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Renesas ISL85003FRZ
- Part No.:
- ISL85003FRZ
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85003FRZ.pdf
- Description:
- IC REG BUCK ADJ 3A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,348
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Product details
Overview
ISL85003FRZ from Renesas Electronics is a highly efficient 3A synchronous buck regulator with integrated high-side (65mΩ) and low-side (45mΩ) NFETs, operating from 4.5V to 18V input and delivering ±1% output regulation down to 0.8V. It supports automatic DCM/CCM mode switching for light-load efficiency and features internal 500kHz switching frequency with external synchronization up to 2MHz - ideal for point-of-load regulation in industrial embedded systems.
For engineers reviewing the ISL85003FRZ datasheet, ISL85003FRZ pinout, ISL85003FRZ application, or ISL85003FRZ equivalent, key selection considerations include its 12-lead 3mm×4mm DFN package, open-drain power-good (PG) output with 85% threshold, programmable soft-start via external capacitor (on ISL85003A), and robust protection including overcurrent, overvoltage, and thermal shutdown.
Technical Context
The ISL85003FRZ implements current-mode control with slope compensation (550mV/µs at 500kHz), enabling stable loop response across wide VIN/VOUT ranges. Its dual-phase architecture integrates gate drivers optimized for low rDS(ON) FETs and includes an internal 5V LDO (VDD) derived from VIN for analog core biasing.
DCM/CCM transition is managed by zero-cross detection and negative current limiting, while fault handling combines positive/negative overcurrent protection (5.0A / –2.2A typical), input overvoltage lockout (20V), and thermal shutdown at 165°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports standard 12V rails and wide-input industrial supplies without pre-regulation. |
| Output Current | Continuous 3A - sufficient for FPGA I/O, microcontroller cores, and ASIC auxiliary rails. |
| Output Voltage Accuracy | ±1% over line/load/temperature - ensures tight regulation for sensitive digital loads. |
| Switching Frequency | 500kHz fixed (internal), syncable 300kHz–2MHz - balances EMI, size, and efficiency in compact layouts. |
| High-Side rDS(ON) | 65mΩ @ 100mA - minimizes conduction loss in high-duty-cycle applications (e.g., 5V→3.3V). |
| Low-Side rDS(ON) | 45mΩ @ 100mA - reduces freewheeling loss and improves light-load DCM efficiency. |
| Power-Good Threshold | 85% of regulated output - provides reliable system sequencing with 1.5ms rising-edge delay. |
Pinout & Package
ISL85003FRZ is housed in a thermally enhanced 12-lead 3mm×4mm Dual Flat No-Lead (DFN) package with exposed PGND pad for PCB heat dissipation. AGND and PGND are internally connected but must share the same ground plane potential.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | Synchronization input | Configures CCM/DCM mode or accepts external clock (300kHz–2MHz); internal 1MΩ pull-up to VDD. |
| 2 (PG) | Open-drain power-good output | Asserts high after output reaches 85% of target; requires external 10kΩ–100kΩ pull-up to VDD or ≤5.5V rail. |
| 3 (EN) | Enable input | Active-high logic: device enabled when voltage exceeds 0.6V (60mV hysteresis). |
| 4 (FB) | Feedback node | Connects to resistor divider; sets output voltage with 0.8V reference (±8mV tolerance). |
| 5 (COMP) | Compensation node | Internal compensation selected by shorting to AGND; external network enables custom loop tuning. |
| 6 (AGND) | Analog ground reference | Return path for error amplifier and control circuitry; must be tied to same ground plane as PGND. |
| 7,8 (PHASE) | Switch node | Drives external inductor; connects directly to boot capacitor (0.1µF) and low-side FET source. |
| 9,10 (VIN) | Main power input | Supplies high-side driver and internal LDO; requires local 10µF ceramic decoupling to PGND. |
| 11 (VDD) | LDO output | Internally generated 5V supply (4.3–5.5V); bypass with 1µF capacitor; tie to VIN if VIN = 4.5–5.5V. |
| 12 (BOOT) | Bootstrap supply | Floating gate drive rail for high-side FET; capacitor (0.1µF) placed between BOOT and PHASE. |
| 13 (PGND) | Power ground | Source connection for low-side FET and thermal pad; requires ≥8 vias to inner ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side NFETs | Eliminates external MOSFET selection and layout complexity; 65mΩ/45mΩ rDS(ON) enables >95% peak efficiency. |
| Automatic DCM/CCM mode switching | Maintains high light-load efficiency without manual mode control or external circuitry. |
| External frequency synchronization | Enables noise-sensitive designs to align switching with system clocks or avoid EMI bands (300kHz–2MHz). |
| Programmable soft-start (via external cap) | Prevents inrush current and output overshoot; default 2ms ramp time without capacitor. |
| Comprehensive fault protection | Includes positive/negative overcurrent, input/output overvoltage, thermal shutdown, and BOOT undervoltage detection. |
Applications
| Industrial Process Control | Network Equipment Power |
|---|---|
|
Use Scenario: Regulating 3.3V/2.5V rails for PLC I/O modules and sensor interfaces operating from 12V or 24V field buses. IC Role / Device Role / Timing Role: Primary point-of-load DC/DC converter delivering stable 3A output with fast transient response. Use Value: ±1% regulation and thermal protection ensure uptime in uncooled enclosures; DCM mode extends battery life in portable HMI units. |
Use Scenario: Generating 1.2V/1.8V core voltages for Ethernet switches and routers powered from 12V backplanes. IC Role / Device Role / Timing Role: Synchronous buck regulator with 500kHz switching synchronized to system clock to reduce conducted EMI. Use Value: Integrated FETs and internal compensation reduce BOM count by 6 components vs discrete solutions; PG signal enables safe FPGA configuration sequencing. |
| Multifunction Printer Logic Rails | Embedded Computing Power |
|
Use Scenario: Supplying 5V/3.3V to print engine controllers, motor drivers, and USB peripherals in space-constrained MFP chassis. IC Role / Device Role / Timing Role: Compact 3mm×4mm DFN buck regulator supporting multiple output voltages via resistor dividers. Use Value: Small footprint saves PCB area; 18V max input accommodates 12V+ surge conditions during motor startup. |
Use Scenario: Powering ARM-based SoCs and DDR memory in edge AI gateways requiring clean, low-noise 1.1V/1.35V rails. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with precise 0.8V reference and tight load regulation. Use Value: 95% peak efficiency reduces thermal load on sealed enclosures; PG output confirms rail stability before firmware boot. |
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 | 3A, 4.5–36V input, fixed 500kHz, no SYNC pin, no PG output, 10-pin SOIC package | Lacks synchronization and power-good signaling; suited for cost-sensitive, non-EMI-critical applications | Select when board space allows SOIC and system-level timing coordination is unnecessary |
| TPS54302DDCR | 3A, 4.5–28V input, 500kHz, SYNC capable, PG output, 10-pin WSON package | Higher VIN max (28V), lower quiescent current (25µA), but higher rDS(ON) (90mΩ/60mΩ) | Choose for wider input range and ultra-low standby power; verify thermal performance at full 3A load |
Compared with MP2451DT-LF-Z and TPS54302DDCR, the ISL85003FRZ offers superior light-load efficiency via DCM/CCM auto-switching, tighter output accuracy (±1% vs ±2%), and lower conduction losses - making it optimal for thermally constrained, high-reliability industrial point-of-load designs.
Availability
ISL85003FRZ is available at Aetrix Electronics and suitable for industrial process control, network equipment power, and embedded computing applications requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for ISL85003FRZ 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 timing solutions for industrial, automotive, and infrastructure markets.
The ISL85003FRZ belongs to Renesas' high-efficiency integrated buck regulator product line, designed specifically for compact, high-reliability point-of-load conversion in space- and thermal-constrained embedded systems.
FAQ
What is the maximum input voltage rating for the ISL85003FRZ?
The ISL85003FRZ has an absolute maximum input voltage rating of +22V, but its recommended operating range is 4.5V to 18V. Operation above 18V may trigger input overvoltage protection (19–20V threshold), causing shutdown. For sustained reliability, maintain VIN ≤18V per datasheet specifications.
Does the ISL85003FRZ support external compensation?
Yes, the ISL85003FRZ supports both internal and external compensation. Connecting COMP to AGND selects internal compensation. For custom loop response, place an external RC network between COMP and FB - detailed design equations and stability guidelines are provided in the FN7968 datasheet Section "Loop Compensation Design".
How does the ISL85003FRZ handle light-load conditions?
The ISL85003FRZ automatically transitions between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) based on load current. In DCM, it disables the low-side FET at light loads to minimize switching losses, achieving >85% efficiency at 10mA - critical for battery-powered or always-on industrial sensors.
What is the function of the SYNC pin on the ISL85003FRZ?
The SYNC pin on the ISL85003FRZ serves three roles: (1) connect to AGND for forced DCM operation, (2) connect to VDD for forced CCM, or (3) accept an external clock (300kHz–2MHz, positive-edge triggered) for EMI reduction. An internal 1MΩ pull-up prevents floating states, ensuring defined startup behavior.
Can the ISL85003FRZ be used with pre-biased outputs?
Yes, the ISL85003FRZ supports prebiased output startup. Its current-mode architecture and controlled gate drive sequencing prevent reverse current flow during start-up into an already charged output capacitor - verified in Figure 20 (start-up at 3A load) of the FN7968 datasheet.
ISL85003FRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 3A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
ISL85003FRZ FAQ
1.How can I place an order for ISL85003FRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85003FRZ 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 ISL85003FRZ reliable?
The price and inventory of ISL85003FRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85003FRZ is usually 5 days.
3.What payment methods are accepted for ISL85003FRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85003FRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85003FRZ?
ISL85003FRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85003FRZ 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 ISL85003FRZ?
For technical support, including ISL85003FRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85003FRZ requirements.
6.How does Aetrix verify that ISL85003FRZ is sourced from the original manufacturer or authorized distributors?
All ISL85003FRZ 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 ISL85003FRZ meets industry standards.
7.What is the process for return or replacement of ISL85003FRZ?
All ISL85003FRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL85003FRZ, 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 ISL85003FRZ part is unused and in its original packaging.
Return procedure for ISL85003FRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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