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Renesas ISL85003FRZ-TK
- Part No.:
- ISL85003FRZ-TK
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85003FRZ-TK.pdf
- Description:
- IC REG BUCK ADJ 3A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,940
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Product details
Overview
ISL85003FRZ-TK 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 features automatic DCM/CCM mode switching, 500kHz fixed-frequency operation, and internal compensation - ideal for point-of-load conversion in industrial and embedded computing systems.
For engineers reviewing the ISL85003FRZ-TK datasheet, ISL85003FRZ-TK pinout, ISL85003FRZ-TK application, or ISL85003FRZ-TK equivalent, key selection considerations include its 3mm×4mm DFN package, SYNC-controlled mode selection, open-drain PG window comparator, integrated boot diode with undervoltage detection, and thermal/overvoltage/overcurrent protection architecture.
Technical Context
The ISL85003FRZ-TK implements current-mode control with slope compensation (550mV/µs at 500kHz), enabling stable loop response across wide VIN/VOUT ranges. Its dual-MOSFET topology uses temperature-compensated RDS(ON)-based current sensing for lossless overcurrent protection.
Mode behavior is determined by the SYNC pin: pulled low for DCM, high for forced CCM, or driven externally for synchronization from 300kHz to 2MHz. The device includes an internal 5V LDO (VDD), 0.8V reference with ±8mV tolerance, and programmable soft-start via external capacitor on the SS pin (default 2ms).
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 core, microprocessor I/O, or ASIC power domains. |
| Output Voltage Accuracy | ±1% over line/load/temperature - ensures reliable logic-level compliance for 1.2V–3.3V digital loads. |
| Switching Frequency | 500kHz (fixed) - balances efficiency, size, and EMI; externally synchronizable up to 2MHz on ISL85003 variant. |
| High-Side rDS(ON) | 65mΩ @ 100mA - minimizes conduction loss at mid-to-high load, contributing to >95% peak efficiency. |
| Low-Side rDS(ON) | 45mΩ @ 100mA - reduces freewheeling loss and improves light-load DCM efficiency. |
| Protection Features | Positive/negative OCP, input/output OVP, thermal shutdown (165°C), and PG window comparator - enables robust self-protected operation without external supervision circuitry. |
Pinout & Package
ISL85003FRZ-TK is housed in a thermally enhanced 12-lead 3mm×4mm Dual Flat No-Lead (DFN) package with exposed thermal pad (PGND). The package supports high-current routing and efficient heat dissipation via board-level vias to internal ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC (Pin 1) | Mode selection & sync input | Configures DCM/CCM operation or accepts external clock (300kHz–2MHz); internal 1MΩ pull-up prevents floating state. |
| PG (Pin 2) | Power-good open-drain output | Signals valid regulation (85–120% of target) with 1.5ms delay; requires external pull-up to VDD or ≤5.5V rail. |
| EN (Pin 3) | Enable control input | Active-high enable with 0.6V threshold and 100mV hysteresis; disables regulator and reduces quiescent current to 6µA. |
| FB (Pin 4) | Feedback node | Connects to resistor divider; sets output voltage via 0.8V reference; leakage <10nA preserves accuracy. |
| COMP (Pin 5) | Compensation node | Internal compensation selected by shorting to AGND; external network between COMP and FB enables custom loop tuning. |
| AGND (Pin 6) | Analog ground reference | Return path for error amplifier and control circuitry; must be connected to PCB ground plane, not isolated from PGND. |
| PHASE (Pins 7, 8) | Switch node | Drives external output inductor; connects directly to drain of high-side FET and source of low-side FET. |
| VIN (Pins 9, 10) | Main power input | Accepts 4.5–18V supply; requires local 10µF ceramic decoupling to PGND near pins. |
| VDD (Pin 11) | Internal LDO output | 5V regulated supply for control blocks; connect 1µF capacitor to ground; tie to VIN if VIN = 4.5–5.5V for efficiency gain. |
| BOOT (Pin 12) | Bootstrap supply | Floating gate drive supply for high-side FET; requires 0.1µF capacitor between BOOT and PHASE. |
| PGND (Pin 13 / EPAD) | Power ground & thermal pad | Source connection for low-side FET and primary thermal path; must be connected to PCB ground plane using ≥8 vias. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-NFET power stage | Eliminates external MOSFET selection and layout complexity; 65mΩ/45mΩ RDS(ON) enables high-efficiency 3A delivery in compact footprint. |
| Automatic DCM/CCM transition | Maintains high light-load efficiency without manual mode configuration; seamless crossover avoids output voltage disturbance. |
| Internal 5V LDO (VDD) | Reduces system BOM count by powering internal analog/digital blocks; improves efficiency when VIN ≤5.5V via direct connection. |
| Open-drain PG with window comparator | Provides precise power sequencing feedback (80–120% window) with 3% hysteresis, enabling reliable system reset and monitoring. |
| Lossless current limit sensing | Derives current measurement from MOSFET RDS(ON) with temperature compensation - no sense resistor required, preserving efficiency and layout space. |
Applications
| Industrial Process Control | Embedded Computing |
|---|---|
Use Scenario: Powering PLC I/O modules, sensor signal conditioners, and fieldbus interface ICs in factory automation cabinets. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 12V/24V backplane to 3.3V/1.8V for microcontrollers and ADCs. Use Value: ±1% regulation and thermal shutdown ensure long-term reliability under variable ambient temperatures and load transients. | Use Scenario: Supplying core voltage to ARM-based SoCs and DDR memory in edge AI gateways and ruggedized compute modules. IC Role / Device Role / Timing Role: High-current buck converter delivering stable 0.8V–1.2V to processor cores with fast transient response. Use Value: 3A capability and 500kHz switching enable compact filter design while maintaining >92% efficiency at full load. |
| Network Equipment | Point-of-Load Regulation |
Use Scenario: Providing 5V/3.3V rails to Ethernet PHYs, packet processors, and optical transceiver modules in switches and routers. IC Role / Device Role / Timing Role: Secondary regulator downstream of intermediate 12V bus, supporting hot-swap and sequencing requirements. Use Value: PG output and input overvoltage protection (20V threshold) safeguard against bus faults and inrush events. | Use Scenario: Local regulation for FPGA I/O banks, PCIe SerDes, or GPU auxiliary rails where centralized DC/DC is impractical. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator minimizing PCB area and component count per rail. Use Value: 3mm×4mm DFN package with integrated FETs reduces solution size by >40% versus controller+external MOSFET designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL85003AFRZ-TK | Replaces SYNC pin with SS (soft-start) pin; fixed 500kHz operation only; no external sync capability. | Suitable for applications requiring controlled startup ramp but no frequency synchronization or DCM mode. | Select ISL85003AFRZ-TK when soft-start timing must be programmable and DCM operation is unnecessary. |
| MP2333HG-5-LF-P | Monolithic 3A buck with 4.5–28V input, 500kHz fixed freq, but lacks SYNC pin and DCM mode; higher RDS(ON) (80mΩ/50mΩ). | Better suited for higher-input-voltage industrial sensors; less optimal for noise-sensitive synchronized systems. | Choose MP2333HG-5-LF-P when input exceeds 18V or when Renesas-specific features like DCM/CCM auto-transition are not required. |
Compared with ISL85003AFRZ-TK, the ISL85003FRZ-TK offers external frequency synchronization and automatic light-load DCM mode - critical for EMI-controlled or battery-powered systems. Versus MP2333HG-5-LF-P, it provides tighter output accuracy (±1% vs ±2%), lower RDS(ON), and integrated SYNC functionality for multi-rail coherence.
Availability
ISL85003FRZ-TK is available at Aetrix Electronics and suitable for industrial process control, embedded computing, and network equipment requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.
Supply support for ISL85003FRZ-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 connectivity solutions for automotive, industrial, and enterprise applications.
The ISL85003FRZ-TK belongs to Renesas' high-efficiency monolithic buck regulator product line, designed specifically for space-constrained, high-reliability point-of-load applications demanding integrated power stages and comprehensive protection.
FAQ
What is the recommended input capacitor for ISL85003FRZ-TK?
A 10µF ceramic capacitor placed close to the VIN and PGND pins is recommended per the datasheet. This value ensures effective high-frequency decoupling and stability across the 4.5V–18V input range. For systems with high ripple current or long input traces, adding a bulk electrolytic or polymer capacitor (e.g., 47–100µF) in parallel improves hold-up and transient response. The ISL85003FRZ-TK's internal current sensing and loop compensation are optimized for this standard input capacitance.
Does ISL85003FRZ-TK support prebiased output startup?
Yes, the ISL85003FRZ-TK supports prebiased output startup. When enabled, the device safely ramps the output from a nonzero initial voltage without forcing reverse current through the output capacitor or causing output overshoot. This feature is essential in systems with multiple power rails that may power up asynchronously, such as FPGA or SoC platforms where core and I/O supplies sequence independently. Prebias operation is enabled by default and requires no external configuration.
How does the SYNC pin function on ISL85003FRZ-TK?
On the ISL85003FRZ-TK, the SYNC pin serves three distinct functions: pulling it low selects DCM mode, pulling it high forces CCM mode, and driving it with an external clock (300kHz–2MHz, positive-edge triggered) synchronizes switching. An internal 1MΩ pull-up ensures defined logic state if left unconnected. This flexibility allows designers to optimize efficiency (DCM), noise immunity (synchronized CCM), or transient response (forced CCM) without changing hardware - all within the same ISL85003FRZ-TK footprint.
What is the thermal performance of ISL85003FRZ-TK in its DFN package?
The ISL85003FRZ-TK in its 3mm×4mm DFN package has a junction-to-case thermal resistance (θJC) of 5°C/W and junction-to-ambient (θJA) of 49°C/W under standard test conditions. With proper PCB layout - including ≥8 thermal vias connecting the exposed PGND pad to inner ground planes - the device sustains continuous 3A output at ambient temperatures up to +85°C without derating. Thermal shutdown activates at 165°C with 10°C hysteresis, providing robust protection during overload or airflow-limited conditions.
Can ISL85003FRZ-TK be used with external compensation?
Yes, ISL85003FRZ-TK supports both internal and external compensation. Internal compensation is selected by connecting the COMP pin directly to AGND - simplifying design for most applications. External compensation is enabled by inserting a Type II or Type III network between COMP and FB, allowing fine-tuning of loop bandwidth, phase margin, and transient response for demanding loads (e.g., high-capacitance FPGA rails or fast-dynamic processors). The datasheet provides design equations and example values for common output configurations.
ISL85003FRZ-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)
ISL85003FRZ-TK FAQ
1.How can I place an order for ISL85003FRZ-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85003FRZ-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 ISL85003FRZ-TK reliable?
The price and inventory of ISL85003FRZ-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85003FRZ-TK is usually 5 days.
3.What payment methods are accepted for ISL85003FRZ-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85003FRZ-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85003FRZ-TK?
ISL85003FRZ-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85003FRZ-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 ISL85003FRZ-TK?
For technical support, including ISL85003FRZ-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85003FRZ-TK requirements.
6.How does Aetrix verify that ISL85003FRZ-TK is sourced from the original manufacturer or authorized distributors?
All ISL85003FRZ-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 ISL85003FRZ-TK meets industry standards.
7.What is the process for return or replacement of ISL85003FRZ-TK?
All ISL85003FRZ-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL85003FRZ-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 ISL85003FRZ-TK part is unused and in its original packaging.
Return procedure for ISL85003FRZ-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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