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Renesas ISL85009FRZ-T
- Part No.:
- ISL85009FRZ-T
- Manufacturer:
- Renesas
- Package:
- 15-WFQFN
- Datasheet:
-
ISL85009FRZ-T.pdf
- Description:
- IC REG BUCK ADJ 9A 15TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,964
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Product details
Overview
ISL85009FRZ-T from Renesas Electronics is a monolithic synchronous buck regulator delivering 9A continuous output current from a 3.8V–18V input, featuring peak-current-mode control, integrated 17mΩ/8.5mΩ MOSFETs, and selectable 300kHz/600kHz switching frequency-designed for point-of-load regulation in server and telecom power systems.
For engineers reviewing the ISL85009FRZ-T datasheet, ISL85009FRZ-T pinout, ISL85009FRZ-T application, or ISL85009FRZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed protection schemes (hiccup/latch-off OCP), thermal shutdown at 160°C, and real-world efficiency curves at 1.8V/5V outputs under CCM/DEM operation.
Technical Context
The ISL85009FRZ-T implements a peak-current-mode PWM controller with thermally compensated current sensing, internal/external compensation options, and dual-mode light-load operation-forced CCM when SYNC is floated, diode emulation mode (DEM) when SYNC is grounded. Its error amplifier features 5.5MHz bandwidth and 70dB gain, referenced to a precise 0.6V ±1.75% feedback threshold.
Switching frequency is set via FREQ pin (300kHz/GND, 600kHz/floating) or synchronized externally from 100kHz to 1MHz on SYNC; minimum on-time is 150ns, supporting high VIN/VOUT ratios. Protection includes high-side OCP (15A typ), low-side forward/reverse OCP (21A/–7.5A), input overvoltage lockout (20.5V rising), and thermal shutdown with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | PVIN = 3.8V–18V DC; supports wide-input industrial and telecom rails including 12V and 48V-derived supplies. |
| Output Current | 9A continuous; sustained at full load with proper thermal design using the 3.5mm×3.5mm TQFN package's 1.2°C/W θJC. |
| Feedback Reference | 0.6V ±1.75% over –40°C to +125°C; enables accurate output programming down to 0.6V with external resistor divider. |
| Switching Frequency | Selectable 300kHz (FREQ=GND) or 600kHz (FREQ=float); externally synchronizable up to 1MHz for EMI reduction. |
| Power MOSFET RDS(ON) | High-side: 17mΩ, low-side: 8.5mΩ @ 900mA; minimizes conduction loss and enables >90% efficiency at 5V/6A (VIN=12V). |
| OCP Schemes | Selectable via MODE pin: hiccup (150ms blanking) or latch-off; prevents thermal runaway during sustained overload. |
| Thermal Shutdown | Activates at TJ = 160°C with 10°C hysteresis; ensures safe recovery before re-enabling regulation after cooling. |
Pinout & Package
ISL85009FRZ-T is housed in a RoHS-compliant, 15-lead 3.5mm×3.5mm TQFN package with exposed thermal pad (PKG DWG L15.3.5x3.5), optimized for high-power density and thermal performance (θJA = 33°C/W, θJC = 1.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SYNC | Synchronization & light-load mode control | Float for forced CCM; GND for DEM; external clock input (100–1000kHz) with rising-edge trigger. |
| 2 MODE | OCP scheme selection | Float → hiccup mode; GND → latch-off mode; determines fault recovery behavior after 8 consecutive OCP events. |
| 3 FREQ | Default switching frequency selection | Float → 600kHz; GND → 300kHz; sets internal compensation network (800kΩ/30pF or 1200kΩ/30pF). |
| 4 PG | Open-drain power-good indicator | Asserts high when FB is 90–116% of target; requires external pull-up; 1.5ms delay on rise, 23µs on fall. |
| 5 VDD | Internal LDO decoupling | Supplies 5V core bias; connect 2.2µF ceramic to GND; tie directly to VIN if VIN = 3–5.5V for efficiency gain. |
| 6 BOOT | High-side gate driver bootstrap supply | Connect 0.1µF capacitor between BOOT and PHASE; enables N-channel high-side MOSFET drive. |
| 7 GND | Power ground reference | Primary return for power stage; must be connected to PCB ground plane via multiple vias for thermal relief. |
| 8 PHASE | Switch node | Connects to source of high-side FET and drain of low-side FET; interfaces with external inductor and output capacitor. |
| 9 PVIN | Power stage input supply | High-current input for PWM stage; requires local ceramic decoupling to GND near pin. |
| 10 FB | Feedback voltage sense | Inverting input to error amplifier; sets output via resistor divider to internal 0.6V reference. |
| 11 COMP | Error amplifier output | Connect 200Ω to GND for internal compensation; external RC network required for custom loop tuning. |
| 12,13 DNC | No-connect terminals | Must remain unconnected; floating per design; no routing or soldering permitted. |
| 14 EN | Enable control | Active-high; device enabled when voltage ≥0.6V; internal POR ensures safe startup after VIN/PVIN/VDD thresholds met. |
| 15 VIN | Control circuit input supply | Bias source for internal LDO; requires 1µF ceramic decoupling to GND; valid range 4.5V–18V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | Monolithic 17mΩ high-side + 8.5mΩ low-side N-MOSFETs eliminate external switches and reduce BOM count by ≥4 components. |
| Prebias Start-Up | Supports start-up into prebiased output (VOUT < programmed value); prevents reverse current flow during ramp-up. |
| Flexible Compensation | Internal compensation (200Ω from COMP to GND) covers most designs; external network allows optimization for dynamic load response. |
| Programmable Light-Load Mode | SYNC pin selects DEM (efficiency-optimized at light loads) or FCCM (low-noise, constant-frequency operation). |
| Robust Fault Protection | Five-layer safety: high/low-side OCP, reverse current limit, input/output OVP, and thermal shutdown-all independently monitored. |
| Space-Efficient Packaging | 3.5mm×3.5mm TQFN with 0.8mm max height fits dense POL layouts; exposed pad enables direct thermal path to PCB ground plane. |
Applications
| Server Point-of-Load Regulation | Industrial PLC Power Supply |
|---|---|
Use Scenario: Delivering stable 1.8V/5V rails to FPGA, ASIC, or memory subsystems in 1U rack servers with strict thermal and space constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing transient load steps up to 6A/µs while maintaining <±1% output regulation. Use Value: Integrated MOSFETs and 600kHz operation enable compact 25mm² solution size; 92% efficiency at 5V/6A reduces system cooling requirements. |
Use Scenario: Generating isolated 3.3V/5V logic supplies in programmable logic controllers operating in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Main DC-DC converter powering I/O modules, communication interfaces, and microcontroller cores under variable load conditions. Use Value: –40°C to +125°C junction rating and hiccup-mode OCP ensure reliable operation during brownouts or short-circuit faults without latch-up. |
| Telecom Line Card Power | Test & Measurement Equipment |
Use Scenario: Providing clean, low-noise 1.2V/1.8V supplies to high-speed SerDes transceivers on 40G/100G line cards with stringent ripple and EMI limits. IC Role / Device Role / Timing Role: High-efficiency POL regulator synchronized to system clock (via SYNC pin) to avoid beat frequencies in sensitive analog sections. Use Value: External synchronization (100–1000kHz) and DEM mode reduce conducted EMI; <15mVpp output ripple at 9A supports jitter-sensitive applications. |
Use Scenario: Powering precision ADCs, DACs, and signal chain components in benchtop analyzers requiring ultra-stable, low-drift voltage rails. IC Role / Device Role / Timing Role: Secondary regulated supply with tight load/line regulation (±0.5%) and fast transient response (<50µs to settle within 1% after 5A step). Use Value: 0.6V reference accuracy (±1.75%) and internal slope compensation ensure consistent loop stability across temperature and input variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL85012FRZ-T | 12A rated output current; identical pinout, package, and feature set; higher RDS(ON) mismatch (19mΩ/9.5mΩ) increases conduction loss at full load. | Required where >9A continuous current is needed; same layout reuse possible but thermal design must accommodate higher power dissipation. | Select when output current headroom beyond 9A is mandatory; verify thermal margin with θJC = 1.2°C/W and 12A load. |
| MP2451DT-LF-Z | 3A rated; 2.5V–36V input; external MOSFETs required; no integrated OCP scheme selection or DEM mode; smaller 8-pin SOIC package. | Suitable for lower-power industrial sensors or auxiliary rails; lacks prebias start-up, sync capability, and thermal shutdown hysteresis. | Choose only for cost-sensitive, low-current (<4A), non-critical applications where board space and feature depth are secondary. |
Compared with ISL85009FRZ-T, ISL85012FRZ-T offers higher current capacity in identical form factor but trades off efficiency at 9A, while MP2451DT-LF-Z sacrifices integration, protection, and precision for lower unit cost and wider input range-making ISL85009FRZ-T optimal for 9A POLs demanding reliability, thermal robustness, and design simplicity.
Availability
ISL85009FRZ-T is available at Aetrix Electronics and suitable for servers and cloud infrastructure POLs, industrial PLCs, and telecom line card power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL85009FRZ-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 ISL85009FRZ-T belongs to Renesas' high-current monolithic buck regulator product line, engineered specifically for space-constrained, high-efficiency point-of-load applications in datacenter, networking, and factory automation systems.
FAQ
What is the maximum input voltage the ISL85009FRZ-T can withstand?
The ISL85009FRZ-T features integrated input overvoltage protection that disables the regulator when PVIN exceeds 20.5V (rising edge). Absolute maximum rating is 22V, but operation above 18V violates recommended conditions and risks permanent damage. The protection circuit automatically recovers once PVIN falls below 19.5V, initiating soft-start to resume regulation.
Does the ISL85009FRZ-T support start-up into a prebiased output?
Yes, the ISL85009FRZ-T supports prebias start-up: both high-side and low-side MOSFETs remain off until the internal soft-start voltage exceeds the FB pin voltage, preventing reverse current flow into an already charged output rail. This behavior is active regardless of SYNC or MODE pin configuration and is confirmed in Figure 22–24 of the FN8918 datasheet.
How do I configure the ISL85009FRZ-T for 300kHz operation?
To configure the ISL85009FRZ-T for 300kHz default switching frequency, connect the FREQ pin (Pin 3) directly to GND. This also selects the 1200kΩ/30pF internal compensation network. Ensure the SYNC pin is either floated (for FCCM) or grounded (for DEM), and confirm COMP is tied to GND via 200Ω for internal compensation.
What thermal derating applies to the ISL85009FRZ-T at 125°C ambient?
At +125°C ambient, the ISL85009FRZ-T's 9A rating assumes adequate PCB copper area (≥4 cm² thermal pad connection with ≥6 vias) and airflow. With θJA = 33°C/W, junction temperature rises ~30°C above ambient at full load-well below the 160°C shutdown threshold. Derating is not required unless ambient exceeds 125°C or thermal interface resistance increases significantly.
Can the ISL85009FRZ-T be synchronized to an external clock?
Yes, the ISL85009FRZ-T accepts external synchronization from 100kHz to 1MHz on the SYNC pin (Pin 1), triggered by the rising edge of the input clock. The external signal must have >100ns pulse width and logic-high level ≥1.2V. When synchronized, the FREQ pin setting is ignored, and internal compensation remains valid for the actual operating frequency.
ISL85009FRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 15-WFQFN
- 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):
- 3.8V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 9A
- Frequency - Switching:
- 300kHz, 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 15-TQFN (3.5x3.5)
ISL85009FRZ-T FAQ
1.How can I place an order for ISL85009FRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85009FRZ-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 ISL85009FRZ-T reliable?
The price and inventory of ISL85009FRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85009FRZ-T is usually 5 days.
3.What payment methods are accepted for ISL85009FRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85009FRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85009FRZ-T?
ISL85009FRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85009FRZ-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 ISL85009FRZ-T?
For technical support, including ISL85009FRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85009FRZ-T requirements.
6.How does Aetrix verify that ISL85009FRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL85009FRZ-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 ISL85009FRZ-T meets industry standards.
7.What is the process for return or replacement of ISL85009FRZ-T?
All ISL85009FRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL85009FRZ-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 ISL85009FRZ-T part is unused and in its original packaging.
Return procedure for ISL85009FRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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