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Renesas ISL85001IRZ
- Part No.:
- ISL85001IRZ
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85001IRZ.pdf
- Description:
- IC REG BUCK ADJ 1A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:598
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Product details
Overview
ISL85001IRZ from Renesas Electronics is a 1A standard buck PWM regulator with integrated N-channel power MOSFET, fixed 500kHz switching frequency, ±1% VFB reference tolerance (0.6V), and internal 5V LDO bias regulator. It delivers adjustable output from 0.6V to 19V across 5.5V–25V or 5V±10% input, supporting point-of-load power for FPGA and wireless chipset applications.
For engineers reviewing the ISL85001IRZ datasheet, ISL85001IRZ pinout, ISL85001IRZ application, or ISL85001IRZ equivalent, this page provides verified technical context, validated pin functions, confirmed protection features (OCP, UVP, thermal shutdown), real-world soft-start behavior, and direct alternative part comparisons - all grounded in FN6769 Rev.3.00 specifications.
Technical Context
The ISL85001IRZ implements voltage-mode control with input voltage feed-forward, enabling stable regulation under wide VIN variation while simplifying loop compensation. Its error amplifier features 88dB open-loop gain and 15MHz GBWP, with COMP pin allowing external network tuning for phase margin optimization.
It integrates a lossless current-limit scheme monitoring rDS(ON) of the internal MOSFET (120–200mΩ), triggering hiccup-mode shutdown after eight consecutive overcurrent cycles at 1.7A nominal threshold. Thermal protection activates at +150°C junction temperature with 20°C hysteresis, forcing shutdown until cooling below +130°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Continuous 1A load capability with internal MOSFET optimized for thermal performance in DFN package. |
| Input Voltage Range | 5.5V–25V (VIN-only) or 5V±10% (VIN+VDD tied); supports unregulated battery and regulated rail inputs. |
| Output Voltage Range | 0.6V to 19V via external resistor divider; 0.6V reference with ±1% tolerance ensures tight regulation accuracy. |
| Switching Frequency | Fixed 500kHz (450–550kHz typical range); enables compact magnetics and predictable EMI profile. |
| Protection Features | Integrated overcurrent (1.7A threshold), undervoltage lockout (75% VOUT trip), and thermal shutdown (+150°C). |
| Soft-Start Control | Externally adjustable via SS pin; 30µA internal current source charges capacitor to set ramp time linearly. |
| Power-Good Output | Open-drain PG pin asserts low when VOUT deviates >12% from nominal or during soft-start/fault conditions. |
Pinout & Package
ISL85001IRZ uses a 12-lead 4mm × 3mm Dual Flat No-Lead (DFN) package with exposed thermal pad (EPAD) requiring GND connection for thermal relief and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Inverting input to error amplifier | Sets output voltage via resistor divider; also used by PG and UVP circuits to monitor regulation status. |
| COMP (Pin 2) | Error amplifier output | Connects external compensation network (RC across COMP–FB) to stabilize voltage-mode loop. |
| SS (Pin 3) | Soft-start ramp input | 30µA internal current source charges external capacitor; output ramps linearly to control startup slew rate. |
| EN (Pin 4) | Enable logic input | Active-high enable with 1.7V threshold; pulls internal devices into high-Z state when low, reducing supply current to 100µA. |
| PG (Pin 5) | Power-good open-drain output | Indicates regulation status; requires external 100kΩ pull-up to VDD; low during fault, soft-start, or disable. |
| GND (Pin 6) | Ground reference & thermal pad | Primary ground return and thermal path; EPAD must be soldered to PCB GND plane for thermal performance. |
| VDD (Pin 7) | Internal 5V LDO output | Bias supply for internal logic; supplies 4.5–5.5V at up to 30mA; requires ≥1µF ceramic decoupling to GND. |
| BOOT (Pin 8) | Bootstrap supply for gate driver | Charges external bootstrap capacitor (BOOT–PHASE) to drive internal N-MOSFET gate above PHASE potential. |
| PHASE (Pins 9,10) | Switch node connection | Connects to internal MOSFET source, external inductor, and Schottky diode cathode; carries high dv/dt switching waveform. |
| VIN (Pins 11,12) | Main input supply | Supplies power stage and LDO; requires ≥10µF ceramic decoupling close to pins; dual pins reduce impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated N-channel power MOSFET | rDS(ON) = 120–200mΩ enables 1A continuous operation without external switch, reducing BOM count and layout area. |
| Voltage-mode control with feed-forward | Rejects input line variation directly in modulation stage, relaxing output filter requirements and improving transient response. |
| Programmable soft-start | Linear ramp via external capacitor on SS pin prevents inrush current and allows controlled sequencing with other rails. |
| Comprehensive fault protection | Hiccup-mode OCP (1.7A), UVP (75% VOUT), and thermal shutdown (+150°C) protect IC and system under sustained overload. |
| Power-good signaling | PG pin provides system-level power sequencing feedback with ±12% window detection and fast propagation delay (9µs). |
Applications
| WLAN Card Power Supply | FPGA Core Voltage Regulation |
|---|---|
Use Scenario: Powering MiniPCI, PCMCIA, or CompactFlash cards in embedded wireless modules. IC Role / Device Role / Timing Role: Primary DC/DC converter generating stable 1.2V–3.3V core or I/O rail from 5V or 12V board supply. Use Value: Integrated MOSFET and 500kHz operation minimize solution size; ±1% VFB ensures compliance with tight FPGA voltage tolerances. |
Use Scenario: Delivering configurable core voltage (e.g., 1.0V, 1.2V) to Xilinx or Intel FPGA banks during configuration and runtime. IC Role / Device Role / Timing Role: Point-of-load regulator responding to dynamic current demands with fast soft-start and hiccup-mode fault recovery. Use Value: 1A capability meets mid-range FPGA quiescent + transient loads; PG signal synchronizes configuration with power readiness. |
| LCD Panel Backlight Driver Support | Hand-Held Instrument Power Management |
Use Scenario: Providing bias voltage for LED driver ICs or analog front-end circuitry in portable LCD displays. IC Role / Device Role / Timing Role: Secondary regulated rail generator stepping down 5V/12V to 2.5V–5V for display interface logic and timing controllers. Use Value: Adjustable output (0.6V–19V) accommodates diverse panel requirements; thermal shutdown prevents overheating in confined enclosures. |
Use Scenario: Powering mixed-signal data acquisition circuits (ADCs, op-amps, microcontrollers) in battery-operated test equipment. IC Role / Device Role / Timing Role: Efficient, low-noise local regulator converting 5V USB or Li-ion battery output to precision analog rails. Use Value: 500kHz switching avoids audible noise; EN pin enables power gating between measurements to extend battery life. |
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 | 1.2A rated, 300kHz–2MHz adjustable frequency, no integrated boot diode, requires external bootstrap diode. | Supports higher-frequency designs and wider VIN (4.5–28V), but lacks internal LDO and requires additional components for boot circuit. | Choose MP2307DN-LF-Z when higher switching frequency or extended input range is required, and board space allows extra passive components. |
| TPS54202DRCT | 2A rated, 400kHz–2.5MHz adjustable frequency, integrated boot diode, 0.6V reference with ±1% tolerance, same 12-pin DFN package. | Higher current capacity and programmable frequency suit more demanding loads; identical footprint enables drop-in evaluation. | Choose TPS54202DRCT when 2A output or frequency flexibility is needed; pin compatibility allows rapid prototyping without layout change. |
Compared with ISL85001IRZ, MP2307DN-LF-Z offers broader frequency tuning but adds design complexity, while TPS54202DRCT provides higher current and pin-compatible upgrade path - both require validation of thermal performance and loop stability in target application.
Availability
ISL85001IRZ is available at Aetrix Electronics and suitable for WLAN card power supplies, FPGA core voltage regulation, LCD panel bias generation, and hand-held instrument power management requiring stable component supply and long-term industrial availability.
Supply support for ISL85001IRZ 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 high-performance analog, power, and embedded processing solutions for industrial, automotive, and communications markets.
The ISL85001IRZ belongs to Renesas' standard buck regulator product line, designed specifically for compact, cost-sensitive point-of-load applications where integration, thermal efficiency, and robust protection are critical.
FAQ
What input voltage ranges does the ISL85001IRZ support?
The ISL85001IRZ supports two distinct input configurations: 5.5V to 25V applied only to VIN (with internal 5V LDO powering VDD), or 5V ±10% applied simultaneously to both VIN and VDD pins to bypass the LDO. The recommended operating range is 4.5V to 25V, with absolute maximum VIN at 26V. This dual-mode design allows flexibility across battery-powered and fixed-rail systems without redesigning the power stage.
How does the ISL85001IRZ implement overcurrent protection?
The ISL85001IRZ uses a lossless current-sense method monitoring the rDS(ON) voltage drop across its internal N-channel MOSFET. When sensed current exceeds 1.7A (typical), it triggers an internal fault counter; after eight consecutive overcurrent cycles, the device enters hiccup-mode shutdown. Recovery occurs automatically after four soft-start intervals if the fault clears. A 100ns blanking time prevents false triggering from switching noise.
Can the ISL85001IRZ operate without an external Schottky diode?
No - the ISL85001IRZ requires an external Schottky diode connected between PHASE and GND to complete the buck power path. The IC integrates only the high-side N-channel MOSFET; the diode serves as the low-side rectifier. Using a Schottky diode (e.g., B340LB) is explicitly recommended in FN6769 for improved efficiency and reduced forward voltage drop versus standard PN diodes.
What is the function of the VDD pin on the ISL85001IRZ?
The VDD pin on the ISL85001IRZ is the output of an internal 5V LDO regulator that powers all internal control and protection circuitry. When VIN is ≥5.5V, VDD self-generates 4.5–5.5V (at up to 30mA). When using a 5V±10% input, VIN and VDD must be shorted to bypass the LDO. In both cases, a minimum 1µF ceramic capacitor must be placed between VDD and GND for stability and transient decoupling.
How is the soft-start time determined for the ISL85001IRZ?
The soft-start time for the ISL85001IRZ is set by an external capacitor connected from SS pin to GND, charged by an internal 30µA current source. The ramp time tSS (in seconds) approximates 50 × CSS (in µF), per Equation 1 in FN6769. For example, a 100nF capacitor yields ~5ms ramp. The output reaches regulation when SS voltage hits ~1.6V; full ramp to 3.0V defines total soft-start interval before PG assertion.
ISL85001IRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Last Time Buy
- 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:
- 1A
- 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)
ISL85001IRZ FAQ
1.How can I place an order for ISL85001IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85001IRZ 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 ISL85001IRZ reliable?
The price and inventory of ISL85001IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85001IRZ is usually 5 days.
3.What payment methods are accepted for ISL85001IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85001IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85001IRZ?
ISL85001IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85001IRZ 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 ISL85001IRZ?
For technical support, including ISL85001IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85001IRZ requirements.
6.How does Aetrix verify that ISL85001IRZ is sourced from the original manufacturer or authorized distributors?
All ISL85001IRZ 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 ISL85001IRZ meets industry standards.
7.What is the process for return or replacement of ISL85001IRZ?
All ISL85001IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL85001IRZ, 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 ISL85001IRZ part is unused and in its original packaging.
Return procedure for ISL85001IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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