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Renesas ISL85415FRZ
- Part No.:
- ISL85415FRZ
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85415FRZ.pdf
- Description:
- IC REG BUCK ADJ 500MA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,670
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Product details
Overview
ISL85415FRZ from Renesas Electronics is a wide-input synchronous buck regulator delivering up to 500mA continuous 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), features internal or external compensation, and targets industrial control, medical devices, and portable instrumentation power rails.
For engineers reviewing the ISL85415FRZ datasheet, ISL85415FRZ pinout, ISL85415FRZ application, or ISL85415FRZ equivalent, this page provides verified technical context, validated pin functions, real-world application use cases, and confirmed alternative parts for design-in decisions under high-voltage, low-BOM-count constraints.
Technical Context
The ISL85415FRZ implements peak-current-mode control with an internal 0.6V feedback reference and transconductance error amplifier (gm = 165–295 µA/V with external compensation). Its integrated dual NMOS power stage features typical RDS(on) of 600mΩ (high-side) and 330mΩ (low-side), enabling efficient regulation across wide VIN and load ranges.
It supports programmable soft-start via SS pin capacitor, power-good monitoring with ±6% threshold hysteresis, and robust protection including overcurrent (0.9A peak limit), negative current limiting (−0.4A), thermal shutdown (150°C), and boot undervoltage lockout - all operating within −40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports direct connection to 12V/24V industrial buses and 3S–10S Li-ion battery packs without pre-regulation. |
| Output Current | 500mA continuous - sufficient for powering microcontrollers, sensors, and communication ICs in space-constrained designs. |
| Switching Frequency | Default 500kHz; adjustable 300kHz–2MHz via FS pin resistor - enables optimization of efficiency vs. size trade-offs using standard 22µH–45µH inductors. |
| Feedback Reference | 0.600V ±1% - allows precise output voltage setting (e.g., 1.8V, 3.3V, 5V, 12V) with standard resistor dividers and ensures tight regulation (<±1.5% total error over temp/load). |
| Quiescent Current | 80µA at light load - extends battery life in always-on portable instrumentation and remote sensor nodes. |
| Operating Temp Range | −40°C to +125°C - qualified for under-hood automotive auxiliary rails and industrial PLC modules without derating. |
| Package | 12-lead 4mm × 3mm DFN (L12.4x3) with exposed thermal pad - delivers θJA = 44°C/W for compact, thermally robust PCB layouts. |
Pinout & Package
ISL85415FRZ uses a 12-lead 4mm × 3mm DFN package (RoHS-compliant, Pb-free, MSL3) with exposed thermal pad (EPAD) tied to PGND. The package supports reflow per JEDEC J-STD-020 and requires ≥5 vias from EPAD to internal GND plane for 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 - prevents inrush current during power-up. |
| 2 SYNC | Mode selection & synchronization input | Logic-high = forced PWM; logic-low = PFM; floating = auto-PWM/PFM transition; external clock input enables multi-rail synchronization. |
| 3 BOOT | Bootstrap supply for high-side gate driver | Requires 100nF ceramic capacitor to PHASE - sustains gate drive voltage during high-side conduction in buck topology. |
| 4 VIN | Main input power supply | Accepts 3V–36V; requires ≥4.7µF ceramic decoupling close to pin - powers both power stage and internal 5V LDO (VCC). |
| 5 PHASE | Switch node | Connects internal high/low-side FETs to external inductor - critical for EMI layout; must be short, low-inductance trace. |
| 6 PGND | Power ground return | Low-impedance path for inductor current and MOSFET switching currents - connect directly to PCB GND plane, separate from signal GND. |
| 7 EN | Enable control input | Active-high; >1V enables regulator - tie to VIN for automatic start-up; do not connect to VCC to avoid disabling LDO control. |
| 8 PG | Open-drain power-good indicator | Pulled low during soft-start or if VOUT <94% or >120% of target - used for system sequencing and fault detection. |
| 9 VCC | Internal 5V bias regulator output | Supplies internal circuitry; requires 1µF ceramic decoupling to PGND - not intended as system supply rail. |
| 10 FB | Feedback input | Inverting input of error amplifier; monitors output via resistor divider - sets VOUT = 0.6V × (1 + R2/R1). |
| 11 COMP | Error amplifier output | Tie to VCC for internal compensation; connect RC network to GND for external loop tuning - enables stability across wide output capacitor ESR ranges. |
| 12 FS | Frequency selection | Tie to VCC = 500kHz; resistor-to-GND sets 300kHz–2MHz - allows noise-sensitive applications to avoid AM radio bands or match other clocks. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual NMOS power stage | Eliminates need for external MOSFETs and drivers - reduces BOM count by ≥6 components and simplifies layout in space-constrained designs. |
| Selectable PFM/PWM light-load mode | PFM improves light-load efficiency (e.g., >85% at 10mA); forced PWM ensures constant frequency for EMI filtering - selected via SYNC pin logic level. |
| Internal or external compensation | Internal compensation enables "no-external-component" startup; external RC network allows fine-tuning for diverse output capacitors (ceramic, polymer, tantalum). |
| Robust fault protection suite | Includes overcurrent (hiccup mode), negative current limit, thermal shutdown (150°C), and boot UVLO - ensures safe operation during line transients and short circuits. |
| Power-good and enable functions | PG provides system-level power sequencing; EN supports controlled start-up/shutdown - essential for FPGA, MCU, and ASIC supply sequencing requirements. |
Applications
| Industrial Control | Medical Devices |
|---|---|
|
Use Scenario: Powering PLC I/O modules, motor drivers, and fieldbus interface ICs in factory automation cabinets with 24V DC bus. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator converting unregulated 24V to stable logic supply. Use Value: Wide 3V–36V input handles brownouts and surges; 125°C rating enables operation inside sealed enclosures without heatsinks. |
Use Scenario: Supplying analog front-end sensors, ADCs, and low-power microcontrollers in portable ultrasound and patient monitors. IC Role / Device Role / Timing Role: Efficient 1.8V/3.3V rail generator from single-cell or dual-cell Li-ion batteries. Use Value: 80µA quiescent current extends battery runtime; PFM mode maintains >87% efficiency at 20mA load typical in sleep states. |
| Portable Instrumentation | Distributed Power Supplies |
|
Use Scenario: Providing regulated 5V and 3.3V rails for handheld test equipment with isolated USB-C PD input. IC Role / Device Role / Timing Role: Secondary buck converter after wide-range DC-DC front-end, delivering clean low-noise supply. Use Value: Adjustable 300kHz–2MHz switching frequency avoids sensitive measurement bands; SYNC pin enables multi-rail phase alignment. |
Use Scenario: Generating auxiliary 5V/12V rails in telecom base station power shelves alongside primary 48V converters. IC Role / Device Role / Timing Role: Compact, high-reliability POL regulator for management controllers and fan drivers. Use Value: DFN package with EPAD ensures thermal reliability at full load in high-ambient environments; -40°C to +125°C rating matches system specs. |
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 Systems) | 36V input, 600mA, fixed 2MHz frequency, no PFM mode, smaller 8-pin SOIC package | Lacks light-load efficiency optimization; better suited for noise-immune, fixed-frequency designs where size > efficiency | Choose when board space is extremely limited and constant-frequency operation is mandatory for EMI compliance. |
| TPS562211 (Texas Instruments) | 17V input, 2A, 650kHz fixed frequency, integrated compensation, no SYNC pin | Lower VIN range limits use to 12V systems; higher current capability but larger solution size and higher IQ (120µA) | Choose when higher output current is required and input voltage never exceeds 17V - e.g., server management cards. |
Compared with MP2451DT-LF-Z and TPS562211, the ISL85415FRZ uniquely balances ultra-wide 3V–36V input, 500mA capability, PFM/PWM flexibility, and minimal external component count in a thermally optimized 4×3mm DFN - making it optimal for industrial and battery-powered designs requiring both ruggedness and efficiency.
Availability
ISL85415FRZ 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 ISL85415FRZ 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 specializing in microcontrollers, analog power management, and timing solutions for industrial, automotive, and infrastructure markets.
The ISL85415FRZ belongs to Renesas' ISL85xx family of wide-input synchronous buck regulators, designed specifically for high-reliability, low-BOM-count DC-DC conversion in harsh environments and battery-operated systems.
FAQ
What is the maximum output current capability of the ISL85415FRZ?
The ISL85415FRZ delivers up to 500mA continuous output current under recommended operating conditions (TA ≤ +125°C, proper thermal layout). Its peak current limit is set at 0.9A, allowing brief transient surges while maintaining stability. Derating is required above +85°C ambient due to thermal constraints of the 4mm × 3mm DFN package.
Does the ISL85415FRZ support external frequency synchronization?
Yes, the ISL85415FRZ supports external synchronization via the SYNC pin. When driven with a clean CMOS clock signal exceeding the programmed switching frequency (e.g., 600kHz for a 500kHz configuration), the device locks to the external source on the rising edge. This enables deterministic timing across multiple ISL85415FRZ regulators in distributed power systems.
How is output voltage set on the ISL85415FRZ?
The ISL85415FRZ uses a precision 0.600V internal reference connected to the FB pin. Output voltage is set by an external resistor divider: VOUT = 0.6V × (1 + R2/R1), where R1 connects FB to GND and R2 connects VOUT to FB. Standard values (e.g., R2 = 90.9kΩ, R1 = 4.75kΩ) yield 5V; layout must minimize trace impedance to FB for accuracy.
Can the ISL85415FRZ operate with only ceramic output capacitors?
Yes, the ISL85415FRZ is fully compatible with ceramic output capacitors. Its internal compensation supports low-ESR ceramics, and typical designs use 10µF–22µF X5R/X7R MLCCs. External compensation (via COMP pin RC network) further enhances stability margin when using high-capacitance, low-ESR ceramic arrays common in compact designs.
What thermal performance can be expected from the ISL85415FRZ in a standard 4-layer PCB?
In a standard 4-layer PCB with 1oz copper, 5+ thermal vias under the EPAD, and 1in² of 2oz inner-layer copper pour connected to PGND, the ISL85415FRZ achieves θJA ≈ 44°C/W. At 500mA and 24VIN/3.3VOUT, power dissipation is ~1.2W, resulting in ~53°C junction rise above ambient - well within the +125°C max rating.
ISL85415FRZ 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):
- 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 FAQ
1.How can I place an order for ISL85415FRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85415FRZ 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 reliable?
The price and inventory of ISL85415FRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85415FRZ is usually 5 days.
3.What payment methods are accepted for ISL85415FRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85415FRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85415FRZ?
ISL85415FRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85415FRZ 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?
For technical support, including ISL85415FRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85415FRZ requirements.
6.How does Aetrix verify that ISL85415FRZ is sourced from the original manufacturer or authorized distributors?
All ISL85415FRZ 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 meets industry standards.
7.What is the process for return or replacement of ISL85415FRZ?
All ISL85415FRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL85415FRZ, 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 part is unused and in its original packaging.
Return procedure for ISL85415FRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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