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Renesas ISL65426HRZ
- Part No.:
- ISL65426HRZ
- Manufacturer:
- Renesas
- Package:
- 50-VFQFN Exposed Pad
- Datasheet:
-
ISL65426HRZ.pdf
- Description:
- IC REG BUCK ADJ 6A DL 50QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,650
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Product details
Overview
ISL65426HRZ from Renesas (formerly Intersil) is a monolithic dual synchronous buck regulator with integrated MOSFETs, delivering up to 6A total output current across two independently controlled channels. It operates from 3V–5.5V input, supports 1V–4V adjustable or VID-programmable outputs, and features 1MHz fixed-frequency current-mode control with ±1% reference accuracy. It powers FPGA core/I/O rails in compact embedded systems.
For engineers reviewing the ISL65426HRZ datasheet, ISL65426HRZ pinout, ISL65426HRZ application, or ISL65426HRZ equivalent, key selection criteria include its user-partitionable 6×1A power block architecture, 180° out-of-phase PWM synchronization for reduced input ripple, independent soft-start and power-good signaling per channel, and -10°C to +100°C industrial ambient rating.
Technical Context
The ISL65426HRZ implements current-mode control with internal slope compensation and integrated error amplifiers, enabling stable all-ceramic capacitor designs and excellent transient response. Its dual PWM controllers operate at a fixed 1MHz switching frequency with minimum controllable on-time of 125ns and peak LX pulse width of 950ns.
Power block configuration is validated before soft-start via internal logic decoding of ISET1/ISET2 states and real-time LX connectivity verification across six switch nodes (LX1–LX6). Each channel's output voltage is set either by 2-bit VID inputs (V1SET1/V1SET2, V2SET1/V2SET2) or external resistor divider referenced to a 0.6V internal基准.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 5.5V - supports single-supply operation from common intermediate bus voltages like 3.3V or 5V. |
| Output Current Capability | Up to 6A total (configurable as 3A/3A, 4A/2A, 5A/1A, or 2A/4A) - enables flexible load partitioning without external power stage redesign. |
| Switching Frequency | 1MHz (±20%) - enables use of small, low-profile inductors and ceramic output capacitors. |
| Reference Voltage | 0.6V ±1% - ensures tight output regulation tolerance across temperature and load. |
| Ambient Temperature Range | -10°C to +100°C - qualified for extended-temperature industrial applications where standard -40°C/+85°C parts are unnecessary. |
| Efficiency | Up to 95% at 5V input / 2.5V output - minimizes thermal stress and improves power density in space-constrained PCB layouts. |
| Protection Features | Overcurrent, undervoltage, and thermal shutdown - provides autonomous fault handling without external supervision circuitry. |
Pinout & Package
ISL65426HRZ is housed in a 50-lead 5mm × 10mm thin QFN package with exposed thermal pad (PGND), optimized for high-power density and thermal dissipation in point-of-load applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Bias supply input | Provides regulated power to internal analog/digital circuitry; must be connected to highest available supply (≤5.5V) with local 1µF+ ceramic filtering. |
| PVIN1–PVIN6 | Power input for individual power blocks | Each supplies one 1A power block; grouped PVINx pins must share same input rail per channel (e.g., PVIN1/PVIN2/PVIN3 for Channel 1). |
| LX1–LX6 | Switch node outputs | Connect to external inductors; grouped LX pins per channel define effective current capability (e.g., LX1+LX2+LX3 = 3A Channel 1). |
| FB1, FB2 | Output voltage feedback inputs | Monitor regulated output voltage; support both VID-programmed and externally divided configurations down to 1V. |
| EN1, EN2 | Individual channel enable inputs | Threshold-sensitive (1.2V typ.) with 10µA internal pull-up; allow independent sequencing or simultaneous startup of each buck channel. |
| EN | System-level enable | 0.6V threshold with programmable hysteresis; used for multi-rail sequencing when bias supplies ramp at different rates. |
| ISET1, ISET2 | Power block configuration select | Set one of four valid current-sharing topologies (e.g., 4A/2A); controller validates physical LX connections before soft-start. |
| V1SET1/V1SET2, V2SET1/V2SET2 | Output voltage programming inputs | 2-bit VID interface selecting discrete outputs (1.2V, 1.5V, 1.8V, 2.5V, 3.3V) or enabling external resistor divider mode. |
| PG1, PG2 | Open-drain power-good indicators | Assert low when respective output falls outside ±15% regulation window; provide system-level status without external monitoring ICs. |
Key Features
| Feature | Design Value |
|---|---|
| User-partitionable 6×1A power blocks | Enables four configurable output current splits (e.g., 5A/1A) via pin-strapped ISET1/ISET2, eliminating need for multiple discrete regulators. |
| 180° out-of-phase PWM synchronization | Reduces RMS input current and input capacitor ripple by ~30% compared to in-phase operation, lowering EMI and bulk capacitance requirements. |
| Stable all-ceramic solution | Internal current-mode control with integrated compensation eliminates need for external type-II/type-III compensation networks, saving board area and BOM cost. |
| Dual independent digital soft-start | Prevents inrush current damage during power-up; each channel ramps output voltage over fixed 4ms interval with no external timing components. |
| Integrated thermal and overcurrent protection | Thermal shutdown at 150°C junction and cycle-by-cycle current limiting per power block eliminate requirement for external fault management circuitry. |
Applications
| FPGA Core & I/O Power | Low-Voltage Point-of-Load Regulation |
|---|---|
Use Scenario: Powering Xilinx Spartan-3 or Altera Cyclone II FPGA with separate 1.2V core and 3.3V I/O rails on a dense PCB. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator providing tightly regulated, sequenced, and monitored DC outputs directly adjacent to the FPGA. Use Value: Eliminates need for two discrete converters; 180° phase shift reduces input ripple, allowing smaller input capacitors and lower EMI filter complexity. | Use Scenario: Generating 1.5V/2A and 2.5V/2A for ASIC subsystems in telecom line cards operating at -10°C to +100°C ambient. IC Role / Device Role / Timing Role: Monolithic dual buck converter delivering precise, thermally robust power with built-in PG signaling for system health monitoring. Use Value: Extended temperature rating avoids derating or forced cooling; integrated protection prevents field failures due to overcurrent or thermal overload. |
| Multi-Rail Sequencing Systems | Distributed Power Architecture |
Use Scenario: Coordinating startup of 1.8V DSP core and 3.3V peripheral supply using independent EN1/EN2 and shared EN with external resistor dividers. IC Role / Device Role / Timing Role: Dual-output regulator with three enable inputs (EN, EN1, EN2) supporting complex power-up/down sequences in multi-input bias systems. Use Value: Eliminates external sequencing ICs; programmable hysteresis on EN allows custom POR thresholds matching upstream supply ramp profiles. | Use Scenario: Deploying identical ISL65426HRZ units across multiple PCBs in a modular server backplane to deliver localized 1.2V/4A and 3.3V/2A rails. IC Role / Device Role / Timing Role: Standardized, high-integration DC/DC solution enabling consistent power delivery, thermal management, and fault reporting across distributed subsystems. Use Value: Identical footprint and configuration simplifies inventory, layout reuse, and firmware calibration; QFN thermal pad ensures reliable heat transfer to chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL65426IRZA | Same silicon die, but rated for -40°C to +85°C ambient; identical pinout, electrical specs, and feature set. | Required for extended cold-temperature environments (e.g., outdoor base stations, automotive under-hood). | Select ISL65426IRZA only if full industrial temperature range (-40°C to +85°C) is mandatory; ISL65426HRZ offers cost and thermal margin advantages in warmer environments. |
| RTQ2132B-QA | 3A/3A dual buck with 2.7V–18V input, 2.5MHz switching, and AEC-Q100 Grade 2 qualification; no user-configurable power blocks. | Targeted at automotive infotainment and ADAS modules requiring higher input voltage and automotive qualification. | Choose RTQ2132B-QA only for automotive applications needing >5.5V input or AEC-Q100 compliance; ISL65426HRZ remains optimal for 3–5.5V industrial FPGA/ASIC power. |
Compared with ISL65426IRZA, the ISL65426HRZ trades wider cold-temperature capability for higher maximum ambient (+100°C vs +85°C), making it better suited for thermally constrained enclosures. Compared with RTQ2132B-QA, it offers finer current partitioning flexibility (six 1A blocks vs fixed 3A/3A) and lower input voltage compatibility, but lacks automotive qualification.
Availability
ISL65426HRZ is available at Aetrix Electronics and suitable for FPGA power delivery, point-of-load regulation, and multi-rail sequencing applications requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for ISL65426HRZ 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 acquired Intersil in 2017 and maintains its high-performance analog and power management portfolio, emphasizing reliability, integration, and thermal efficiency for industrial and computing applications.
The ISL65426HRZ belongs to Renesas' legacy Intersil power management product line, designed specifically to simplify high-current, multi-voltage power delivery for FPGAs, CPLDs, and ASICs in space- and thermal-constrained systems.
FAQ
What is the maximum ambient temperature rating for ISL65426HRZ?
The ISL65426HRZ is rated for an ambient temperature range of -10°C to +100°C, verified per datasheet FN6340 Rev 3.00. This extended upper limit supports operation in thermally demanding industrial enclosures without forced airflow, unlike the ISL65426IRZA variant rated to +85°C. The ISL65426HRZ maintains full electrical specifications across this range.
How does the ISL65426HRZ configure its 6A output split between the two channels?
The ISL65426HRZ uses ISET1 and ISET2 pins to select one of four valid current splits: 3A/3A, 4A/2A, 5A/1A, or 2A/4A. The controller verifies physical LX pin connectivity (e.g., LX1+LX2+LX3 tied together) against the programmed configuration before soft-start. This validation prevents miswiring-induced failure and ensures correct power block assignment for the ISL65426HRZ.
Can ISL65426HRZ generate output voltages below 1V or above 4V?
No - the ISL65426HRZ supports output voltages from 1V to 4V when using external resistor dividers (with VxSETx pins grounded), or discrete VID-set values (1.2V, 1.5V, 1.8V, 2.5V, 3.3V). Voltages below 1V are not supported due to the 0.6V internal reference and associated comparator limitations. Outputs above 4V exceed the 80% of input rule (e.g., 5V × 0.8 = 4V max) and are outside ISL65426HRZ specification.
Does ISL65426HRZ require external compensation components?
No - the ISL65426HRZ integrates full Type-II compensation within its current-mode control loop, enabling stable operation with only ceramic output capacitors and no external compensation network. This reduces design complexity, PCB area, and BOM count while maintaining excellent transient response, as confirmed in the FN6340 datasheet typical performance curves for ISL65426HRZ.
What protection features are built into ISL65426HRZ?
The ISL65426HRZ integrates overcurrent protection (per power block), undervoltage lockout (75% VREF trip), and thermal shutdown at 150°C junction temperature. It also includes power-good monitoring (PG1/PG2) with ±15% regulation window and hysteresis, plus power-on reset circuitry on VCC and PVINx pins. These features operate autonomously without external components, ensuring robust fault handling for the ISL65426HRZ in mission-critical systems.
ISL65426HRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 50-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 4V
- Current - Output:
- 6A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -10°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 50-QFN (5x10)
ISL65426HRZ FAQ
1.How can I place an order for ISL65426HRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL65426HRZ 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 ISL65426HRZ reliable?
The price and inventory of ISL65426HRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL65426HRZ is usually 5 days.
3.What payment methods are accepted for ISL65426HRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL65426HRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL65426HRZ?
ISL65426HRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL65426HRZ 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 ISL65426HRZ?
For technical support, including ISL65426HRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL65426HRZ requirements.
6.How does Aetrix verify that ISL65426HRZ is sourced from the original manufacturer or authorized distributors?
All ISL65426HRZ 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 ISL65426HRZ meets industry standards.
7.What is the process for return or replacement of ISL65426HRZ?
All ISL65426HRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL65426HRZ, 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 ISL65426HRZ part is unused and in its original packaging.
Return procedure for ISL65426HRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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