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Renesas ISL85410FRZ
- Part No.:
- ISL85410FRZ
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85410FRZ.pdf
- Description:
- IC REG BUCK ADJ 1A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,169
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Product details
Overview
ISL85410FRZ from Renesas Electronics is a wide-input synchronous buck regulator delivering up to 1A continuous output current with 3V–40V input range, integrated high-side/low-side NMOS FETs, 500kHz default switching frequency (adjustable 300kHz–2MHz), and selectable PFM/PWM light-load operation - deployed in industrial control power rails and battery-powered instrumentation.
For engineers reviewing the ISL85410FRZ datasheet, ISL85410FRZ pinout, ISL85410FRZ application, or ISL85410FRZ equivalent, key selection criteria include its -40°C to +125°C operating temperature, internal/external compensation flexibility, power-good signaling, soft-start programmability, and DFN-12 4mm×3mm package compatibility with high-density PCB layouts.
Technical Context
The ISL85410FRZ implements peak current-mode PWM control with slope compensation (450mV/T) and a 500mV/A current sense trans-resistance for stable loop response across input and load variations. Its error amplifier offers dual transconductance modes: 50µA/V for internal compensation and 230µA/V for external RC networks.
Light-load behavior is managed via SYNC pin logic: tied low for automatic PFM/PWM transition, high for forced PWM, or driven by external clock for synchronization. Overcurrent protection uses a 1.5A typical positive peak limit with 17-clock-pulse blanking and hiccup-mode recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports unregulated battery, automotive, and industrial DC sources 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 optimization of efficiency vs. size trade-offs. |
| Feedback Reference Voltage | 0.599V ±10mV over -40°C to +125°C - ensures tight output regulation accuracy across full temperature range. |
| Power-Good Threshold | ±6% window around VFB (90–120% of reference) - provides reliable system-level power sequencing and fault detection. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects against sustained overload or poor heatsinking in enclosed environments. |
| Quiescent Current | 80µA at light load (PFM mode) - extends battery life in always-on portable instrumentation. |
Pinout & Package
ISL85410FRZ is housed in a RoHS-compliant, thermally enhanced 12-lead DFN package (4mm × 3mm, L12.4x3), featuring an exposed thermal pad (EPAD) requiring ≥5 vias to GND plane for optimal thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SS | Soft-start timing control | Capacitor-to-ground sets ramp time; tie to VCC for fixed 2ms internal soft-start - prevents inrush current during power-up. |
| SYNC | Mode selection & sync input | Logic level selects PFM (low), forced PWM (high), or external clock sync - enables system-level timing coordination. |
| BOOT | Bootstrap supply | Connects 100nF capacitor to PHASE - supplies gate drive voltage for high-side NMOS, enabling efficient synchronous operation. |
| VIN | Main power input | Supplies both power stage and internal LDO; requires ≥4.7µF ceramic decoupling close to pin - critical for stability under transient loads. |
| PHASE | Switch node | Drives external inductor; connects internal high/low-side FETs - must be routed with minimal loop area to reduce EMI and switching losses. |
| PGND | Power ground return | Dedicated low-impedance path for high-current switch node return - separate from signal GND to avoid noise coupling into feedback. |
| EN | Enable control | Active-high input; >1V enables regulator - allows sequenced startup or system-level power management via MCU GPIO. |
| PG | Open-drain power-good | Pulled low during soft-start or out-of-regulation; internal 5MΩ pull-up - signals host controller when VOUT is stable and within spec. |
| VCC | Bias LDO output | 5V ±0.6V regulated supply for internal circuitry; decouple with 1µF ceramic to PGND - powers control logic and gate drivers. |
| FB | Feedback input | Inverting input to error amplifier; monitors output via resistor divider - sets output voltage as VOUT = 0.599V × (1 + R2/R3). |
| COMP | Error amplifier output | Connect to VCC for internal compensation; add RC network to GND for external loop tuning - enables robust stability across varied output caps. |
| FS | Frequency selection | Tie to VCC for 500kHz; resistor-to-GND sets 300kHz–2MHz - allows EMI reduction or inductor size optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated NMOS FETs | High-side RDS(on) = 350mΩ max, low-side RDS(on) = 130mΩ max - eliminates external MOSFETs and gate drivers, reducing BOM count and layout complexity. |
| Selectable PFM/PWM mode | SYNC pin configures light-load operation - PFM boosts efficiency at <100mA; PWM maintains fixed frequency for predictable EMI filtering. |
| Internal/external compensation | COMP pin supports either internal (no external components) or external RC network - accelerates design while retaining loop tuning flexibility. |
| Robust protection suite | Includes overcurrent (1.5A peak), overtemperature (150°C), boot undervoltage, and negative current limiting (-0.6A) - ensures safe operation under fault conditions. |
| Power-good and soft-start | PG open-drain output and SS programmable ramp - enable reliable system power sequencing and prevent inrush damage to downstream loads. |
Applications
| Industrial Control Power Supply | Portable Medical Instrumentation |
|---|---|
Use Scenario: Providing isolated 3.3V/5V rail for PLC I/O modules operating from 24VDC field bus. IC Role / Device Role / Timing Role: Primary non-isolated buck converter regulating auxiliary power for microcontroller, ADC, and digital isolators. Use Value: Wide 3V–40V input handles brownouts and surges common in factory environments; 125°C rating ensures reliability in enclosed cabinets. |
Use Scenario: Powering handheld glucose meters and pulse oximeters from single-cell Li-ion (3.0–4.2V) or AA batteries. IC Role / Device Role / Timing Role: Main step-down regulator generating stable 1.8V/3.3V for sensor front-end and BLE SoC. Use Value: 80µA quiescent current in PFM mode extends battery runtime; small DFN package fits compact handheld enclosures. |
| Distributed Cloud Infrastructure PSU | Automotive Body Control Module |
Use Scenario: Generating 5V/12V intermediate rails for FPGA configuration, memory, and interface ICs in server rack PSUs. IC Role / Device Role / Timing Role: Secondary buck stage converting 12V backplane to point-of-load voltages with tight regulation. Use Value: 500kHz switching enables compact 22µH inductors; power-good signal coordinates FPGA configuration sequence. |
Use Scenario: Regulating 5V for CAN transceivers, LIN controllers, and LED drivers in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: High-vin buck converter tolerant of load-dump transients (up to 40V) and cold-crank dips (down to 3V). Use Value: Absolute max VIN = 43V and thermal shutdown protect against automotive electrical anomalies; AEC-Q200 not claimed but industrial temp grade supports under-hood use. |
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 | 3.3V–36V input, 0.6A output, fixed 2MHz switching, no PFM mode, smaller TSOT23-6 package | Limited to lower current and narrower VIN; lacks light-load efficiency optimization and power-good output | Choose for space-constrained, low-power applications where fixed frequency and simplicity outweigh efficiency needs. |
| TPS54202DRCT | 4.5V–28V input, 2A output, 500kHz–2.5MHz adjustable, integrated soft-start, no internal compensation option | Higher current capability but narrower input range; requires external compensation network for all designs | Prefer when >1A load or tighter input voltage constraints apply, and when external loop tuning is acceptable. |
Compared with MP2451DT-LF-Z and TPS54202DRCT, the ISL85410FRZ uniquely combines ultra-wide 3V–40V input, 1A capability, PFM/PWM selectability, internal/external compensation, and power-good signaling - making it optimal for ruggedized industrial and battery-backed systems demanding both flexibility and reliability.
Availability
ISL85410FRZ is available at Aetrix Electronics and suitable for industrial control, portable medical instrumentation, and distributed cloud infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL85410FRZ 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 connectivity solutions for automotive, industrial, and datacenter markets.
The ISL85410FRZ belongs to Renesas' ISL85xx family of wide-input synchronous buck regulators, engineered for high-reliability power conversion in harsh environments where input voltage variation, thermal stress, and long product lifecycles are critical design factors.
FAQ
What is the maximum input voltage rating for the ISL85410FRZ?
The ISL85410FRZ has an absolute maximum input voltage rating of +43V relative to GND, with recommended operating range from +3V to +40V. This 40V upper limit enables direct connection to 24V industrial buses and 36V battery systems while maintaining margin against transients. Operation beyond 40V risks permanent damage even if duration is brief.
Does the ISL85410FRZ support external frequency synchronization?
Yes, the ISL85410FRZ supports external synchronization via the SYNC pin, which accepts a positive-edge-triggered clock signal higher than the programmed switching frequency. When driven by an external source, the ISL85410FRZ locks its internal oscillator to that clock - enabling EMI reduction through frequency dithering or system-level timing alignment across multiple converters.
How is output voltage set on the ISL85410FRZ?
The ISL85410FRZ uses a resistor divider from VOUT to FB and from FB to GND to set output voltage per the equation VOUT = 0.599V × (1 + R2/R3). The FB pin's 0.599V reference is trimmed across temperature, ensuring stable regulation. Standard values like 90.9kΩ (R2) and 4.75kΩ (R3) yield 5.0V; 90.9kΩ and 20kΩ yield 3.3V - as confirmed in Table 1 of the FN8375 datasheet.
Can the ISL85410FRZ operate with only internal compensation?
Yes, the ISL85410FRZ supports fully internal compensation: tying the COMP pin directly to VCC activates the built-in 50µA/V transconductance amplifier and internal compensation network. This eliminates external RC components, simplifying design for standard 3.3V/5V outputs with typical ceramic output capacitors - verified in Figure 3 ("Internal Default Parameter Selection") of the datasheet.
What thermal performance can be expected from the ISL85410FRZ in a 4-layer PCB?
In a standard 4-layer PCB with 1oz copper, 5 thermal vias under the EPAD, and 1in² of 2oz copper pour connected to PGND, the ISL85410FRZ achieves θJA ≈ 42°C/W (per datasheet). At 1A load and 24V input, typical power dissipation is ~0.5W, resulting in ~21°C junction-to-ambient rise - well within the -40°C to +125°C operating range, even at 85°C ambient.
ISL85410FRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ISL85410FRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85410FRZ 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 reliable?
The price and inventory of ISL85410FRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85410FRZ is usually 5 days.
3.What payment methods are accepted for ISL85410FRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85410FRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85410FRZ?
ISL85410FRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85410FRZ 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?
For technical support, including ISL85410FRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85410FRZ requirements.
6.How does Aetrix verify that ISL85410FRZ is sourced from the original manufacturer or authorized distributors?
All ISL85410FRZ 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 meets industry standards.
7.What is the process for return or replacement of ISL85410FRZ?
All ISL85410FRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL85410FRZ, 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 part is unused and in its original packaging.
Return procedure for ISL85410FRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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