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Renesas ISL85005FRZ-T
- Part No.:
- ISL85005FRZ-T
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85005FRZ-T.pdf
- Description:
- IC REG BUCK ADJ 5A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,428
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Product details
Overview
ISL85005FRZ-T from Renesas Electronics is a monolithic synchronous buck regulator with integrated 5A/18V high-side and low-side MOSFETs, 4.5V–18V input range, fixed 500kHz switching frequency, and synchronization capability up to 2MHz. It supports forced CCM or diode emulation mode (DEM) for light-load efficiency and delivers regulated output voltage via current-mode control with ±1% 0.8V reference - used in point-of-load supplies for embedded computing and network equipment.
For engineers reviewing the ISL85005FRZ-T datasheet, ISL85005FRZ-T pinout, ISL85005FRZ-T application, or ISL85005FRZ-T equivalent, key selection factors include its internal bootstrap diode, programmable soft-start absence (fixed 2.3ms), SYNC/MODE pin configuration flexibility, thermal shutdown at 165°C, and DFN-12 (3mm×4mm) package with exposed pad for enhanced thermal performance.
Technical Context
The ISL85005FRZ-T implements current-mode control with internal slope compensation and an internal oscillator set to 500kHz, configurable via external clock synchronization (300kHz–2MHz). Its MODE pin selects between forced continuous conduction mode (FCCM) and diode emulation mode (DEM), enabling high efficiency across load ranges.
Protection architecture includes high-side cycle-by-cycle current limit (7.8A typ), low-side forward/reverse overcurrent thresholds (8.6A / –3.3A), input UVLO (4.35V rising), input/output overvoltage lockout, and thermal shutdown with 10°C hysteresis - all integrated without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports multi-cell batteries and standard 12V/5V rails without pre-regulation. |
| Output Current | Up to 5A continuous - enables single-chip point-of-load conversion for FPGA, ASIC, and microprocessor core supplies. |
| Switching Frequency | Fixed 500kHz internal clock, synchronizable to 300kHz–2MHz - allows EMI optimization and power stage component reuse. |
| Feedback Reference | ±1% accurate 0.8V reference - ensures tight output regulation (e.g., ±12mV at 1.2V out) across temperature and line. |
| Thermal Shutdown | 165°C threshold with 10°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Package | 12-pin 3mm×4mm DFN with EPAD - provides low θJA (41°C/W) and direct thermal path to PCB ground plane. |
| Soft-Start Time | Fixed 2.3ms - limits inrush current during startup without requiring external capacitor. |
Pinout & Package
ISL85005FRZ-T uses a RoHS-compliant 12-pin Dual Flat No-Lead (DFN) package measuring 3mm × 4mm with exposed thermal pad (EPAD) on underside for optimal heat dissipation. The package is pin-compatible with ISL85005A variants and designed for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC/MODE) | Mode selection & sync input | Configures FCCM (pull to VDD), DEM (pull to AGND), or external clock sync (300kHz–2MHz); internal 1MΩ pull-up prevents floating state. |
| 2 (PG) | Power-good open-drain output | Signals regulation status after 1.5ms delay when output reaches 85% of target; requires external pull-up (10kΩ–100kΩ). |
| 3 (EN) | Enable control input | Active-high enable with 0.6V threshold and 100mV hysteresis; pulls device into shutdown when grounded. |
| 4 (FB) | Feedback node | Connects to resistor divider; regulates output using precise 0.8V reference - sets VOUT = 0.8V × (1 + R1/R2). |
| 5 (COMP) | Compensation node | Internal compensation enabled by shorting to AGND; external network between COMP and FB supports custom loop tuning. |
| 6 (AGND) | Analog ground reference | Return path for error amplifier and control circuitry; must be tied to PGND internally but routed separately on PCB. |
| 7,8 (PHASE) | Switch node | Drives external inductor; connects directly to source of low-side FET and drain of high-side FET - high dv/dt node requiring careful layout. |
| 9,10 (VIN) | Main power input | Accepts 4.5V–18V input; requires local ceramic decoupling (e.g., 10µF X7R) placed near pins 9/10 to PGND. |
| 11 (VDD) | LDO output supply | Internally generated 5V rail (4.3–5.5V) powering gate drivers and analog blocks; bypass with 1µF ceramic to AGND. |
| 12 (BOOT) | Bootstrap supply | Floating supply for high-side gate driver; requires 0.1µF ceramic capacitor between BOOT and PHASE. |
| (EPAD) | Power ground / thermal pad | Connected to low-side FET source and internal PGND; must be soldered to large PCB copper area with multiple vias for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A/18V MOSFETs | Eliminates external power switches and reduces BOM count while maintaining <95mΩ high-side and <75mΩ low-side RDS(on) at 100mA. |
| Internal bootstrap diode | Removes need for external bootstrap diode, simplifying layout and improving reliability in high-frequency operation. |
| Diode Emulation Mode (DEM) | Disables low-side FET during light loads to prevent reverse current, boosting efficiency at sub-500mA loads without external control. |
| Synchronization input | Enables system-level EMI reduction by aligning switching edges with master clock - critical in multi-rail power systems. |
| Built-in protection suite | Includes UVLO, input/output OVP, cycle-by-cycle OCP, reverse OCP, and thermal shutdown - no external fault monitoring required. |
Applications
| Network Equipment Power | Battery-Powered Systems |
|---|---|
Use Scenario: Providing 3.3V/5A supply to Ethernet PHYs and packet processors in compact access points. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 12V backplane to processor I/O voltage with fast transient response. Use Value: DEM mode maintains >85% efficiency at 100mA idle current, extending runtime; SYNC input enables noise shaping across multiple rails. | Use Scenario: Regulating 12V battery pack to 1.8V for FPGA core logic in portable test instrumentation. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in FCCM under full load and DEM at standby. Use Value: Integrated 5A MOSFETs and 0.8V reference enable ±1% output accuracy without trimming; 4.5V UVLO prevents brownout operation. |
| Embedded Computing | Point-of-Load Regulation |
Use Scenario: Delivering 5V/5A to ARM-based SoM modules in industrial controllers with space-constrained PCBs. IC Role / Device Role / Timing Role: Compact, thermally optimized DC/DC solution replacing discrete controller + DrMOS combinations. Use Value: 3mm×4mm DFN with EPAD achieves 41°C/W θJA - sustains full 5A output at 65°C ambient with minimal heatsinking. | Use Scenario: Generating 2.5V/5A for DDR memory termination in telecom baseband cards. IC Role / Device Role / Timing Role: Synchronous buck regulator with current-mode control ensuring stable loop behavior under dynamic load steps. Use Value: Internal slope compensation and ±1% VFB enable robust stability with standard 3.3µH inductors and 47µF output capacitors. |
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-T | Fixed 500kHz frequency; programmable soft-start via SS pin (3.5µA charge current); no SYNC capability. | Preferred where soft-start timing must be adjusted for inrush-sensitive loads (e.g., SSDs), but synchronization is unnecessary. | Select ISL85005AFRZ-T if soft-start customization is required and system clock sync is not needed. |
| MPQ4572GQB-AEC1-Z | Automotive-grade (AEC-Q100), 4.5V–60V input, 2A output, no DEM mode, different pinout and compensation scheme. | Targeted at automotive infotainment and ADAS; lacks DEM and sync features but offers extended input range and qualification. | Choose MPQ4572GQB-AEC1-Z only for AEC-Q100-compliant designs requiring >18V input - not a drop-in replacement. |
Compared with ISL85005AFRZ-T, the ISL85005FRZ-T offers synchronization flexibility at the cost of fixed soft-start; versus MPQ4572GQB-AEC1-Z, it delivers higher current and DEM efficiency in non-automotive industrial applications but lacks extended input voltage and qualification.
Availability
ISL85005FRZ-T is available at Aetrix Electronics and suitable for network equipment power, battery-powered systems, and embedded computing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL85005FRZ-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 automotive, industrial, and enterprise markets.
The ISL85005FRZ-T belongs to Renesas' high-efficiency monolithic buck regulator product line, engineered for compact, thermally robust point-of-load conversion in space- and efficiency-critical embedded systems.
FAQ
What is the switching frequency configuration of the ISL85005FRZ-T?
The ISL85005FRZ-T has a default internally set switching frequency of 500kHz and supports external synchronization from 300kHz to 2MHz via its SYNC/MODE pin. Unlike the ISL85005A variant, it does not offer programmable soft-start - instead providing a fixed 2.3ms soft-start time. This makes the ISL85005FRZ-T ideal for systems requiring EMI control through clock alignment without soft-start adjustment.
Does the ISL85005FRZ-T support diode emulation mode (DEM)?
Yes, the ISL85005FRZ-T supports Diode Emulation Mode (DEM) via its MODE pin: pulling pin 1 (SYNC/MODE) to AGND enables DEM, which disables the low-side MOSFET during light loads to prevent reverse current and improve efficiency below ~500mA. In contrast, connecting pin 1 to VDD configures Forced Continuous Conduction Mode (FCCM) for constant-frequency operation across all loads. This dual-mode capability is intrinsic to the ISL85005FRZ-T silicon and requires no external components.
What package type and thermal characteristics does the ISL85005FRZ-T use?
The ISL85005FRZ-T uses a 12-pin 3mm × 4mm Dual Flat No-Lead (DFN) package with exposed thermal pad (EPAD), achieving a junction-to-ambient thermal resistance (θJA) of 41°C/W under standard test conditions. Its θJC is 3°C/W, confirming highly efficient heat transfer from die to EPAD. The package is RoHS-compliant, moisture-sensitivity level 3 (MSL3), and rated for operation from –40°C to +125°C junction temperature - making it suitable for industrial and networking environments.
How does the ISL85005FRZ-T handle overcurrent and overvoltage protection?
The ISL85005FRZ-T integrates comprehensive protection: high-side cycle-by-cycle current limit (7.8A typical), low-side forward overcurrent (8.6A) and reverse overcurrent (–3.3A), input overvoltage lockout (19V threshold), output overvoltage detection, and thermal shutdown at 165°C with 10°C hysteresis. These functions operate autonomously without external components - for example, reverse OCP triggers when current flows from PHASE into the low-side FET during discontinuous conduction, preventing shoot-through and inductor saturation.
Can the ISL85005FRZ-T be used with internal compensation only?
Yes, the ISL85005FRZ-T supports internal compensation by connecting the COMP pin (pin 5) directly to AGND (pin 6), eliminating the need for external RC networks in most applications. This configuration meets stability requirements for standard 3.3µH inductors and 47µF output capacitors. External compensation remains available by placing a network between COMP and FB for specialized transient response or EMI requirements - but internal compensation is validated and recommended for general-purpose use of the ISL85005FRZ-T.
ISL85005FRZ-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)
ISL85005FRZ-T FAQ
1.How can I place an order for ISL85005FRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85005FRZ-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 ISL85005FRZ-T reliable?
The price and inventory of ISL85005FRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85005FRZ-T is usually 5 days.
3.What payment methods are accepted for ISL85005FRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85005FRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85005FRZ-T?
ISL85005FRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85005FRZ-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 ISL85005FRZ-T?
For technical support, including ISL85005FRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85005FRZ-T requirements.
6.How does Aetrix verify that ISL85005FRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL85005FRZ-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 ISL85005FRZ-T meets industry standards.
7.What is the process for return or replacement of ISL85005FRZ-T?
All ISL85005FRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL85005FRZ-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 ISL85005FRZ-T part is unused and in its original packaging.
Return procedure for ISL85005FRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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