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Renesas ISL85003AFRZ-TK
- Part No.:
- ISL85003AFRZ-TK
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85003AFRZ-TK.pdf
- Description:
- IC REG BUCK ADJ 3A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,553
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Product details
Overview
ISL85003AFRZ-TK from Renesas Electronics is a synchronous buck regulator IC with integrated 65mΩ high-side and 45mΩ low-side N-channel MOSFETs, delivering up to 3A continuous output current from 4.5V–18V input. It operates in forced continuous conduction mode (CCM) at 500kHz, supports adjustable 0.8V–5V output via external resistors, and features ±1% output regulation over line/load/temperature. It is used in point-of-load power conversion for embedded computing and industrial 12V rail supplies.
For engineers reviewing the ISL85003AFRZ-TK datasheet, ISL85003AFRZ-TK pinout, ISL85003AFRZ-TK application, or ISL85003AFRZ-TK equivalent, key selection criteria include its fixed 500kHz CCM operation, programmable soft-start, open-drain power-good flag, internal compensation capability, and thermal/overcurrent/overvoltage protection architecture.
Technical Context
The ISL85003AFRZ-TK implements a current-mode control architecture with integrated slope compensation (550 mV/µs at 500kHz), enabling stable loop response across wide input/output conditions. Its error amplifier delivers 70dB gain and 5.5MHz open-loop bandwidth, supporting both internal compensation (COMP tied to AGND) and external network configurations.
Unlike the ISL85003 variant, the ISL85003A version replaces frequency synchronization (SYNC) with a dedicated soft-start (SS) pin, sourcing 2.5–4.5µA to charge an external capacitor for controlled output ramp-up. It lacks external sync capability but guarantees deterministic CCM operation without light-load DCM transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports standard 12V industrial rails and wide-input battery/supply systems. |
| Output Current | Continuous 3A - sufficient for FPGA core, microprocessor I/O, or ASIC auxiliary rails. |
| Switching Frequency | Fixed 500kHz - enables compact magnetics and predictable EMI profile without external sync circuitry. |
| Output Voltage Accuracy | ±1% over line/load/temperature - ensures tight regulation for sensitive digital loads without post-regulation. |
| Feedback Reference | 0.8V ±8mV - allows precise setting of low-voltage outputs (e.g., 1.2V, 1.8V, 3.3V) using standard 1% resistor dividers. |
| High-Side rDS(ON) | 65mΩ (typ.) - minimizes conduction loss at full load, contributing to >95% peak efficiency at 12VIN→5VOUT. |
| Low-Side rDS(ON) | 45mΩ (typ.) - reduces bottom-FET conduction loss and improves light-load efficiency in forced CCM. |
Pinout & Package
ISL85003AFRZ-TK uses a 12-lead 3mm × 4mm Dual Flat No-Lead (DFN) package with exposed thermal pad (EPAD). The package provides low thermal resistance (θJC = 5°C/W) and requires PCB mounting with ≥8 vias to ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SS) | Soft-Start Input | 4µA current source charges external capacitor; sets output voltage ramp time (default 2ms, adjustable up to >10ms). |
| 2 (PG) | Power-Good Open-Drain Output | Asserts high after 1.5ms when output reaches 85% of target; requires external pull-up to VDD or ≤5.5V rail. |
| 3 (EN) | Enable Input | Active-high logic: device enabled when voltage exceeds 0.6V (60–140mV hysteresis); pulls down to GND disables regulator. |
| 4 (FB) | Feedback Input | Connects to resistor divider midpoint; senses output voltage against 0.8V reference for closed-loop regulation. |
| 5 (COMP) | Compensation Node | Internal error amplifier output; tie to AGND for internal compensation or add RC network to FB for custom loop shaping. |
| 6 (AGND) | Analog Ground | Return path for control circuitry; must be connected to PCB ground plane, not isolated from PGND. |
| 7,8 (PHASE) | Switch Node | Connects directly to output inductor; carries high di/dt switching current; layout critical for EMI and efficiency. |
| 9,10 (VIN) | Main Power Input | Supplies high-current path to internal FETs; requires local 10µF ceramic decoupling to PGND. |
| 11 (VDD) | LDO Decoupling Pin | Internally generated 5V supply; connect 1µF capacitor to ground; tie to VIN if VIN ≤5.5V to improve efficiency. |
| 12 (BOOT) | Bootstrap Supply | Floats above PHASE; connect 0.1µF capacitor between BOOT and PHASE to drive high-side gate. |
| 13 (PGND) | Power Ground | Source connection of low-side MOSFET and thermal pad; must be connected to PCB ground with multiple vias. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High/Low-Side FETs | 65mΩ/45mΩ rDS(ON) pair eliminates external MOSFET selection, gate drivers, and bootstrap diode. |
| Forced CCM Operation | Eliminates audible noise and output voltage ripple associated with DCM, ensuring consistent EMI behavior under all loads. |
| Programmable Soft-Start | SS pin enables controlled startup timing (2ms default, scalable via capacitor) to prevent inrush current and system brownouts. |
| Comprehensive Fault Protection | Includes positive/negative overcurrent, input/output overvoltage, thermal shutdown (165°C), and undervoltage lockout (4.2V rising). |
| Internal Compensation Support | COMP-to-AGND configuration simplifies design for most applications-no external compensation components required. |
Applications
| Industrial Process Control | Embedded Computing |
|---|---|
|
Use Scenario: Powering PLC I/O modules and sensor interface circuits operating from 12V or 24V DC rails. IC Role / Device Role / Timing Role: Point-of-load regulator converting 12V to 3.3V/1.8V for microcontrollers and ADCs. Use Value: ±1% regulation and thermal protection ensure reliable operation in unventilated enclosures across -40°C to +85°C ambient. |
Use Scenario: Supplying core voltage to ARM-based SoCs or FPGA I/O banks in edge AI gateways. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering 3A at 1.2V or 1.8V from 12V backplane. Use Value: Fixed 500kHz switching enables predictable filtering and meets EN55032 Class B conducted EMI limits. |
| Multifunction Printers | Network Equipment |
|
Use Scenario: Powering stepper motor drivers and imaging sensors requiring clean, stable low-voltage rails. IC Role / Device Role / Timing Role: Secondary regulator generating 5V/3.3V from main 12V supply for peripheral subsystems. Use Value: Integrated MOSFETs and internal compensation reduce BOM count by 6+ components versus controller-only solutions. |
Use Scenario: Providing regulated 5V or 3.3V to switch fabric controllers and PHY interfaces in PoE-powered switches. IC Role / Device Role / Timing Role: Load-point regulator on line card PCBs where space and thermal density are constrained. Use Value: 3mm×4mm DFN package with EPAD enables high-power density while maintaining <15°C junction rise at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315GJ-Z | 4.5–28V input, 3A, 500kHz, no soft-start pin; uses internal compensation only. | Lacks programmable soft-start; less suitable for systems requiring inrush control or sequencing. | Choose MP2315GJ-Z when board space is tighter (2mm×2mm QFN) and soft-start timing is not critical. |
| TPS54332DR | 3.5–28V input, 3A, adjustable 200–2500kHz, external compensation required; no integrated low-side FET. | Requires external low-side MOSFET and gate driver; higher BOM cost and layout complexity. | Choose TPS54332DR when variable frequency sync or ultra-low quiescent current (<100µA) is required. |
Compared with MP2315GJ-Z and TPS54332DR, the ISL85003AFRZ-TK offers a balanced trade-off: integrated FETs reduce component count, programmable soft-start enhances system robustness, and fixed 500kHz operation simplifies EMI filtering-making it ideal for cost-sensitive, space-constrained industrial and embedded designs.
Availability
ISL85003AFRZ-TK is available at Aetrix Electronics and suitable for industrial process control, embedded computing, and network equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL85003AFRZ-TK 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 ISL85003A belongs to Renesas' highly integrated buck regulator product line, designed specifically for compact, high-efficiency point-of-load conversion in space- and thermal-constrained embedded systems.
FAQ
What is the primary functional difference between ISL85003AFRZ-TK and ISL85003FRZ-TK?
The ISL85003AFRZ-TK replaces the SYNC pin of the ISL85003FRZ-TK with a dedicated SS (soft-start) pin and operates exclusively in forced continuous conduction mode (CCM) at 500kHz. In contrast, the ISL85003FRZ-TK supports external frequency synchronization (300kHz–2MHz) and automatic DCM/CCM mode switching. Both share identical 3A rating, 4.5V–18V input, and 0.8V feedback reference.
Does ISL85003AFRZ-TK support external compensation, and how is it configured?
Yes, ISL85003AFRZ-TK supports both internal and external compensation. For internal compensation, connect the COMP pin directly to AGND. For external compensation, place an RC network between COMP and FB-typically a series resistor and capacitor-to tailor loop bandwidth and phase margin for specific output capacitor ESR and inductance values.
What is the maximum recommended output capacitance for stable operation of ISL85003AFRZ-TK?
The ISL85003AFRZ-TK is validated for stable operation with up to 200µF total output capacitance using internal compensation. For designs exceeding 200µF (e.g., high-reliability hold-up or low-ripple applications), R1 in the feedback divider must be adjusted per the "Loop Compensation Design" section (page 19 of FN7968) to maintain ~40kHz loop bandwidth and avoid instability.
How does the ISL85003AFRZ-TK handle negative current conditions, and what is the trip threshold?
The ISL85003AFRZ-TK includes dedicated negative overcurrent protection that triggers when reverse current flows into the PHASE node (e.g., during output short-circuit or sudden load removal). The threshold is -1.1A to -3.2A (min/max), depending on temperature and operating conditions, with the high-side MOSFET held off to block reverse conduction.
Can ISL85003AFRZ-TK be used with an input voltage below 4.5V, such as 3.3V?
No. The absolute minimum input voltage for ISL85003AFRZ-TK is 4.5V, enforced by its internal UVLO circuit (rising threshold = 4.20–4.35V). Attempting to operate below this risks improper startup, unstable regulation, or failure to enable. For sub-4.5V inputs, consider Renesas' ISL8541x family or alternative buck regulators rated for 2.7V–5.5V operation.
ISL85003AFRZ-TK 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):
- 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)
ISL85003AFRZ-TK FAQ
1.How can I place an order for ISL85003AFRZ-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85003AFRZ-TK 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 ISL85003AFRZ-TK reliable?
The price and inventory of ISL85003AFRZ-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85003AFRZ-TK is usually 5 days.
3.What payment methods are accepted for ISL85003AFRZ-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85003AFRZ-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85003AFRZ-TK?
ISL85003AFRZ-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85003AFRZ-TK 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 ISL85003AFRZ-TK?
For technical support, including ISL85003AFRZ-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85003AFRZ-TK requirements.
6.How does Aetrix verify that ISL85003AFRZ-TK is sourced from the original manufacturer or authorized distributors?
All ISL85003AFRZ-TK 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 ISL85003AFRZ-TK meets industry standards.
7.What is the process for return or replacement of ISL85003AFRZ-TK?
All ISL85003AFRZ-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL85003AFRZ-TK, 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 ISL85003AFRZ-TK part is unused and in its original packaging.
Return procedure for ISL85003AFRZ-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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