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Renesas ISL85413FRTZ
- Part No.:
- ISL85413FRTZ
- Manufacturer:
- Renesas
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
ISL85413FRTZ.pdf
- Description:
- IC REG BUCK ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:467
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Product details
Overview
ISL85413FRTZ from Renesas (formerly Intersil) is a wide-input synchronous buck DC/DC regulator integrating high-side and low-side NMOS FETs, delivering up to 300mA continuous output current with input voltage range 3.5V–40V, fixed 700kHz switching frequency, and selectable PFM/PWM light-load operation. It serves as a compact, low-BOM power supply solution in industrial control and portable instrumentation.
For engineers reviewing the ISL85413FRTZ datasheet, ISL85413FRTZ pinout, ISL85413FRTZ application, or ISL85413FRTZ equivalent, key selection considerations include its integrated power stage, -40°C to +125°C junction temperature rating, internal soft-start (2.3ms), power-good output, and 3mm×3mm TDFN package with exposed thermal pad.
Technical Context
The ISL85413FRTZ employs peak current-mode PWM control with internal slope compensation (450mV/T) and transconductance error amplifier (50µA/V) referenced to 600mV. Its current sense gain is 930mV/A, enabling precise cycle-by-cycle overcurrent protection at 0.6A typical peak limit.
It integrates a 5V bias LDO (VCC output), supports external feedback via resistor divider on FB pin, and features zero-current detection for automatic PFM entry when eight consecutive inductor current zero crossings occur - corresponding to ~150mA load threshold under typical conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 40V - enables direct operation from 12V/24V industrial rails or 36V battery stacks without pre-regulation. |
| Output Current | 300mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained designs. |
| Switching Frequency | 700kHz (±12%) - balances efficiency and EMI while allowing use of small 10–47µH inductors and ceramic output capacitors. |
| Feedback Reference | 600mV ±10mV - sets output voltage via external resistor divider; enables 1.0V to 12V programmable outputs with tight regulation. |
| Power-Good Threshold | ±6% window around VOUT (94%/85% rising/falling) - provides reliable system sequencing and fault indication without external comparators. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design while enabling safe auto-recovery. |
| Quiescent Current | 50µA in active PFM mode - extends battery life in always-on monitoring applications. |
Pinout & Package
The ISL85413FRTZ is housed in an 8-lead 3mm×3mm TDFN package with exposed thermal pad (EPAD), rated for -40°C to +125°C junction temperature. The EPAD must be connected to GND plane using ≥5 vias for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MODE | Light-load operation mode select | Logic high = forced PWM; logic low = PFM; floating = auto-select (internal 5MΩ pull-down). |
| 2 BOOT | Bootstrap supply for high-side gate driver | Requires 100nF capacitor to PHASE; enables full enhancement of integrated high-side NMOS. |
| 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; must minimize loop area for EMI control. |
| 5 EN | Enable input | Active-high (1.2V threshold); connects to VIN for automatic start-up; not compatible with VCC connection. |
| 6 PG | Open-drain power-good indicator | Pulled low during soft-start, undervoltage, or overtemperature; includes internal 5MΩ pull-up. |
| 7 VCC | Bias LDO output | 5V ±0.5V regulated supply for internal circuitry; requires 1µF ceramic decoupling to PGND. |
| 8 FB | Feedback input | 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 Type-II compensation (150kΩ/54pF) eliminates need for external RC network, reducing BOM and layout sensitivity. |
| Integrated dual NMOS power stage | High-side RDS(on) = 1.3Ω max, low-side RDS(on) = 0.8Ω max - enables >90% efficiency at 12VIN/3.3VOUT/100mA without discrete MOSFETs. |
| Selectably optimized light-load efficiency | PFM mode reduces quiescent current to 50µA and maintains >80% efficiency down to 1mA load, critical for battery longevity. |
| Robust protection suite | Includes overcurrent (0.6A peak), negative current limit (-0.3A), boot undervoltage lockout, and thermal shutdown with hysteresis. |
| Internal soft-start | 2.3ms monotonic ramp prevents inrush current and output overshoot - eliminates need for external soft-start circuitry. |
Applications
| Industrial Control Sensors | Portable Medical Instrumentation |
|---|---|
Use Scenario: Powering isolated analog front-ends and ADCs in PLC I/O modules operating from 24V DC rails. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator with high PSRR and low noise for precision signal conditioning. Use Value: Wide 3.5–40V input accommodates brownout and surge conditions; integrated FETs eliminate layout-critical gate drive routing. |
Use Scenario: Supplying low-power microcontroller, display, and sensor subsystems in handheld blood glucose meters. IC Role / Device Role / Timing Role: Main system regulator converting single-cell Li-ion (4.2V) or two-cell alkaline (3.2V) to stable 1.8V/3.3V. Use Value: 50µA PFM quiescent current extends battery life; 2.3ms soft-start prevents false wake-up during cold start. |
| Distributed Cloud Infrastructure | High-Voltage Industrial Monitoring |
Use Scenario: Providing auxiliary 1.2V/1.8V rails for FPGA configuration and communication interfaces in edge server management controllers. IC Role / Device Role / Timing Role: Secondary buck regulator fed from intermediate 5V/12V bus, supporting dynamic voltage scaling. Use Value: 700kHz switching allows compact 10µH inductors; power-good signal enables safe FPGA configuration sequencing. |
Use Scenario: Powering isolation amplifiers and CAN transceivers in motor drive gate driver boards supplied from 36V DC bus. IC Role / Device Role / Timing Role: Robust 5V rail generator tolerant of line transients and extended temperature operation. Use Value: 40V absolute max input and 125°C junction rating ensure reliability in harsh environments; thermal shutdown prevents latch-up during overload. |
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 | 36V max input, 0.6A output, fixed 550kHz fSW, no PFM mode, requires external compensation. | Higher output current but lacks auto PFM; less suitable for ultra-low-power battery systems. | Choose for higher load capability where fixed-frequency PWM-only operation is acceptable and board space allows compensation components. |
| TPS563201DDFR | 17V max input, 3A output, 500kHz fSW, integrated compensation, PFM/PWM auto mode. | Lower input voltage ceiling; unsuitable for 24V/36V industrial rails but better for USB-powered or low-vin embedded systems. | Choose when input is ≤17V and >500mA load current is required; not a drop-in replacement due to different voltage and thermal specs. |
Compared with MP2451DT-LF-Z and TPS563201DDFR, the ISL85413FRTZ uniquely combines 40V input tolerance, integrated power stage, PFM/PWM flexibility, and minimal external component count in a 3mm×3mm footprint - making it optimal for space- and input-voltage-constrained industrial and portable designs.
Availability
ISL85413FRTZ is available at Aetrix Electronics and suitable for industrial control sensors, portable medical instrumentation, and distributed cloud infrastructure requiring stable component supply across extended temperature and voltage ranges.
Supply support for ISL85413FRTZ 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 support its high-performance analog and power management portfolio.
The ISL85413FRTZ belongs to Renesas' wide-input synchronous buck regulator product line, designed specifically for ruggedized industrial, medical, and transportation applications demanding high input voltage tolerance and minimal external components.
FAQ
What is the maximum input voltage rating for the ISL85413FRTZ?
The ISL85413FRTZ has an absolute maximum input voltage rating of +43V, with recommended operating range from +3.5V to +40V. Exceeding 40V continuously may reduce reliability or trigger overvoltage protection; operation at 40V is fully characterized and supported across the full -40°C to +125°C junction temperature range.
Does the ISL85413FRTZ require external compensation components?
No, the ISL85413FRTZ features internal Type-II compensation (150kΩ series resistor + 54pF capacitor to ground), eliminating the need for external compensation networks. This simplifies design, improves stability margin, and reduces bill-of-materials cost and PCB area compared to controllers requiring external compensation.
How does the MODE pin affect light-load efficiency in the ISL85413FRTZ?
When the MODE pin is grounded, the ISL85413FRTZ enters automatic PFM mode below ~150mA load, reducing quiescent current to 50µA and maintaining >80% efficiency at 1mA. Pulling MODE high forces continuous PWM mode regardless of load, trading light-load efficiency for fixed-frequency EMI control.
What thermal management is required for the ISL85413FRTZ in high-ambient environments?
The ISL85413FRTZ requires the exposed thermal pad (EPAD) to be soldered to a solid GND plane using at least five thermal vias. With this layout, θJA is 47°C/W; at 300mA output into 5V with 24V input, junction temperature rise is ~45°C above ambient - ensuring safe operation up to +80°C ambient when derated per thermal data.
Can the ISL85413FRTZ be used to generate 1.0V output?
Yes, the ISL85413FRTZ supports 1.0V output using the FB pin and external resistor divider. Per Table 1 in the datasheet, a 90.9kΩ top resistor (R1) and 137kΩ bottom resistor (R2) set VOUT = 1.0V. The 600mV reference and tight FB voltage tolerance (±10mV) ensure accurate regulation across temperature and load.
ISL85413FRTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tray
- 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 FAQ
1.How can I place an order for ISL85413FRTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85413FRTZ 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 reliable?
The price and inventory of ISL85413FRTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85413FRTZ is usually 5 days.
3.What payment methods are accepted for ISL85413FRTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85413FRTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85413FRTZ?
ISL85413FRTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85413FRTZ 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?
For technical support, including ISL85413FRTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85413FRTZ requirements.
6.How does Aetrix verify that ISL85413FRTZ is sourced from the original manufacturer or authorized distributors?
All ISL85413FRTZ 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 meets industry standards.
7.What is the process for return or replacement of ISL85413FRTZ?
All ISL85413FRTZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL85413FRTZ, 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 part is unused and in its original packaging.
Return procedure for ISL85413FRTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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