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Renesas ISL80031FRZ-T
- Part No.:
- ISL80031FRZ-T
- Manufacturer:
- Renesas
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
ISL80031FRZ-T.pdf
- Description:
- IC REG BUCK ADJ 3A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,995
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Product details
Overview
ISL80031FRZ-T from Renesas (formerly Intersil) is a monolithic synchronous buck DC/DC converter optimized for high-efficiency, low-quiescent-current power delivery in space-constrained applications. It delivers up to 3A continuous output current from a 2.7V–5.5V input, operates at 1MHz switching frequency in PFM mode, achieves 35µA quiescent current, and integrates PMOS/NMOS power stages with 100% duty cycle capability - enabling use in battery-powered instrumentation and medical devices requiring ultra-low standby power.
For engineers reviewing the ISL80031FRZ-T datasheet, ISL80031FRZ-T pinout, ISL80031FRZ-T application, or ISL80031FRZ-T equivalent, this page provides verified technical context on its PFM light-load efficiency, integrated protection features (OCP, SCP, thermal shutdown), 8-pin 2mm×2mm DFN package constraints, and design-critical parameters including 0.600V feedback reference, 70mΩ/60mΩ MOSFET rDS(ON), and negative current limit of –2A.
Technical Context
The ISL80031FRZ-T uses peak current-mode control with pulse-skipping (PFM) operation to minimize switching losses at light loads, achieving 35µA quiescent current. Its internal architecture eliminates the need for an external bootstrap capacitor due to the integrated PMOS high-side switch.
It incorporates zero-cross sensing for skip-mode entry after 16 consecutive inductor current zero crossings, and includes dedicated comparators for overcurrent (3.6–5.4A trip), short-circuit (VFB < 0.3V), and thermal shutdown (150°C). The error amplifier features 40µA/V transconductance and internal 27pF/200kΩ compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 5.5V - supports single-cell Li-ion, USB, and industrial 3.3V/5V rails without external LDO pre-regulation. |
| Max Output Current | 3A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or sensor signal chains. |
| Switching Frequency | 1MHz (fixed) - enables use of compact 1.0–3.3µH inductors and reduces EMI filtering burden vs lower-frequency converters. |
| Quiescent Current | 35µA - extends battery life in always-on monitoring systems where load current drops below 10mA. |
| Feedback Voltage | 0.600V ±6mV - allows precise output regulation down to 0.8V using standard resistor dividers (e.g., 200kΩ/100kΩ for 1.8V). |
| MOSFET rDS(ON) | 70mΩ (HS PMOS), 60mΩ (LS NMOS) - minimizes conduction loss at full load, supporting >93% efficiency at 3A/1.8V out. |
| Duty Cycle Range | 0–100% - enables dropout operation (e.g., 3.3V→3.0V) without losing regulation, critical for brownout resilience. |
Pinout & Package
ISL80031FRZ-T is housed in an 8-lead 2mm×2mm DFN package with exposed thermal pad (EPAD), RoHS-compliant and MSL3 rated. The package enables <64mm² total solution area and requires direct connection of EPAD to PGND plane via multiple vias for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2) | Input power supply rail | Supplies both power stage and internal bias regulator; requires ≥10µF ceramic decoupling placed adjacent to pins. |
| EN (Pin 3) | Enable control input | Active-high logic: device enabled when voltage exceeds 1.4V; pulled low disables converter and discharges output via 100Ω PHASE path. |
| PG (Pin 4) | Power-good open-drain output | Asserts low during soft-start and when VOUT falls outside ±15% regulation window; includes 5MΩ internal pull-up. |
| FB (Pin 5) | Feedback node for voltage regulation | Connects to resistor divider midpoint; monitors output and feeds error amplifier; used by UV/OV protection circuits. |
| PGND (Pins 6,7) | Power and analog ground reference | Must be connected directly to PCB ground plane; shared return for input/output capacitors and inductor. |
| PHASE (Pin 8) | Switching node | Drives external inductor; discharged through 100Ω when disabled; requires low-inductance layout to minimize ringing. |
Key Features
| Feature | Design Value |
|---|---|
| PFM light-load operation | Reduces switching losses below ~300mA load, maintaining >85% efficiency at 1mA - ideal for intermittent-sensing IoT nodes. |
| Integrated PMOS high-side switch | Eliminates boot capacitor requirement, reducing BOM count and board area while simplifying layout. |
| 100% duty-cycle capability | Enables operation with VIN only slightly above VOUT (e.g., 3.4V→3.3V), preserving regulation during input sag. |
| Negative current protection | Shuts down both FETs if inductor current reaches –2A for two cycles, preventing reverse energy flow into source. |
| Comprehensive fault protection | Includes overcurrent (4.5A typ), short-circuit (VFB < 0.3V), thermal shutdown (150°C), and input UVLO (2.7V rising). |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Continuous glucose monitor with Bluetooth LE transmission, operating from coin-cell battery. IC Role / Device Role / Timing Role: Primary step-down regulator supplying 1.8V to MCU and 3.3V to RF transceiver via resistive divider. Use Value: 35µA quiescent current extends battery life beyond 1 year; PFM mode maintains >90% efficiency at µA-level sleep currents. |
Use Scenario: DIN-rail mounted temperature transmitter with 4–20mA loop power and isolated digital interface. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 24V loop-derived 5V to stable 3.3V for ADC and isolator ICs. Use Value: 100% duty cycle allows regulation even as input sags to 3.6V under heavy load; integrated OCP prevents latch-up during field wiring faults. |
| Telecom Line Cards | Gaming Peripheral Controllers |
|
Use Scenario: Small-form-factor SFP+ module requiring clean 1.2V core supply from 3.3V host rail. IC Role / Device Role / Timing Role: High-density POL converter delivering 3A with minimal footprint and low noise. Use Value: 1MHz fixed frequency enables predictable EMI filtering; 2mm×2mm DFN fits within tight card-edge spacing constraints. |
Use Scenario: Wireless gaming headset with active noise cancellation and touch controls, powered by rechargeable Li-Po. IC Role / Device Role / Timing Role: Main system regulator supplying 1.8V to DSP and 3.3V to Bluetooth SoC. Use Value: Integrated soft-start prevents inrush-induced brownout on shared battery rail; PG signal synchronizes firmware initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DLCR | 2.7V–6.5V input, 1.8A max, 0.7µA IQ, 1.8MHz/3.6MHz selectable frequency, WSON-10 package (2.5mm×2.5mm) | Better ultra-low-IQ performance but lower current rating; larger package increases solution size. | Select when battery runtime dominates over current capability and board space permits larger footprint. |
| MP2152GQBE-Z | 2.5V–5.5V input, 3A max, 25µA IQ, 2MHz fixed frequency, QFN-10 (2mm×2mm) with different pinout | Higher switching frequency enables smaller inductors but lacks 100% duty cycle; no negative current protection. | Select when 2MHz operation is preferred and dropout headroom >0.3V is guaranteed across operating conditions. |
Compared with TPS62840DLCR and MP2152GQBE-Z, the ISL80031FRZ-T uniquely combines 3A capability, 100% duty cycle, and PFM-mode 35µA IQ in a true 2mm×2mm footprint - making it optimal for high-current, battery-sensitive designs where input voltage may approach output voltage.
Availability
ISL80031FRZ-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, telecom line cards, and gaming peripheral controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL80031FRZ-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 continues to develop and support its high-performance analog and power management portfolio.
The ISL80031FRZ-T belongs to Renesas' ISL8003x family of monolithic synchronous buck regulators, designed specifically for space-constrained, battery-powered applications demanding high light-load efficiency and robust protection.
FAQ
What is the switching frequency of the ISL80031FRZ-T?
The ISL80031FRZ-T operates at a fixed 1MHz switching frequency. This value is factory-trimmed and not user-adjustable. It enables use of compact inductors (1.0–3.3µH) and provides a good balance between efficiency, transient response, and EMI filter size. The 1MHz frequency is confirmed in Table 1 of the FN8766 datasheet and applies specifically to the ISL80031 and ISL80031A variants.
Does the ISL80031FRZ-T require an external bootstrap capacitor?
No, the ISL80031FRZ-T does not require an external bootstrap capacitor. Its high-side switch is a PMOS transistor, eliminating the need for charge-pump or bootstrap circuitry. This reduces external component count, saves PCB area, and improves reliability - a key differentiator versus NMOS-based synchronous buck controllers.
What protection features are integrated into the ISL80031FRZ-T?
The ISL80031FRZ-T integrates overcurrent protection (trip at 3.6–5.4A), short-circuit protection (triggered when FB < 0.3V), thermal shutdown (150°C with 25°C hysteresis), input undervoltage lockout (2.7V rising threshold), output overvoltage protection (117% nominal), and negative current protection (–2A limit). All are implemented in hardware without software intervention.
Can the ISL80031FRZ-T operate with input voltage equal to output voltage?
Yes, the ISL80031FRZ-T supports 100% duty cycle operation, allowing it to maintain regulation even when VIN equals VOUT (e.g., 3.3V input → 3.3V output). This is critical for applications experiencing input rail sag, such as battery-powered systems nearing end-of-discharge, where dropout margin is minimal.
What is the feedback reference voltage for the ISL80031FRZ-T?
The ISL80031FRZ-T has a precision feedback reference voltage of 0.600V ±6mV over –40°C to +85°C, and 0.606V max over –40°C to +125°C. This reference sets the regulated output voltage via an external resistor divider connected to the FB pin, enabling accurate outputs from 0.8V upward (e.g., R1=200kΩ, R2=100kΩ yields 1.8V).
ISL80031FRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
ISL80031FRZ-T FAQ
1.How can I place an order for ISL80031FRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL80031FRZ-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 ISL80031FRZ-T reliable?
The price and inventory of ISL80031FRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL80031FRZ-T is usually 5 days.
3.What payment methods are accepted for ISL80031FRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL80031FRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL80031FRZ-T?
ISL80031FRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL80031FRZ-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 ISL80031FRZ-T?
For technical support, including ISL80031FRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL80031FRZ-T requirements.
6.How does Aetrix verify that ISL80031FRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL80031FRZ-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 ISL80031FRZ-T meets industry standards.
7.What is the process for return or replacement of ISL80031FRZ-T?
All ISL80031FRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL80031FRZ-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 ISL80031FRZ-T part is unused and in its original packaging.
Return procedure for ISL80031FRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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