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Renesas ISL8500IRZ
- Part No.:
- ISL8500IRZ
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL8500IRZ.pdf
- Description:
- IC REG BUCK ADJ 2A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:675
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Product details
Overview
ISL8500IRZ from Intersil is a 2A standard buck PWM regulator with integrated N-channel power MOSFET and internal 5V LDO, operating from 5.5V–25V input or fixed 5V ±10%, delivering adjustable 0.6V–19V output at up to 2A continuous current with ±1% VFB tolerance, fixed 500kHz switching frequency, and PGOOD monitoring - used in WLAN cards, LCD panels, and handheld instruments.
For engineers reviewing the ISL8500IRZ datasheet, ISL8500IRZ pinout, ISL8500IRZ application, or ISL8500IRZ equivalent, this page delivers verified technical context, validated pin functions, real-world application constraints, and confirmed alternative options for point-of-load DC/DC design in space-constrained embedded systems.
Technical Context
The ISL8500IRZ implements voltage-mode control with input voltage feed-forward, enabling stable regulation across wide VIN ranges while simplifying loop compensation. Its error amplifier features 88dB open-loop gain and 15MHz GBWP, supporting external RC network tuning via COMP/FB pins.
It integrates a lossless overcurrent protection scheme monitoring rDS(ON) of the internal 120–200mΩ N-MOSFET, with 3.5A current limit threshold and 100ns blanking time. Thermal shutdown activates at +150°C with +15°C hysteresis, and undervoltage protection triggers when FB falls 25% below 0.6V reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - supports FPGA core rails and wireless chipset loads without external current boosting. |
| Input Voltage Range | 5.5V–25V (unregulated) or 5V ±10% (regulated) - enables direct battery or system rail operation with no external bias supply needed. |
| Output Voltage Range | 0.6V–19V adjustable - covers logic I/O, analog subsystems, and intermediate bus voltages with single-resistor-divider programming. |
| Switching Frequency | Fixed 500kHz (450–550kHz min/max) - balances efficiency, EMI, and inductor size for compact PCB layouts. |
| VFB Tolerance | ±1% (0.594–0.606V) - ensures tight output regulation under load and line variation for sensitive digital loads. |
| Thermal Protection | +150°C shutdown with +15°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| rDS(ON) | 120–200mΩ (typ. 120mΩ at 100mA) - defines conduction loss and thermal rise at full 2A load in DFN package. |
| PGOOD Threshold | 85–91% (falling), 108–116% (rising) of nominal VOUT - provides reliable power sequencing and fault detection with 15mV hysteresis. |
Pinout & Package
ISL8500IRZ is housed in a thermally enhanced 12-lead 4mm × 3mm Dual Flat No-Lead (DFN) package with exposed thermal pad (L12.4x3 drawing). The EPAD must be soldered to GND for electrical and thermal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (1) | Inverting input of error amplifier | Connects to resistor divider to set output voltage; monitors regulation status for UV and PGOOD functions. |
| COMP (2) | Error amplifier output | External RC network here sets loop stability; directly drives PWM comparator input. |
| SS (3) | Soft-start ramp control | 30µA internal current source charges external capacitor; linear ramp overrides 0.6V reference during startup. |
| EN (4) | Enable logic input | Active-high enable with 1.2–2.2V threshold; pulls internal circuits into high-Z shutdown state when low. |
| PG (5) | Open-drain power-good indicator | Asserts low if VOUT deviates >12% from nominal or during soft-start; requires external 100kΩ pull-up to VDD. |
| GND (6) | Power and signal ground | Reference for all voltages; EPAD connection point for thermal dissipation and noise reduction. |
| VDD (7) | Internal 5V LDO output | Bias supply for control circuitry; can accept external 5V input when tied to VIN (bypass mode). |
| BOOT (8) | Floating gate drive supply | Charged via external capacitor to PHASE; enables high-side N-MOSFET gate drive above VIN. |
| PHASE (9,10) | Switch node | Connects to MOSFET source, inductor, and Schottky diode cathode; carries high dv/dt switching waveform. |
| VIN (11,12) | Main input power supply | Dual-pin configuration reduces IR drop and improves current sharing; decoupled with ≥10µF ceramic cap. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated N-channel power MOSFET | Eliminates external high-side switch; 120–200mΩ rDS(ON) enables self-contained 2A buck solution in 12LD DFN. |
| Voltage-mode control with feed-forward | Rejects input ripple without complex compensation; simplifies feedback design using standard Type-II/III networks. |
| Externally adjustable soft-start | Capacitor on SS pin sets startup time (TSS ≈ 50·CSS); prevents inrush current and output overshoot. |
| Comprehensive protection suite | Includes cycle-by-cycle OCP (3.5A threshold), thermal shutdown (+150°C), UV lockout (75% VOUT), and hiccup-mode recovery. |
| Integrated boot diode | Reduces external component count; eliminates need for discrete bootstrap diode in typical layout. |
| Pgood with window comparator | Monitors VOUT continuously with ±12% window; asserts open-drain low on fault, enabling safe power sequencing. |
Applications
| WLAN PCMCIA Card Power | LCD Panel Bias Supply |
|---|---|
Use Scenario: Powering RF transceivers and baseband processors on mini-PCI and CompactFlash form-factor WLAN cards requiring clean, sequenced 1.2V/1.8V/2.5V rails. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated core voltage with PGOOD signaling for host controller power sequencing. Use Value: Integrated MOSFET and 500kHz operation minimize footprint and EMI, enabling compliance with PCMCIA mechanical envelope and thermal limits. |
Use Scenario: Generating adjustable 3.3V–5V bias for TFT-LCD source/gate drivers and timing controllers in portable displays. IC Role / Device Role / Timing Role: Adjustable-output buck converter delivering stable mid-rail voltage with soft-start to prevent display flicker during power-on. Use Value: 0.6V–19V output range and ±1% VFB tolerance ensure accurate panel voltage setting across temperature and load variation. |
| Hand-Held Instrument Core Rail | Set-Top Box SoC Power |
Use Scenario: Supplying 1.2V core voltage to ARM-based microcontrollers and ADCs in battery-powered test equipment with strict quiescent current requirements. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with 80µA shutdown current and enable-controlled power gating. Use Value: 5.5V–25V input range accepts 2S/3S Li-ion or wall adapter inputs; thermal protection prevents overheating in sealed enclosures. |
Use Scenario: Delivering 1.1V–1.3V core voltage to MPEG decoder SoCs in consumer set-top boxes with burst-mode video processing loads. IC Role / Device Role / Timing Role: Fast-transient buck regulator with hiccup-mode OCP and PGOOD for system-level fault reporting and reset coordination. Use Value: 2A capability and 500kHz switching support rapid load steps up to 1.5A/ns without output droop exceeding 3%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2307DN-LF-Z | 3A rated, 340kHz fixed frequency, no integrated BOOT diode, requires external bootstrap diode. | Higher current but lower switching frequency increases inductor size; lacks integrated boot diode, adding BOM count. | Choose MP2307DN-LF-Z only if >2A output or cost-driven BOM optimization outweighs layout simplicity and thermal performance of ISL8500IRZ. |
| TPS54202DRCT | 2A, 4.5–17V input, 500kHz, integrated FETs (high/low side), no external diode required, but larger 10-pin WSON package. | Eliminates external Schottky diode; wider VIN range than ISL8500IRZ's 5.5–25V but excludes 5V-only mode. | Prefer TPS54202DRCT when diode elimination and tighter input regulation are critical, accepting larger footprint and different thermal profile. |
Compared with MP2307DN-LF-Z and TPS54202DRCT, the ISL8500IRZ uniquely combines 5V ±10% input compatibility, integrated boot diode, and 12LD DFN thermal performance - making it optimal for compact, dual-input (battery/rail) designs where board area and startup reliability are prioritized over maximum current headroom.
Availability
ISL8500IRZ is available at Aetrix Electronics and suitable for WLAN card power, LCD panel bias, and handheld instrument core rail applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL8500IRZ 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
Intersil (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, communications, and computing markets.
The ISL8500IRZ belongs to Intersil's standard buck regulator product line, designed specifically for compact, high-efficiency point-of-load conversion in space-constrained embedded systems with mixed input sources.
FAQ
What input voltage configurations does the ISL8500IRZ support?
The ISL8500IRZ supports two distinct input modes: a fixed 5V ±10% supply applied to both VIN and VDD pins (bypassing the internal LDO), or a variable 5.5V–25V unregulated source applied only to VIN (with VDD powered by the internal 5V LDO). This dual-mode flexibility allows seamless integration into battery-powered and system-rail architectures without redesign. The ISL8500IRZ datasheet specifies absolute max ratings up to 26V on VIN and 33V on BOOT-to-GND.
How is output voltage programmed on the ISL8500IRZ?
Output voltage on the ISL8500IRZ is set using an external resistor divider from VOUT to GND, with the FB pin connected to the divider midpoint. The formula is R4 = R1 × (VOUT − 0.6V) / 0.6V, where R1 is typically 1kΩ–10kΩ. The internal 0.6V reference has ±1% tolerance, ensuring precise regulation. For 0.6V output, R4 is omitted. The ISL8500IRZ supports outputs up to 19V, provided thermal limits (TJ ≤ +125°C) are maintained via proper PCB copper area and airflow.
Does the ISL8500IRZ require an external Schottky diode?
Yes, the ISL8500IRZ requires an external Schottky diode connected between PHASE and GND (cathode to PHASE, anode to GND) to complete the buck power path. The datasheet explicitly recommends Schottky over standard diodes for reduced forward voltage and improved efficiency. While the ISL8500IRZ integrates a bootstrap diode, it does not integrate the freewheeling diode - a key distinction from synchronous buck regulators. This requirement is confirmed in the Functional Block Diagram, Typical Application Schematic (Figure 1), and Pin Descriptions section of the ISL8500IRZ datasheet.
What protection features are built into the ISL8500IRZ?
The ISL8500IRZ integrates overcurrent protection (OCP) with 3.5A threshold and 100ns blanking, thermal shutdown at +150°C with +15°C hysteresis, output undervoltage protection (UVP) triggering at 75% of nominal VOUT, and power-good (PG) monitoring with ±12% window. All protections enter hiccup-mode recovery: after fault detection, the ISL8500IRZ disables switching for four soft-start cycles before attempting restart. This behavior is documented in the Protection Features section (pages 11–12) and Electrical Specifications table (page 5) of the ISL8500IRZ datasheet.
Can the ISL8500IRZ operate without an external soft-start capacitor?
No - the ISL8500IRZ requires an external capacitor from SS pin to GND to control startup behavior. Without it, the internal 30µA current source has no capacitance to charge, causing uncontrolled voltage ramp and potential output overshoot or instability. The soft-start time is calculated as TSS ≈ 50 × CSS (in µF), yielding ~10ms for a 0.22µF capacitor. This requirement is specified in the Pin Descriptions (page 6), Detailed Description (page 10), and Application Guidelines (page 12) of the ISL8500IRZ datasheet.
ISL8500IRZ 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):
- 25V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 19V
- Current - Output:
- 2A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
ISL8500IRZ FAQ
1.How can I place an order for ISL8500IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8500IRZ 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 ISL8500IRZ reliable?
The price and inventory of ISL8500IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8500IRZ is usually 5 days.
3.What payment methods are accepted for ISL8500IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8500IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8500IRZ?
ISL8500IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8500IRZ 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 ISL8500IRZ?
For technical support, including ISL8500IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8500IRZ requirements.
6.How does Aetrix verify that ISL8500IRZ is sourced from the original manufacturer or authorized distributors?
All ISL8500IRZ 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 ISL8500IRZ meets industry standards.
7.What is the process for return or replacement of ISL8500IRZ?
All ISL8500IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL8500IRZ, 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 ISL8500IRZ part is unused and in its original packaging.
Return procedure for ISL8500IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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