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Renesas ISL85005AFRZ-T7A
- Part No.:
- ISL85005AFRZ-T7A
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85005AFRZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 5A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,061
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Product details
Overview
ISL85005AFRZ-T7A 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 continuous conduction mode (FCCM) only, and ±1% 0.8V feedback reference - designed for point-of-load conversion in 12V rail systems powering FPGAs, microcontrollers, and ASICs.
For engineers reviewing the ISL85005AFRZ-T7A datasheet, ISL85005AFRZ-T7A pinout, ISL85005AFRZ-T7A application, or ISL85005AFRZ-T7A equivalent, key selection criteria include input UVLO (4.35V rising), thermal shutdown (165°C), PG delay (1.5ms rise), internal compensation support, and DFN-12 (3mm×4mm) thermal performance with EPAD.
Technical Context
The ISL85005AFRZ-T7A implements current-mode control with internal slope compensation (550mV/µs at 500kHz) and a dedicated error amplifier (70dB gain, 5.5MHz bandwidth). Its FCCM-only operation eliminates light-load mode transitions, ensuring predictable loop stability and consistent EMI profile across 0–5A load range.
It integrates a 5V LDO (4.3–5.5V output, 50mA limit) powered from VIN, bootstrap circuitry with undervoltage detection on BOOT, and comprehensive protection: high-side cycle-by-cycle OCP (7.8A typ), low-side forward/reverse OCP (8.6A / −3.3A), input/output OVP, and thermal shutdown with 10°C hysteresis.
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 - enables single-chip conversion for mid-power SoC/FPGA core supplies. |
| Switching Frequency | Fixed 500kHz - balances efficiency, size, and EMI; eliminates external sync component overhead. |
| Feedback Reference | 0.800V ±1% - enables precise output regulation down to 0.8V with minimal resistor divider error. |
| Soft-Start | Programmable via SS pin (3.5µA current source); default 2.3ms when floating - limits inrush current during power-up. |
| Thermal Shutdown | 165°C with 10°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Package | 12-pin 3mm×4mm DFN with EPAD - provides low θJA (41°C/W) and robust thermal path for high-current operation. |
Pinout & Package
ISL85005AFRZ-T7A uses a RoHS-compliant 12-pin Dual Flat No-Lead (DFN) package, 3mm × 4mm body with exposed thermal pad (EPAD) on underside for enhanced heat dissipation. Pin pitch is 0.5mm; recommended solder profile per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SS) | Soft-start control | 3.5µA internal current source charges external capacitor; sets ramp time for controlled VOUT rise. |
| 2 (PG) | Power-good open-drain output | Asserts high after 1.5ms when VOUT reaches ≥85% of target; requires external pull-up to VDD or ≤5.5V rail. |
| 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 by comparing against 0.8V internal reference. |
| 5 (COMP) | Compensation node | Internal compensation selected by shorting to AGND; external network between COMP and FB enables custom loop tuning. |
| 6 (AGND) | Analog ground | Return for internal analog blocks; must connect to system ground plane - internally tied to PGND. |
| 7,8 (PHASE) | Switch node | High-frequency AC output connecting to external inductor; carries full switching current and voltage swing. |
| 9,10 (VIN) | Main power input | Supplies high-side gate driver and internal circuits; requires local ceramic decoupling to PGND. |
| 11 (VDD) | LDO output | Internally generated 5V supply (4.3–5.5V); powers control logic - bypass with 1µF ceramic to ground. |
| 12 (BOOT) | Bootstrap supply | Connects 0.1µF capacitor to PHASE; enables high-side N-MOSFET gate drive above VIN. |
| (EPAD) PGND | Power ground / thermal pad | Source connection for low-side MOSFET and primary thermal path; must be connected to ground plane via multiple vias. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A/18V MOSFETs | Eliminates external switch selection, layout complexity, and gate-drive design; reduces BOM count by ≥6 components. |
| Programmable soft-start | Prevents input rail collapse and output overshoot during startup; configurable from <1ms to >10ms via SS capacitor value. |
| Integrated bootstrap diode with UV detection | Removes external bootstrap diode; built-in undervoltage lockout prevents high-side shoot-through during boot capacitor depletion. |
| Comprehensive fault protection | Covers input UVLO (4.35V), input OVP (20V), output OVP (120% VOUT), thermal shutdown (165°C), and dual-direction OCP - enables robust unattended operation. |
| Internal compensation support | Default configuration requires only COMP-to-AGND short and no external RC network - accelerates design-in for standard applications. |
Applications
| Industrial PLC I/O Module | Network Switch PoL Supply |
|---|---|
|
Use Scenario: Converting 12V backplane rail to 3.3V for digital I/O buffer ICs and isolated communication transceivers. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering regulated 3.3V at up to 5A with tight transient response. Use Value: FCCM-only operation ensures consistent 500kHz switching during load steps, simplifying EMI filter design and meeting CISPR-32 Class A limits. |
Use Scenario: Generating 1.8V core voltage for Ethernet PHY and packet processor ASICs in 1U rack-mounted switches. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with PG signal enabling sequenced power-up of multi-rail subsystems. Use Value: ±1% 0.8V reference and programmable soft-start ensure accurate 1.8V output and prevent brownout during cold start under full load. |
| Battery-Powered Test Equipment | Embedded Vision Camera Core Rail |
|
Use Scenario: Stepping down 2S–4S Li-ion battery pack (8.4V–16.8V) to 5V for USB-C PD controller and display interface ICs. IC Role / Device Role / Timing Role: Input-flexible buck regulator maintaining regulation across full battery discharge curve. Use Value: 4.5V–18V input range and 5A capability support wide battery voltage swing while delivering stable 5V at full load until cutoff. |
Use Scenario: Providing 1.2V core supply to image signal processor (ISP) in automotive-grade ADAS camera modules. IC Role / Device Role / Timing Role: Compact, thermally efficient DC-DC stage operating in harsh ambient temperatures (−40°C to +125°C). Use Value: DFN-12 EPAD package and 165°C thermal shutdown enable reliable operation in sealed enclosures with limited airflow. |
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 | 3A rated, 2MHz fixed frequency, no PG or programmable soft-start; smaller 8-pin SOIC-EP package. | Suitable for lower-current, space-constrained designs where 5A headroom and power sequencing are not required. | Select MP2451DT-LF-Z only if load current stays below 3A and higher switching frequency justifies reduced inductor size. |
| TPS54560QDGQRQ1 | 5A, 3.5–60V input, adjustable frequency (100kHz–2.5MHz), integrated soft-start but no PG; thermally enhanced 10-pin MSOP-PowerPAD. | Targets wide-input industrial/motor drives where input may exceed 18V; lacks power-good signaling for strict sequencing. | Choose TPS54560QDGQRQ1 only when input voltage exceeds 18V or extended temperature qualification (AEC-Q100) is mandatory. |
Compared with MP2451DT-LF-Z and TPS54560QDGQRQ1, ISL85005AFRZ-T7A delivers guaranteed 5A output with integrated PG, programmable soft-start, and optimized 500kHz operation for balanced efficiency and EMI - making it preferred for mid-power, sequenced, and thermally demanding applications.
Availability
ISL85005AFRZ-T7A is available at Aetrix Electronics and suitable for industrial PLC I/O modules, network switch point-of-load supplies, and battery-powered test equipment requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for ISL85005AFRZ-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 ISL85005AFRZ-T7A belongs to Renesas' ISL8500x family of monolithic synchronous buck regulators - engineered for high-efficiency, low-noise, and thermally robust point-of-load conversion in space-constrained embedded systems.
FAQ
What is the maximum input voltage rating for the ISL85005AFRZ-T7A?
The ISL85005AFRZ-T7A has an absolute maximum input voltage rating of +24V on VIN, PHASE, and related pins. However, its recommended operating input voltage range is strictly 4.5V to 18V per datasheet specifications. Operation above 18V risks violating functional limits such as input OVP threshold (20V) and may compromise reliability or safety margins.
Does the ISL85005AFRZ-T7A support external frequency synchronization?
No, the ISL85005AFRZ-T7A does not support external frequency synchronization. It is the ISL85005A variant with fixed 500kHz operation and programmable soft-start. The SYNC/MODE pin found on the ISL85005 is replaced by the SS pin on the ISL85005AFRZ-T7A, and no synchronization functionality is implemented in this part number.
How is the soft-start time configured on the ISL85005AFRZ-T7A?
The ISL85005AFRZ-T7A uses an internal 3.5µA current source connected to the SS pin. A capacitor (CSS) from SS to AGND sets the soft-start time as tSS ≈ (0.8V × CSS) / 3.5µA. With no capacitor, the default soft-start is 2.3ms. For example, a 0.022µF capacitor yields ~5.0ms, and a 0.1µF capacitor yields ~23ms - enabling precise control over inrush current.
What is the purpose of the PG (Power-Good) pin on the ISL85005AFRZ-T7A?
The PG pin on the ISL85005AFRZ-T7A is an open-drain output that signals valid regulation. It transitions high approximately 1.5ms after VOUT reaches ≥85% of its target value and remains high as long as VOUT stays within 80–120% of regulation. This enables safe power sequencing in multi-rail systems and provides system-level fault indication without requiring external monitoring circuitry.
Can the ISL85005AFRZ-T7A operate in diode emulation mode (DEM)?
No, the ISL85005AFRZ-T7A operates exclusively in forced continuous conduction mode (FCCM). Diode emulation mode (DEM) is only available on the ISL85005 variant, which uses the SYNC/MODE pin for mode selection. The ISL85005AFRZ-T7A replaces that pin with SS and disables DEM entirely - ensuring consistent switching behavior and predictable loop dynamics across all load conditions.
ISL85005AFRZ-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):
- 5V
- Voltage - Output (Max):
- -
- 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-T7A FAQ
1.How can I place an order for ISL85005AFRZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85005AFRZ-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 ISL85005AFRZ-T7A reliable?
The price and inventory of ISL85005AFRZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85005AFRZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL85005AFRZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85005AFRZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85005AFRZ-T7A?
ISL85005AFRZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85005AFRZ-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 ISL85005AFRZ-T7A?
For technical support, including ISL85005AFRZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85005AFRZ-T7A requirements.
6.How does Aetrix verify that ISL85005AFRZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL85005AFRZ-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 ISL85005AFRZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL85005AFRZ-T7A?
All ISL85005AFRZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL85005AFRZ-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 ISL85005AFRZ-T7A part is unused and in its original packaging.
Return procedure for ISL85005AFRZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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