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Renesas ISL85415FRZ-T
- Part No.:
- ISL85415FRZ-T
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85415FRZ-T.pdf
- Description:
- IC REG BUCK ADJ 500MA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,795
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Product details
Overview
ISL85415FRZ-T from Renesas Electronics is a wide-input synchronous buck regulator delivering up to 500mA output current with 3V–36V input range, integrated high-side/low-side NMOS FETs, and selectable PFM/PWM light-load operation. It operates at a default 500kHz switching frequency (adjustable 300kHz–2MHz), supports internal or external compensation, and features power-good, enable, and soft-start functions - ideal for industrial control, medical devices, and portable instrumentation.
For engineers reviewing the ISL85415FRZ-T datasheet, ISL85415FRZ-T pinout, ISL85415FRZ-T application, or ISL85415FRZ-T equivalent, key selection criteria include its -40°C to +125°C operating temperature, 12-lead DFN (4mm × 3mm) package, integrated MOSFETs eliminating external gate drivers, and robust protection features including overcurrent, thermal shutdown, and negative current limiting.
Technical Context
The ISL85415FRZ-T implements peak-current-mode control with an internal 0.6V reference and transconductance error amplifier (gm = 230µA/V with external compensation). Its PWM/PFM mode selection is controlled via the SYNC pin, enabling automatic light-load efficiency optimization without external circuitry.
It integrates a 5V bias LDO (VCC), bootstrap gate driver for the high-side NMOS, and internal current sensing with 0.9A typical peak current limit. The device supports synchronization to external clocks up to 2MHz and includes programmable minimum on/off times (90ns/150ns) for stable operation across wide VIN–VOUT ratios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - enables direct battery or unregulated industrial rail operation without pre-regulation. |
| Output Current | 500mA continuous - sufficient for powering microcontrollers, sensors, and communication ICs in compact systems. |
| Switching Frequency | Default 500kHz; adjustable 300kHz–2MHz via FS pin resistor - balances efficiency, size, and EMI requirements. |
| Feedback Reference | 0.600V ±1% - allows precise output voltage setting with standard resistor dividers and low-power monitoring. |
| Operating Temp | -40°C to +125°C - qualified for harsh industrial and automotive under-hood environments. |
| Package | 12-lead DFN (4mm × 3mm, 0.5mm pitch) - compact footprint with exposed thermal pad for efficient heat dissipation. |
| Protection Features | Overcurrent (0.9A peak), thermal shutdown (150°C), negative current limit (-0.4A), boot UVLO - ensures robust field reliability. |
Pinout & Package
The ISL85415FRZ-T is housed in a RoHS-compliant, thermally enhanced 12-lead DFN package (4mm × 3mm, 0.5mm pitch) with an exposed thermal pad (EPAD) that must be soldered to the PCB ground plane using ≥5 vias for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SS | Soft-start timing control | Capacitor-to-ground sets ramp time; tied to VCC enables fixed 2ms internal soft-start - prevents inrush current during power-up. |
| SYNC | Mode selection & sync input | Logic level selects PFM/PWM; floating enables auto-mode; external clock input synchronizes switching - eliminates beat frequencies in multi-rail systems. |
| BOOT | Bootstrap supply for high-side gate | Connects 100nF capacitor to PHASE - provides gate drive voltage above VIN for NMOS high-side switch conduction. |
| VIN | Main power input | Supplies both power stage and internal LDO; requires ≥4.7µF ceramic decoupling close to pin - ensures stable bias and transient response. |
| PHASE | Switch node | Connects to external inductor - carries high di/dt switching waveform; layout critical for EMI and efficiency. |
| PGND | Power ground return | Low-impedance path for high-current inductor return - must connect directly to system GND plane, separate from signal ground. |
| EN | Enable control | Logic-high (>1V) enables regulator; tied to VIN enables auto-start - independent of VCC, preventing latch-up during brownout. |
| PG | Open-drain power-good | Pulled low during soft-start or undervoltage; internal 5MΩ pull-up - signals system controller when VOUT is within ±6% regulation window. |
| VCC | Internal 5V LDO output | Decoupled with 1µF ceramic to PGND - powers internal logic; not intended as system supply rail. |
| FB | Feedback input | Inverting input of error amplifier; monitors output via resistor divider - sets VOUT = 0.6V × (1 + R2/R1); leakage <100nA preserves accuracy. |
| COMP | Error amplifier output | Tied to VCC enables internal compensation; RC network to GND enables external loop tuning - simplifies stability design across loads. |
| FS | Frequency selection | Tied to VCC = 500kHz; resistor to GND sets 300kHz–2MHz - enables EMI optimization and inductor size trade-offs. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated NMOS FETs | Eliminates external gate drivers and discrete MOSFETs - reduces BOM count by ≥4 components and board area by >30%. |
| Selectable PFM/PWM | Enables >85% efficiency at 1mA load (PFM) while maintaining tight regulation at full load (PWM) - extends battery life without sacrificing transient response. |
| Internal/External Compensation | Single-pin COMP configuration supports either no-external-component design (internal) or precision loop tuning (external RC) - accelerates prototyping and production validation. |
| Robust Protection Suite | Includes hiccup-mode overcurrent, -400mA negative current limit, and 20°C thermal hysteresis - prevents damage during short-circuit, reverse polarity, or overheating events. |
| Wide Temperature Range | Specified from -40°C to +125°C junction - validated for use in industrial PLCs, motor drives, and outdoor telecom equipment without derating. |
Applications
| Industrial Control | Medical Devices |
|---|---|
Use Scenario: Powering PLC I/O modules and sensor interfaces in factory automation cabinets with 24V DC rails. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator converting unregulated 24V to MCU and ADC supply rails. Use Value: Wide 3V–36V input handles brownouts and surges; integrated FETs reduce thermal stress in confined enclosures. | Use Scenario: Supplying isolated data acquisition front-ends in portable ultrasound and patient monitors. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current buck converter for analog signal chain and microcontroller subsystems. Use Value: PFM mode achieves <10µA quiescent current at light load - extends battery runtime between charges. |
| Portable Instrumentation | Distributed Power Supplies |
Use Scenario: Regulating power for handheld test equipment with Li-ion battery input (3.0–4.2V) and 12V boost-derived rails. IC Role / Device Role / Timing Role: Input-flexible buck stage stepping down battery or boosted voltage to 1.8V/3.3V logic supplies. Use Value: 90ns minimum on-time supports high step-down ratios (e.g., 12V→1.8V at 500kHz) without pulse-skipping instability. | Use Scenario: Providing secondary 5V/3.3V rails in server rack power distribution units with 48V backplane input. IC Role / Device Role / Timing Role: Compact, thermally efficient POL regulator distributed across motherboard or mezzanine cards. Use Value: DFN package with EPAD enables >2W dissipation in <12mm² footprint - supports high-density power architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS565201RHLR | 4.5V–17V input, 5A output, 500kHz fixed frequency, no PFM mode, smaller 3mm × 2mm QFN | Optimized for higher-current, lower-VIN applications; lacks light-load efficiency optimization | Choose for cost-sensitive, high-current designs where input is tightly regulated ≤17V. |
| MP2451DT-LF-Z | 4.5V–36V input, 0.6A output, 2MHz fixed frequency, no SYNC or PG pins, larger SOIC-8 package | Lacks power-good signaling and synchronization capability; simpler feature set for basic conversion | Choose when board space permits SOIC-8 and system-level fault signaling is not required. |
Compared with TPS565201RHLR and MP2451DT-LF-Z, the ISL85415FRZ-T uniquely combines ultra-wide 3V–36V input, integrated PFM/PWM mode selection, open-drain PG output, and 12-lead DFN thermal performance - making it optimal for ruggedized, battery-backed, or multi-rail industrial systems requiring design flexibility and long-term supply stability.
Availability
ISL85415FRZ-T is available at Aetrix Electronics and suitable for industrial control, medical devices, and portable instrumentation requiring stable component supply, extended temperature operation, and long-lifecycle support.
Supply support for ISL85415FRZ-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, infrastructure, and IoT markets.
The ISL85415FRZ-T belongs to Renesas' Power Management portfolio, designed specifically for high-reliability, wide-input DC-DC conversion in space-constrained industrial and medical applications where input voltage variation and thermal resilience are critical.
FAQ
What is the maximum input voltage rating for the ISL85415FRZ-T?
The ISL85415FRZ-T has an absolute maximum input voltage rating of +42V, with recommended operation from 3V to 36V. This wide range allows direct connection to 24V industrial rails, 36V battery stacks, or PoE-powered systems without external pre-regulation - but sustained operation above 36V violates recommended conditions and risks reliability degradation.
Does the ISL85415FRZ-T require external compensation components?
No - the ISL85415FRZ-T supports both internal and external compensation. When the COMP pin is tied to VCC, internal compensation is enabled and no external components are needed. For custom loop response or demanding transient requirements, an RC network from COMP to GND enables full external compensation - giving designers flexibility without mandatory external parts.
How does the ISL85415FRZ-T handle light-load efficiency?
The ISL85415FRZ-T improves light-load efficiency via selectable PFM mode, activated by pulling the SYNC pin low or leaving it floating. In PFM, it reduces switching frequency and peak current to maintain >85% efficiency at 1mA load - unlike forced-PWM regulators that suffer significant quiescent losses below 10% load.
What thermal performance can be expected from the ISL85415FRZ-T in its DFN package?
The ISL85415FRZ-T in its 12-lead DFN package delivers θJA = 44°C/W (typical) and θJC = 5.5°C/W (typical) when properly mounted with the EPAD soldered to a 4-layer PCB with ≥5 thermal vias. At 500mA output and 24V input, junction temperature rise remains <35°C above ambient - enabling reliable operation without heatsinks in most industrial enclosures.
Can the ISL85415FRZ-T be synchronized to an external clock source?
Yes - the ISL85415FRZ-T supports external synchronization via the SYNC pin, accepting positive-edge-triggered clock signals from 300kHz to 2MHz. This allows noise-sensitive systems (e.g., medical imaging or precision ADCs) to align switching edges and avoid beat frequencies, while maintaining full PFM/PWM mode control functionality.
ISL85415FRZ-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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 500mA
- 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)
ISL85415FRZ-T FAQ
1.How can I place an order for ISL85415FRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85415FRZ-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 ISL85415FRZ-T reliable?
The price and inventory of ISL85415FRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85415FRZ-T is usually 5 days.
3.What payment methods are accepted for ISL85415FRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85415FRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85415FRZ-T?
ISL85415FRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85415FRZ-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 ISL85415FRZ-T?
For technical support, including ISL85415FRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85415FRZ-T requirements.
6.How does Aetrix verify that ISL85415FRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL85415FRZ-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 ISL85415FRZ-T meets industry standards.
7.What is the process for return or replacement of ISL85415FRZ-T?
All ISL85415FRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL85415FRZ-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 ISL85415FRZ-T part is unused and in its original packaging.
Return procedure for ISL85415FRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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