ISL6237IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6237IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6237IRZ?
ISL6237IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6237IRZ 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 ISL6237IRZ?
For technical support, including ISL6237IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6237IRZ requirements.
6.How does Aetrix verify that ISL6237IRZ is sourced from the original manufacturer or authorized distributors?
All ISL6237IRZ 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 ISL6237IRZ meets industry standards.
7.What is the process for return or replacement of ISL6237IRZ?
All ISL6237IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6237IRZ, 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 ISL6237IRZ part is unused and in its original packaging.
Return procedure for ISL6237IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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