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Renesas ISL85410FRZ-T
- Part No.:
- ISL85410FRZ-T
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85410FRZ-T.pdf
- Description:
- IC REG BUCK ADJ 1A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,774
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Product details
Overview
ISL85410FRZ-T from Renesas Electronics is a wide-input 1A synchronous buck regulator integrating high-side and low-side NMOS FETs, operating from 3V to 40V input, delivering up to 1A continuous output current with 500kHz default switching frequency and PFM/PWM light-load mode selection. It serves as a primary DC-DC step-down power stage in industrial control and portable instrumentation.
For engineers reviewing the ISL85410FRZ-T datasheet, ISL85410FRZ-T pinout, ISL85410FRZ-T application, or ISL85410FRZ-T equivalent, key selection criteria include its integrated dual-FET architecture, internal/external compensation flexibility, -40°C to +125°C industrial temperature range, and programmable 300kHz–2MHz switching frequency via FS pin resistor.
Technical Context
The ISL85410FRZ-T implements peak current-mode PWM control with 450mV/T slope compensation and 500mV/A current sense trans-resistance for stable loop dynamics and fast transient response. Its error amplifier offers selectable transconductance (50µA/V internal or 230µA/V external) and supports both internal fixed-frequency operation and external synchronization up to 2MHz.
Protection features include overcurrent limiting (1.5A typical peak), negative current limit (-0.6A), thermal shutdown at 150°C with 20°C hysteresis, boot undervoltage lockout, and power-good monitoring with ±6% regulation window referenced to 0.599V FB threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports direct connection to 12V/24V industrial rails and 36V battery systems without pre-regulation. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in embedded systems. |
| Switching Frequency | Default 500kHz; adjustable 300kHz–2MHz via FS pin resistor - enables EMI optimization and inductor size trade-offs. |
| FB Reference Voltage | 0.599V ±0.007V - sets output voltage accuracy; used with external resistor divider for precise VOUT programming. |
| Efficiency at 1A | Up to 95% at VIN=12V, VOUT=3.3V, PFM mode - reduces thermal load in space-constrained designs. |
| Operating Temperature | -40°C to +125°C junction - qualified for harsh industrial and automotive under-hood environments. |
| Package | 12-lead 4mm × 3mm DFN with exposed thermal pad - provides low thermal resistance (θJC = 4.5°C/W) for passive cooling. |
Pinout & Package
The ISL85410FRZ-T is housed in a RoHS-compliant, Pb-free 12-lead DFN package (4mm × 3mm, L12.4x3 drawing) with an exposed thermal pad (EPAD) requiring ≥5 vias to GND plane for optimal thermal performance and signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SS | Soft-start timing control | Capacitor-to-GND sets ramp time; tie to VCC for fixed 2ms internal soft-start to prevent inrush current. |
| SYNC | Mode selection & sync input | Logic level selects PFM/PWM; connect to external clock > fSW for synchronized multi-rail systems. |
| BOOT | Bootstrap supply for high-side gate | Requires 100nF ceramic capacitor to PHASE to sustain high-side NMOS turn-on during duty cycle. |
| VIN | Main power input | Supplies power stage and internal LDO; requires ≥4.7µF ceramic decoupling close to pin. |
| PHASE | Switch node | Connects internal FETs to external inductor; critical for layout-minimize loop area to reduce EMI. |
| PGND | Power ground return | Must be connected directly to system GND plane-separate from signal GND to avoid noise coupling. |
| EN | Enable control | Rising threshold 1.2V; pull to VIN for automatic startup; do not tie to VCC to avoid LDO control conflict. |
| PG | Open-drain power-good | Pulled low during soft-start or if FB falls outside 90–120% of reference; internal 5MΩ pull-up. |
| VCC | Internal 5V bias regulator output | Decouple with 1µF ceramic to PGND; powers internal logic and gate drivers. |
| FB | Feedback input | Inverting input of error amplifier; monitors output via resistor divider; also used by UVLO and PG circuits. |
| COMP | Error amplifier output | Tie to VCC for internal compensation; add RC network to GND for external loop tuning. |
| FS | Frequency selection | Tie to VCC for 500kHz; connect resistor to GND to set 300kHz–2MHz-enables EMI spread-spectrum design. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual NMOS FETs | Eliminates need for external high-side/low-side switches-reduces BOM count and PCB footprint. |
| Selectable PFM/PWM light-load mode | PFM improves light-load efficiency; forced PWM ensures fixed frequency for EMI-sensitive applications. |
| Internal or external compensation | Internal option removes external compensation components; external option allows full loop optimization for custom loads. |
| Power-good and enable functions | PG provides system-level power sequencing feedback; EN supports controlled startup/shutdown and standby modes. |
| Robust protection suite | Includes overcurrent, overtemperature, negative current limit, and boot UVLO-enables reliable operation in unregulated input environments. |
Applications
| Industrial Control | Medical Devices |
|---|---|
Use Scenario: Powering PLC I/O modules and sensor interface circuitry in factory automation cabinets with 24V DC bus. IC Role / Device Role / Timing Role: Primary 3.3V/5V step-down regulator supplying MCU, ADC, and isolated communication interfaces. Use Value: Wide 3V–40V input handles brownouts and surges on industrial rails; 125°C rating ensures reliability in enclosed enclosures. | Use Scenario: Providing regulated power to portable ultrasound front-end ASICs and analog signal chains. IC Role / Device Role / Timing Role: Compact, low-noise DC-DC converter delivering stable 1.8V/3.3V from lithium-ion battery packs. Use Value: PFM mode extends battery life; small DFN package fits tight space constraints in handheld diagnostics. |
| Portable Instrumentation | Distributed Power Supplies |
Use Scenario: Power management in handheld multimeters and data loggers using single-cell or dual-cell alkaline batteries. IC Role / Device Role / Timing Role: Efficient buck converter stepping down 3V–9V battery voltage to 3.3V for microcontroller and display driver. Use Value: 80µA quiescent current in PFM mode preserves battery runtime; no external compensation simplifies layout. | Use Scenario: Local point-of-load regulation in cloud server rack PSUs feeding FPGA, memory, and PHY ICs. IC Role / Device Role / Timing Role: Secondary regulator generating 1.2V/1.8V from intermediate 5V/12V distribution bus. Use Value: Synchronization capability aligns switching edges across multiple ISL85410FRZ-T units to suppress beat frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4420AGL-A-Z | 4.5V–60V input, 2A output, fixed 500kHz, no PFM mode, QFN-10 package | Better suited for higher-current, wider-input applications but lacks light-load efficiency optimization | Choose when input exceeds 40V or output current >1A is required; verify thermal margin with larger inductor. |
| TPS54202DRCT | 4.5V–28V input, 2A output, 500kHz–2.2MHz adjustable, Eco-mode PFM, SON-10 package | Lower max input voltage, higher current, and integrated soft-start but no SYNC pin for multi-phase sync | Prefer for cost-sensitive consumer applications with <28V input; not suitable for 36V battery or 40V industrial rail use. |
Compared with MPQ4420AGL-A-Z and TPS54202DRCT, the ISL85410FRZ-T uniquely balances 40V max input, 1A output, PFM/PWM selectability, and SYNC capability in a compact DFN-making it optimal for industrial and portable systems demanding robustness and efficiency across wide load ranges.
Availability
ISL85410FRZ-T is available at Aetrix Electronics and suitable for industrial control, medical devices, and portable instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL85410FRZ-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
Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and enterprise applications.
The ISL85410FRZ-T belongs to Renesas' ISL85xx family of integrated synchronous buck regulators, designed specifically for high-voltage industrial and battery-powered systems needing minimal external components and wide input range operation.
FAQ
What is the maximum input voltage supported by the ISL85410FRZ-T?
The ISL85410FRZ-T supports a maximum input voltage of +40V, with absolute maximum rating at +43V. This allows direct operation from standard 24V and 36V industrial power rails and 12S Li-ion battery packs without pre-regulation. Operation above 40V violates recommended conditions and may trigger overvoltage protection or damage the device.
Does the ISL85410FRZ-T require external compensation components?
No-the ISL85410FRZ-T supports both internal and external compensation. Tying the COMP pin to VCC enables internal compensation, eliminating external RC networks. For custom loop response or stability with non-standard output capacitors, connect an RC network from COMP to GND per the "Loop Compensation Design" section of the datasheet.
How does the ISL85410FRZ-T handle light-load efficiency?
The ISL85410FRZ-T improves light-load efficiency via selectable PFM mode, automatically reducing switching frequency under light loads to minimize switching losses. PFM can be enabled by grounding the SYNC pin or disabled for forced PWM operation-ensuring consistent frequency for EMI filtering and noise-sensitive applications.
Can the ISL85410FRZ-T be synchronized to an external clock source?
Yes-the ISL85410FRZ-T supports external synchronization via the SYNC pin. Apply a clean clock signal with positive-edge trigger and frequency higher than the programmed internal switching frequency (e.g., >500kHz for default setting). This enables phase alignment across multiple converters to reduce system-level ripple and EMI peaks.
What thermal performance can be expected from the ISL85410FRZ-T in a typical 4-layer PCB layout?
In a standard 4-layer PCB with the EPAD connected via ≥5 thermal vias to an internal GND plane, the ISL85410FRZ-T achieves θJA ≈ 42°C/W. At 1A output with 12V input and 3.3V output, typical power dissipation is ~0.3W, resulting in ~13°C junction-to-ambient rise-well within the -40°C to +125°C operating range even at 85°C ambient.
ISL85410FRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 1A
- Frequency - Switching:
- 500kHz, 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
ISL85410FRZ-T FAQ
1.How can I place an order for ISL85410FRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85410FRZ-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 ISL85410FRZ-T reliable?
The price and inventory of ISL85410FRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85410FRZ-T is usually 5 days.
3.What payment methods are accepted for ISL85410FRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85410FRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85410FRZ-T?
ISL85410FRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85410FRZ-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 ISL85410FRZ-T?
For technical support, including ISL85410FRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85410FRZ-T requirements.
6.How does Aetrix verify that ISL85410FRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL85410FRZ-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 ISL85410FRZ-T meets industry standards.
7.What is the process for return or replacement of ISL85410FRZ-T?
All ISL85410FRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL85410FRZ-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 ISL85410FRZ-T part is unused and in its original packaging.
Return procedure for ISL85410FRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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