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Renesas ISL85413FRTZ-T7A
- Part No.:
- ISL85413FRTZ-T7A
- Manufacturer:
- Renesas
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
ISL85413FRTZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,575
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Product details
Overview
ISL85413FRTZ-T7A from Renesas Electronics (formerly Intersil) is a wide-input synchronous buck regulator delivering up to 300mA continuous output current with input voltage range 3.5V to 40V, fixed 700kHz switching frequency, integrated high-side/low-side NMOS FETs, and selectable PFM/PWM light-load operation - used in industrial power rails and battery-powered instrumentation.
For engineers reviewing the ISL85413FRTZ-T7A datasheet, ISL85413FRTZ-T7A pinout, ISL85413FRTZ-T7A application, or ISL85413FRTZ-T7A equivalent, key selection criteria include its -40°C to +125°C junction temperature rating, internal soft-start (2.3ms), power-good open-drain output, and minimal external component count enabled by internal compensation and bias LDO.
Technical Context
The ISL85413FRTZ-T7A implements peak current-mode control with 930mV/A current sense transresistance and 450mV/T slope compensation for stable loop response across input and load variations. Its PWM latch-based gate drive ensures precise dead-time management between integrated NMOS switches.
Light-load operation is managed via zero-current detection: eight consecutive zero-crossing events trigger automatic transition to PFM mode, reducing quiescent current to 50µA while maintaining regulation. The MODE pin allows forced PWM or logic-controlled PFM entry, and internal 5MΩ pull-down prevents floating states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 40V - supports 12V/24V industrial buses and 3S–10S Li-ion battery stacks without pre-regulation. |
| Output Current | 300mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained systems. |
| Switching Frequency | 700kHz nominal - enables compact magnetics (e.g., 10–47µH inductors) and reduces output ripple without requiring EMI filters. |
| Feedback Reference | 0.599V ±10mV - sets output voltage via resistor divider; enables 1.0V to 12V programmable outputs with <±1.5% load regulation. |
| Junction Temp Range | -40°C to +125°C - qualified for harsh environments including motor drives and outdoor telecom equipment. |
| Quiescent Current | 50µA in PFM mode - extends battery life in always-on portable instrumentation and remote sensors. |
| Power-Good Threshold | 94% / 121% of VREF window - provides reliable startup sequencing and fault indication with 10% hysteresis. |
Pinout & Package
The ISL85413FRTZ-T7A is housed in an RoHS-compliant 3mm × 3mm TDFN-8 package with exposed thermal pad (EPAD), optimized for high-power-density PCB layouts and thermal dissipation in industrial enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE | Mode selection input | Logic-level control for PFM (GND) or forced PWM (VCC); internal 5MΩ pull-down ensures defined state if unconnected. |
| BOOT | Bootstrap supply node | Drives high-side NMOS gate; requires 100nF ceramic capacitor to PHASE for charge replenishment each cycle. |
| VIN | Main power input | Supplies both power stage and internal 5V LDO; requires ≥10µF local ceramic decoupling to PGND. |
| PHASE | Switch node | Connects integrated high/low-side FETs to external inductor; fast 10ns rise time supports high-frequency operation. |
| EN | Enable input | Active-high enable with 1.45V threshold; tied to VIN for auto-start; must not connect to VCC to avoid LDO conflict. |
| PG | Open-drain power-good | Signals regulation status; pulled low during soft-start or FB out-of-window; includes internal 5MΩ pull-up. |
| VCC | Bias LDO output | 5V ±0.5V regulated supply for internal circuitry; decoupled with 1µF ceramic to PGND at pin. |
| FB | Feedback input | Inverting input of error amplifier; monitors output via resistor divider; also used by PG and UVLO circuits. |
| GND / EPAD | Signal & thermal ground | Must connect to PCB ground plane via ≥5 vias; EPAD is electrically tied to GND and critical for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Topology | Integrated 900mΩ high-side and 500mΩ low-side NMOS FETs eliminate external MOSFETs and reduce conduction losses. |
| No External Compensation | Internal 150kΩ/54pF RC network eliminates need for external loop compensation components. |
| Selectability Between PFM & PWM | MODE pin enables system-level efficiency optimization: PFM for battery runtime, PWM for EMI-sensitive applications. |
| Robust Protection Suite | Includes overcurrent (0.6A peak limit), overtemperature (150°C shutdown), boot undervoltage, and negative current limiting (-0.3A). |
| Internal Soft-Start | 2.3ms monotonic output ramp prevents inrush current and stabilizes downstream LDOs or clock circuits. |
Applications
| Industrial Control | Medical Devices |
|---|---|
Use Scenario: Powering PLC I/O modules and sensor signal conditioners in factory automation cabinets with 24V DC bus. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator converting unregulated 24V rail to MCU and ADC supply. Use Value: Wide 3.5–40V input accommodates bus voltage sag and surges; 125°C rating ensures reliability in enclosed control panels. | Use Scenario: Supplying isolated data acquisition front-ends in portable ultrasound and patient monitors. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current buck converter for analog sensor chains and low-power microcontrollers. Use Value: 50µA PFM quiescent current extends battery life; internal soft-start avoids transient-induced sensor offset errors. |
| Portable Instrumentation | Distributed Power Supplies |
Use Scenario: Regulating power for handheld multimeters, gas detectors, and field calibrators operating from 3S Li-ion packs. IC Role / Device Role / Timing Role: Single-chip 3.3V regulator handling full battery voltage range (10.8V–12.6V) without intermediate stages. Use Value: 40V absolute max rating provides margin against load-dump transients; small 3×3mm TDFN saves board area in compact enclosures. | Use Scenario: Providing auxiliary 1.8V/2.5V rails in cloud server PSUs and telecom line cards where space and thermal density are constrained. IC Role / Device Role / Timing Role: Secondary buck regulator for FPGA I/O banks or SerDes PHYs requiring tightly regulated low-voltage supplies. Use Value: 700kHz switching enables small 10–16µH inductors; power-good output sequences FPGA configuration with host controller. |
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, 600mA output, 2MHz switching, no PFM mode, different pinout (SOIC-8) | Higher current and frequency but lacks light-load efficiency optimization and integrated soft-start | Choose when higher output current or faster transient response is required, and board layout allows SOIC-8 footprint. |
| TPS563201DDFR | 4.5V–17V input, 3A output, 500kHz, integrated compensation, PFM/PWM selectable | Narrower input range limits use in 24V industrial or battery systems; higher current capability exceeds ISL85413FRTZ-T7A's scope | Prefer for low-input-voltage, high-current applications like USB-C PD accessories where 17V max input is acceptable. |
Compared with MP2451DT-LF-Z and TPS563201DDFR, the ISL85413FRTZ-T7A uniquely balances ultra-wide input range (3.5–40V), robust industrial temperature rating, and integrated light-load efficiency - making it optimal for space-constrained, high-reliability 24V/48V distributed systems where BOM count and thermal design simplicity are critical.
Availability
ISL85413FRTZ-T7A is available at Aetrix Electronics and suitable for industrial control, medical devices, and portable instrumentation requiring stable component supply across extended temperature and voltage ranges.
Supply support for ISL85413FRTZ-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 is a global semiconductor leader formed from the merger of Renesas Technology and NEC Electronics, specializing in microcontrollers, analog power, and connectivity solutions.
The ISL85413FRTZ-T7A belongs to Renesas' legacy Intersil analog power portfolio, designed specifically for high-voltage, low-to-moderate current DC-DC conversion in industrial and medical equipment where reliability, small size, and minimal external components are essential.
FAQ
What is the maximum input voltage rating for the ISL85413FRTZ-T7A?
The ISL85413FRTZ-T7A has an absolute maximum input voltage rating of +43V, with recommended operation from +3.5V to +40V. This wide range enables direct connection to 24V and 36V industrial buses and multi-cell battery packs. Exceeding 40V continuously may impact long-term reliability, and operation above 43V violates absolute maximum ratings and risks permanent damage to the ISL85413FRTZ-T7A.
Does the ISL85413FRTZ-T7A require external compensation components?
No, the ISL85413FRTZ-T7A features internal compensation with a fixed 150kΩ/54pF RC network, eliminating the need for external loop compensation components. This simplifies design, reduces BOM count, and improves consistency across production units. The ISL85413FRTZ-T7A achieves stable regulation across its full input and load range without user-adjustable compensation.
How does the MODE pin affect light-load efficiency in the ISL85413FRTZ-T7A?
The MODE pin on the ISL85413FRTZ-T7A selects between PFM (grounded) and forced PWM (tied to VCC or logic high). In PFM mode, the ISL85413FRTZ-T7A reduces switching frequency under light loads to cut gate charge losses, achieving 50µA quiescent current. This significantly extends battery life in portable applications compared to fixed-frequency PWM operation.
What thermal considerations apply to the ISL85413FRTZ-T7A in high-ambient environments?
The ISL85413FRTZ-T7A operates from -40°C to +125°C junction temperature and uses a thermally enhanced 3mm×3mm TDFN package with exposed pad. To maintain safe junction temperatures in high-ambient settings, the EPAD must be soldered to a PCB ground plane using ≥5 thermal vias. With proper layout, the ISL85413FRTZ-T7A sustains full 300mA output at +85°C ambient without derating.
Can the ISL85413FRTZ-T7A be used to generate 1.0V output?
Yes, the ISL85413FRTZ-T7A supports 1.0V output using an external resistor divider on the FB pin, referenced to its 0.599V internal feedback voltage. Table 1 in the datasheet specifies R1 = 90.9kΩ and R2 = 137kΩ for 1.0V output. The ISL85413FRTZ-T7A maintains ±1.5% load regulation and tight line regulation across its input range when configured for 1.0V, making it suitable for low-voltage FPGA or ASIC core supplies.
ISL85413FRTZ-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:
- 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-T7A FAQ
1.How can I place an order for ISL85413FRTZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85413FRTZ-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 ISL85413FRTZ-T7A reliable?
The price and inventory of ISL85413FRTZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85413FRTZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL85413FRTZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85413FRTZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85413FRTZ-T7A?
ISL85413FRTZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85413FRTZ-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 ISL85413FRTZ-T7A?
For technical support, including ISL85413FRTZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85413FRTZ-T7A requirements.
6.How does Aetrix verify that ISL85413FRTZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL85413FRTZ-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 ISL85413FRTZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL85413FRTZ-T7A?
All ISL85413FRTZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL85413FRTZ-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 ISL85413FRTZ-T7A part is unused and in its original packaging.
Return procedure for ISL85413FRTZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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