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Renesas ISL85412FRTZ-T
- Part No.:
- ISL85412FRTZ-T
- Manufacturer:
- Renesas
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
ISL85412FRTZ-T.pdf
- Description:
- IC REG BUCK ADJ 150MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,137
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Product details
Overview
ISL85412FRTZ-T from Renesas (formerly Intersil) is a wide-input synchronous buck regulator integrating high-side and low-side NMOS FETs, delivering up to 150mA continuous output current across a 3.5V–40V input range. It operates at a fixed 700kHz switching frequency with selectable PFM or forced PWM mode, internal soft-start, power-good signaling, and operates from –40°C to +125°C junction temperature-ideal for industrial power rails in distributed systems.
For engineers reviewing the ISL85412FRTZ-T datasheet, ISL85412FRTZ-T pinout, ISL85412FRTZ-T application, or ISL85412FRTZ-T equivalent, key selection criteria include its integrated dual-FET architecture, no-external-compensation design, 700kHz fixed-frequency operation, PFM/PWM mode flexibility, and robust thermal protection for high-voltage industrial and battery-powered embedded systems.
Technical Context
The ISL85412FRTZ-T implements peak current-mode control with internal slope compensation (450mV/T), 930mV/A current sense transresistance, and a 600mV reference voltage for feedback regulation. Its error amplifier features 50µA/V transconductance and internal RC compensation (150kΩ/54pF).
It supports automatic light-load PFM entry after eight consecutive zero-current detection cycles, with distinct peak current limits: 0.4A in PWM mode and 0.22A typical in PFM mode. Overcurrent protection includes blanking time (17 clock pulses) and auto-restart timing (8 soft-start cycles).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 40V - supports direct connection to 12V/24V industrial buses and 36V battery stacks 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 magnetics (e.g., 10–47µH inductors) and reduces output ripple without requiring large bulk capacitance. |
| Feedback Reference | 0.599V ±10mV - precise internal reference allows accurate output setting via standard resistor dividers (e.g., 1.0V to 12V). |
| Power-Good Threshold | ±6% window around VREF - ensures reliable system enablement only when output is within regulation before downstream logic powers up. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design while enabling safe recovery. |
| Quiescent Current | 50µA in active PFM mode - extends battery life in always-on sensor nodes and portable instrumentation. |
Pinout & Package
The ISL85412FRTZ-T is housed in an 8-lead 3mm × 3mm TDFN package with exposed thermal pad (EPAD), optimized for high-power-density layouts and thermal performance in industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE | Mode selection input | Logic-level control for PFM (grounded) or forced PWM (tied to VCC); internal 5MΩ pull-down prevents floating state. |
| BOOT | Bootstrap supply | Drives high-side NMOS gate; requires external 100nF capacitor to PHASE for proper gate drive voltage generation. |
| VIN | Main power input | Supplies both power stage and internal LDO; requires ≥10µF ceramic decoupling close to pin for stability. |
| PHASE | Switch node | Connects internal FETs to external inductor; high di/dt node requiring short, low-inductance routing to minimize EMI. |
| EN | Enable input | Active-high enable with 1.45V rising threshold; tied to VIN for automatic startup; must not connect to VCC. |
| PG | Open-drain power-good | Signals regulation status; pulled low during soft-start or fault; internal 5MΩ pull-up enables direct MCU GPIO monitoring. |
| VCC | Bias LDO output | 5V ±0.5V regulated supply for internal circuitry; requires 1µF ceramic decoupling to PGND at pin. |
| FB | Feedback input | Inverting input of error amplifier; monitors output via resistor divider; also used by PG and UVLO circuits. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Integrated 150kΩ/54pF RC network eliminates need for loop compensation components, reducing BOM count and layout sensitivity. |
| Synchronous buck architecture | Integrated high-side (1.3Ω max) and low-side (0.8Ω max) NMOS FETs eliminate external diode losses, enabling >90% efficiency at mid-load. |
| Selectable light-load operation | PFM mode improves light-load efficiency (e.g., 85% at 1mA, VIN=12V, VOUT=3.3V); forced PWM ensures constant frequency for EMI-sensitive applications. |
| Robust protection suite | Includes overcurrent (0.4A PWM limit), overtemperature (150°C shutdown), boot undervoltage, and negative current limiting (–0.3A) for bidirectional inductor current control. |
| Industrial-grade thermal rating | –40°C to +125°C operating junction temperature enables deployment in motor drives, PLCs, and outdoor infrastructure without derating. |
Applications
| Industrial Control | Medical Devices |
|---|---|
Use Scenario: Powering isolated I/O modules and fieldbus interface ICs in programmable logic controllers under 24V DC bus conditions. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator converting unregulated 24V rail with high input transient tolerance. Use Value: Wide 3.5V–40V input range accommodates brownouts and surges common in factory-floor wiring without external protection. | Use Scenario: Supplying low-noise analog front-end circuitry and microcontroller peripherals in portable ultrasound and patient monitors. IC Role / Device Role / Timing Role: Efficient, low-quiescent-current DC-DC converter for battery-backed subsystems requiring stable 1.8V/3.3V rails. Use Value: 50µA quiescent current in PFM mode extends runtime in standby; soft-start prevents inrush into sensitive analog stages. |
| Portable Instrumentation | Distributed Power Supplies |
Use Scenario: Regulating power for handheld multimeters, gas detectors, and environmental sensors operating from single-cell Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: Input-flexible buck converter supporting variable battery voltages (3.5V–40V) while maintaining tight output regulation. Use Value: Automatic PFM-to-PWM transition ensures high efficiency across full load range-from µA sleep currents to 150mA active measurement bursts. | Use Scenario: Providing auxiliary 5V/12V rails in telecom edge routers and cloud server management cards where space and reliability are critical. IC Role / Device Role / Timing Role: Compact, integrated PoL regulator replacing discrete buck controllers + MOSFETs in multi-rail power architectures. Use Value: Minimal external parts (only inductor, two capacitors, two resistors) reduce footprint and assembly cost versus controller-based solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63001DRCR | Lower input range (1.8V–5.5V), higher output current (600mA), buck-boost topology | Designed for single-cell battery systems needing regulated output despite voltage sag below 3.5V | Not suitable for 12V/24V industrial inputs; use only where input falls below 3.5V or boost capability is required. |
| LMR14010ADRCR | Higher current (1A), wider input (4.5V–40V), external MOSFETs, requires compensation | Targeted at higher-power industrial loads where 150mA is insufficient | Requires additional FETs, gate drivers, and compensation network-increases BOM and layout complexity versus ISL85412FRTZ-T's integrated solution. |
Compared with TPS63001DRCR and LMR14010ADRCR, the ISL85412FRTZ-T offers optimal integration and minimal external component count for sub-200mA loads in high-input-voltage systems, trading peak current capability for simplicity, size, and ease of qualification in industrial and medical designs.
Availability
ISL85412FRTZ-T is available at Aetrix Electronics and suitable for industrial control, medical devices, portable instrumentation, and distributed power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL85412FRTZ-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 acquired Intersil in 2017 and continues to develop and support its high-performance analog and power management portfolio.
The ISL85412FRTZ-T belongs to Renesas' wide-input synchronous buck regulator family, designed specifically for rugged, space-constrained industrial and medical applications demanding high reliability across extended temperature and input voltage ranges.
FAQ
What is the maximum continuous output current of the ISL85412FRTZ-T?
The ISL85412FRTZ-T delivers up to 150mA continuous output current under recommended operating conditions (TJ ≤ +125°C, adequate PCB copper area). This rating assumes proper thermal management using the exposed pad and ≥5 vias to ground plane. Peak current capability reaches 0.4A in PWM mode, but sustained operation above 150mA may trigger thermal shutdown depending on ambient conditions and layout.
Does the ISL85412FRTZ-T require external compensation components?
No, the ISL85412FRTZ-T does not require external compensation components. It integrates internal compensation with a fixed 150kΩ resistor and 54pF capacitor network connected to the error amplifier output. This eliminates the need for external type-II or type-III compensation networks, simplifying design and improving consistency across production units.
How does the MODE pin affect operation of the ISL85412FRTZ-T?
The MODE pin selects between PFM and forced PWM operation: grounding it enables automatic PFM mode at light loads for higher efficiency, tying it to VCC forces continuous PWM for predictable EMI behavior, and leaving it floating (relying on the internal 5MΩ pull-down) defaults to PFM. The pin accepts standard logic levels and has leakage current <100nA, making it compatible with most microcontroller GPIOs.
What is the purpose of the PG (power-good) pin on the ISL85412FRTZ-T?
The PG pin on the ISL85412FRTZ-T is an open-drain output that signals when the output voltage is within regulation (±6% of target). It remains low during soft-start, when EN is inactive, or during faults (overtemperature, overvoltage), and goes high-impedance otherwise. An internal 5MΩ pull-up resistor allows direct connection to a microcontroller GPIO without an external pull-up, enabling system-level power sequencing and fault detection.
Can the ISL85412FRTZ-T operate from a 48V input source?
No, the ISL85412FRTZ-T has an absolute maximum input voltage rating of +43V and a recommended operating range of 3.5V to 40V. Applying 48V exceeds both specifications and risks permanent damage. For 48V systems, consider regulators rated for ≥60V input such as the LM5164 or MAX20006, or add an upstream pre-regulator stage to step down to ≤40V before the ISL85412FRTZ-T.
ISL85412FRTZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-WFDFN 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):
- 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-T FAQ
1.How can I place an order for ISL85412FRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85412FRTZ-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 ISL85412FRTZ-T reliable?
The price and inventory of ISL85412FRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85412FRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL85412FRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85412FRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85412FRTZ-T?
ISL85412FRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85412FRTZ-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 ISL85412FRTZ-T?
For technical support, including ISL85412FRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85412FRTZ-T requirements.
6.How does Aetrix verify that ISL85412FRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL85412FRTZ-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 ISL85412FRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL85412FRTZ-T?
All ISL85412FRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL85412FRTZ-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 ISL85412FRTZ-T part is unused and in its original packaging.
Return procedure for ISL85412FRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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