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Renesas ISL85003AFRZ
- Part No.:
- ISL85003AFRZ
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85003AFRZ.pdf
- Description:
- IC REG BUCK ADJ 3A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,666
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Product details
Overview
ISL85003AFRZ from Renesas Electronics is a synchronous buck DC-DC regulator with integrated 65mΩ high-side and 45mΩ low-side N-channel MOSFETs, delivering up to 3A continuous output current from a 4.5V–18V input. It operates in forced continuous conduction mode (CCM) at a fixed 500kHz switching frequency, supports adjustable output down to 0.8V ±1%, and includes programmable soft-start, power-good monitoring, and comprehensive fault protection for point-of-load applications in industrial and embedded systems.
For engineers reviewing the ISL85003AFRZ datasheet, ISL85003AFRZ pinout, ISL85003AFRZ application, or ISL85003AFRZ equivalent, this page delivers verified electrical specifications, validated package mapping, confirmed pin functions, real-world thermal and efficiency behavior, and two rigorously cross-checked alternative parts for design continuity.
Technical Context
The ISL85003AFRZ implements a current-mode control architecture with internal compensation and fixed 500kHz oscillator-no external sync capability. Its forced CCM operation eliminates light-load discontinuity, ensuring stable loop dynamics across full load range without DCM/CCM transition artifacts.
Protection is implemented via lossless current sensing using MOSFET rDS(ON) voltage drop, combined with dedicated circuits for input overvoltage (20V threshold), output overvoltage, negative current detection (−2.2A typical), 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 - sustained delivery under thermal limits with proper PCB layout (8 vias to PGND). |
| Output Voltage Accuracy | ±1% over line/load/temperature - ensures tight regulation for sensitive digital loads like FPGAs and microcontrollers. |
| Switching Frequency | Fixed 500kHz - enables predictable EMI filtering and compact magnetics (e.g., 4.7µH inductor for 5V out). |
| Soft-Start Time | Default 2ms, programmable via SS pin capacitor - prevents inrush current and output overshoot during power-up. |
| Efficiency Peak | Up to 95% at mid-load - achieved via low rDS(ON) FETs (65mΩ/45mΩ) and optimized gate drive. |
| Thermal Shutdown | 165°C with 10°C hysteresis - protects against sustained overload or poor heatsinking without latch-off. |
Pinout & Package
ISL85003AFRZ is housed in a thermally enhanced 12-lead 3mm × 4mm Dual Flat No-Lead (DFN) package with exposed thermal pad (EPAD = Pin 13/PGND). The package supports high-power density designs and requires direct connection of the EPAD to the PCB ground plane using ≥8 vias for effective thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SS) | Soft-Start control | 4µA internal current source charges external capacitor; sets ramp time for controlled VOUT rise. |
| 2 (PG) | Power-good open-drain | Asserts high after 1.5ms when VOUT reaches 85% of target; requires external pull-up to ≤5.5V. |
| 3 (EN) | Enable input | Active-high logic; device enabled above 0.6V threshold with 100mV hysteresis. |
| 4 (FB) | Feedback node | Connects to resistor divider; regulates output to 0.8V reference with ±1% tolerance. |
| 5 (COMP) | Compensation node | Internal compensation selected by shorting to AGND; external network optional for custom loop tuning. |
| 6 (AGND) | Analog ground | Reference for error amplifier and control circuitry; must tie to same ground plane as PGND. |
| 7,8 (PHASE) | Switch node | High-current path between internal FETs and external inductor; critical for EMI and layout integrity. |
| 9,10 (VIN) | Main power input | Accepts 4.5V–18V; requires local 10µF ceramic decoupling to PGND near pins. |
| 11 (VDD) | LDO output | Internally generated 5V supply; bypass with 1µF capacitor; connect directly to VIN if VIN ≤5.5V. |
| 12 (BOOT) | Bootstrap supply | Drives high-side gate; requires 0.1µF ceramic capacitor between BOOT and PHASE. |
| 13 (PGND) | Power ground / EPAD | Source connection for low-side FET and primary thermal path; must be soldered to large copper area with ≥8 vias. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 65mΩ/45mΩ high-/low-side FETs eliminate external MOSFET selection and layout complexity. |
| Forced CCM Operation | Guarantees fixed-frequency behavior and consistent loop stability across entire 0–3A load range. |
| Programmable Soft-Start | SS pin enables precise inrush control-critical for multi-rail sequencing and avoiding brown-out on shared supplies. |
| Lossless Overcurrent Protection | Uses MOSFET rDS(ON) sensing-no sense resistor needed, preserving efficiency and board space. |
| Robust Fault Coverage | Detects positive/negative overcurrent, input/output overvoltage, and thermal overload with automatic recovery. |
Applications
| Industrial PLC I/O Module | Network Switch ASIC Core Supply |
|---|---|
|
Use Scenario: Providing clean, regulated 1.2V/3A core voltage to FPGA-based I/O processing units in harsh factory environments. IC Role / Device Role / Timing Role: Primary point-of-load regulator with programmable soft-start to coordinate with system reset sequencing. Use Value: ±1% output accuracy maintains FPGA timing margins; forced CCM avoids audible noise and ensures deterministic transient response. |
Use Scenario: Delivering stable 3.3V/3A to Ethernet PHY and packet buffer ICs in 1U rack-mounted switches. IC Role / Device Role / Timing Role: High-efficiency buck converter with PG signal used for system power-good assertion before link initialization. Use Value: 95% peak efficiency reduces thermal load in dense chassis; 500kHz switching allows small 4.7µH inductor and <1000µF total output capacitance. |
| Multifunction Printer Engine Controller | Embedded Computing SoC Rail |
|
Use Scenario: Generating 5V/3A for motor driver ICs and image sensor interfaces during high-duty-cycle print jobs. IC Role / Device Role / Timing Role: Main DC-DC stage with thermal shutdown protecting against paper jam-induced overheating. Use Value: Integrated 165°C thermal cutoff prevents damage during stalled-motor conditions; PG signal disables motors if VOUT drops. |
Use Scenario: Supplying 1.8V/3A to ARM-based SoC cores in medical diagnostic handheld devices. IC Role / Device Role / Timing Role: Compact, low-noise power rail with pre-bias start-up support for battery-backed retention memory. Use Value: 3mm×4mm DFN footprint saves space in size-constrained enclosures; ±1% regulation ensures SoC clock stability. |
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 | 36V max input, 2A output, 340kHz fixed frequency, no soft-start programming, lower integration (external bootstrap diode required). | Suitable for higher-input industrial sensors but lacks programmable soft-start and 3A capability. | Choose when input exceeds 18V or cost sensitivity outweighs soft-start flexibility and current headroom. |
| TPS54332DR | 28V max input, 3A output, 600kHz fixed frequency, integrated soft-start (non-programmable), no PG pin. | Compatible for 3A PoL use but missing power-good signaling and adjustable soft-start timing. | Prefer when PG assertion is unnecessary and fixed 2ms soft-start suffices; verify thermal performance with same PCB layout. |
Compared with MP2451DT-LF-Z and TPS54332DR, ISL85003AFRZ uniquely combines 3A capability, programmable soft-start, open-drain PG, and 4.5–18V input in a 3×4mm DFN-enabling smaller BOM count, tighter sequencing control, and simpler validation for space-constrained industrial and networking designs.
Availability
ISL85003AFRZ is available at Aetrix Electronics and suitable for industrial process control, network infrastructure equipment, and embedded computing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL85003AFRZ 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, and connectivity solutions for automotive, industrial, and enterprise markets.
The ISL85003AFRZ belongs to Renesas' high-efficiency integrated power stage product line, designed specifically for compact, high-reliability point-of-load regulation in space- and thermal-constrained embedded systems.
FAQ
What is the maximum continuous output current of the ISL85003AFRZ?
The ISL85003AFRZ delivers up to 3A continuous output current under recommended operating conditions (TA ≤ +85°C, proper PCB thermal design with ≥8 vias to PGND). Derating applies above +85°C ambient per thermal resistance data (θJA = 49°C/W); at +125°C junction, output current is limited to ~1.8A to maintain safe thermal margin. ISL85003AFRZ achieves this with integrated 65mΩ/45mΩ MOSFETs and forced CCM operation.
Does the ISL85003AFRZ support external frequency synchronization?
No, the ISL85003AFRZ does not support external frequency synchronization. Unlike the ISL85003 variant (which uses Pin 1 as SYNC), the ISL85003AFRZ repurposes Pin 1 as SS (soft-start) and operates at a fixed 500kHz switching frequency. This is confirmed in Table 2 of the FN7968 datasheet, which explicitly states "No" for external sync capability in the ISL85003A row. ISL85003AFRZ relies on internal oscillator stability for EMI control.
How is the soft-start time programmed on the ISL85003AFRZ?
The ISL85003AFRZ soft-start time is programmed by connecting an external capacitor between the SS pin (Pin 1) and AGND. The internal 4µA current source charges this capacitor linearly; default time is 2ms with no capacitor. For longer ramps, use CSS (nF) = 4.1 × tSS (ms) − 1.6 nF (e.g., 22nF yields ~6.5ms). This feature is exclusive to ISL85003AFRZ and enables precise inrush control in multi-rail systems.
What protection features are built into the ISL85003AFRZ?
The ISL85003AFRZ integrates positive/negative overcurrent protection (4.0–6.0A / −1.1 to −3.2A), input overvoltage lockout (20V threshold), output overvoltage detection, thermal shutdown (165°C with 10°C hysteresis), and BOOT undervoltage detection. All protections auto-recover after fault removal-no latch-off or manual reset required. These are confirmed in Sections 7 and 16 of FN7968 Rev.3.02, and apply directly to ISL85003AFRZ.
Can the ISL85003AFRZ operate with a pre-biased output?
Yes, the ISL85003AFRZ supports pre-biased output startup. When enabled, the controller monitors the FB pin and delays high-side FET turn-on until the output voltage falls below the regulation threshold, preventing reverse current flow into a pre-charged rail. This behavior is documented in the "Enable, Soft-Start and Disable" section (page 16) of FN7968 and is inherent to the ISL85003A architecture-ensuring safe power sequencing in complex multi-supply systems containing ISL85003AFRZ.
ISL85003AFRZ 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)
ISL85003AFRZ FAQ
1.How can I place an order for ISL85003AFRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85003AFRZ 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 reliable?
The price and inventory of ISL85003AFRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85003AFRZ is usually 5 days.
3.What payment methods are accepted for ISL85003AFRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85003AFRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85003AFRZ?
ISL85003AFRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85003AFRZ 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?
For technical support, including ISL85003AFRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85003AFRZ requirements.
6.How does Aetrix verify that ISL85003AFRZ is sourced from the original manufacturer or authorized distributors?
All ISL85003AFRZ 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 meets industry standards.
7.What is the process for return or replacement of ISL85003AFRZ?
All ISL85003AFRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL85003AFRZ, 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 part is unused and in its original packaging.
Return procedure for ISL85003AFRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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