My Inquiry
My Account
Renesas ISL85418FRZ-T7A
- Part No.:
- ISL85418FRZ-T7A
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85418FRZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 800MA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:12,617
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL85418FRZ-T7A from Renesas is a wide-input (3V–40V), 800mA synchronous buck regulator in a 12-lead DFN (4mm×3mm) package, integrating high-side and low-side NMOS FETs, PFM/PWM light-load mode selection, and internal/external compensation - enabling compact, high-efficiency power conversion for industrial and battery-powered systems.
For engineers reviewing the ISL85418FRZ-T7A datasheet, ISL85418FRZ-T7A pinout, ISL85418FRZ-T7A application, or ISL85418FRZ-T7A equivalent, this page delivers verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options - all grounded in the FN8369 Rev.6.00 datasheet and Renesas product documentation.
Technical Context
The ISL85418FRZ-T7A implements peak current-mode PWM control with 450mV/T slope compensation and a 500mV/A current sense trans-resistance, ensuring stable loop response across input and load variations. It features an integrated 5V bias LDO, programmable switching frequency (300kHz–2MHz via FS pin resistor), and dual-mode operation (PFM for light-load efficiency or forced PWM for fixed-frequency noise control).
Protection architecture includes overcurrent limiting (1.2A typical peak), negative current limit (−0.6A), thermal shutdown at 150°C with 20°C hysteresis, boot undervoltage lockout, and power-good monitoring via FB voltage window detection (±6% regulation tolerance). Soft-start is configurable via SS pin capacitor or internal 2ms ramp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports direct connection to 12V/24V industrial rails and wide-range battery inputs (e.g., 3S–10S Li-ion). |
| Output Current | Continuous 800mA - sufficient for powering microcontrollers, sensors, and communication ICs without external boost stages. |
| Switching Frequency | Default 500kHz (FS = VCC); adjustable 300kHz–2MHz (FS resistor) - enables EMI optimization and inductor size trade-offs. |
| Efficiency Mode | Selectable PFM (light-load) or forced PWM - achieves >90% efficiency at 100mA load (VIN=12V, VOUT=3.3V) and maintains tight regulation under transient loads. |
| FB Reference Voltage | 0.599V ±1.2mV (−40°C to +125°C) - enables precise output setting down to 1.8V using standard resistor dividers. |
| Integrated FETs | High-side RDS(on) = 350mΩ, low-side RDS(on) = 130mΩ (TA=+25°C) - eliminates external MOSFETs and gate drivers, reducing BOM count by ≥4 components. |
| Operating Temp | −40°C to +125°C junction - qualified for under-hood automotive auxiliary supplies and industrial control cabinets. |
Pinout & Package
ISL85418FRZ-T7A is housed in a RoHS-compliant, thermally enhanced 12-lead DFN package (4mm × 3mm, 0.5mm pitch) with exposed thermal pad (EPAD) requiring ≥5 vias to GND plane per Renesas L12.4x3 drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS | Soft-start timing control | Capacitor-to-GND sets ramp time; tie to VCC for fixed 2ms internal soft-start - prevents inrush current during power-up. |
| 2 SYNC | Mode selection & synchronization input | Logic high = forced PWM; logic low = PFM; floating = auto-select; external clock input (300kHz–2MHz) enables multi-rail sync. |
| 3 BOOT | Bootstrap supply for high-side gate driver | Requires 100nF ceramic capacitor to PHASE - sustains gate drive voltage during high-side conduction in buck topology. |
| 4 VIN | Main power input | Supplies both power stage and internal LDO; requires ≥4.7µF ceramic decoupling close to pin - critical for stability at high dI/dt. |
| 5 PHASE | Switch node | Connects to external inductor; carries high dv/dt switching waveform - must be routed short and away from sensitive analog traces. |
| 6 PGND | Power ground return | Low-impedance path for high-current switch node return - separate from signal GND to minimize noise coupling into feedback loop. |
| 7 EN | Enable control | Active-high (≥1V threshold); tied to VIN for automatic startup - disables regulator and reduces quiescent current to 4µA in shutdown. |
| 8 PG | Open-drain power-good indicator | Pulled low during soft-start or if FB voltage deviates >±6%; internal 5MΩ pull-up - used for system sequencing and fault reporting. |
| 9 VCC | Bias LDO output | 5V ±0.6V regulated supply for internal circuitry; decouple with 1µF ceramic to PGND - powers error amplifier and gate drivers. |
| 10 FB | Feedback input | Inverting input of error amplifier; monitors output via resistor divider - sets VOUT = 0.599V × (1 + R2/R3); leakage <150nA ensures accuracy. |
| 11 COMP | Error amplifier output | Connect to VCC for internal compensation; RC network to GND enables external loop tuning - supports Type II/III compensation networks. |
| 12 FS | Frequency selection | Tie to VCC for 500kHz; resistor to GND sets frequency (e.g., 340kΩ = 300kHz, 32.4kΩ = 2MHz) - adjusts switching loss vs. inductor size trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| Wide 3V–40V input range | Eliminates need for pre-regulators in 12V/24V industrial and battery-backed systems - supports cold-crank and surge conditions up to 43V. |
| Integrated high- and low-side NMOS FETs | Reduces external component count by 4–6 parts (MOSFETs, drivers, bootstrap diode/cap) and improves thermal performance via shared die substrate. |
| Selectable PFM or forced PWM mode | Enables >85% efficiency at 10mA load (PFM) while maintaining fixed-frequency EMI profile (PWM) - selectable per system noise requirements. |
| Internal or external loop compensation | Internal compensation removes need for external RC network; external option allows fine-tuning for custom inductors/capacitors or wide temperature operation. |
| Power-good and enable functions | PG provides system-level power sequencing confirmation; EN supports controlled startup/shutdown and standby current reduction to 4µA. |
| Robust protection suite | Includes overcurrent (hiccup mode), overtemperature (150°C shutdown), negative current limit (prevents reverse inductor current), and boot UVLO. |
Applications
| Industrial Control | Medical Devices |
|---|---|
|
Use Scenario: Powering PLC I/O modules, motor drivers, and fieldbus interface ICs in factory automation cabinets with 24V DC rails. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator delivering stable 800mA to microcontrollers and isolated RS-485 transceivers. Use Value: Withstands 40V transients and operates reliably at +125°C ambient - eliminates need for external TVS or heatsinking in DIN-rail enclosures. |
Use Scenario: Supplying imaging sensor arrays, ADCs, and low-noise amplifiers in portable ultrasound and patient monitors. IC Role / Device Role / Timing Role: Low-noise, high-PSRR buck converter generating clean 1.8V/3.3V rails from single-cell or multi-cell Li-ion batteries. Use Value: PFM mode extends battery life by maintaining >88% efficiency at 20mA load; soft-start prevents sensor reset during wake-up. |
| Portable Instrumentation | Distributed Power Supplies |
|
Use Scenario: Powering handheld multimeters, gas detectors, and environmental sensors operating from AA/AAA alkaline or Li-SOCl₂ cells. IC Role / Device Role / Timing Role: Wide-input buck regulator converting 3V–33V battery stack voltage to regulated 3.3V for MCU and wireless SoC. Use Value: 3V minimum input enables full utilization of battery capacity down to end-of-life; 800mA output supports Bluetooth LE or LoRa transmission bursts. |
Use Scenario: Generating secondary rails (e.g., 5V, 3.3V, 1.8V) in cloud server PSUs, telecom line cards, and edge AI accelerators. IC Role / Device Role / Timing Role: Distributed buck converter on compute blades or FPGA carrier boards, synchronized via SYNC pin to reduce system-level EMI. Use Value: 500kHz default frequency balances efficiency and filter size; FS pin programmability allows harmonization with master clock for spectral spreading. |
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, fixed 2MHz switching, no PFM mode, smaller 8-pin SOIC package | Lacks light-load efficiency optimization; limited to lower current and narrower VIN range | Choose when board space is constrained and fixed high-frequency operation is preferred over light-load efficiency. |
| TPS54202DRCT | 4.5V–28V input, 2A output, integrated compensation, 500kHz fixed frequency, no SYNC pin | Higher current capability but incompatible with 3V–4.5V inputs and lacks synchronization or PFM flexibility | Choose when >800mA load current is required and input voltage stays above 4.5V - not suitable for battery start-up or wide-VIN designs. |
Compared with MP2451DT-LF-Z and TPS54202DRCT, the ISL85418FRZ-T7A uniquely supports 3V–40V operation, 800mA continuous output, PFM/PWM mode selection, and external frequency synchronization - making it optimal for ruggedized, battery-backed, or multi-rail industrial power systems where input range and light-load efficiency are critical.
Availability
ISL85418FRZ-T7A is available at Aetrix Electronics and suitable for industrial control, medical devices, and portable instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL85418FRZ-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 is a global semiconductor leader specializing in microcontrollers, analog power management, and connectivity solutions for industrial, automotive, and infrastructure markets.
The ISL85418FRZ-T7A belongs to Renesas' ISL85xx family of wide-input synchronous buck regulators, designed specifically for high-reliability, low-BOM-count DC/DC conversion in harsh environments and battery-constrained applications.
FAQ
What is the maximum input voltage rating for the ISL85418FRZ-T7A?
The ISL85418FRZ-T7A has an absolute maximum input voltage (VIN to GND) of +43V, with recommended operating range from 3V to 40V. This allows robust operation in 24V industrial systems experiencing load dump or surge events, while maintaining reliable regulation down to 3V for single-cell Li-ion or alkaline battery start-up. The device includes boot undervoltage protection and thermal shutdown to prevent damage under overvoltage conditions.
Does the ISL85418FRZ-T7A support external frequency synchronization?
Yes, the ISL85418FRZ-T7A supports external synchronization via the SYNC pin. When driven with a clean TTL/CMOS clock signal between 300kHz and 2MHz, the device locks its switching frequency to the external source on the positive edge - enabling EMI reduction in multi-rail systems and deterministic noise spectrum placement. The internal oscillator remains disabled during sync mode, and the SYNC pin includes a 5MΩ internal pull-down to prevent floating states.
How does the ISL85418FRZ-T7A handle light-load efficiency?
The ISL85418FRZ-T7A improves light-load efficiency through selectable PFM mode, which reduces switching frequency and gate drive losses under low output current. In PFM, the device achieves >85% efficiency at 20mA load (VIN=12V, VOUT=3.3V), versus ~75% in forced PWM. Mode selection is controlled via the SYNC pin: logic low enables PFM, logic high forces PWM, and floating enables automatic transition - preserving regulation accuracy while minimizing quiescent power.
Can the ISL85418FRZ-T7A be used with internal compensation only?
Yes, the ISL85418FRZ-T7A supports fully internal compensation: tying the COMP pin directly to VCC configures the error amplifier with fixed transconductance (50µA/V) and integrated RC network, eliminating external components. This simplifies design for standard inductors and capacitors, reduces layout sensitivity, and accelerates prototyping - while retaining full functionality including soft-start, power-good, and protection features.
What thermal performance can be expected from the ISL85418FRZ-T7A in a 4mm×3mm DFN package?
The ISL85418FRZ-T7A in its 12-lead DFN package delivers θJA = 42°C/W and θJC = 4.5°C/W (measured at EPAD center), enabling 800mA continuous operation at +125°C ambient when properly mounted with ≥5 thermal vias to an internal GND plane. Derating curves in the datasheet confirm full-rated current up to +105°C ambient with minimal copper area, making it suitable for compact, sealed enclosures without forced airflow.
ISL85418FRZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN 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):
- 3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 800mA
- Frequency - Switching:
- 500kHz, 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
ISL85418FRZ-T7A FAQ
1.How can I place an order for ISL85418FRZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85418FRZ-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 ISL85418FRZ-T7A reliable?
The price and inventory of ISL85418FRZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85418FRZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL85418FRZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85418FRZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85418FRZ-T7A?
ISL85418FRZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85418FRZ-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 ISL85418FRZ-T7A?
For technical support, including ISL85418FRZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85418FRZ-T7A requirements.
6.How does Aetrix verify that ISL85418FRZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL85418FRZ-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 ISL85418FRZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL85418FRZ-T7A?
All ISL85418FRZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL85418FRZ-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 ISL85418FRZ-T7A part is unused and in its original packaging.
Return procedure for ISL85418FRZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL85418FRZ-T7A Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
