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Renesas ISL85003AFRZ-T7A
- Part No.:
- ISL85003AFRZ-T7A
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85003AFRZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 3A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:424
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Product details
Overview
ISL85003AFRZ-T7A 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 500kHz, supports adjustable soft-start, and achieves ±1% output voltage regulation down to 0.8V - ideal for point-of-load power in industrial embedded systems.
For engineers reviewing the ISL85003AFRZ-T7A datasheet, ISL85003AFRZ-T7A pinout, ISL85003AFRZ-T7A application, or ISL85003AFRZ-T7A equivalent, key selection criteria include its fixed 500kHz switching frequency, programmable soft-start via SS pin, internal compensation capability, and thermal shutdown at 165°C - all validated for stable operation across –40°C to +125°C junction temperature.
Technical Context
The ISL85003AFRZ-T7A implements a current-mode control architecture with integrated slope compensation (550 mV/µs at 500kHz), enabling stable loop response without external compensation in most applications. Its error amplifier features 5.5MHz open-loop bandwidth and 70dB gain, supporting tight regulation under dynamic load transients.
Unlike the ISL85003 variant, the ISL85003A disables DCM operation and replaces SYNC functionality with a dedicated soft-start (SS) pin, where a 4µA internal current source charges an external capacitor to control ramp time - defaulting to 2ms with no capacitor. Protection includes positive/negative overcurrent detection, input/output overvoltage lockout, and thermal shutdown with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports standard 12V rail and wide-input industrial supplies without pre-regulation. |
| Output Current | Continuous 3A - sufficient for FPGA core rails, microcontroller SoCs, and ASIC point-of-load applications. |
| Switching Frequency | Fixed 500kHz - enables compact magnetics and predictable EMI filtering without external sync circuitry. |
| Output Voltage Accuracy | ±1% over line/load/temperature - ensures reliable logic-level compliance for 1.2V, 1.8V, 3.3V, and 5V domains. |
| 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 loss and improves light-load efficiency in forced CCM. |
| Soft-Start Control | Programmable via SS pin with 3.5µA typical charging current - prevents inrush current into large output capacitors. |
| Thermal Shutdown | 165°C trip with 10°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
ISL85003AFRZ-T7A 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 designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SS) | Soft-Start control input | Internal 3.5µA current source ramps voltage to control output rise time; no capacitor yields 2ms default. |
| 2 (PG) | Power-good open-drain output | Asserts high after 1.5ms when VOUT reaches 85% of target; requires external pull-up to ≤5.5V. |
| 3 (EN) | Enable input | Active-high enable with 0.6V threshold and 100mV hysteresis; pulls device into shutdown below 0.5V. |
| 4 (FB) | Feedback node | Connects to resistor divider; regulates output to 0.8V reference with ±8mV tolerance over temperature. |
| 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 control circuitry; must be tied to PGND on PCB but kept separate from noisy power planes. |
| 7,8 (PHASE) | Switch node | Drives external inductor; connects directly to both MOSFET sources/drains - requires low-inductance layout. |
| 9,10 (VIN) | Main power input | Accepts 4.5V–18V; decoupled with ≥10µF ceramic cap placed near pins 9/10 to PGND. |
| 11 (VDD) | Internal LDO output | 5V regulated supply for gate drivers and analog blocks; bypassed with 1µF to AGND. |
| 12 (BOOT) | Bootstrap supply | Connected to PHASE via 0.1µF capacitor; enables high-side MOSFET drive above VIN rail. |
| 13 (PGND) | Power ground / thermal pad | Source connection for low-side FET and primary thermal path; requires ≥8 vias to inner ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 65mΩ/45mΩ high/low-side MOSFETs eliminate external discrete switches and reduce BOM count. |
| Forced CCM Operation | Eliminates audible noise and output ripple variation associated with DCM, ensuring consistent EMI profile. |
| Programmable Soft-Start | SS pin allows precise control of inrush current - critical for systems powering multiple rails simultaneously. |
| Robust Fault Protection | Includes positive/negative OCP, input/output OVP, UVLO (4.35V rising), and thermal shutdown with hysteresis. |
| Internal Compensation | Reduces design complexity: connect COMP to AGND for stable operation without external RC network. |
| Power-Good Monitoring | Open-drain PG provides system-level sequencing feedback with 1.5ms delay and 3% hysteresis window. |
Applications
| Industrial Process Controllers | Network Equipment Power Rails |
|---|---|
|
Use Scenario: Regulating 3.3V or 5V for PLC I/O modules operating in harsh environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 12V backplane to logic-supply voltages with ±1% accuracy. Use Value: High thermal robustness (125°C max junction) and integrated protection ensure uptime in unventilated enclosures. |
Use Scenario: Supplying 1.2V core voltage to Ethernet switch ASICs requiring clean, low-noise power under dynamic traffic loads. IC Role / Device Role / Timing Role: Synchronous buck converter delivering 3A at fixed 500kHz to minimize filter component size. Use Value: Forced CCM eliminates subharmonic oscillation and ensures predictable transient response during packet bursts. |
| Multifunction Printer Logic Boards | Embedded Computing Modules |
|
Use Scenario: Powering ARM-based print controller SoCs with variable load profiles during scan, process, and print phases. IC Role / Device Role / Timing Role: Adjustable-output buck regulator (0.8V–5V) with soft-start to prevent brownout during cold boot. Use Value: Programmable SS pin enables coordinated startup with other rails, avoiding current surges that trip upstream fuses. |
Use Scenario: Providing 1.8V I/O supply for DDR3 memory interfaces in fanless edge-computing gateways. IC Role / Device Role / Timing Role: Compact 3mm×4mm DFN regulator supporting high-density layout with minimal thermal footprint. Use Value: Exposed thermal pad and low rDS(ON) values maintain <125°C junction temp even at full 3A load in sealed chassis. |
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-T7A | Features SYNC pin for external frequency synchronization (300kHz–2MHz); operates in auto DCM/CCM mode. | Suitable for noise-sensitive systems requiring spread-spectrum sync or ultra-light-load efficiency. | Select ISL85003FRZ-T7A if frequency coordination with other converters or DCM operation is required. |
| MP2451DT-LF-Z | 3A buck with 4.5V–36V input, 500kHz fixed freq, but lacks programmable soft-start and has ±2% FB tolerance. | Better suited for automotive 24V systems; less precise regulation and no SS control limits use in precision logic rails. | Choose MP2451DT-LF-Z only for cost-sensitive 24V industrial applications where ±2% accuracy is acceptable. |
Compared with ISL85003FRZ-T7A, the ISL85003AFRZ-T7A trades sync flexibility for deterministic soft-start control; versus MP2451DT-LF-Z, it delivers tighter regulation, integrated thermal protection, and superior light-load stability in forced CCM - critical for embedded computing.
Availability
ISL85003AFRZ-T7A is available at Aetrix Electronics and suitable for industrial process controllers, network equipment power rails, and embedded computing modules requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.
Supply support for ISL85003AFRZ-T7A 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 space-constrained, thermally demanding point-of-load applications requiring high efficiency, robust protection, and simplified design-in.
FAQ
What is the maximum output current capability of the ISL85003AFRZ-T7A?
The ISL85003AFRZ-T7A delivers up to 3A continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). Peak current capability is limited by overcurrent protection at 5.0A typical, but sustained operation beyond 3A requires derating based on ambient temperature and copper area.
Does the ISL85003AFRZ-T7A support external frequency synchronization?
No, the ISL85003AFRZ-T7A does not support external frequency synchronization. Pin 1 is designated as SS (soft-start), not SYNC. For sync capability, use the ISL85003FRZ-T7A variant, which dedicates pin 1 to synchronization and supports 300kHz–2MHz external clock input.
How is the output voltage set on the ISL85003AFRZ-T7A?
The output voltage is set using a resistor divider from VOUT to AGND, with the midpoint connected to the FB pin. The internal 0.8V reference determines regulation: VOUT = 0.8V × (1 + R1/R2). For example, 3.3V output requires R1 = 301kΩ and R2 = 57.1kΩ per the datasheet's component table.
What thermal considerations apply to the ISL85003AFRZ-T7A in a 3A application?
At 3A load and 12V input, the ISL85003AFRZ-T7A dissipates ~0.6W typical. To maintain TJ ≤ 125°C, the PCB must provide adequate thermal relief: connect the exposed PGND pad to a solid inner ground plane using ≥8 thermal vias, and ensure ≥1 in² of 2oz copper pour beneath the DFN package.
Can the ISL85003AFRZ-T7A operate with an input voltage below 4.5V?
No - the absolute minimum input voltage is 4.5V per the Recommended Operating Conditions. Below this, the internal VDD LDO cannot sustain regulation, and UVLO (4.35V rising threshold) will disable the device. For sub-4.5V inputs, consider Renesas' ISL8541x family or alternative low-VIN buck regulators.
ISL85003AFRZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-T7A FAQ
1.How can I place an order for ISL85003AFRZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85003AFRZ-T7A 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-T7A reliable?
The price and inventory of ISL85003AFRZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85003AFRZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL85003AFRZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85003AFRZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85003AFRZ-T7A?
ISL85003AFRZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85003AFRZ-T7A 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-T7A?
For technical support, including ISL85003AFRZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85003AFRZ-T7A requirements.
6.How does Aetrix verify that ISL85003AFRZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL85003AFRZ-T7A 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-T7A meets industry standards.
7.What is the process for return or replacement of ISL85003AFRZ-T7A?
All ISL85003AFRZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL85003AFRZ-T7A, 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-T7A part is unused and in its original packaging.
Return procedure for ISL85003AFRZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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