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Renesas ISL85413FRTZ-T
- Part No.:
- ISL85413FRTZ-T
- Manufacturer:
- Renesas
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
ISL85413FRTZ-T.pdf
- Description:
- IC REG BUCK ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,522
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Product details
Overview
ISL85413FRTZ-T from Renesas (formerly Intersil) is a wide-input synchronous buck regulator IC delivering up to 300mA output current with 3.5V–40V input range, integrated high-side/low-side NMOS FETs, 700kHz switching frequency, and selectable PFM/PWM light-load operation. It serves as a primary DC-DC step-down power stage in industrial control systems requiring robust high-voltage operation.
For engineers reviewing the ISL85413FRTZ-T datasheet, ISL85413FRTZ-T pinout, ISL85413FRTZ-T application, or ISL85413FRTZ-T equivalent, key selection criteria include its -40°C to +125°C junction temperature rating, internal soft-start and power-good functions, minimal external component count, and compatibility with standard 3mm×3mm TDFN layout footprints.
Technical Context
The ISL85413FRTZ-T implements peak current-mode PWM control with internal slope compensation (450mV/T), transconductance error amplifier (50µA/V), and 600mV reference voltage. Its current-sense gain is 0.93V/A, enabling precise overcurrent protection at 0.6A typical peak limit.
It integrates a 5V bias LDO (VCC output), supports automatic PFM-to-PWM transition based on zero-current detection, and features internal soft-start with 2.3ms ramp time. Protection includes thermal shutdown (150°C), overcurrent auto-restart, negative current limiting (-0.3A), and boot undervoltage lockout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 40V - enables direct connection to 24V industrial rails or 36V battery stacks without pre-regulation. |
| Output Current | 300mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs in distributed systems. |
| Switching Frequency | 700kHz nominal - balances efficiency and EMI while allowing compact 10–47µH inductor selection. |
| Feedback Reference | 0.599V ±10mV - sets output voltage via resistor divider; enables 1.0V to 12V regulation with <±1.5% load regulation. |
| Junction Temp Range | -40°C to +125°C - qualified for under-hood automotive ancillary supplies and industrial PLC modules. |
| Quiescent Current | 50µA in active mode - extends battery life in portable instrumentation during standby. |
| Shutdown Current | 2.5µA max - ensures negligible drain in always-on systems with enable-controlled sleep states. |
Pinout & Package
ISL85413FRTZ-T is housed in an 8-lead 3mm×3mm TDFN package with exposed thermal pad (EPAD). The package supports high-power dissipation in compact layouts and requires ≥5 vias to GND plane per datasheet layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MODE | Operation mode select | Logic-level input controlling PFM (GND) or forced PWM (VCC); internal 5MΩ pull-down prevents floating state. |
| 2 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100nF ceramic capacitor to PHASE for proper gate drive voltage generation. |
| 3 VIN | Main power input | Supplies both power stage and internal LDO; requires ≥10µF ceramic decoupling close to pin. |
| 4 PHASE | Switch node | Connects internal FETs to external inductor; carries high di/dt switching current-requires short, low-inductance routing. |
| 5 EN | Enable control | Active-high logic input; >1.45V enables regulator; tied to VIN for automatic startup; not compatible with VCC connection. |
| 6 PG | Power-good indicator | Open-drain output pulled low during soft-start, UVLO, or fault; internal 5MΩ pull-up enables direct MCU monitoring. |
| 7 VCC | Bias LDO output | 5V regulated supply for internal circuitry; requires 1µF ceramic decoupling to PGND. |
| 8 FB | Voltage feedback | Inverting input of error amplifier; monitors output via resistor divider; used by PG and UVLO circuits. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Internal RC network (150kΩ/54pF) eliminates need for loop compensation components-reduces BOM count and design iteration time. |
| Integrated high- and low-side NMOS | Eliminates external MOSFETs and gate drivers-reduces PCB area, parasitic inductance, and thermal management complexity. |
| Selectable PFM/PWM light-load mode | Enables >85% efficiency at 10mA load (VIN=12V, VOUT=3.3V) without sacrificing transient response at full load. |
| Internal soft-start (2.3ms) | Prevents inrush current into output capacitors-avoids input rail sag and avoids overstressing downstream loads during power-up. |
| Power-good and enable functions | PG provides system-level sequencing confirmation; EN allows clean power cycling and deep-sleep entry without external logic. |
Applications
| Industrial Control | Medical Devices |
|---|---|
Use Scenario: Powering PLC I/O modules and fieldbus interface ICs in factory automation cabinets with 24V DC rails. IC Role / Device Role / Timing Role: Primary 3.3V/5V step-down regulator supplying isolated CAN transceivers and analog front-ends. Use Value: Wide 3.5–40V input accommodates brownout and surge conditions common in industrial environments; 125°C rating ensures reliability in enclosed enclosures. | Use Scenario: Providing regulated power to patient-monitoring sensor signal chains and low-power microcontrollers in portable diagnostic equipment. IC Role / Device Role / Timing Role: Single-chip DC-DC converter replacing discrete buck controllers and MOSFETs in battery-powered handheld units. Use Value: 50µA quiescent current extends operating time between charges; PFM mode maintains >87% efficiency at 5mA load for extended standby periods. |
| Portable Instrumentation | Distributed Power Supplies |
Use Scenario: Supplying precision ADCs, op-amps, and wireless SoCs in handheld test meters with Li-ion or alkaline battery inputs. IC Role / Device Role / Timing Role: Input-stage regulator converting variable battery voltage (3.6–36V) to stable 1.8V/3.3V for mixed-signal subsystems. Use Value: 700kHz fixed-frequency operation simplifies EMI filtering; internal soft-start prevents voltage overshoot during cold-start from depleted batteries. | Use Scenario: Local point-of-load regulation in cloud server rack PSUs where 12V or 48V intermediate bus powers auxiliary rails. IC Role / Device Role / Timing Role: Secondary buck converter generating 1.2V for FPGA configuration or 5V for fan controllers in modular power architectures. Use Value: Integrated FETs eliminate gate-drive timing mismatches; thermal shutdown protects against airflow failure in densely packed chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33630ADBRAR | 36V input, 3A output, 2.1MHz switching, requires external compensation | Higher current, higher frequency, larger solution size due to external loop components | Choose when >300mA load or faster transient response is required; not drop-in compatible. |
| TPS563201DDCR | 17V input, 3A output, 500kHz, integrated compensation, smaller 2mm×2mm WSON | Lower VIN range limits use to 12V systems; higher current capability unnecessary for 300mA designs | Consider only for space-constrained 12V applications where 3A headroom is acceptable overhead. |
Compared with LMR33630ADBRAR and TPS563201DDCR, the ISL85413FRTZ-T offers optimal balance of ultra-wide input range, minimal external parts, and industrial-grade thermal performance in a compact 3mm×3mm footprint-making it uniquely suited for high-voltage, low-to-moderate current embedded power rails.
Availability
ISL85413FRTZ-T is available at Aetrix Electronics and suitable for industrial control, medical devices, and portable instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ISL85413FRTZ-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 Corporation acquired Intersil in 2017 and continues to support its high-performance analog and power management portfolio.
The ISL85413FRTZ-T belongs to Renesas' wide-input synchronous buck regulator family, designed specifically for ruggedized power conversion in industrial, medical, and transportation systems where input voltage variability and ambient temperature extremes are critical constraints.
FAQ
What is the maximum input voltage rating for the ISL85413FRTZ-T?
The ISL85413FRTZ-T has an absolute maximum input voltage rating of +43V, with recommended continuous operation limited to +40V. This 3.5V to +40V operating range allows direct connection to 24V and 36V industrial power buses while maintaining margin for line transients and ripple. Operation beyond 40V risks permanent damage per the Absolute Maximum Ratings table on page 5 of the FN8379 datasheet.
Does the ISL85413FRTZ-T require external compensation components?
No, the ISL85413FRTZ-T does not require external compensation components. It incorporates an internal 150kΩ resistor and 54pF capacitor network for loop compensation, eliminating the need for external RC networks. This feature reduces BOM count, PCB area, and design validation effort-confirmed in the "Features" section and "Detailed Description" on page 15 of the FN8379 datasheet.
How does the MODE pin affect light-load efficiency in the ISL85413FRTZ-T?
The MODE pin on the ISL85413FRTZ-T selects between forced PWM and automatic PFM operation. When grounded, the IC enters PFM mode below ~15mA load, reducing switching losses and achieving >85% efficiency at 10mA (VIN=12V, VOUT=3.3V). This behavior is verified in Figures 2–4 and described in the "Light Load Operation" section on page 15 of FN8379.
What is the purpose of the PG (power-good) pin on the ISL85413FRTZ-T?
The PG pin on the ISL85413FRTZ-T is an open-drain output that signals valid output regulation. It remains low during soft-start, when FB voltage is outside the 91–121% window, or during thermal/fault conditions. An internal 5MΩ pull-up enables direct connection to MCU GPIO pins for power sequencing-detailed in the Pin Descriptions (page 3) and Power-Good section (page 15) of FN8379.
Can the ISL85413FRTZ-T be used in automotive applications?
The ISL85413FRTZ-T is rated for -40°C to +125°C junction temperature and supports 40V input, making it suitable for automotive body electronics and infotainment power rails-but it is not AEC-Q100 qualified. For under-hood applications requiring automotive qualification, designers should consult Renesas' AEC-Q100-compliant alternatives such as the ISL78213. The ISL85413FRTZ-T datasheet contains no AEC-Q100 stress test data or automotive-specific reliability reporting.
ISL85413FRTZ-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:
- 300mA
- 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)
ISL85413FRTZ-T FAQ
1.How can I place an order for ISL85413FRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85413FRTZ-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 ISL85413FRTZ-T reliable?
The price and inventory of ISL85413FRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85413FRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL85413FRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85413FRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85413FRTZ-T?
ISL85413FRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85413FRTZ-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 ISL85413FRTZ-T?
For technical support, including ISL85413FRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85413FRTZ-T requirements.
6.How does Aetrix verify that ISL85413FRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL85413FRTZ-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 ISL85413FRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL85413FRTZ-T?
All ISL85413FRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL85413FRTZ-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 ISL85413FRTZ-T part is unused and in its original packaging.
Return procedure for ISL85413FRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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