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Renesas ISL85005AFRZ-T
- Part No.:
- ISL85005AFRZ-T
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85005AFRZ-T.pdf
- Description:
- IC REG BUCK ADJ 5A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,356
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Product details
Overview
ISL85005AFRZ-T from Renesas Electronics is a monolithic synchronous buck regulator with integrated 5A/18V high-side and low-side MOSFETs, fixed 500kHz switching frequency, programmable soft-start via SS pin, forced CCM operation only, and ±1% 0.8V feedback reference-designed for point-of-load conversion in embedded computing and battery-powered systems requiring stable 5A output from 4.5V–18V inputs.
For engineers reviewing the ISL85005AFRZ-T datasheet, ISL85005AFRZ-T pinout, ISL85005AFRZ-T application, or ISL85005AFRZ-T equivalent, key selection criteria include its fixed-frequency current-mode control, internal 5V LDO (VDD), integrated bootstrap diode with undervoltage detection, thermal shutdown, and comprehensive overcurrent protections (high-side cycle-by-cycle, low-side forward/reverse).
Technical Context
The ISL85005AFRZ-T implements current-mode control with internal slope compensation and supports only forced Continuous Conduction Mode (FCCM), eliminating light-load discontinuous conduction. Its error amplifier features 5.5MHz open-loop bandwidth and 70dB gain, enabling stable regulation across 0–5A load range with internal or external compensation.
Protection architecture includes input UVLO (4.35V rising threshold), VIN overvoltage lockout (20V), output overvoltage protection (115% VOUT), high-side forward OCP (7.8A typical), low-side reverse OCP (−3.3A), and thermal shutdown at 165°C with 10°C hysteresis-ensuring robust operation in industrial and networking equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports multi-cell Li-ion batteries and standard 5V/12V rails without external pre-regulation. |
| Output Current | 5A continuous - delivered via integrated 5A/18V N-channel MOSFETs with 95mΩ high-side and 75mΩ low-side RDS(on) at TJ = 125°C. |
| Switching Frequency | Fixed 500kHz - enables compact magnetics and predictable EMI profile; no external sync required. |
| Feedback Reference | 0.800V ±1% - sets output voltage via resistor divider; enables precise 1.2V–5V regulation with <±1% accuracy. |
| Soft-Start | Programmable via SS pin (3.5µA pull-up) - limits inrush current; default 2.3ms when SS floating. |
| Power-Good Output | Open-drain PG with 1.5ms delay and 85% VOUT threshold - provides reliable system power sequencing and fault indication. |
| Thermal Protection | 165°C shutdown with 10°C hysteresis - prevents damage during overload or poor heatsinking; automatic recovery on cooldown. |
Pinout & Package
ISL85005AFRZ-T uses a 12-pin 3mm × 4mm Dual Flat No-Lead (DFN) package with exposed thermal pad (EPAD) for enhanced heat dissipation. θJA = 41°C/W and θJC = 3°C/W enable high-power density designs in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SS) | Soft-start control | 3.5µA internal current source charges external capacitor; determines ramp time of output voltage during startup. |
| 2 (PG) | Power-good indicator | Open-drain output asserts high after VOUT reaches 85% of target and remains stable for ≥1.5ms. |
| 3 (EN) | Enable input | Active-high logic; device enabled when voltage exceeds 0.6V (with 100mV hysteresis); pulls down PHASE when disabled. |
| 4 (FB) | Feedback node | Inverting input to error amplifier; regulates output by comparing divided VOUT against 0.8V reference. |
| 5 (COMP) | Compensation node | Connect to FB for external loop compensation; short to AGND selects internal compensation network. |
| 6 (AGND) | Analog ground | Reference for internal analog circuitry; must be tied to PCB ground plane and connected to PGND internally. |
| 7,8 (PHASE) | Switch node | Drives external output inductor; connects to drain of high-side MOSFET and source of low-side MOSFET. |
| 9,10 (VIN) | Main power input | Supplies gate drivers and high-side switch; requires local 10µF ceramic decoupling to PGND. |
| 11 (VDD) | Internal LDO output | 5V regulated supply for control circuitry; connect 1µF capacitor to ground; tie to VIN if VIN ≤ 5.5V. |
| 12 (BOOT) | Bootstrap supply | Floating rail for high-side gate driver; requires 0.1µF capacitor between BOOT and PHASE. |
| (EPAD) | Power ground / thermal pad | Source connection for low-side MOSFET and primary thermal path; must be soldered to large copper pour with multiple vias. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A/18V FETs | Eliminates external MOSFETs and gate drivers, reducing BOM count and layout complexity for 5A PoL designs. |
| Programmable soft-start | Prevents input inrush and output overshoot by controlling startup dV/dt via external capacitor on SS pin. |
| Forced CCM only | Ensures consistent ripple and EMI behavior across full load range-critical for noise-sensitive digital loads. |
| Integrated bootstrap diode | Removes need for external bootstrap diode while providing undervoltage detection to prevent shoot-through. |
| Comprehensive protection suite | Covers input UVLO/OVP, output OVP, high-side/low-side OCP (forward/reverse), and thermal shutdown-no external monitoring IC needed. |
Applications
| Industrial PLC I/O Module | Network Router PoL Supply |
|---|---|
Use Scenario: Powering FPGA I/O banks and ADC/DAC interfaces in modular automation controllers. IC Role / Device Role / Timing Role: Primary 3.3V/5A point-of-load regulator converting 12V backplane rail. Use Value: Fixed 500kHz switching enables predictable filter design; FCCM ensures stable ripple under dynamic I/O loading. | Use Scenario: Generating 1.8V core supply for multi-core network processors in enterprise routers. IC Role / Device Role / Timing Role: High-efficiency buck converter delivering tightly regulated 1.8V at up to 5A from 12V intermediate bus. Use Value: ±1% 0.8V reference and programmable soft-start ensure clean power-up sequence for sensitive SoCs. |
| Battery-Powered Test Equipment | Embedded Vision System |
Use Scenario: Portable oscilloscope or signal generator requiring stable 5V/3.3V rails from 2S–4S Li-ion packs (8.4V–16.8V). IC Role / Device Role / Timing Role: Main DC/DC regulator supporting wide-input battery operation with low quiescent current (4.5mA typical). Use Value: 4.5V–18V input range accommodates full battery discharge curve; thermal shutdown protects during field use. | Use Scenario: Powering image sensor, ISP, and memory subsystems in edge AI cameras. IC Role / Device Role / Timing Role: 1.2V/5A core supply for vision SoC with strict transient response requirements. Use Value: Fast load-transient response (≤20µs recovery) and PG signal enable coordinated power sequencing with sensor initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4572GQB-A | Fixed 500kHz, 5A, 4.5–36V input, integrated FETs, but lacks programmable soft-start and has higher RDS(on) (110/85mΩ). | Suitable for wider input ranges (up to 36V); less optimal for tight soft-start control in battery start-up. | Select MPQ4572GQB-A only when input exceeds 18V; verify thermal performance with higher conduction losses. |
| TPS54560BQPWPRQ1 | Adjustable 100–2500kHz, 5A, 3.5–60V input, external compensation only, no integrated soft-start pin. | Offers frequency flexibility and automotive AEC-Q100 qualification; requires external RC soft-start network. | Choose TPS54560BQPWPRQ1 for automotive-grade designs or when variable switching frequency is required for EMI tuning. |
Compared with MPQ4572GQB-A and TPS54560BQPWPRQ1, the ISL85005AFRZ-T delivers superior thermal performance (θJC = 3°C/W), precise soft-start control without external components, and optimized 4.5–18V operation-making it ideal for space-constrained industrial and embedded systems where input range and startup behavior are tightly bounded.
Availability
ISL85005AFRZ-T is available at Aetrix Electronics and suitable for industrial PLCs, network infrastructure equipment, and battery-powered test instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL85005AFRZ-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 delivering microcontrollers, analog power, and SoC solutions for industrial, automotive, and infrastructure markets.
The ISL85005AFRZ-T belongs to Renesas' Power Management family, engineered specifically for high-density, high-efficiency point-of-load DC/DC conversion in space- and thermally-constrained embedded systems.
FAQ
What is the maximum output current capability of the ISL85005AFRZ-T?
The ISL85005AFRZ-T delivers up to 5A continuous output current using its integrated 5A/18V high-side and low-side N-channel MOSFETs. Performance is validated across −40°C to +125°C junction temperature with proper PCB thermal design (e.g., EPAD soldered to ≥4 cm² copper area). Peak current capability is limited by high-side forward OCP at 7.8A typical.
Does the ISL85005AFRZ-T support external frequency synchronization?
No, the ISL85005AFRZ-T does not support external frequency synchronization. It is the 'A' variant of the ISL85005 family and features a fixed 500kHz internal oscillator. The non-A version (e.g., ISL85005FRZ-T) includes a SYNC/MODE pin for synchronization and mode selection; ISL85005AFRZ-T replaces that pin with SS for programmable soft-start.
How is soft-start configured on the ISL85005AFRZ-T?
Soft-start on the ISL85005AFRZ-T is configured via the SS pin (Pin 1), which sources a precise 3.5µA current to charge an external capacitor to ground. Soft-start time tSS ≈ (VREF × CSS) / 3.5µA, where VREF = 0.8V. With SS left floating, the device defaults to 2.3ms soft-start. This eliminates need for external timing resistors or complex RC networks.
What protection features are built into the ISL85005AFRZ-T?
The ISL85005AFRZ-T integrates input UVLO (4.35V rising), VIN overvoltage lockout (20V), output overvoltage protection (115% VOUT), high-side cycle-by-cycle current limit (7.8A typical), low-side forward/reverse overcurrent protection (8.6A / −3.3A), and thermal shutdown at 165°C with 10°C hysteresis. All protections latch off or auto-recover per design-no external fault management circuitry required.
Can the ISL85005AFRZ-T operate in Diode Emulation Mode (DEM)?
No, the ISL85005AFRZ-T operates exclusively in Forced Continuous Conduction Mode (FCCM). DEM is supported only on the base ISL85005 (non-A) variant via the SYNC/MODE pin. The ISL85005AFRZ-T removes that functionality to dedicate Pin 1 to SS, ensuring deterministic ripple and EMI behavior across all load conditions-including light loads.
ISL85005AFRZ-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):
- 15V
- Current - Output:
- 5A
- 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)
ISL85005AFRZ-T FAQ
1.How can I place an order for ISL85005AFRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85005AFRZ-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 ISL85005AFRZ-T reliable?
The price and inventory of ISL85005AFRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85005AFRZ-T is usually 5 days.
3.What payment methods are accepted for ISL85005AFRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85005AFRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85005AFRZ-T?
ISL85005AFRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85005AFRZ-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 ISL85005AFRZ-T?
For technical support, including ISL85005AFRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85005AFRZ-T requirements.
6.How does Aetrix verify that ISL85005AFRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL85005AFRZ-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 ISL85005AFRZ-T meets industry standards.
7.What is the process for return or replacement of ISL85005AFRZ-T?
All ISL85005AFRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL85005AFRZ-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 ISL85005AFRZ-T part is unused and in its original packaging.
Return procedure for ISL85005AFRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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