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Renesas ISL85412FRTZ-T7A
- Part No.:
- ISL85412FRTZ-T7A
- Manufacturer:
- Renesas
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
ISL85412FRTZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 150MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,437
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Product details
Overview
ISL85412FRTZ-T7A from Renesas (formerly Intersil) is a wide-input synchronous buck regulator delivering up to 150mA output current with 3.5V–40V input range, integrated high-side/low-side NMOS FETs, and 700kHz fixed switching frequency. It operates in selectable PFM or forced PWM mode and features internal soft-start, power-good flag, and -40°C to +125°C junction temperature rating-used in industrial control power rails and portable instrumentation.
For engineers reviewing the ISL85412FRTZ-T7A datasheet, ISL85412FRTZ-T7A pinout, ISL85412FRTZ-T7A application, or ISL85412FRTZ-T7A equivalent, key selection criteria include its 700kHz switching frequency, 0.6V feedback reference, integrated 900mΩ/500mΩ MOSFETs, PFM/PWM mode selectability, and TDFN-8 3mm×3mm package with exposed thermal pad.
Technical Context
The ISL85412FRTZ-T7A implements peak current-mode PWM control with 450mV/T slope compensation and 930mV/A current sense transresistance, enabling stable regulation across wide VIN and load ranges. Its error amplifier uses a 600mV internal reference and 50µA/V transconductance, paired with internal 150kΩ/54pF compensation network for no-external-compensation operation.
Light-load efficiency is enhanced via automatic PFM entry when eight consecutive zero-current crossings are detected-triggering pulse-frequency modulation with comparator-based output regulation. Overcurrent protection activates at 0.4A peak limit (PWM) or 0.22A (PFM), with thermal shutdown at 150°C and hysteresis of 20°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 40V - supports direct connection to 24V industrial buses or 36V battery systems without pre-regulation. |
| Output Current | 150mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained designs. |
| Switching Frequency | 700kHz nominal - enables compact external inductor (e.g., 10–47µH) and low-profile ceramic output capacitors. |
| Feedback Reference | 0.599V typical - sets output voltage via resistor divider; tight 0.589V–0.606V tolerance ensures ±1.2% output accuracy over temperature. |
| MOSFET RDS(on) | High-side: 1300mΩ max, Low-side: 800mΩ max - defines conduction loss and thermal rise at full load. |
| Soft-Start Time | 2.3ms typical - prevents inrush current into downstream capacitance during power-up. |
| Power-Good Threshold | 94%–121% of VFB - provides reliable output monitoring with hysteresis to avoid false toggling near regulation limits. |
Pinout & Package
The ISL85412FRTZ-T7A is housed in an RoHS-compliant 8-lead 3mm×3mm TDFN package with exposed thermal pad (EPAD) requiring ≥5 vias to GND plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE | Mode selection input | Logic-high = forced PWM; logic-low = PFM; floating = auto-select - determines light-load efficiency strategy. |
| BOOT | Bootstrap supply | Connects 100nF capacitor to PHASE to gate-drive high-side NMOS; critical for proper high-side FET turn-on. |
| VIN | Main input supply | Accepts 3.5V–40V; requires ≥10µF ceramic decoupling close to pin to suppress switching noise. |
| PHASE | Switch node | Drives external inductor; connects internal high/low-side FETs; must be routed with minimal loop area. |
| EN | Enable control | Active-high enable; >1.45V threshold starts regulation; tied to VIN for automatic startup. |
| PG | Open-drain power-good | Pulled low during soft-start or out-of-regulation; internal 5MΩ pull-up enables direct MCU GPIO monitoring. |
| VCC | Bias LDO output | 5V ±0.5V regulated supply for internal circuitry; decoupled with 1µF ceramic to PGND. |
| FB | Feedback input | Inverting input of error amplifier; connected to resistor divider to set VOUT; also used by PG and UVLO circuits. |
| GND / EPAD | Signal and thermal ground | Common reference for all voltages; EPAD must be soldered and connected to PCB GND plane with ≥5 vias. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Internal 150kΩ/54pF RC network eliminates need for external loop compensation components. |
| Selectable PFM/PWM operation | MODE pin configures light-load behavior: PFM improves efficiency below ~20mA; PWM ensures fixed frequency for EMI control. |
| Integrated power MOSFETs | Eliminates external high/low-side switches, reducing BOM count and layout complexity while ensuring matched timing. |
| Robust protection suite | Includes overcurrent (0.4A peak), overtemperature (150°C shutdown), boot undervoltage, and negative current limiting (-0.3A). |
| Power-good and enable functions | PG provides system-level power sequencing feedback; EN allows controlled startup/shutdown independent of VIN rail. |
Applications
| Industrial Control Power Supply | Portable Medical Instrumentation |
|---|---|
Use Scenario: Providing isolated 3.3V or 5V bias for PLC I/O modules operating from 24V DC field bus. IC Role / Device Role / Timing Role: Primary DC-DC converter regulating auxiliary rail with high input voltage tolerance and thermal robustness. Use Value: Wide 3.5V–40V input accommodates bus voltage fluctuations; 125°C operation ensures reliability in enclosed cabinets. | Use Scenario: Generating 1.8V/3.3V for low-power ADCs and wireless transceivers in handheld diagnostic devices. IC Role / Device Role / Timing Role: Efficient point-of-load regulator powered from single-cell Li-ion (3.0–4.2V) or two-cell packs (6–8.4V). Use Value: PFM mode extends battery life at standby; small 3mm×3mm TDFN footprint saves board space in compact enclosures. |
| Distributed Sensor Node Supply | Cloud Infrastructure Management ASIC Bias |
Use Scenario: Powering MEMS sensors and signal-conditioning circuitry in remote environmental monitoring nodes. IC Role / Device Role / Timing Role: Local regulator converting 12V backplane supply to 2.5V/3.3V sensor interface rail. Use Value: Integrated MOSFETs and no-compensation design reduce component count and qualification effort for long-lifecycle deployments. | Use Scenario: Delivering stable 1.2V or 1.5V to FPGA configuration logic or baseboard management controllers (BMC) in server racks. IC Role / Device Role / Timing Role: Secondary regulator fed from intermediate 5V or 12V distribution rail. Use Value: 700kHz switching enables use of miniature shielded inductors; PG signal integrates with BMC health monitoring firmware. |
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, 2MHz switching, no PFM mode, different pinout | Higher current, higher frequency, less suitable for ultra-low-quiescent or thermally constrained designs | Choose MP2451DT-LF-Z only if >150mA output or faster transient response is required; not pin-compatible. |
| TPS562201DDFR | 4.5V–17V input, 2A output, 500kHz, integrated compensation, PFM/PWM selectable | Narrower input range excludes 24V/36V industrial use; higher current capability increases cost and size | TPS562201DDFR fits lower-voltage embedded applications but cannot replace ISL85412FRTZ-T7A in 40V-rated systems. |
Compared with MP2451DT-LF-Z and TPS562201DDFR, the ISL85412FRTZ-T7A uniquely balances ultra-wide input range (up to 40V), compact 3mm×3mm packaging, and integrated PFM/PWM flexibility-making it optimal for space- and voltage-critical industrial and portable designs where 150mA suffices.
Availability
ISL85412FRTZ-T7A is available at Aetrix Electronics and suitable for industrial control, portable medical instrumentation, distributed sensor node supply, and cloud infrastructure management ASIC bias requiring stable component supply across extended temperature and voltage ranges.
Supply support for ISL85412FRTZ-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 Corporation, formed from the merger of Renesas Technology and NEC Electronics, is a global semiconductor leader specializing in microcontrollers, analog, power management, and connectivity solutions.
The ISL85412FRTZ-T7A belongs to Renesas' wide-input synchronous buck regulator product line, designed specifically for industrial, medical, and portable equipment requiring high-voltage resilience, minimal external components, and robust thermal performance.
FAQ
What is the maximum input voltage rating for the ISL85412FRTZ-T7A?
The ISL85412FRTZ-T7A has an absolute maximum input voltage rating of +43V, with recommended continuous operation from 3.5V to 40V. Exceeding 40V may trigger overvoltage protection or degrade long-term reliability; operation above 43V risks permanent damage per Absolute Maximum Ratings on page 5 of FN8378 Rev 1.00.
Does the ISL85412FRTZ-T7A require external compensation components?
No, the ISL85412FRTZ-T7A does not require external compensation components. It integrates a 150kΩ resistor and 54pF capacitor for internal loop compensation, enabling stable operation across its full input and load range without additional external parts-confirmed in the "Features" section and "Detailed Description" on page 15 of FN8378 Rev 1.00.
How does the MODE pin affect light-load efficiency in the ISL85412FRTZ-T7A?
The MODE pin configures light-load operation: grounding it enables automatic PFM mode, improving efficiency below ~20mA by reducing switching frequency; connecting it to VCC forces fixed-frequency PWM. Floating MODE uses an internal 5MΩ pull-down for auto-selection-detailed in Pin Descriptions (page 3) and Light Load Operation (page 15) of FN8378 Rev 1.00.
What is the purpose of the PG (Power-Good) pin on the ISL85412FRTZ-T7A?
The PG pin is an open-drain output that signals valid regulation: it remains low during soft-start, when FB voltage is outside 94%–121% of 0.6V, or during overtemperature fault, and goes high-impedance otherwise. An internal 5MΩ pull-up allows direct connection to MCU GPIO-described in Pin Descriptions (page 3) and Power-Good section (page 15) of FN8378 Rev 1.00.
Can the ISL85412FRTZ-T7A drive a 150mA load continuously at 40V input?
Yes, the ISL85412FRTZ-T7A supports 150mA continuous output current across its full 3.5V–40V input range, verified by Electrical Specifications (page 5) and Typical Performance Curves (e.g., Figure 17 shows 5V output regulation at 150mA with 36V input). Thermal design must ensure junction temperature stays ≤125°C using the TDFN package's θJA = 47°C/W.
ISL85412FRTZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-WFDFN 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):
- 3.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 150mA
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (3x3)
ISL85412FRTZ-T7A FAQ
1.How can I place an order for ISL85412FRTZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85412FRTZ-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 ISL85412FRTZ-T7A reliable?
The price and inventory of ISL85412FRTZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85412FRTZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL85412FRTZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85412FRTZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85412FRTZ-T7A?
ISL85412FRTZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85412FRTZ-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 ISL85412FRTZ-T7A?
For technical support, including ISL85412FRTZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85412FRTZ-T7A requirements.
6.How does Aetrix verify that ISL85412FRTZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL85412FRTZ-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 ISL85412FRTZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL85412FRTZ-T7A?
All ISL85412FRTZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL85412FRTZ-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 ISL85412FRTZ-T7A part is unused and in its original packaging.
Return procedure for ISL85412FRTZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL85412FRTZ-T7A Tags
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