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Renesas ISL85001IRZ-T
- Part No.:
- ISL85001IRZ-T
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85001IRZ-T.pdf
- Description:
- IC REG BUCK ADJ 1A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,132
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Product details
Overview
ISL85001IRZ-T from Renesas Electronics is a 1A standard buck PWM regulator with integrated N-channel power MOSFET and internal 5V LDO bias supply, operating from 5.5V–25V input or fixed 5V ±10%, delivering adjustable 0.6V–19V output at up to 1A continuous current with ±1% VFB tolerance and fixed 500kHz switching frequency - used in WLAN cards, LCD panels, and handheld instruments.
For engineers reviewing the ISL85001IRZ-T datasheet, ISL85001IRZ-T pinout, ISL85001IRZ-T application, or ISL85001IRZ-T equivalent, key selection considerations include its integrated power switch (rDS(ON) = 120–200 mΩ), voltage-mode control with input feed-forward, external soft-start programmability, PGOOD open-drain output, and thermal/overcurrent/undervoltage protection architecture.
Technical Context
The ISL85001IRZ-T implements a single-loop voltage-mode PWM controller with input voltage feed-forward for improved line regulation and simplified loop compensation. Its error amplifier features 88dB open-loop gain and 15MHz gain-bandwidth product, supporting stable operation with external RC networks across COMP and FB pins.
It integrates an N-channel power MOSFET with lossless current sensing via rDS(ON) monitoring, triggering overcurrent shutdown at 1.7A nominal threshold with 100ns blanking time. Thermal protection activates at +150°C junction temperature with 20°C hysteresis, forcing hiccup-mode recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 1A continuous - supports compact point-of-load designs without external power stage components. |
| Input Voltage Range | 5.5V–25V (unregulated) or 5V ±10% (regulated) - enables direct battery or rail-sourced operation with internal LDO biasing. |
| Output Voltage Range | 0.6V–19V adjustable via external resistor divider - accommodates FPGA core, I/O, and analog supply rails. |
| Switching Frequency | Fixed 500kHz (450–550kHz typical) - balances efficiency, size, and EMI; eliminates need for external frequency programming. |
| VFB Tolerance | ±1% (0.594–0.606V) - ensures tight output regulation accuracy across temperature and load conditions. |
| rDS(ON) | 120–200 mΩ at 100mA - defines conduction loss and thermal performance ceiling for 1A operation in DFN package. |
| Protection Features | Overcurrent (1.7A threshold), undervoltage lockout (75% VOUT trip), thermal shutdown (+150°C), and PGOOD monitoring - enables robust self-protected operation without external supervision circuitry. |
Pinout & Package
ISL85001IRZ-T is housed in a RoHS-compliant 12-lead 4mm × 3mm Dual Flat No-Lead (DFN) package with exposed thermal pad (L12.4x3 drawing). The package provides low θJA = 39°C/W and θJC = 3°C/W for efficient heat dissipation in space-constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Feedback input | Inverting input of error amplifier; sets output voltage via external resistor divider referenced to 0.6V internal reference. |
| COMP | Error amplifier output | Provides access to compensation node; external RC network stabilizes voltage-mode loop with feed-forward. |
| SS | Soft-start control | 30µA internal current source charges external capacitor to linearly ramp output during startup; prevents inrush. |
| EN | Enable input | Active-high logic input (1.2–2.2V threshold); holds regulator off when pulled low, reducing supply current to 100µA. |
| PG | Power-good indicator | Open-drain output pulled low during soft-start, fault, or when VOUT deviates >12% from nominal - enables system sequencing. |
| GND | Ground reference | Common return for IC logic, power stage, and thermal relief; exposed pad must be soldered to PCB ground plane. |
| VDD | Internal LDO output | 5.0V ±0.5V regulated supply for internal circuitry; requires ≥1µF ceramic decoupling; tied to VIN for 5V input mode. |
| BOOT | Bootstrap supply | Floating gate drive supply for internal N-MOSFET; requires external capacitor between BOOT and PHASE nodes. |
| PHASE | Switch node | Connection to internal MOSFET source, external inductor, and Schottky diode cathode - carries high dv/dt switching waveform. |
| VIN | Main input supply | Primary power input for PWM stage and LDO input; requires 10µF ceramic decoupling close to pin; dual-pin layout reduces impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated N-channel power MOSFET | Eliminates external high-side switch; rDS(ON) optimized for 1A operation with minimal board area and BOM count. |
| Voltage-mode control with feed-forward | Reduces sensitivity to input voltage variation and simplifies loop compensation design versus current-mode alternatives. |
| Externally adjustable soft-start | Capacitor-programmable startup ramp prevents output overshoot and inrush current into downstream capacitance. |
| Integrated boot diode | Reduces external component count by eliminating discrete bootstrap diode; improves reliability and layout simplicity. |
| Comprehensive protection suite | Single-chip solution includes overcurrent, thermal, undervoltage, and power-good monitoring - no external fault management needed. |
Applications
| WLAN PCMCIA Cards | LCD Panel Power |
|---|---|
Use Scenario: Powering RF transceivers and baseband processors on compact PCMCIA-format wireless adapters. IC Role / Device Role / Timing Role: Primary DC-DC buck regulator providing stable 1.2V/1.8V/3.3V core and I/O supplies from 5V or battery input. Use Value: Integrated MOSFET and 500kHz operation enable <50mm² total solution size while maintaining >85% efficiency at 1A load. |
Use Scenario: Generating bias voltages for TFT-LCD source/gate drivers and timing controllers in portable displays. IC Role / Device Role / Timing Role: Adjustable-output buck converter delivering 2.5V–5V rails with tight regulation under dynamic backlight dimming loads. Use Value: ±1% VFB tolerance and PGOOD output ensure display stability and enable safe power sequencing with microcontroller coordination. |
| Handheld Instruments | Set-Top Box SoC Supplies |
Use Scenario: Supplying mixed-signal subsystems (ADCs, DACs, op-amps) in battery-powered test equipment with variable input voltage. IC Role / Device Role / Timing Role: Single-chip 1A buck regulator operating from 5.5V–25V input range, supporting both Li-ion and wall adapter sources. Use Value: Wide input range and thermal protection allow reliable operation across ambient temperatures from –40°C to +85°C without derating. |
Use Scenario: Providing auxiliary 1.2V/1.8V rails for video processing SoCs in consumer set-top boxes with constrained board space. IC Role / Device Role / Timing Role: Secondary buck regulator complementing main PMIC, delivering clean, low-noise power with hiccup-mode fault recovery. Use Value: Integrated overcurrent and undervoltage protection eliminate need for external supervisor ICs, reducing system-level BOM cost. |
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, 36V max input, current-mode control, no integrated boot diode, requires external bootstrap diode. | Higher input voltage capability suits industrial 24V systems; current-mode offers faster transient response but needs more complex compensation. | Select when >25V input or faster load step response is required; verify external diode placement and loop stability. |
| TPS54202DRCT | 2A rated, 6V–18V input, current-mode control, integrated FETs (no external diode), 500kHz fixed frequency, smaller 3mm × 2mm WSON package. | Better suited for higher-current, lower-input-voltage applications; lacks 5V ±10% fixed-input mode and integrated boot diode. | Prefer for 12V-rail systems needing >1A or tighter footprint; confirm compatibility with 0.6V feedback reference and PGOOD timing. |
Compared with MP2307DN-LF-Z and TPS54202DRCT, the ISL85001IRZ-T uniquely supports dual-input configurations (5V ±10% or 5.5V–25V), includes an integrated boot diode, and delivers verified 1A performance in a thermally enhanced 4mm×3mm DFN - making it optimal for compact, multi-rail, battery-aware designs where simplicity and thermal margin are prioritized over peak current or ultra-wide VIN.
Availability
ISL85001IRZ-T is available at Aetrix Electronics and suitable for WLAN cards, LCD panels, and handheld instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL85001IRZ-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 connectivity solutions for automotive, industrial, and IoT applications.
The ISL85001IRZ-T belongs to Renesas' ISL85xx family of integrated buck regulators, designed specifically for space-constrained, cost-sensitive point-of-load applications requiring high integration, robust protection, and simplified design-in.
FAQ
What input voltage configurations does the ISL85001IRZ-T support?
The ISL85001IRZ-T supports two distinct input modes: a fixed 5V ±10% supply applied to both VIN and VDD pins, or a variable 5.5V–25V unregulated input applied only to VIN while VDD supplies internal 5V bias. This dual-mode flexibility allows seamless integration across battery-powered and rail-sourced systems without redesigning the power stage. The ISL85001IRZ-T automatically configures its internal LDO based on the connection scheme.
How is output voltage programmed on the ISL85001IRZ-T?
Output voltage is set using an external resistor divider connected between VOUT, FB, and GND, referencing the ISL85001IRZ-T's internal 0.6V feedback reference. The formula R4 = R1 × (VOUT/0.6V − 1) determines the upper resistor value, with R1 typically 1kΩ–10kΩ. For 0.6V output, R4 is omitted. The ISL85001IRZ-T supports outputs from 0.6V to 19V, though thermal limits apply above 2.7V without preload.
Does the ISL85001IRZ-T require an external Schottky diode?
Yes, the ISL85001IRZ-T requires an external Schottky diode connected from PHASE to GND to complete the buck power path. While it integrates a boot diode for gate drive, the power rectification path remains external. A Schottky diode (e.g., B340LB) is recommended to minimize forward voltage drop and conduction losses, directly impacting efficiency and thermal performance at 1A load.
What protection features are built into the ISL85001IRZ-T?
The ISL85001IRZ-T integrates overcurrent protection (1.7A threshold with 100ns blanking), thermal shutdown (+150°C with 20°C hysteresis), undervoltage lockout (75% VOUT trip), and PGOOD monitoring. These functions operate autonomously - no external components are needed. Faults trigger hiccup-mode recovery, and the ISL85001IRZ-T resumes normal soft-start after cooling or fault clearance.
Can the ISL85001IRZ-T operate without an external soft-start capacitor?
No - the ISL85001IRZ-T requires an external capacitor from SS to GND to control startup behavior. The internal 30µA current source charges this capacitor to generate a linear ramp that overrides the 0.6V reference during soft-start. Omitting the capacitor causes immediate full-output assertion, risking inrush current, output overshoot, and potential damage to downstream capacitors or loads. The ISL85001IRZ-T datasheet specifies tSS ≈ 50 × CSS (µF) in seconds.
ISL85001IRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for ISL85001IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85001IRZ-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 ISL85001IRZ-T reliable?
The price and inventory of ISL85001IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85001IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL85001IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85001IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85001IRZ-T?
ISL85001IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85001IRZ-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 ISL85001IRZ-T?
For technical support, including ISL85001IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85001IRZ-T requirements.
6.How does Aetrix verify that ISL85001IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL85001IRZ-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 ISL85001IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL85001IRZ-T?
All ISL85001IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL85001IRZ-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 ISL85001IRZ-T part is unused and in its original packaging.
Return procedure for ISL85001IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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