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Renesas ISL85003AFRZ-T
- Part No.:
- ISL85003AFRZ-T
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85003AFRZ-T.pdf
- Description:
- IC REG BUCK ADJ 3A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,887
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Product details
Overview
ISL85003AFRZ-T 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. Used in point-of-load conversion for embedded computing and industrial 12V rail supplies.
For engineers reviewing the ISL85003AFRZ-T datasheet, ISL85003AFRZ-T pinout, ISL85003AFRZ-T application, or ISL85003AFRZ-T equivalent, key selection criteria include its fixed 500kHz CCM operation, programmable soft-start, open-drain power-good flag, internal 5V LDO biasing, and thermal/overvoltage/overcurrent protection architecture.
Technical Context
The ISL85003AFRZ-T implements a current-mode control architecture with internal slope compensation (550mV/µs at 500kHz), enabling stable loop response across wide VIN/VOUT ranges. Its error amplifier provides 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 ISL85003AFRZ-T replaces SYNC functionality with a dedicated SS pin for 4µA programmable soft-start charging, eliminating DCM operation and synchronization capability. Protection includes positive/negative overcurrent detection (5.0A / –2.2A thresholds), 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 industrial rails and wide-input battery systems without external pre-regulation. |
| Output Current | 3A continuous - sufficient for FPGA core rails, microcontroller SoCs, and ASIC point-of-load applications. |
| Switching Frequency | Fixed 500kHz - enables compact magnetics design while balancing efficiency and EMI performance. |
| Output Voltage Accuracy | ±1% over line/load/temperature - ensures reliable logic-level compliance for 1.2V, 1.8V, 3.3V, and 5V digital loads. |
| High-Side rDS(ON) | 65mΩ @ 100mA - minimizes conduction loss during high-duty-cycle operation (e.g., 5V→3.3V conversion). |
| Low-Side rDS(ON) | 45mΩ @ 100mA - reduces freewheeling losses and improves light-load efficiency in forced CCM. |
| Soft-Start Current | 3.5µA typical - allows precise timing control (e.g., 2ms default or extended via external capacitor) for inrush current limiting. |
| Power-Good Threshold | 85% of regulated VOUT with 3% hysteresis - provides robust system sequencing and fault indication with 1.5ms rise delay. |
Pinout & Package
ISL85003AFRZ-T uses a 12-lead 3mm × 4mm Dual Flat No-Lead (DFN) package with exposed thermal pad (PKG DWG L12.3x4), optimized for high-power density and thermal dissipation in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SS) | Soft-Start control | 4µA current source charges external capacitor to ramp output voltage; no capacitor yields fixed 2ms startup. |
| 2 (PG) | Power-good open-drain | Asserts high after VOUT reaches 85% of target with 1.5ms delay; requires external pull-up to ≤5.5V. |
| 3 (EN) | Enable input | Active-high logic; device enabled when voltage exceeds 0.6V (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 tying to AGND; external network enables 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 | Drives external inductor; connects directly to boot capacitor and low-side MOSFET source. |
| 9,10 (VIN) | Main power input | Accepts 4.5V–18V; requires local 10µF ceramic decoupling to PGND. |
| 11 (VDD) | LDO output | Internally generated 5V supply; decoupled with 1µF capacitor; tie to VIN if VIN ≤5.5V. |
| 12 (BOOT) | Bootstrap supply | 0.1µF capacitor between BOOT and PHASE powers high-side gate driver. |
| 13 (PGND) | Power ground | Thermal pad and low-side MOSFET source return; requires ≥8 vias to inner ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Forced CCM operation | Eliminates light-load frequency variation and associated EMI spread, ensuring predictable switching behavior across full load range. |
| Programmable soft-start | 4µA SS current source enables controlled output ramp-up to prevent inrush current damage to downstream capacitors and regulators. |
| Integrated 5V LDO | Derives internal bias from VIN, removing need for external bias supply and simplifying system power architecture. |
| Open-drain PG with window comparator | Monitors output within ±15% window and asserts after 1.5ms stabilization, enabling safe system power sequencing. |
| Lossless current sensing | Uses temperature-compensated rDS(ON) of internal MOSFETs for overcurrent protection-no sense resistor required. |
| Thermal shutdown with hysteresis | Shuts down at 165°C and restarts only after cooling to 155°C, preventing thermal cycling and ensuring safe recovery. |
Applications
| Industrial Process Control | Embedded Computing |
|---|---|
Use Scenario: Powering PLC I/O modules and sensor signal conditioning circuits in factory automation cabinets with 12V/24V DC bus. IC Role / Device Role / Timing Role: Point-of-load regulator converting 12V rail to 3.3V/1.8V for microcontrollers and ADCs. Use Value: ±1% regulation maintains ADC reference stability; 3A capacity supports multi-channel analog front-ends without derating. | Use Scenario: Supplying core voltage to ARM-based edge AI processors in fanless industrial gateways. IC Role / Device Role / Timing Role: Primary buck converter delivering 1.2V/3A to processor core with tight transient response. Use Value: Forced CCM ensures consistent 500kHz switching for predictable EMI filtering; thermal shutdown protects against enclosure overheating. |
| Multifunction Printers | Network Equipment |
Use Scenario: Generating 5V/3A for print engine motor drivers and image processing ASICs in compact MFP designs. IC Role / Device Role / Timing Role: High-efficiency buck stage replacing discrete controller + MOSFET solutions. Use Value: Integrated 65mΩ/45mΩ FETs achieve >92% efficiency at 2A, reducing board heat and eliminating external gate drivers. | Use Scenario: Providing 3.3V/3A to Ethernet PHYs and packet buffer memory in enterprise switches. IC Role / Device Role / Timing Role: Secondary regulator fed from 12V intermediate bus, with PG signaling for link-up sequencing. Use Value: Open-drain PG output synchronizes PHY initialization with stable 3.3V rail, preventing link negotiation failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL85003FRZ-T | Includes SYNC pin for external frequency synchronization (300kHz–2MHz); operates in auto DCM/CCM mode. | Preferred where EMI reduction via spread-spectrum sync or light-load efficiency optimization is required. | Select ISL85003FRZ-T if system clock sync or variable-frequency operation is needed; ISL85003AFRZ-T is optimal for fixed-frequency, noise-sensitive CCM-only designs. |
| MP2451DT-LF-Z | 3A buck with 4.5V–36V input, 500kHz fixed frequency, but lacks programmable soft-start and PG output. | Suitable for cost-sensitive industrial supplies where sequencing and startup control are secondary. | Choose MP2451DT-LF-Z for wider input range and lower BOM count; ISL85003AFRZ-T offers superior protection integration and precision regulation. |
Compared with ISL85003FRZ-T and MP2451DT-LF-Z, the ISL85003AFRZ-T delivers tighter output accuracy (±1% vs ±2%), integrated PG signaling, and dedicated soft-start control-making it ideal for systems requiring deterministic power-up behavior and robust fault handling without external components.
Availability
ISL85003AFRZ-T is available at Aetrix Electronics and suitable for industrial process control, embedded computing, multifunction printers, and network equipment requiring stable component supply and long-term production continuity.
Supply support for ISL85003AFRZ-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 specializing in microcontrollers, analog power management, and timing solutions for industrial, automotive, and infrastructure markets.
The ISL85003A belongs to Renesas' highly integrated synchronous 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 maximum output current capability of the ISL85003AFRZ-T?
The ISL85003AFRZ-T delivers up to 3A continuous output current under recommended operating conditions (VIN = 4.5V–18V, TJ ≤ +125°C). This rating assumes proper PCB layout with ≥8 thermal vias to the ground plane and adequate airflow or heatsinking. Peak current capability is limited to 5A by internal positive overcurrent protection.
Does the ISL85003AFRZ-T support external frequency synchronization?
No, the ISL85003AFRZ-T does not support external frequency synchronization. Pin 1 is designated as SS (soft-start), not SYNC. For sync capability, use the ISL85003FRZ-T variant, which features a dedicated SYNC pin enabling synchronization from 300kHz to 2MHz.
How is the output voltage set on the ISL85003AFRZ-T?
The output voltage of the ISL85003AFRZ-T is set using an external resistor divider connected between VOUT, FB, and AGND. The internal 0.8V reference is compared to the FB node voltage, so VOUT = 0.8V × (1 + R1/R2). Table 1 in the datasheet provides standard resistor values for common outputs including 1.2V, 1.8V, 3.3V, and 5V.
What protection features are integrated into the ISL85003AFRZ-T?
The ISL85003AFRZ-T integrates positive and negative overcurrent protection (5.0A and –2.2A thresholds), input overvoltage lockout (20V), output overvoltage detection, thermal shutdown at 165°C with 10°C hysteresis, and undervoltage lockout on VIN (4.35V rising threshold). All protections are fully autonomous and require no external components.
Can the ISL85003AFRZ-T operate with an input voltage below 4.5V?
No, the ISL85003AFRZ-T has a minimum specified input voltage of 4.5V due to internal UVLO (undervoltage lockout) activation at 4.20V (rising edge). Operation below this threshold is not guaranteed, and the device will remain disabled until VIN rises above 4.35V. For sub-4.5V applications, consider alternative regulators such as the ISL85415 series.
ISL85003AFRZ-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):
- 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-T FAQ
1.How can I place an order for ISL85003AFRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85003AFRZ-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 ISL85003AFRZ-T reliable?
The price and inventory of ISL85003AFRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85003AFRZ-T is usually 5 days.
3.What payment methods are accepted for ISL85003AFRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85003AFRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85003AFRZ-T?
ISL85003AFRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85003AFRZ-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 ISL85003AFRZ-T?
For technical support, including ISL85003AFRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85003AFRZ-T requirements.
6.How does Aetrix verify that ISL85003AFRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL85003AFRZ-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 ISL85003AFRZ-T meets industry standards.
7.What is the process for return or replacement of ISL85003AFRZ-T?
All ISL85003AFRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL85003AFRZ-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 ISL85003AFRZ-T part is unused and in its original packaging.
Return procedure for ISL85003AFRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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