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Renesas ISL6237IRZ-T
- Part No.:
- ISL6237IRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL6237IRZ-T.pdf
- Description:
- IC REG CTRLR NOTEBK 4OUT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,460
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Product details
Overview
ISL6237IRZ-T from Intersil is a high-efficiency, quad-output 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: 0.5–2.5V adjustable or fixed 1.05V/3.3V), a 100mA/200mA switchover-capable linear regulator (LDO), and dual power-good outputs. It operates from 5.5V to 25V input and delivers up to 97% efficiency in battery-powered systems.
For engineers reviewing the ISL6237IRZ-T datasheet, ISL6237IRZ-T pinout, ISL6237IRZ-T application, or ISL6237IRZ-T equivalent, this device supports precise voltage sequencing, ultrasonic skip mode (>25kHz) for audio-noise suppression, rDS(ON) current sensing, and independent enable/soft-start for DDR1/DDR2/DDR3 core and I/O rail generation in space-constrained mobile platforms.
Technical Context
The ISL6237IRZ-T implements a constant-on-time (COT) control architecture with 100ns load-step response and selectable switching frequencies (200/300/400/500 kHz) via the TON pin. Its dual PWM channels operate independently with dedicated current-limit programming (ILIM1/ILIM2), feedback inputs (FB1/REFIN2), and power-good comparators (POK1/POK2).
It integrates an internal 2.0V reference (REF), BOOT voltage monitoring with automatic refresh, and a programmable LDO with switchover logic that connects LDO output to BYP via low-RON switches (0.7Ω for 5V, 1.5Ω for 3.3V) when enabled-enabling seamless transition between regulated and bypassed operation without external circuitry.
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-range adapter operation. |
| SMPS1 Output Range | 0.7V to 5.5V ±1.5% - configurable for CPU core (1.05V/1.5V) or system I/O (3.3V/5.0V) rails. |
| SMPS2 Output Range | 0.5V to 2.5V ±1.0% - optimized for DDR memory termination and low-voltage logic supplies. |
| LDO Output | Fixed 3.3V/5.0V or adjustable 0.7V–4.5V ±1.5%; 100mA continuous / 200mA switchover - powers auxiliary circuits with bootstrapped BYP support. |
| Switching Frequency | Selectable: 200/300/400/500 kHz - enables RF-sensitive design (fixed-PWM) or light-load efficiency (skip/ultrasonic modes). |
| Load-Step Response | 100ns - maintains tight regulation during rapid CPU/GPU load transients without external compensation. |
| Quiescent Power | 5mW - minimizes standby drain in always-on subsystems like real-time clocks or wake-on-LAN. |
Pinout & Package
ISL6237IRZ-T is housed in a 32-lead, 5mm × 5mm QFN package with exposed thermal pad (PKG DWG # L32.5x5B), rated for -40°C to +100°C operation and RoHS-compliant (Pb-free, matte tin e3 finish).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1, OUT2 | SMPS output sense inputs | Direct connection to SMPS1/SMPS2 inductor outputs; used for COT on-time calculation and feedback in fixed-mode. |
| FB1, REFIN2 | SMPS1/SMPS2 voltage programming inputs | FB1 sets SMPS1 output (GND = 5V, VCC = 1.5V, resistor divider = 0.7–5.5V); REFIN2 sets SMPS2 output (VCC = 3.3V, 3.3V supply = 1.05V, 0.5–2.5V = adjustable). |
| UGATE1/UGATE2, LGATE1/LGATE2 | High-side/low-side MOSFET gate drivers | UGATE drives external high-side N-MOSFETs (2A sink/source); LGATE drives synchronous rectifiers (1.7A source / 3.3A sink) with <35ns dead time. |
| POK1, POK2 | Open-drain power-good outputs | Assert low during soft-start, undervoltage (<–9%), or overvoltage (+11%) faults; enable sequencing of downstream rails. |
| EN1, EN2, EN_LDO | Independent enable inputs | Logic-level enables (2.4V high threshold) allow staggered startup and fault clearing by pulling below 0.8V. |
Key Features
| Feature | Design Value |
|---|---|
| Constant ON-Time Control | Eliminates need for current-sense resistors; achieves 100ns transient response while maintaining stable frequency via rDS(ON) sensing. |
| Ultrasonic Skip Mode | Maintains switching >25kHz to prevent audible noise in speakers/headphones - critical for notebook audio subsystems. |
| Programmable Current Limit | Adjustable per-channel threshold (40–215mV) with foldback protection prevents MOSFET failure during short-circuit events. |
| Dual Independent Soft-Start | 1.7ms digital ramp with pre-biased output support avoids inrush current damage to capacitors and downstream ICs. |
| Integrated LDO Switchover | Automatically connects LDO output to BYP pin via low-RON switch (0.7Ω/1.5Ω) when BYP voltage meets regulation thresholds - eliminates need for external OR-ing diodes. |
Applications
| Notebook Core & I/O Power | DDR Memory Supply |
|---|---|
Use Scenario: Generating CPU core (1.05V/1.5V) and system I/O (3.3V/5.0V) rails in ultra-thin notebooks with 3–4 cell Li+ batteries. IC Role / Device Role / Timing Role: Dual PWM controller providing tightly regulated, sequenced, and monitored DC outputs with integrated LDO for auxiliary bias. Use Value: Reduces BOM count by eliminating discrete current-sense resistors, external soft-start timers, and OR-ing diodes - enabling <8mm² solution size. | Use Scenario: Powering DDR1/DDR2/DDR3 memory modules requiring precise 1.8V, 2.5V, or 3.3V termination voltages with fast transient response. IC Role / Device Role / Timing Role: SMPS2 channel configured for 0.5–2.5V output with ±1.0% accuracy and 100ns load-step recovery ensures stable memory interface timing under burst access. Use Value: Maintains signal integrity during high-speed data transfers by suppressing output ripple to <15mV (typ.) and preventing voltage droop during 5A load steps. |
| Graphics Card Auxiliary Rail | Game Console System Power |
Use Scenario: Delivering clean, low-noise 3.3V/5.0V bias to GPU voltage regulators and display interface ICs in compact embedded graphics solutions. IC Role / Device Role / Timing Role: LDO output (3.3V/5.0V) with 200mA switchover capability and ultrasonic skip mode suppresses switching noise coupling into analog video paths. Use Value: Enables EMI-compliant design without ferrite beads or LC filters - meeting FCC Class B limits at board level. | Use Scenario: Consolidating multiple power rails (CPU core, GPU, memory, USB PHY) in portable game consoles powered by multi-cell Li+ packs. IC Role / Device Role / Timing Role: Quad-output controller managing independent enable sequencing, power-good handshaking, and thermal shutdown coordination across subsystems. Use Value: Supports reliable cold-boot and graceful shutdown sequences - preventing data corruption during battery depletion or thermal events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output notebook power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT8205AZQW | Single-chip dual-phase controller with integrated MOSFETs; lower input voltage range (4.5–24V); no LDO switchover function. | Suitable for cost-sensitive designs where board space is less constrained and discrete FET selection is not required. | Choose RT8205AZQW when integrated power stages reduce layout complexity and thermal management is handled externally. |
| TPS51220ARUKR | TI dual-output controller with integrated 5V LDO; supports only 0.7–3.5V SMPS2 range; lacks ultrasonic skip mode and independent POK outputs. | Better suited for legacy DDR2 systems with fixed 1.8V/2.5V requirements and simpler sequencing needs. | Choose TPS51220ARUKR when compatibility with TI's Fusion Digital Power GUI and existing TI-based reference designs is prioritized. |
Compared with RT8205AZQW and TPS51220ARUKR, the ISL6237IRZ-T uniquely combines independent dual PWM control, ultrasonic skip mode for audio-noise immunity, and LDO switchover logic - making it optimal for next-generation thin-and-light notebooks demanding minimal component count and stringent EMI performance.
Availability
ISL6237IRZ-T 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-T 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 Corporation, now part of Renesas Electronics, is a U.S.-based semiconductor company specializing in precision analog and power management ICs for computing, communications, and industrial markets.
The ISL6237 product line was designed specifically for high-density, multi-rail power delivery in battery-powered mobile computing platforms - emphasizing efficiency at light loads, fast transient response, and integration to minimize external components.
FAQ
What is the maximum output current capability of the ISL6237IRZ-T's integrated LDO?
The ISL6237IRZ-T's integrated LDO delivers up to 100mA continuously when regulating internally. During switchover mode - when BYP voltage meets the 5V or 3.3V threshold and LDOREFIN is tied to GND or VCC - the LDO output connects directly to BYP via a low-RON switch, enabling up to 200mA total current delivery. This dual-mode operation eliminates the need for external OR-ing diodes in notebook auxiliary rail designs.
How does the ISL6237IRZ-T achieve 100ns load-step response without external compensation?
The ISL6237IRZ-T achieves 100ns load-step response using its constant-on-time (COT) control architecture with rDS(ON) current sensing. By measuring the MOSFET's intrinsic on-resistance instead of relying on lossy external sense resistors, the controller eliminates parasitic delays and phase-shift errors. Combined with a fast comparator and direct on-time pulse generation, this enables immediate duty-cycle adjustment within 100ns of a load step - critical for modern CPU/GPU dynamic voltage scaling.
Can the ISL6237IRZ-T support DDR3 memory termination voltage (VTT) generation?
Yes, the ISL6237IRZ-T can generate DDR3 VTT (1.5V) using its SMPS2 channel. When REFIN2 is set to 0.75V (via resistor divider), SMPS2 outputs 1.5V ±1.0% across temperature and line/load variations. The channel supports 0–5A output current with 100ns transient response and integrated soft-stop discharge - meeting JEDEC JESD79-3F requirements for VTT rail stability during memory read/write bursts.
What are the valid logic levels for the EN1, EN2, and EN_LDO pins on the ISL6237IRZ-T?
The ISL6237IRZ-T defines three logic states per enable pin: logic low (<0.8V) disables the associated function and clears fault latches; logic mid-band (1.7–2.3V) enables delay-start sequencing (e.g., EN1 tied to REF starts SMPS1 after SMPS2 regulation); logic high (>2.4V) fully enables the function. All enable inputs are CMOS-compatible and tolerate up to VCC + 0.3V, supporting direct interfacing with 3.3V or 5V GPIOs without level-shifting.
Does the ISL6237IRZ-T require external bootstrap capacitors for both high-side drivers?
Yes, the ISL6237IRZ-T requires two external ceramic bootstrap capacitors: one connected between BOOT1 and PHASE1 for SMPS1, and another between BOOT2 and PHASE2 for SMPS2. These capacitors must be ≥0.1µF X7R/X5R MLCCs placed adjacent to the respective BOOT pins. The internal bootstrap diode (VF = 0.65–0.8V) charges each capacitor during the low-side conduction phase - ensuring sufficient gate drive voltage for the high-side N-MOSFETs across the full 0–100% duty cycle range.
ISL6237IRZ-T 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)
ISL6237IRZ-T FAQ
1.How can I place an order for ISL6237IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6237IRZ-T 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-T reliable?
The price and inventory of ISL6237IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6237IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6237IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6237IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6237IRZ-T?
ISL6237IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6237IRZ-T 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-T?
For technical support, including ISL6237IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6237IRZ-T requirements.
6.How does Aetrix verify that ISL6237IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6237IRZ-T 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-T meets industry standards.
7.What is the process for return or replacement of ISL6237IRZ-T?
All ISL6237IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6237IRZ-T, 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-T part is unused and in its original packaging.
Return procedure for ISL6237IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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