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Renesas ISL85005FRZ
- Part No.:
- ISL85005FRZ
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85005FRZ.pdf
- Description:
- IC REG BUCK ADJ 5A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,298
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Product details
Overview
ISL85005FRZ from Renesas Electronics is a monolithic synchronous buck regulator with integrated 5A/18V high-side and low-side MOSFETs, fixed 500kHz switching frequency, internal slope-compensated current-mode control, and synchronization capability (300–2MHz). It delivers up to 5A output current from a 4.5V–18V input, supports Diode Emulation Mode (DEM) or Forced CCM, and targets point-of-load conversion in 12V rail systems.
For engineers reviewing the ISL85005FRZ datasheet, ISL85005FRZ pinout, ISL85005FRZ application, or ISL85005FRZ equivalent, key selection criteria include its dual-mode light-load efficiency, 0.8V ±1% feedback reference, integrated bootstrap diode with UV detection, thermal shutdown, and robust protection suite including high-side cycle-by-cycle OCP and reverse current limiting.
Technical Context
The ISL85005FRZ implements current-mode control with internal slope compensation for stable loop response across line/load variations. Its oscillator supports internal 500kHz operation or external synchronization via the SYNC/MODE pin, enabling noise-sensitive system timing alignment.
It features dual conduction mode selection: forced Continuous Conduction Mode (FCCM) for low-noise ripple or Diode Emulation Mode (DEM) for high light-load efficiency. The device integrates an internal 5V LDO (VDD), undervoltage-protected bootstrap circuit, and zero-cross detection for seamless DEM transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports multi-cell battery inputs and standard 5V/12V rails without external pre-regulation. |
| Output Current | 5A continuous - enables single-chip conversion for mid-power PoL applications like FPGA core supplies. |
| Switching Frequency | 500kHz (internal default), syncable 300–2000kHz - balances efficiency, size, and EMI in compact layouts. |
| Feedback Reference | 0.800V ±1% - enables precise output regulation down to sub-1V with minimal resistor divider error. |
| Protection Features | Input UVLO (4.35V rising), VIN/VOUT OVP, high-side OCP (7.8A), low-side reverse OCP (−3.3A), thermal shutdown (165°C) - ensures robust operation under fault conditions. |
| Soft-Start Time | Fixed 2.3ms - limits inrush current during startup without requiring external capacitor. |
| Package | 12-pin 3mm × 4mm DFN with EPAD - provides low thermal resistance (θJC = 3°C/W) for high-power density designs. |
Pinout & Package
ISL85005FRZ uses a RoHS-compliant 12-lead 3mm × 4mm Dual Flat No-Lead (DFN) package with exposed thermal pad (EPAD) for enhanced heat dissipation. Pin numbering follows top-view layout per FN8871 Rev.2.00, Page 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC/MODE) | Synchronization and mode selection input | Connect to VDD for FCCM, AGND for DEM, or external clock (300–2MHz) for synchronized operation; internal 1MΩ pull-up prevents floating state. |
| 2 (PG) | Open-drain power-good indicator | Asserts high ~1.5ms after output reaches 85% of target; requires external pull-up (10–100kΩ) to VDD or ≤5.5V rail. |
| 3 (EN) | Enable control input | Active-high logic; device enabled when voltage exceeds 0.6V (with 100mV hysteresis); pulls down to disable. |
| 4 (FB) | Feedback node for output voltage regulation | Connects to resistor divider; regulates output using 0.8V reference; leakage <10nA minimizes divider error. |
| 5 (COMP) | Error amplifier compensation node | Supports internal compensation (connect to AGND) or external network (COMP–FB) for custom loop tuning. |
| 6 (AGND) | Analog ground reference | Return path for internal analog circuits; must be connected to PCB ground plane; internally tied to PGND. |
| 7,8 (PHASE) | Switch node connection | Drives external output inductor; handles high dv/dt switching; connects to BOOT capacitor (0.1µF) and inductor. |
| 9,10 (VIN) | Main power input | Accepts 4.5–18V input; requires local ceramic decoupling to PGND; powers internal FETs and drivers. |
| 11 (VDD) | Internal LDO output | 5V regulated supply (4.3–5.5V) for control circuitry; requires 1µF bypass capacitor; connect directly to VIN if VIN = 3–5.5V. |
| 12 (BOOT) | Bootstrap supply for high-side gate driver | Connected via 0.1µF capacitor to PHASE; includes undervoltage detection to prevent shoot-through. |
| (EPAD) PGND | Power ground and thermal pad | Source connection for low-side MOSFET; must be soldered to large PCB copper area with multiple vias for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A/18V MOSFETs | Eliminates external switch selection and layout complexity; RDS(ON) = 57mΩ (high-side) / 40mΩ (low-side) at 100mA ensures low conduction loss. |
| Diode Emulation Mode (DEM) | Enables discontinuous conduction at light loads, improving efficiency by >15% at 100mA vs FCCM in 12V→3.3V conversion. |
| Integrated bootstrap diode with UV detection | Reduces BOM count by one component while preventing high-side driver failure due to insufficient bootstrap voltage. |
| Robust protection suite | Includes cycle-by-cycle high-side OCP, low-side forward/reverse OCP, input/output OVP, UVLO, and thermal shutdown - reduces need for external fault management circuitry. |
| Small thermally enhanced DFN | 3mm × 4mm footprint with EPAD achieves θJA = 41°C/W and θJC = 3°C/W, enabling 5A operation without heatsink in typical 2-layer boards. |
Applications
| Network Power Conversion | Battery-Powered Embedded Systems |
|---|---|
Use Scenario: Regulating 12V intermediate bus to 3.3V/1.8V for Ethernet PHYs and packet processors in small-form-factor switches. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering clean, tightly regulated power with fast transient response. Use Value: DEM mode extends battery life in standby; 500kHz switching allows compact 3.3µH inductor and 47µF output capacitance. | Use Scenario: Powering ARM Cortex-A series SoCs in portable test equipment with 2-cell Li-ion (6–8.4V) input. IC Role / Device Role / Timing Role: Main DC-DC converter supplying core voltage (1.2V) and I/O rail (3.3V) with programmable sequencing via EN/PG. Use Value: Wide 4.5–18V input range accommodates full battery discharge curve; thermal shutdown protects against enclosure overheating. |
| Industrial Control I/O Modules | Multi-Function Printer Logic Supplies |
Use Scenario: Generating isolated 5V and 3.3V rails from 24V factory bus for PLC digital I/O conditioning and microcontroller operation. IC Role / Device Role / Timing Role: Non-isolated buck stage preceding isolated DC-DC modules; operates in FCCM for low-noise digital supply. Use Value: Input OVP (20V threshold) safeguards against 24V transients; PG signal enables safe firmware boot sequencing. | Use Scenario: Supplying FPGA configuration, image processor, and sensor interface rails in compact MFP mainboard. IC Role / Device Role / Timing Role: High-current (5A) buck regulator for FPGA core voltage (1.2V) with tight ±1% output tolerance. Use Value: 0.8V ±1% reference and internal compensation simplify design; 2.3ms soft-start prevents mechanical relay chatter during power-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL85005AFRZ | Fixed 500kHz frequency; programmable soft-start (SS pin) instead of SYNC/MODE; no DEM support - operates only in FCCM. | Preferred where predictable startup timing and absence of light-load switching noise are critical (e.g., audio subsystems). | Select ISL85005AFRZ when DEM is unnecessary and soft-start customization is required; not drop-in compatible due to pin function reassignment (SS vs SYNC/MODE). |
| MP2451DT-LF-Z | Monolithic 0.6A buck (not 5A); 36V max input; no DEM; no sync input; different pinout and package (SOT-23-6). | Only suitable for low-current auxiliary rails (e.g., sensor bias), not primary 5A loads. | Choose MP2451DT-LF-Z only for cost-sensitive, low-power auxiliary supplies - not a functional or pin-compatible alternative for ISL85005FRZ's 5A PoL role. |
Compared with ISL85005AFRZ and MP2451DT-LF-Z, the ISL85005FRZ uniquely combines 5A capability, DEM/FCCM flexibility, and synchronization in a thermally optimized 3×4mm DFN - making it optimal for space-constrained, efficiency-critical 12V-input PoL designs.
Availability
ISL85005FRZ is available at Aetrix Electronics and suitable for network infrastructure, battery-powered embedded systems, and industrial control applications requiring stable component supply and long-term production continuity.
Supply support for ISL85005FRZ 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 connectivity solutions for automotive, industrial, and enterprise markets.
The ISL85005FRZ belongs to Renesas' ISL8500x family of monolithic synchronous buck regulators, engineered for high-efficiency, low-noise, and robust point-of-load conversion in space-constrained 4.5–18V input systems.
FAQ
What is the switching frequency configuration of the ISL85005FRZ?
The ISL85005FRZ has a default internally set switching frequency of 500kHz and supports external synchronization from 300kHz to 2MHz via the SYNC/MODE pin. Unlike the ISL85005A variant, it does not offer programmable soft-start but retains full mode selection (FCCM/DEM) and sync capability - making it ideal for noise-sensitive, multi-rail systems requiring timing alignment.
Does the ISL85005FRZ support both forced CCM and Diode Emulation Mode?
Yes, the ISL85005FRZ supports both modes via the SYNC/MODE pin: connect to AGND for Diode Emulation Mode (DEM) to maximize light-load efficiency, or to VDD for Forced Continuous Conduction Mode (FCCM) to minimize output ripple and EMI. This dual-mode capability is confirmed in the FN8871 datasheet Section 1.2 and Pin Description Table, distinguishing it from the ISL85005AFRZ which operates FCCM-only.
What protection features are integrated into the ISL85005FRZ?
The ISL85005FRZ integrates input UVLO (4.35V rising), input and output overvoltage protection (20V VIN OVP, 115% VOUT OVP), high-side cycle-by-cycle current limit (7.8A), low-side forward and reverse overcurrent protection (8.6A forward, −3.3A reverse), and thermal shutdown at 165°C with 10°C hysteresis. These protections are fully specified in the Electrical Specifications table (Page 7–8, FN8871 Rev.2.00) and require no external components to activate.
Can the ISL85005FRZ operate from a 5V input rail?
Yes, the ISL85005FRZ supports input voltages from 4.5V to 18V, including standard 5V rails. When VIN is between 3V and 5.5V, the datasheet recommends connecting VDD directly to VIN to improve efficiency by bypassing the internal LDO - a configuration validated in the Recommended Operating Conditions table (Page 7, FN8871 Rev.2.00).
What is the thermal performance of the ISL85005FRZ package?
The ISL85005FRZ uses a 12-pin 3mm × 4mm DFN with EPAD, achieving θJC = 3°C/W and θJA = 41°C/W (measured per JEDEC JESD51-2). This enables reliable 5A operation on standard 2-layer PCBs with adequate copper pour and thermal vias - confirmed in the Thermal Information table (Page 7, FN8871 Rev.2.00) and Package Outline Drawing (Page 22).
ISL85005FRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tube
- 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)
ISL85005FRZ FAQ
1.How can I place an order for ISL85005FRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85005FRZ 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 ISL85005FRZ reliable?
The price and inventory of ISL85005FRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85005FRZ is usually 5 days.
3.What payment methods are accepted for ISL85005FRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85005FRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85005FRZ?
ISL85005FRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85005FRZ 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 ISL85005FRZ?
For technical support, including ISL85005FRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85005FRZ requirements.
6.How does Aetrix verify that ISL85005FRZ is sourced from the original manufacturer or authorized distributors?
All ISL85005FRZ 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 ISL85005FRZ meets industry standards.
7.What is the process for return or replacement of ISL85005FRZ?
All ISL85005FRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL85005FRZ, 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 ISL85005FRZ part is unused and in its original packaging.
Return procedure for ISL85005FRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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