My Inquiry
My Account
Renesas ISL85418FRZ-T
- Part No.:
- ISL85418FRZ-T
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85418FRZ-T.pdf
- Description:
- IC REG BUCK ADJ 800MA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,452
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL85418FRZ-T from Renesas Electronics is a wide-input synchronous buck regulator delivering up to 800mA output current with 3V–40V input range, 500kHz default switching frequency (adjustable 300kHz–2MHz), integrated high-side/low-side NMOS FETs, and PFM/PWM light-load mode selection - used in industrial control power rails and battery-powered instrumentation.
For engineers reviewing the ISL85418FRZ-T datasheet, ISL85418FRZ-T pinout, ISL85418FRZ-T application, or ISL85418FRZ-T equivalent, key selection criteria include input voltage tolerance, internal compensation capability, soft-start programmability, power-good signaling, and thermal shutdown behavior across -40°C to +125°C operation.
Technical Context
The ISL85418FRZ-T implements peak current-mode PWM control with 450mV/T slope compensation and 500mV/A current sense gain, enabling stable loop response and inherent input ripple rejection. It integrates a 5V bias LDO and supports both internal (COMP tied to VCC) and external (RC network from COMP to GND) compensation topologies.
Light-load operation is managed via SYNC pin logic: grounded for automatic PFM/PWM transition, pulled high for forced PWM, or driven by external clock for synchronization. Overcurrent protection uses cycle-by-cycle peak limiting (1.2A typ) with hiccup-mode recovery and negative current limit (-0.6A typ) to prevent reverse inductor conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports direct connection to 12V/24V industrial buses and 3S–10S Li-ion battery packs without pre-regulation. |
| Output Current | Continuous 800mA - sufficient for powering microcontrollers, sensors, and interface ICs in compact embedded systems. |
| Switching Frequency | Default 500kHz (±14%), adjustable 300kHz–2MHz via FS pin resistor - enables optimization of size vs. efficiency and EMI filtering requirements. |
| Feedback Reference Voltage | 0.599V (±0.007V over -40°C to +125°C) - sets precise output regulation with external resistor divider; enables 1.8V–12V outputs. |
| Power-Good Threshold | ±6% window around VREF (90–120% of 0.599V) - provides reliable system reset and sequencing control with 10% propagation delay relative to soft-start completion. |
| Thermal Shutdown | 150°C trip with 20°C hysteresis - protects against sustained overload or poor PCB thermal design while allowing safe restart after cooling. |
| Quiescent Current | 80µA typical at VIN=12V - minimizes standby power loss in always-on battery applications. |
Pinout & Package
ISL85418FRZ-T 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 for optimal thermal performance and EMI reduction.
| 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 & sync input | Logic level selects PFM (GND), forced PWM (VCC), or external clock sync (≥300kHz); internal 5MΩ pull-down ensures defined state. |
| 3 BOOT | Bootstrap supply | Connects 100nF capacitor to PHASE to generate gate drive voltage for high-side NMOS - critical for proper high-side FET turn-on. |
| 4 VIN | Main power input | Supplies power stage and internal LDO; requires ≥4.7µF ceramic decoupling close to pin to suppress high-frequency noise. |
| 5 PHASE | Switch node | Drives external inductor; connects internal high-side/low-side FETs - layout must minimize loop area to reduce EMI and switching losses. |
| 6 PGND | Power ground return | Low-impedance path for inductor current and high-side FET source - must connect directly to PCB GND plane, separate from signal GND. |
| 7 EN | Enable control | Active-high input; >1V enables regulator; tie to VIN for auto-start; not compatible with VCC due to LDO control dependency. |
| 8 PG | Open-drain power-good | Pulled low during soft-start or if FB voltage deviates >6% from 0.599V; internal 5MΩ pull-up enables direct MCU GPIO monitoring. |
| 9 VCC | Bias LDO output | 5V ±0.6V regulated supply for internal circuitry; decouple with 1µF ceramic to PGND - not intended as system supply rail. |
| 10 FB | Voltage feedback input | Inverting input of error amplifier; monitors output via resistor divider; also used by UVLO and PG circuits - high-impedance (≤150nA leakage). |
| 11 COMP | Error amplifier output | Connect to VCC for internal compensation; add RC network to GND for external loop tuning - gm = 50µA/V (internal) or 230µA/V (external). |
| 12 FS | Frequency select | Tie to VCC for 500kHz; connect resistor to GND for 300kHz–2MHz adjustment - voltage at FS pin is ~0.4V during operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual NMOS power stage | Eliminates external MOSFETs and drivers; RDS(on) = 350mΩ (high-side) / 130mΩ (low-side) reduces BOM count and layout complexity. |
| Selectable PFM/PWM light-load mode | Extends battery life in portable devices by reducing switching losses at light loads while maintaining regulation accuracy. |
| Internal or external loop compensation | Reduces design iteration time: internal compensation works out-of-box; external RC network allows fine-tuning for specific output caps and load dynamics. |
| Programmable soft-start | Prevents output overshoot and inrush stress on downstream components using either internal 2ms timer or user-defined capacitor-based ramp. |
| Robust protection suite | Includes overcurrent (hiccup mode), overtemperature (150°C), boot undervoltage, and negative current limit - enables reliable operation in harsh environments. |
Applications
| Industrial Control Power Supply | Portable Medical Instrumentation |
|---|---|
Use Scenario: Powering PLC I/O modules and sensor interfaces in factory automation cabinets with 24V DC bus input. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator converting unregulated 24V to stable logic supply. Use Value: Wide 3V–40V input handles brownouts and transients; integrated FETs reduce board space; -40°C to +125°C rating ensures reliability in enclosures. |
Use Scenario: Supplying ADCs, op-amps, and Bluetooth LE radios in handheld patient monitors powered by 2-cell Li-ion batteries. IC Role / Device Role / Timing Role: Efficient step-down converter delivering 3.3V from 6V–8.4V battery stack with ultra-low quiescent current. Use Value: PFM mode extends runtime at standby; soft-start prevents sensor offset drift during power-up; small DFN footprint saves PCB area. |
| Distributed Cloud Infrastructure PSU | Automated Test Equipment (ATE) Bias Rail |
Use Scenario: Generating auxiliary 12V/5V rails for FPGA configuration, fan control, and management controllers in 1U server PSUs. IC Role / Device Role / Timing Role: Secondary regulator fed from intermediate 12V bus, providing isolated low-noise supplies for sensitive analog subsystems. Use Value: Synchronization capability (SYNC pin) aligns switching to master clock, reducing beat frequencies and EMI in dense multi-rail systems. |
Use Scenario: Providing precision 2.5V/3.3V reference rails for DACs, comparators, and calibration circuitry in benchtop ATE platforms. IC Role / Device Role / Timing Role: Low-noise, tightly regulated output stage with excellent line/load regulation (<±0.5%) and fast transient response. Use Value: Internal compensation and low output impedance ensure stability with ceramic output caps; PG signal enables automated test sequencing. |
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 input 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–2.2MHz adjustable, enable/sync pins | Higher current capability but narrower input range; lacks negative current limit and boot UVLO | Choose when >800mA load current is required and input stays within 4.5V–28V; verify thermal margin at full load. |
Compared with MP2451DT-LF-Z and TPS54202DRCT, the ISL85418FRZ-T uniquely combines 40V max input, true PFM/PWM selection, negative current limiting, and robust industrial temperature range - making it optimal for high-reliability, wide-input, battery-or-bus-fed applications where efficiency across load range and fault resilience are critical.
Availability
ISL85418FRZ-T is available at Aetrix Electronics and suitable for industrial control, portable medical instrumentation, and distributed cloud infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL85418FRZ-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 is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT markets with emphasis on reliability and functional safety.
The ISL85418FRZ-T belongs to Renesas' ISL85xx family of wide-input synchronous buck regulators designed specifically for rugged industrial and battery-powered applications demanding high efficiency, small footprint, and extended temperature operation.
FAQ
What is the maximum input voltage rating for the ISL85418FRZ-T?
The ISL85418FRZ-T has an absolute maximum input voltage rating of +43V, with recommended operating range from 3V to 40V. This allows direct use with 36V nominal industrial buses and up to 10S Li-ion battery stacks (42V fully charged), provided appropriate input transient protection is implemented per system requirements.
Does the ISL85418FRZ-T support external frequency synchronization?
Yes, the ISL85418FRZ-T supports external synchronization via the SYNC pin. When driven with a clean CMOS clock signal exceeding the programmed switching frequency (300kHz–2MHz), the device locks to the external source on the rising edge - enabling EMI reduction in multi-rail systems and deterministic timing in synchronized power architectures.
How is soft-start configured on the ISL85418FRZ-T?
The ISL85418FRZ-T offers two soft-start methods: (1) tie SS pin to VCC for fixed 2ms internal ramp, or (2) connect a capacitor from SS to GND, where ramp time equals CSS × 0.55V/5.5µA. The FB pin follows the SS ramp until reaching 0.6V, ensuring monotonic VOUT rise without overshoot or inrush stress.
What protection features does the ISL85418FRZ-T include?
The ISL85418FRZ-T integrates overcurrent protection (1.2A peak limit with hiccup recovery), overtemperature shutdown (150°C with 20°C hysteresis), boot undervoltage lockout, negative current limiting (-0.6A), and power-good monitoring. All protections assert PG low and disable switching until fault clearance and soft-start restart.
Can the ISL85418FRZ-T operate with only internal compensation?
Yes, the ISL85418FRZ-T supports fully internal compensation: simply tie the COMP pin to VCC. This configures the error amplifier with 50µA/V transconductance and built-in poles/zeros, enabling stable operation with standard ceramic output capacitors without external RC networks - ideal for rapid prototyping and cost-sensitive designs.
ISL85418FRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN 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):
- 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-T FAQ
1.How can I place an order for ISL85418FRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85418FRZ-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 ISL85418FRZ-T reliable?
The price and inventory of ISL85418FRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85418FRZ-T is usually 5 days.
3.What payment methods are accepted for ISL85418FRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85418FRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85418FRZ-T?
ISL85418FRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85418FRZ-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 ISL85418FRZ-T?
For technical support, including ISL85418FRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85418FRZ-T requirements.
6.How does Aetrix verify that ISL85418FRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL85418FRZ-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 ISL85418FRZ-T meets industry standards.
7.What is the process for return or replacement of ISL85418FRZ-T?
All ISL85418FRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL85418FRZ-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 ISL85418FRZ-T part is unused and in its original packaging.
Return procedure for ISL85418FRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL85418FRZ-T 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…
