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Renesas ISL85410FRZ-T7A
- Part No.:
- ISL85410FRZ-T7A
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85410FRZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 1A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,295
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Product details
Overview
ISL85410FRZ-T7A from Renesas is a wide-input (3V–40V), 1A synchronous buck regulator with integrated high-side and low-side NMOS FETs, 500kHz default switching frequency (adjustable 300kHz–2MHz), PFM/PWM light-load mode selection, and internal/external compensation - used in industrial power rails, medical instrumentation, and distributed cloud infrastructure supplies.
For engineers reviewing the ISL85410FRZ-T7A datasheet, ISL85410FRZ-T7A pinout, ISL85410FRZ-T7A application, or ISL85410FRZ-T7A equivalent, key selection criteria include input voltage range, integrated MOSFET RDS(on) (250mΩ/90mΩ), soft-start control, power-good signaling, and thermal shutdown at 150°C with 20°C hysteresis.
Technical Context
The ISL85410FRZ-T7A implements peak current-mode PWM control with slope compensation (450mV/T) and a transconductance error amplifier (50µA/V internal / 230µA/V external). It features automatic PFM-to-PWM transition via SYNC pin logic and zero-current detection for discontinuous conduction mode efficiency optimization.
Its protection architecture includes overcurrent limiting (1.5A typical peak, -0.6A negative limit), boot undervoltage lockout, over-temperature shutdown (150°C rising, 130°C falling), and power-good window monitoring (±6% VFB thresholds) with open-drain PG output and internal 5MΩ pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V DC - supports 12V/24V/36V industrial buses and wide-range battery inputs without pre-regulation. |
| Output Current | Continuous 1A - sufficient for FPGA I/O banks, microcontroller cores, and sensor signal chains. |
| Switching Frequency | Default 500kHz; programmable 300kHz–2MHz via FS pin resistor - enables trade-off between size (higher fSW) and efficiency (lower fSW). |
| FET RDS(on) | High-side: 350mΩ max; low-side: 130mΩ max @ 100mA - minimizes conduction loss and thermal rise in compact DFN package. |
| Feedback Reference | 0.599V ±1.2mV (–40°C to +125°C) - enables precise output regulation across temperature with minimal drift. |
| Soft-Start Time | Internally fixed 2ms when SS tied to VCC; externally adjustable via SS-to-GND capacitor - prevents inrush current into bulk capacitance. |
| Thermal Shutdown | 150°C trip with 20°C hysteresis - ensures safe operation under sustained overload or poor PCB heatsinking. |
Pinout & Package
ISL85410FRZ-T7A is housed in a RoHS-compliant, thermally enhanced 12-lead DFN package (4mm × 3mm, 0.5mm pitch) with exposed thermal pad (EPAD) requiring ≥5 vias to GND plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS | Soft-start timing control | Capacitor-to-GND sets ramp time; tie to VCC for fixed 2ms internal soft-start. |
| 2 SYNC | Mode selection & synchronization input | Logic high = forced PWM; logic low = PFM; floating = auto-select; external clock edge-triggered sync source. |
| 3 BOOT | Bootstrap supply for high-side gate driver | Requires 100nF ceramic capacitor to PHASE; enables NMOS high-side drive without external charge pump. |
| 4 VIN | Main power input | Supplies both power stage and internal LDO; requires ≥4.7µF ceramic decoupling close to pin. |
| 5 PHASE | Switch node | Connects internal FETs to external inductor; critical for layout EMI and efficiency. |
| 6 PGND | Power ground return | Must connect directly to system GND plane - separate from signal GND to minimize noise coupling. |
| 7 EN | Enable control | Active-high; >1V enables regulator; tie to VIN for automatic startup; not compatible with VCC connection. |
| 8 PG | Open-drain power-good output | Pulled low during soft-start, UVLO, or fault; high-impedance when VOUT stable within ±6% window. |
| 9 VCC | Internal 5V LDO output | Supplies bias circuitry; decouple with 1µF ceramic to PGND; regulated 4.5–5.7V over load/temperature. |
| 10 FB | Feedback input | Inverting input of error amplifier; sets output voltage via resistor divider; monitors regulation for PG and UVLO. |
| 11 COMP | Error amplifier output | Tie to VCC for internal compensation; RC network to GND enables custom loop tuning for stability. |
| 12 FS | Frequency selection | Tie to VCC for 500kHz; resistor-to-GND selects 300kHz–2MHz - sets oscillator timing with ±10% tolerance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual NMOS FETs | Eliminates need for external high-side switch and gate driver, reducing BOM count and layout complexity. |
| Selectable PFM/PWM light-load mode | Extends battery life in portable instrumentation by maintaining >85% efficiency at 10mA load (VIN=12V, VOUT=3.3V). |
| Internal or external compensation | Enables rapid prototyping with internal compensation or optimized transient response using external RC network. |
| Power-good and enable functions | Allows sequencing with other rails and safe system startup; PG provides fault indication without external monitoring IC. |
| Robust protection suite | Includes overcurrent, overtemperature, boot UVLO, and negative current limit - reduces need for external fault management. |
Applications
| Industrial Control Power | Medical Sensor Supply |
|---|---|
|
Use Scenario: Providing isolated 5V/3.3V rails for PLC I/O modules operating from 24VDC field bus. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering regulated output with high line rejection and thermal resilience. Use Value: Wide 3V–40V input accommodates bus voltage sag and surge; 125°C ambient rating ensures reliability in enclosed cabinets. |
Use Scenario: Powering low-noise analog front-ends and ADCs in portable ultrasound or patient monitors. IC Role / Device Role / Timing Role: Clean, low-ripple point-of-load regulator with fast transient response to dynamic sensor loads. Use Value: PFM mode maintains >90% efficiency at µA-level standby currents; soft-start prevents sensor reset on power-up. |
| Distributed Cloud PSU | Portable Instrumentation |
|
Use Scenario: Generating 12V intermediate rail from 48V backplane in modular server power distribution units. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting parallel operation and thermal derating. Use Value: Adjustable frequency avoids noise coupling with adjacent clock domains; PG signal enables hot-swap sequencing. |
Use Scenario: Battery-powered handheld test equipment requiring long runtime and stable 3.3V core voltage. IC Role / Device Role / Timing Role: Main system regulator with ultra-low quiescent current (80µA) and shutdown current (2µA). Use Value: Light-load PFM extends battery life; compact 4×3mm DFN saves board space in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z (Monolithic Power) | 3.3V–36V input, 0.6A output, fixed 2MHz fSW, no PFM mode, smaller 8-pin SOIC package | Limited to lower current and narrower input range; lacks light-load efficiency optimization | Choose for cost-sensitive, space-constrained designs where 0.6A output suffices and fixed 2MHz simplifies filtering. |
| TPS54202DRCT (Texas Instruments) | 4.5V–28V input, 2A output, 500kHz–2.2MHz adjustable fSW, Eco-mode PFM, integrated compensation | Higher current capability but narrower input range; requires external bootstrap diode in some configurations | Choose when 2A output is required and input stays within 4.5V–28V; verify bootstrap reliability in high-VIN cases. |
Compared with MP2451DT-LF-Z and TPS54202DRCT, the ISL85410FRZ-T7A uniquely combines 40V max input, true 1A continuous output, integrated dual NMOS, and seamless PFM/PWM transition - making it optimal for ruggedized industrial and wide-battery-range applications where input uncertainty and light-load efficiency are critical.
Availability
ISL85410FRZ-T7A is available at Aetrix Electronics and suitable for industrial control, medical device, and cloud infrastructure applications requiring stable component supply, extended temperature operation (–40°C to +125°C), and long-term manufacturing continuity.
Supply support for ISL85410FRZ-T7A 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 datacenter markets.
The ISL85410FRZ-T7A belongs to Renesas' high-voltage buck regulator product line, engineered for robustness in harsh environments and simplified design in space- and thermal-constrained systems.
FAQ
What is the maximum input voltage supported by the ISL85410FRZ-T7A?
The ISL85410FRZ-T7A supports an absolute maximum input voltage of +43V, with recommended operation from +3V to +40V DC. This wide range enables direct connection to unregulated 24V/36V industrial buses and 12-cell Li-ion battery packs without external pre-regulation, while maintaining full functionality and protection integrity across the entire range.
How does the ISL85410FRZ-T7A handle light-load efficiency?
The ISL85410FRZ-T7A uses selectable pulse-frequency modulation (PFM) mode to maintain high efficiency at light loads - achieving >85% efficiency at 10mA output with 12V input and 3.3V output. The SYNC pin controls mode selection: logic low enables PFM, logic high forces PWM, and floating allows automatic transition based on load current.
Can the ISL85410FRZ-T7A be synchronized to an external clock?
Yes, the ISL85410FRZ-T7A supports external clock synchronization via the SYNC pin. When driven with a clean TTL/CMOS clock signal having positive-edge trigger and frequency higher than the programmed internal switching frequency (300kHz–2MHz), the regulator locks to the external source - enabling noise reduction in sensitive mixed-signal systems and deterministic timing in multi-rail power architectures.
What thermal management provisions does the ISL85410FRZ-T7A include?
The ISL85410FRZ-T7A integrates over-temperature protection with a 150°C rising threshold and 20°C hysteresis, plus a thermally enhanced 12-lead DFN package featuring an exposed EPAD. For reliable operation, the EPAD must be connected to the PCB ground plane using at least five thermal vias - ensuring junction-to-board thermal resistance (θJB) remains ≤4.5°C/W and enabling full 1A output at +125°C ambient.
Does the ISL85410FRZ-T7A require external compensation components?
No - the ISL85410FRZ-T7A supports both internal and external compensation. Tying the COMP pin to VCC activates internal compensation, eliminating external components. For custom loop response, connect an RC network from COMP to GND; the error amplifier's transconductance is 230µA/V in this configuration, enabling precise bandwidth and phase margin tuning per application requirements.
ISL85410FRZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-T7A FAQ
1.How can I place an order for ISL85410FRZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85410FRZ-T7A 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-T7A reliable?
The price and inventory of ISL85410FRZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85410FRZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL85410FRZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85410FRZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85410FRZ-T7A?
ISL85410FRZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85410FRZ-T7A 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-T7A?
For technical support, including ISL85410FRZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85410FRZ-T7A requirements.
6.How does Aetrix verify that ISL85410FRZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL85410FRZ-T7A 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-T7A meets industry standards.
7.What is the process for return or replacement of ISL85410FRZ-T7A?
All ISL85410FRZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL85410FRZ-T7A, 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-T7A part is unused and in its original packaging.
Return procedure for ISL85410FRZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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