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Renesas ISL85415FRZ-TKR5194
- Part No.:
- ISL85415FRZ-TKR5194
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85415FRZ-TKR5194.pdf
- Description:
- IC REG BUCK ADJ 500MA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,723
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Product details
Overview
ISL85415FRZ-TKR5194 from Renesas Electronics is a wide-input synchronous buck regulator integrating high-side and low-side NMOS FETs, delivering up to 500mA continuous output current across a 3V–36V input range. It operates at a default 500kHz switching frequency (adjustable 300kHz–2MHz), supports selectable PFM or forced PWM light-load operation, and features internal/external compensation for minimal external components. It is used in industrial control power rails requiring robust 125°C operation.
For engineers reviewing the ISL85415FRZ-TKR5194 datasheet, ISL85415FRZ-TKR5194 pinout, ISL85415FRZ-TKR5194 application, or ISL85415FRZ-TKR5194 equivalent, key selection criteria include its integrated power stage, -40°C to +125°C operating range, 0.6V feedback reference, power-good signaling, and DFN-12 4mm×3mm package with exposed thermal pad.
Technical Context
The ISL85415FRZ-TKR5194 implements peak-current-mode control with an internal 0.6V reference and transconductance error amplifier (230µA/V typical with external compensation). Its dual NMOS power stage features 600mΩ high-side and 330mΩ low-side RDS(on) at VCC = 5V, enabling high efficiency across wide VIN and load ranges.
It integrates a 5V bias LDO, programmable soft-start via SS pin capacitor, synchronization capability on SYNC pin (300kHz–2MHz), and comprehensive protection including overcurrent (0.9A peak), negative current limit (-0.4A), thermal shutdown (150°C), and boot undervoltage lockout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports direct connection to 24V industrial buses, 12V automotive systems, and multi-cell Li-ion batteries without pre-regulation. |
| Output Current | 500mA continuous - sufficient for powering microcontrollers, sensors, and communication ICs in compact embedded systems. |
| Switching Frequency | Default 500kHz; adjustable 300kHz–2MHz via FS pin resistor - enables optimization of size (higher fSW) vs. efficiency (lower fSW) in layout-constrained designs. |
| Feedback Reference | 0.600V ±6mV - allows precise output voltage setting (e.g., 3.3V with 90.9kΩ/12.4kΩ divider) and tight regulation (<±1.5% line/load variation). |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, factory automation, and outdoor industrial equipment environments. |
| Package | 12-lead DFN 4mm × 3mm with exposed thermal pad - provides low thermal resistance (θJA = 44°C/W) and space-efficient PCB integration. |
| Protection Features | Overcurrent (0.9A), negative current limit (-0.4A), thermal shutdown (150°C), and power-good monitoring - ensures reliable operation during fault conditions without external circuitry. |
Pinout & Package
The ISL85415FRZ-TKR5194 is housed in a RoHS-compliant, Pb-free 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 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 & clock sync input | Logic level selects PFM/PWM; external clock input synchronizes switching - eliminates beat frequencies in multi-rail systems. |
| BOOT | Bootstrap supply for high-side gate driver | 100nF capacitor to PHASE supplies gate drive voltage - enables efficient NMOS high-side switching without external charge pump. |
| VIN | Main input supply | Accepts 3V–36V; requires ≥4.7µF ceramic decoupling close to pin - powers both power stage and internal 5V LDO. |
| PHASE | Switch node | Connects to external inductor; carries high dv/dt switching waveform - requires short, low-inductance routing to minimize EMI. |
| PGND | Power ground return | Low-impedance path for inductor and MOSFET currents - must connect directly to PCB ground plane, separate from signal GND where possible. |
| EN | Enable control | Active-high logic input; >1V enables regulator - supports sequencing and standby control; not compatible with VCC connection. |
| PG | Open-drain power-good indicator | Pulled low during soft-start or out-of-regulation - enables system-level power sequencing and fault detection with external pull-up. |
| VCC | Internal 5V LDO output | Supplies bias for control circuitry; requires 1µF ceramic decoupling to PGND - cannot be loaded externally beyond specified leakage. |
| FB | Feedback input | Inverting input of error amplifier; monitors output via resistor divider - sets regulated output voltage (VOUT = 0.6V × (1 + R2/R1)). |
| COMP | Error amplifier output | Connect to VCC for internal compensation; RC network to GND enables external loop tuning - simplifies stability design across wide operating conditions. |
| FS | Frequency selection | Tie to VCC for 500kHz; resistor to GND sets 300kHz–2MHz - allows optimization for efficiency, size, or EMI compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck architecture | Integrated high-side (600mΩ) and low-side (330mΩ) NMOS FETs eliminate external diode losses, enabling >90% efficiency at mid-load across wide VIN. |
| Selectable light-load mode | PFM mode improves light-load efficiency (e.g., 85% at 10mA); forced PWM maintains fixed frequency for predictable EMI - selected via SYNC pin logic level. |
| Flexible compensation | Internal compensation requires zero external components; external RC network on COMP pin enables custom loop response for dynamic load requirements. |
| Robust protection suite | Auto-restart overcurrent, negative current limit, thermal shutdown, and boot UVLO prevent damage during faults - no external protection circuitry needed. |
| Power-good and enable functions | Open-drain PG output signals valid regulation; EN pin supports controlled start-up and system-level power sequencing - simplifies multi-rail system design. |
Applications
| Industrial Control Power Supply | Medical Sensor Module |
|---|---|
Use Scenario: Providing stable 3.3V or 5V rail for PLC I/O modules operating from 24V DC field bus in harsh factory environments. IC Role / Device Role / Timing Role: Primary DC-DC step-down regulator with integrated power switches and thermal protection. Use Value: Eliminates need for external MOSFETs and reduces BOM count by 4–6 components while maintaining 125°C operation and <±1.5% output regulation. | Use Scenario: Powering low-noise analog front-ends and wireless transceivers in portable patient monitors with battery and USB inputs. IC Role / Device Role / Timing Role: Efficient, low-quiescent-current buck converter supporting dual input sources and light-load PFM mode. Use Value: Achieves >85% efficiency at 20mA load (extending battery life) and maintains tight output accuracy (±0.6%) across temperature for sensor signal integrity. |
| Distributed Cloud Infrastructure PSU | Portable Instrumentation Power |
Use Scenario: Generating 1.8V core voltage for FPGA or ASIC in edge-server management cards powered from 12V intermediate bus. IC Role / Device Role / Timing Role: Compact, high-efficiency point-of-load regulator with synchronization capability. Use Value: Synchronization via SYNC pin eliminates beat frequencies in dense multi-rail boards; 4mm×3mm DFN saves >30% board area versus SOIC alternatives. | Use Scenario: Supplying 5V and 3.3V rails for handheld test equipment with variable input (6–30V) from AC adapters or batteries. IC Role / Device Role / Timing Role: Wide-VIN buck regulator with programmable soft-start and power-good signaling. Use Value: Internal soft-start prevents inrush into large capacitive loads; PG output enables safe processor reset sequencing during brown-out events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36520RNXR | 65V max input, 2A output, 1.5mm height - higher voltage/current rating but larger footprint (3mm×3mm) and no SYNC pin. | Better suited for 48V telecom or PoE-powered devices; lacks synchronization for noise-sensitive multi-rail systems. | Select when input exceeds 36V or output current >500mA is required; avoid if board space or EMI-controlled sync is critical. |
| TPS54202DRCT | 6V–17V input, 2A output, integrated compensation - narrower VIN range, no PFM mode, and 3.5mm×3.5mm QFN package. | Optimized for 12V intermediate bus systems; lacks wide-VIN flexibility and light-load efficiency optimization. | Choose for cost-sensitive 12V-only applications where 500mA+ output and -40°C to +125°C operation are not required. |
Compared with LMR36520RNXR and TPS54202DRCT, the ISL85415FRZ-TKR5194 uniquely balances wide 3V–36V input, 500mA output, 125°C operation, PFM/PWM selectability, and synchronization - making it optimal for space-constrained industrial and portable designs needing robustness and EMI control.
Availability
ISL85415FRZ-TKR5194 is available at Aetrix Electronics and suitable for industrial control, medical sensor modules, and portable instrumentation requiring stable component supply, extended temperature support, and long-term production continuity.
Supply support for ISL85415FRZ-TKR5194 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 ISL85415FRZ-TKR5194 belongs to Renesas' ISL85xx family of integrated synchronous buck regulators, designed specifically for space-constrained, wide-input industrial and portable power systems requiring high reliability and minimal external components.
FAQ
What is the maximum input voltage rating for the ISL85415FRZ-TKR5194?
The ISL85415FRZ-TKR5194 has an absolute maximum input voltage rating of +42V, with recommended operation from 3V to 36V. Exceeding 36V continuously may trigger overvoltage protection or reduce reliability; operation above 36V is not supported per datasheet specifications. The device's robust 36V rating makes it suitable for 24V industrial buses with transient spikes.
Does the ISL85415FRZ-TKR5194 support external synchronization of its switching frequency?
Yes, the ISL85415FRZ-TKR5194 supports external synchronization via the SYNC pin. When driven with a clean clock signal (300kHz–2MHz, positive-edge triggered), the device locks its switching frequency to the external source. This feature eliminates beat frequencies in multi-rail systems and aids EMI compliance - a capability not present in many competing 500mA buck regulators.
How does the ISL85415FRZ-TKR5194 handle light-load efficiency optimization?
The ISL85415FRZ-TKR5194 offers selectable light-load operation: connecting SYNC to GND enables PFM mode (improving efficiency below ~100mA), while tying SYNC to VCC forces continuous PWM. This dual-mode capability delivers >85% efficiency at 20mA load in PFM mode - significantly better than forced-PWM-only alternatives - without sacrificing regulation accuracy or transient response.
What thermal performance can be expected from the ISL85415FRZ-TKR5194 in a standard 2-layer PCB layout?
In a standard 2-layer PCB with the EPAD soldered to a 1-in² copper pour and ≥5 thermal vias, the ISL85415FRZ-TKR5194 achieves θJA ≈ 44°C/W. At 500mA output and 24V input, junction temperature rise is typically <40°C above ambient - well within the 125°C max rating. For higher ambient or power density, adding internal ground planes further reduces thermal resistance.
Can the ISL85415FRZ-TKR5194 be used with only internal compensation, and what are the trade-offs?
Yes, the ISL85415FRZ-TKR5194 supports fully internal compensation: tie the COMP pin to VCC and omit external RC components. This configuration delivers stable operation across all recommended conditions with zero external parts - ideal for rapid prototyping and cost-sensitive designs. Trade-offs include less flexibility for optimizing transient response or compensating non-standard output capacitors compared to external compensation.
ISL85415FRZ-TKR5194 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Bulk
- 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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 36V
- Current - Output:
- 500mA
- Frequency - Switching:
- 500kHz, 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
ISL85415FRZ-TKR5194 FAQ
1.How can I place an order for ISL85415FRZ-TKR5194 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85415FRZ-TKR5194 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-TKR5194 reliable?
The price and inventory of ISL85415FRZ-TKR5194 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85415FRZ-TKR5194 is usually 5 days.
3.What payment methods are accepted for ISL85415FRZ-TKR5194?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85415FRZ-TKR5194 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85415FRZ-TKR5194?
ISL85415FRZ-TKR5194 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85415FRZ-TKR5194 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-TKR5194?
For technical support, including ISL85415FRZ-TKR5194 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85415FRZ-TKR5194 requirements.
6.How does Aetrix verify that ISL85415FRZ-TKR5194 is sourced from the original manufacturer or authorized distributors?
All ISL85415FRZ-TKR5194 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-TKR5194 meets industry standards.
7.What is the process for return or replacement of ISL85415FRZ-TKR5194?
All ISL85415FRZ-TKR5194 units undergo pre-shipment inspection (PSI). If there is an issue with ISL85415FRZ-TKR5194, 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-TKR5194 part is unused and in its original packaging.
Return procedure for ISL85415FRZ-TKR5194:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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