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Renesas ISL85005AFRZ
- Part No.:
- ISL85005AFRZ
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85005AFRZ.pdf
- Description:
- IC REG BUCK ADJ 5A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,257
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Product details
Overview
ISL85005AFRZ from Renesas Electronics is a monolithic synchronous buck regulator with integrated 5A/18V high-side and low-side MOSFETs, ±1% 0.8V feedback reference, fixed 500kHz switching frequency, and programmable soft-start via SS pin. It operates across 4.5V–18V input for 12V rail supplies, battery-powered systems, and point-of-load regulation in embedded computing.
For engineers reviewing the ISL85005AFRZ datasheet, ISL85005AFRZ pinout, ISL85005AFRZ application, or ISL85005AFRZ equivalent, key selection criteria include its forced CCM operation mode, internal compensation capability, 5A continuous output current, thermal shutdown at 165°C, and compatibility with standard 3mm×4mm DFN layouts requiring no external sync clock.
Technical Context
The ISL85005AFRZ implements current-mode control with internal slope compensation and a fixed 500kHz oscillator. Its error amplifier features 5.5MHz open-loop bandwidth and 70dB gain, enabling stable regulation of output voltages from 0.8V to VIN−losses using an external resistor divider on FB.
It integrates a 5V LDO (VDD) derived from VIN, supports internal or external loop compensation (COMP-to-AGND or COMP-to-FB), and delivers power-good signaling with 1.5ms rising-edge delay and 85% output threshold detection. Protection includes input UVLO (4.35V rising), VIN OVP (20V), high-side cycle-by-cycle OCP (7.8A), low-side forward/reverse OCP, 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 batteries and standard 5V/12V rails without external pre-regulation. |
| Output Current | 5A continuous - enables single-chip conversion for mid-power PoL applications up to 25W at 5V. |
| Switching Frequency | Fixed 500kHz - balances efficiency, size, and EMI; eliminates need for external sync clock circuitry. |
| Feedback Reference | 0.800V ±1% - sets precise output voltage via resistor divider; enables 1.2V–5V outputs with <1% tolerance. |
| Soft-Start Control | Programmable via SS pin - 3.5µA internal current source charges external capacitor; default 2.3ms if floating. |
| Thermal Protection | 165°C shutdown with 10°C hysteresis - prevents damage during overload or poor heatsinking; auto-recovery after cooldown. |
| Package Thermal Resistance | θJA = 41°C/W - requires minimal PCB copper area for thermal management in compact designs. |
Pinout & Package
ISL85005AFRZ uses a 12-pin 3mm×4mm Dual Flat No-Lead (DFN) package with exposed thermal pad (EPAD) for enhanced heat dissipation. The package is RoHS-compliant and rated for -40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SS) | Soft-start timing input | 3.5µA internal current source charges external capacitor; determines ramp time for controlled VOUT rise. |
| 2 (PG) | Open-drain power-good indicator | Asserts high ~1.5ms after VOUT reaches 85% of target; requires external pull-up to VDD or ≤5.5V rail. |
| 3 (EN) | Enable logic input | Active-high; device enabled when voltage exceeds 0.6V (with 100mV hysteresis); pulls down PHASE when disabled. |
| 4 (FB) | Voltage feedback node | Negative input to error amplifier; regulates output by comparing divided VOUT against 0.8V reference. |
| 5 (COMP) | Loop compensation node | Connect to AGND for internal compensation; connect RC network to FB for custom stability tuning. |
| 6 (AGND) | Analog ground reference | Return path for internal analog blocks; must be connected to system ground plane, not isolated from PGND. |
| 7,8 (PHASE) | Switch node | Drives external output inductor; connects internally to sources/drains of both MOSFETs; handles high di/dt transitions. |
| 9,10 (VIN) | Main power input | Supplies high-side gate driver and internal circuits; requires local ceramic decoupling to PGND. |
| 11 (VDD) | Internal LDO output | 5V regulated supply for core logic; connect 1µF capacitor to ground; tie directly to VIN if VIN is 3–5.5V. |
| 12 (BOOT) | Bootstrap supply | Floating gate drive supply for high-side MOSFET; requires 0.1µF capacitor between BOOT and PHASE. |
| (EPAD) PGND | Power ground / thermal pad | Source connection of low-side MOSFET and primary thermal path; must be soldered to large PCB ground plane with multiple vias. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A/18V FETs | Eliminates external MOSFETs and drivers; reduces BOM count and layout complexity for 5A PoL designs. |
| Programmable soft-start | Prevents inrush current and output overshoot during startup; configurable from 0.5ms to >10ms via SS capacitor. |
| Internal bootstrap diode | Removes need for external bootstrap diode; simplifies layout and improves reliability in high-density applications. |
| Comprehensive protection suite | Covers input UVLO/OVP, output OVP, high/low-side OCP (forward/reverse), and thermal shutdown - enables robust operation without external monitoring. |
| Forced CCM only operation | Ensures consistent ripple and predictable EMI profile across full load range; avoids light-load mode transitions. |
Applications
| Network Power Conversion | Battery-Powered Edge Devices |
|---|---|
Use Scenario: Converting 12V backplane supply to 3.3V/1.8V for FPGA I/O banks and SerDes transceivers in enterprise switches. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering clean, regulated voltage with fast transient response and tight DC accuracy. Use Value: Enables reliable operation under dynamic load steps up to 5A/µs while maintaining <±1% output regulation and <2% peak deviation. | Use Scenario: Powering ARM-based industrial IoT gateways powered by 3S Li-ion packs (9–12.6V). IC Role / Device Role / Timing Role: Main system regulator converting variable battery voltage to stable 5V/3.3V for MCU, radio, and sensor subsystems. Use Value: Wide 4.5–18V input range accommodates full battery discharge curve; 5A capability supports simultaneous LTE+Wi-Fi transmission bursts. |
| Embedded Computing Power Rails | Multifunction Printer Engine Control |
Use Scenario: Generating 1.2V core voltage for dual-core Cortex-A53 SoC in fanless edge compute modules. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in forced CCM to ensure low-noise, ripple-controlled supply for sensitive digital cores. Use Value: Fixed 500kHz frequency and internal compensation simplify design; 92% peak efficiency at 1.2V/3A reduces thermal load in sealed enclosures. | Use Scenario: Supplying 5V/3.3V to motor drivers, ASICs, and imaging sensors in compact MFP mainboards. IC Role / Device Role / Timing Role: Compact, thermally efficient regulator replacing discrete solutions in space-constrained printer power sections. Use Value: 3mm×4mm DFN package with EPAD allows direct mounting to heatsink; programmable soft-start prevents mechanical actuator jerk during power-on. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL85005FRZ | Includes SYNC/MODE pin for external clock synchronization and Diode Emulation Mode (DEM); lacks programmable soft-start. | Suitable where EMI reduction via spread-spectrum sync or light-load efficiency optimization is required. | Select ISL85005FRZ if system-level clock alignment or DEM operation is needed; ISL85005AFRZ is preferred for fixed-frequency simplicity and controlled startup. |
| MP2451DT-LF-Z | 3A rated, 2MHz max switching frequency, no integrated soft-start pin, different pinout and compensation architecture. | Targeted at smaller loads and higher-frequency designs where size outweighs current capability. | Choose MP2451DT-LF-Z only for sub-3A applications with strict board area constraints; ISL85005AFRZ provides 67% higher current and dedicated soft-start control. |
Compared with ISL85005FRZ, ISL85005AFRZ trades sync flexibility and DEM for guaranteed forced CCM stability and precise startup control; versus MP2451DT-LF-Z, it delivers higher current, superior thermal performance, and application-specific feature integration in the same footprint.
Availability
ISL85005AFRZ is available at Aetrix Electronics and suitable for network infrastructure power conversion, battery-powered edge devices, and embedded computing systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL85005AFRZ 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 applications.
The ISL85005AFRZ belongs to Renesas' ISL8500x family of monolithic synchronous buck regulators, designed specifically for high-current, space-constrained point-of-load applications demanding integrated FETs, robust protection, and simplified layout.
FAQ
What is the maximum continuous output current supported by the ISL85005AFRZ?
The ISL85005AFRZ supports a maximum continuous output current of 5A, as confirmed by its integrated 5A/18V high-side and low-side MOSFETs and validated across the full -40°C to +125°C junction temperature range. This rating assumes proper PCB thermal design with adequate copper area and via count on the EPAD. Derating applies above 85°C ambient per thermal resistance data in the datasheet.
Does the ISL85005AFRZ require an external clock signal to operate?
No, the ISL85005AFRZ does not require an external clock signal. It features a fixed internal oscillator set to 500kHz, enabling standalone operation without synchronization circuitry. Unlike the ISL85005FRZ variant, the ISL85005AFRZ omits the SYNC pin entirely and is not capable of external frequency synchronization.
How is soft-start configured on the ISL85005AFRZ?
Soft-start on the ISL85005AFRZ is configured via the SS pin (Pin 1), which sources a precise 3.5µA current to charge an external capacitor to ground. The resulting ramp time determines VOUT rise duration; a 0.022µF capacitor yields ~2.3ms default startup. Floating the SS pin retains this default, while larger capacitors extend soft-start linearly - e.g., 0.1µF gives ~10.5ms.
What protection features are built into the ISL85005AFRZ?
The ISL85005AFRZ integrates input UVLO (4.35V rising), VIN overvoltage protection (20V), output overvoltage detection, high-side cycle-by-cycle current limit (7.8A), low-side forward/reverse overcurrent protection, and thermal shutdown at 165°C with 10°C hysteresis. All protections are fully autonomous and require no external components to activate.
Can the ISL85005AFRZ operate in discontinuous conduction mode (DCM)?
No, the ISL85005AFRZ operates exclusively in forced continuous conduction mode (FCCM) across all load conditions. Unlike the ISL85005FRZ, it does not support Diode Emulation Mode (DEM) or automatic mode switching. This ensures consistent ripple frequency and amplitude, simplifying EMI filtering and control loop design.
ISL85005AFRZ 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)
ISL85005AFRZ FAQ
1.How can I place an order for ISL85005AFRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85005AFRZ 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 reliable?
The price and inventory of ISL85005AFRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85005AFRZ is usually 5 days.
3.What payment methods are accepted for ISL85005AFRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85005AFRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85005AFRZ?
ISL85005AFRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85005AFRZ 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?
For technical support, including ISL85005AFRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85005AFRZ requirements.
6.How does Aetrix verify that ISL85005AFRZ is sourced from the original manufacturer or authorized distributors?
All ISL85005AFRZ 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 meets industry standards.
7.What is the process for return or replacement of ISL85005AFRZ?
All ISL85005AFRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL85005AFRZ, 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 part is unused and in its original packaging.
Return procedure for ISL85005AFRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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