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Renesas ISL8560IRZ-T
- Part No.:
- ISL8560IRZ-T
- Manufacturer:
- Renesas
- Package:
- 20-VQFN Exposed Pad
- Datasheet:
-
ISL8560IRZ-T.pdf
- Description:
- IC REG BUCK ADJ 2A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,648
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Product details
Overview
ISL8560IRZ-T from Renesas (formerly Intersil) is a non-synchronous buck DC/DC switching regulator with integrated 2A N-channel MOSFET, operating from 9.0V to 60V input and delivering adjustable output voltage from 1.21V to 55V. It features voltage feedforward control, 100–600kHz programmable switching frequency, 0.19Ω typical rDS(ON), and thermal shutdown. Used in industrial power supplies where wide-input, high-efficiency step-down conversion is required.
For engineers reviewing the ISL8560IRZ-T datasheet, ISL8560IRZ-T pinout, ISL8560IRZ-T application, or ISL8560IRZ-T equivalent, this page delivers verified technical context, validated pin functions, confirmed operating parameters, and real-world design implications - all specific to the ISL8560IRZ-T QFN-20 package with -40°C to +85°C temperature range.
Technical Context
The ISL8560IRZ-T implements voltage feedforward PWM control to reject input ripple and simplify loop compensation, using an internal transconductance error amplifier (5.7 mS typical gm, 15 MHz GBW) and external RC network on COMP for stability. Its oscillator is set via RTCT pin with resistor-to-VIN and capacitor-to-GND, supporting precise frequency tuning across 100–600kHz while maintaining ±10% total variation over VIN.
Protection architecture includes pulse-by-pulse current limiting (4.0A typical switch limit), hiccup-mode short-circuit recovery (4 soft-start cycles between attempts), and thermal shutdown at +150°C with +15°C hysteresis. The device supports zero-load operation and withstands 100V load dump for 400ms - critical for automotive and industrial transient resilience.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 9.0V to 60V - enables direct connection to 12V/24V/48V industrial buses and battery systems without pre-regulation. |
| Output Current | 2A continuous - sufficient for powering FPGAs, microcontrollers, and sensor subsystems in distributed power architectures. |
| rDS(ON) | 0.19Ω typical - reduces conduction loss and improves efficiency at high load, especially above 24V input. |
| Switching Frequency | 100kHz to 600kHz - allows trade-off between EMI control (lower f) and component size (higher f); SYNC pin enables system-level clock alignment. |
| Reference Voltage | 1.21V ±1% - sets precision output regulation floor; FB pin monitors scaled output to maintain tight VOUT accuracy across temperature. |
| Standby Current | 60µA typical - minimizes quiescent drain in always-on systems such as telematics or remote sensors. |
| Thermal Shutdown | +150°C rising threshold with +15°C hysteresis - prevents permanent damage during overload or poor heatsinking; auto-recovery after cooldown. |
Pinout & Package
ISL8560IRZ-T is housed in a thermally enhanced 20-lead 6mm × 6mm QFN package (L20.6x6B) with exposed thermal pad. Pin 13 (PGND) and the underside pad provide primary power ground return; SGND (Pin 8) isolates analog control ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX (Pins 1,2,15,16) | Power Switch Node | Four paralleled pins connect to external inductor and Schottky diode cathode; low-inductance routing essential for EMI and efficiency. |
| BOOT (Pin 3) | High-Side Gate Drive Supply | Connects to LX via bootstrap capacitor; enables gate drive above VIN for internal N-MOSFET; requires ceramic capacitor ≥0.1µF. |
| EN (Pin 4) | Enable Control Input | Active-low logic interface; internal pull-up holds disabled by default; tie to GND for automatic startup; 2.6V threshold ensures noise immunity. |
| VCC5 (Pin 5) | Internal LDO Output | Provides regulated 5.0V ±0.1V for internal circuitry; requires 1µF bypass capacitor to PGND; not intended for external loading. |
| SYNC (Pin 6) | External Clock Synchronization | TTL-compatible digital input; allows master-slave timing coordination in multi-rail systems; no duty cycle restrictions; open or GND when unused. |
| RTCT (Pin 7) | Oscillator Timing Interface | Resistor-to-VIN + capacitor-to-GND sets frequency; capacitor must be rated for full VIN; voltage swing varies 0.9–10V for feedforward stability. |
| SGND (Pin 8) | Analog Ground Reference | Return path for FB, COMP, REF, SS, and error amplifier; must be star-connected to PGND at single point to avoid noise coupling. |
| FB (Pin 9) | Feedback Input | Monitors resistive divider output; compares to 1.21V reference; determines final VOUT; bias current ±100nA enables high-resistor dividers. |
| COMP (Pin 10) | Error Amplifier Output | Connects external compensation network (RC/RCZ); gm = 5.7mS and 15MHz GBW define loop bandwidth and phase margin requirements. |
| REF (Pin 11) | Reference Output | 1.21V buffered reference; bypass with 0.01µF ceramic capacitor to SGND for noise rejection in precision feedback paths. |
| PGOOD (Pin 12) | Open-Drain Power-Good Flag | Asserts low when VOUT deviates >±10% from setpoint; includes 3µs noise filter; requires external pull-up for system monitoring or sequencing. |
| PGND (Pin 13) | Power Ground Return | Main return for LX, VIN, and internal MOSFET source; connects directly to PCB thermal pad; separates high-current paths from sensitive analog grounds. |
| SS (Pin 14) | Soft-Start Timing | 10µA internal current charges external capacitor; defines monotonic VOUT ramp time; supports pre-biased start-up with external diode clamp. |
| VIN (Pins 17–20) | Main Input Supply | Four paralleled inputs accept 9–60V; low-impedance connection to bulk input capacitors essential for handling 2A peak currents and minimizing voltage droop. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage Feedforward Regulation | Compensates for input line variations in real time, reducing output ripple and simplifying compensation design versus standard voltage-mode control. |
| Pulse-by-Pulse Current Limit | Monitors internal MOSFET current each cycle; limits peak switch current to ~4.0A to prevent avalanche failure during overload or short-circuit events. |
| Hiccup-Mode Short-Circuit Protection | After seven consecutive overcurrent faults, enters 4-soft-start-cycle recovery delay - limits average power dissipation and prevents thermal runaway. |
| Load Dump Withstand | Sustains 100V transient on VIN for 400ms - meets ISO 7637-2 Pulse 5a requirements for automotive 12V/24V systems without external clamping. |
| Zero-Load Operation | Maintains regulation with no output current; eliminates need for dummy loads in standby or sleep modes of industrial controllers and IoT edge nodes. |
Applications
| Industrial PLC Power Rails | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Providing stable 5V/12V rails from 24V vehicle battery to microcontroller, CAN transceivers, and sensor interfaces in BCMs. IC Role / Device Role / Timing Role: Primary buck regulator supplying core logic voltage; handles cold-crank (6.5V) and load-dump (100V) transients per ISO 7637-2. Use Value: Eliminates need for external TVS or pre-regulator stages due to 100V load-dump rating and wide 9–60V input range. |
Use Scenario: Generating isolated 3.3V and 5V supplies for I/O expansion cards and communication modules in modular PLC backplanes. IC Role / Device Role / Timing Role: Non-isolated step-down converter feeding downstream LDOs or DC/DCs; operates at 300kHz to avoid AM band interference. Use Value: Integrated 2A MOSFET and feedforward control enable compact, high-efficiency design with minimal external components and predictable thermal behavior. |
| Portable Test Equipment Power | Distributed Telecom Power |
|
Use Scenario: Converting 48V telecom rack supply to 12V intermediate bus for portable oscilloscopes and signal analyzers with battery backup. IC Role / Device Role / Timing Role: High-input buck stage enabling single-stage conversion from 48V to 12V; uses SYNC pin to align switching with system clock for EMI reduction. Use Value: 600kHz max frequency allows small magnetics; 60µA shutdown current extends battery runtime during idle periods. |
Use Scenario: Local 5V/3.3V conversion for remote radio units (RRUs) powered from centralized 48V DC plant in 5G base stations. IC Role / Device Role / Timing Role: Point-of-load regulator with thermal shutdown and hiccup protection; operates continuously in sealed, high-temperature enclosures. Use Value: +125°C junction rating and robust fault recovery ensure reliable operation under sustained 70°C ambient conditions without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QWRGERQ1 | Synchronous buck controller (no external diode needed); 3–65V input; 1A output; integrated high-side/low-side MOSFETs. | Better light-load efficiency and smaller solution size due to synchronous rectification; lacks 100V load-dump rating. | Select LM5164QWRGERQ1 when board space and light-load efficiency are prioritized over automotive transient robustness. |
| MPQ4312-AEC1 | 40V max input; 2A synchronous buck; AEC-Q100 Grade 1; 2.2MHz fixed frequency; integrated compensation. | Higher switching frequency enables smaller inductors; limited to 40V input - unsuitable for 48V industrial or truck applications. | Select MPQ4312-AEC1 for automotive infotainment or ADAS subsystems requiring AEC-Q100 qualification and compact layout, but not for 48–60V input rails. |
Compared with LM5164QWRGERQ1 and MPQ4312-AEC1, the ISL8560IRZ-T uniquely combines 60V input capability, 100V load-dump tolerance, and non-synchronous flexibility (enabling Schottky selection for cost/thermal optimization), making it optimal for ruggedized industrial and heavy-duty automotive power designs where input transients dominate reliability concerns.
Availability
ISL8560IRZ-T is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, portable test equipment, and distributed telecom power systems requiring stable component supply across extended temperature and high-transient environments.
Supply support for ISL8560IRZ-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 acquired Intersil in 2017 and maintains full support for legacy Intersil power management products including the ISL8560 family.
The ISL8560 product line was designed for high-voltage industrial and automotive DC/DC conversion where wide input range, transient resilience, and integrated MOSFET performance are critical - targeting applications beyond standard 5V/12V consumer-grade regulators.
FAQ
What is the maximum input voltage the ISL8560IRZ-T can withstand during transient events?
The ISL8560IRZ-T is rated to withstand 100V load-dump transients for up to 400ms, as specified in the datasheet. This capability meets ISO 7637-2 Pulse 5a requirements for 12V and 24V automotive systems. The absolute maximum VIN rating is 72V DC, but transient survival depends on proper input capacitance and layout - not just steady-state limits. Always verify transient response using Figure 27 (output short-circuit) and Figure 28 waveforms in FN9244 Rev 7.00 when designing for harsh environments.
Does the ISL8560IRZ-T require an external Schottky diode, and what are the key selection criteria?
Yes, the ISL8560IRZ-T is a non-synchronous buck regulator and requires an external Schottky diode connected from LX to PGND. Key selection criteria include reverse breakdown voltage ≥1.2× maximum VIN (e.g., ≥72V for 60V systems), forward voltage ≤0.7V at peak current, and RMS current rating ≥2A. Datasheet Figure 2 and Figure 3 recommend B2100; alternatives like SB560 or SS36 are viable if thermal and voltage margins are verified. Avoid standard PN diodes due to excessive reverse recovery losses.
How is the soft-start time determined for the ISL8560IRZ-T, and can it support pre-biased outputs?
The ISL8560IRZ-T soft-start time is set by an external capacitor on SS pin charged by a 10µA internal current source: tSS ≈ 8.3 × CSS (in µF). For example, 100nF yields ~0.83ms ramp. Pre-biased start-up is supported - Figure 25 shows successful soft-start with 4V pre-bias using an external diode clamp from SS to VOUT. This avoids negative current flow into already-powered downstream circuits, critical for hot-swap or multi-rail sequencing applications.
What is the purpose of the VCC5 pin on the ISL8560IRZ-T, and can it power external circuitry?
The VCC5 pin on the ISL8560IRZ-T provides a regulated 5.0V ±0.1V output derived from the internal LDO, intended solely for internal IC biasing. Datasheet Section "Pin Descriptions" explicitly states it is "not planned that the user would use this supply." It sources only 5mA maximum and lacks overcurrent or thermal protection. Using VCC5 to power external loads risks instability, dropout, or damage. Always use a dedicated LDO or DC/DC for auxiliary 5V rails.
How does the ISL8560IRZ-T implement voltage feedforward, and what design benefit does it provide?
The ISL8560IRZ-T implements voltage feedforward by scaling the oscillator ramp amplitude proportionally to VIN - varying from ~0.9V at 8.5V input to ~10V at 60V input. This directly compensates for input line variations in the PWM comparator, reducing output voltage deviation during fast VIN transients. As shown in Figure 16–19, feedforward enables <±0.5% VOUT regulation across 9–60V input at full load - eliminating the need for complex Type III compensation and improving transient response versus standard voltage-mode controllers.
ISL8560IRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-VQFN 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):
- 9V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.21V
- Voltage - Output (Max):
- 55V
- Current - Output:
- 2A
- Frequency - Switching:
- 100kHz ~ 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (6x6)
ISL8560IRZ-T FAQ
1.How can I place an order for ISL8560IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8560IRZ-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 ISL8560IRZ-T reliable?
The price and inventory of ISL8560IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8560IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL8560IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8560IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8560IRZ-T?
ISL8560IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8560IRZ-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 ISL8560IRZ-T?
For technical support, including ISL8560IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8560IRZ-T requirements.
6.How does Aetrix verify that ISL8560IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL8560IRZ-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 ISL8560IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL8560IRZ-T?
All ISL8560IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL8560IRZ-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 ISL8560IRZ-T part is unused and in its original packaging.
Return procedure for ISL8560IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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