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Renesas ISL80031AFRZ-T7A
- Part No.:
- ISL80031AFRZ-T7A
- Manufacturer:
- Renesas
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
ISL80031AFRZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 3A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,213
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Product details
Overview
ISL80031AFRZ-T7A 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 output current from a 2.7V–5.5V input, operates at 2MHz 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 point-of-load regulation.
For engineers reviewing the ISL80031AFRZ-T7A datasheet, ISL80031AFRZ-T7A pinout, ISL80031AFRZ-T7A application, or ISL80031AFRZ-T7A equivalent, key selection criteria include its PFM light-load efficiency, absence of boot capacitor requirement (due to integrated PMOS high-side switch), thermal shutdown at 150°C, and compatibility with standard 2mm×2mm DFN PCB footprints.
Technical Context
The ISL80031AFRZ-T7A implements peak current-mode control with slope compensation and zero-cross sensing to enable discontinuous conduction mode (PFM) operation. Its dedicated SKIP comparator activates after 16 consecutive zero-current crossings, reducing switching frequency under light loads to minimize gate and switching losses.
It features an internal 0.6V reference with ±1% accuracy over –40°C to +125°C, transconductance error amplifier (40µA/V), and integrated protection circuits including overcurrent (4.5A typical peak limit), negative current (–2A threshold), short-circuit (VFB < 0.3V), and thermal shutdown with 25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, USB, and 3.3V/5V rail inputs without external regulators. |
| Max Output Current | 3A continuous - sufficient for FPGA I/O banks, microcontroller cores, and sensor signal chains. |
| Switching Frequency | 2MHz nominal - enables use of sub-2.2µH inductors and reduces EMI filter size. |
| Quiescent Current | 35µA - extends battery life in always-on monitoring systems and IoT edge nodes. |
| Feedback Reference Voltage | 0.600V ±1% - allows precise output setting via external resistor divider (e.g., 1.8V @ R1=200kΩ/R2=100kΩ). |
| Thermal Shutdown Threshold | 150°C with 25°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Efficiency Peak | Up to 95% - achieved at mid-load with 3.3VIN/1.8VOUT, critical for thermally limited enclosures. |
Pinout & Package
ISL80031AFRZ-T7A uses an 8-lead 2mm×2mm DFN package with exposed thermal pad (EPAD), RoHS-compliant, moisture sensitivity level MSL3, and optimized for low-inductance layout with dual PGND pins and VIN decoupling on adjacent leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2) | Power input supply | Supplies both power stage and internal LDO; requires ≥10µF ceramic decoupling placed adjacent to pins. |
| EN (Pin 3) | Enable control input | Active-high logic: device enabled when >1.4V; pulls output to ground via 100Ω when disabled. |
| PG (Pin 4) | Power-good open-drain output | Asserts low during soft-start and when VOUT deviates >±15% from regulation; includes 5MΩ internal pull-up. |
| FB (Pin 5) | Feedback voltage sense | Connects to resistor divider midpoint; monitors output for regulation, UV/OV protection, and PG assertion. |
| PGND (Pins 6,7) | Power and analog ground | Must be connected directly to PCB ground plane; multiple vias recommended under EPAD for thermal performance. |
| PHASE (Pin 8) | Switching node | Drives external inductor; discharged via 100Ω resistor during shutdown to prevent output ringing. |
| EPAD | Exposed thermal pad | Electrically tied to PGND; mandatory connection for thermal integrity and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| PFM Discontinuous Conduction Mode | Reduces switching loss at light loads by dynamically lowering frequency - maintains >85% efficiency down to 10mA load. |
| Integrated PMOS High-Side Switch | Eliminates need for external bootstrap capacitor and diode - simplifies layout and reduces BOM count by two components. |
| 100% Duty Cycle Operation | Enables dropout operation (e.g., 3.3VIN → 3.3VOUT) - critical for maintaining rail integrity during brown-out conditions. |
| Internal Soft-Start and Soft-Stop | 1ms typical ramp time prevents inrush current and output overshoot during startup/shutdown - protects downstream capacitors. |
| Negative Current Protection | Shuts down both FETs if inductor valley current reaches –2A for two cycles - prevents reverse energy flow into source. |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
|
Use Scenario: Powering ultra-low-power ADCs, temperature sensors, and BLE radio in battery-operated field instruments. IC Role / Device Role / Timing Role: Primary POL regulator delivering stable 1.8V/3A with minimal quiescent draw. Use Value: 35µA IQ extends 2xAA alkaline battery life beyond 5 years in sleep mode while supporting fast wake-up response. |
Use Scenario: Supplying patient interface circuitry (touch controller, display backlight driver) in handheld ECG units. IC Role / Device Role / Timing Role: Efficient step-down converter from 3.7V Li-ion to 2.5V/3A for mixed-signal subsystems. Use Value: 2MHz operation allows compact 1.5µH inductor and 22µF output capacitance - meeting strict size constraints. |
| Telecom Line Card | Gaming Peripheral Controller |
|
Use Scenario: Providing clean 1.2V core voltage to FPGA-based packet processing engines in access switches. IC Role / Device Role / Timing Role: High-transient-response buck converter with 100% duty cycle support for input rail droop. Use Value: Peak current-mode control and 4.5A OCP limit ensure stable operation during burst traffic-induced load steps. |
Use Scenario: Regulating 3.3V for USB-C PD negotiation IC and RGB LED drivers in programmable gaming mice. IC Role / Device Role / Timing Role: Compact, low-noise POL solution with integrated PG indicator for firmware-controlled power sequencing. Use Value: Power-good flag synchronizes LED initialization with stable 3.3V rail - eliminating visual flicker on device plug-in. |
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, 1.8µA IQ, fixed 1.8V output; no adjustable FB, smaller 1.5mm×1.5mm package. | Better for ultra-low-IQ designs with fixed output; unsuitable for >1.8A or adjustable VOUT needs. | Select when board space is <2.25mm² and output voltage is fixed; avoid when >1.8A or programmable VOUT required. |
| MP2152GQZ-P | 2.5V–5.5V input, 3A max, 300kHz–2.2MHz adjustable fSW, 25µA IQ, requires external bootstrap capacitor. | Offers frequency programming and lower IQ than ISL80031A but adds complexity with boot circuit and external compensation. | Choose when design requires tunable switching frequency or tighter EMI control; accept added component count for flexibility. |
Compared with TPS62840DLCR and MP2152GQZ-P, the ISL80031AFRZ-T7A provides higher output current (3A vs 1.8A), fully integrated PFM/PWM architecture without boot components, and superior thermal performance in the 2mm×2mm footprint - making it optimal for industrial and medical applications demanding reliability and simplicity.
Availability
ISL80031AFRZ-T7A is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, telecom line cards, and gaming peripheral controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL80031AFRZ-T7A 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 Corporation acquired Intersil in 2017 and continues to develop high-performance analog and power management ICs for industrial, automotive, and communications markets.
The ISL80031AFRZ-T7A belongs to Renesas' ISL8003x family of monolithic buck converters designed specifically for space-constrained, battery-sensitive applications requiring high light-load efficiency and robust protection.
FAQ
What is the switching frequency of the ISL80031AFRZ-T7A and how is it set?
The ISL80031AFRZ-T7A operates at a nominal 2MHz switching frequency, determined by internal oscillator design and fixed per part number - no external components or configuration pins are required to set or adjust fSW. This frequency is confirmed in Table 1 of the FN8766 datasheet and enables compact magnetics and reduced output ripple without compromising transient response.
Does the ISL80031AFRZ-T7A require a bootstrap capacitor?
No, the ISL80031AFRZ-T7A does not require a bootstrap capacitor because it integrates a PMOS high-side switch - eliminating the need for charge-pump circuitry. This simplifies layout, reduces component count, and improves reliability compared to NMOS-based buck controllers that mandate external bootstrap networks.
What protection features are built into the ISL80031AFRZ-T7A?
The ISL80031AFRZ-T7A includes overcurrent protection (trip at ~4.5A), short-circuit protection (VFB < 0.3V triggers 1/3-frequency mode), negative current protection (shuts down at –2A valley current), thermal shutdown (150°C with 25°C hysteresis), and input undervoltage lockout (2.7V rising threshold). All protections are fully integrated and require no external components.
Can the ISL80031AFRZ-T7A operate at 100% duty cycle, and what is its practical benefit?
Yes, the ISL80031AFRZ-T7A supports true 100% duty cycle operation, allowing VOUT to equal VIN (e.g., 3.3VIN → 3.3VOUT). This is essential during input voltage droop events - such as battery discharge or line transients - ensuring uninterrupted power to downstream circuitry without dropout or reset.
How does the PFM mode in the ISL80031AFRZ-T7A improve efficiency at light loads?
The ISL80031AFRZ-T7A enters PFM mode after detecting 16 consecutive zero-current crossings in the inductor, then skips pulses to reduce switching frequency and associated gate/switching losses. This maintains >85% efficiency at 10mA load - significantly outperforming PWM-only converters like the ISL80030A under standby conditions.
ISL80031AFRZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VFDFN 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):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
ISL80031AFRZ-T7A FAQ
1.How can I place an order for ISL80031AFRZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL80031AFRZ-T7A 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 ISL80031AFRZ-T7A reliable?
The price and inventory of ISL80031AFRZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL80031AFRZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL80031AFRZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL80031AFRZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL80031AFRZ-T7A?
ISL80031AFRZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL80031AFRZ-T7A 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 ISL80031AFRZ-T7A?
For technical support, including ISL80031AFRZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL80031AFRZ-T7A requirements.
6.How does Aetrix verify that ISL80031AFRZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL80031AFRZ-T7A 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 ISL80031AFRZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL80031AFRZ-T7A?
All ISL80031AFRZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL80031AFRZ-T7A, 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 ISL80031AFRZ-T7A part is unused and in its original packaging.
Return procedure for ISL80031AFRZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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