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Renesas ISL80031FRZ-T7A
- Part No.:
- ISL80031FRZ-T7A
- Manufacturer:
- Renesas
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
ISL80031FRZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 3A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,913
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Product details
Overview
ISL80031FRZ-T7A from Renesas (formerly Intersil) is a monolithic synchronous buck DC/DC converter optimized for high-efficiency, low-quiescent-current point-of-load regulation in space-constrained applications. It delivers up to 3A continuous output from 2.7V–5.5V input, operates at 1MHz switching frequency in PFM mode, achieves 95% peak efficiency, and integrates PMOS/NMOS power stages with 100% duty cycle capability - used in battery-powered industrial sensors and telecom POL rails.
For engineers reviewing the ISL80031FRZ-T7A datasheet, ISL80031FRZ-T7A pinout, ISL80031FRZ-T7A application, or ISL80031FRZ-T7A equivalent, key selection criteria include its 35µA quiescent current in PFM light-load operation, integrated negative current protection, 0.6V feedback reference with ±1% accuracy over –40°C to +125°C, and 2×2mm DFN package with exposed thermal pad.
Technical Context
The ISL80031FRZ-T7A implements pulse-frequency modulation (PFM) with zero-cross detection and 16-cycle skip-mode entry logic to minimize switching losses below ~300mA load. Its peak current-mode control uses slope compensation (900mV/Ts) and a transconductance error amplifier (40µA/V) with internal 27pF/200kΩ compensation.
It features dual MOSFET integration: 70mΩ PMOS high-side and 60mΩ NMOS low-side switches, eliminating boot capacitor requirements. Protection includes overcurrent (4.5A typ), short-circuit (VFB < 0.3V triggers 1/3-frequency reduction), thermal shutdown (150°C), and negative current limiting (–2A threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 5.5V - supports single-cell Li-ion, USB, and 3.3V/5V system rails without external LDO pre-regulation. |
| Max Output Current | 3A continuous - enables direct powering of FPGA I/O banks or microcontroller cores without external current boosting. |
| Switching Frequency | 1MHz (fixed) - balances EMI performance and inductor size; allows use of ≤3.3µH shielded inductors per Table 2. |
| Quiescent Current | 35µA (PFM mode) - extends battery life in always-on sensor nodes and IoT edge devices during sleep states. |
| Feedback Voltage | 0.600V ±1% (–40°C to +125°C) - enables precise output setting via standard resistor dividers; supports 0.8V–3.3V outputs. |
| Peak Efficiency | 95% at 1.8V/2A, VIN=5V - reduces thermal load in sealed enclosures and lowers system cooling requirements. |
| Duty Cycle Range | 0% to 100% - supports ultra-low dropout operation (e.g., 3.3V→3.0V) and seamless transition into dropout during brownout. |
Pinout & Package
ISL80031FRZ-T7A is housed in an 8-lead 2mm × 2mm DFN package with exposed thermal pad (EPAD), RoHS-compliant, moisture sensitivity level MSL3. The EPAD must be soldered to PGND for optimal thermal performance (θJC = 7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - VIN | Input power supply rail | Connects to 2.7–5.5V source; requires ≥10µF ceramic decoupling placed adjacent to pins 1/2. |
| 3 - EN | Enable control input | Active-high logic: device enabled when >1.4V; pulled low disables regulator and discharges output via 100Ω PHASE path. |
| 4 - PG | Power-good open-drain output | Asserts low during soft-start or if VOUT falls outside ±15% regulation window; internal 5MΩ pull-up. |
| 5 - FB | Feedback node for voltage regulation | Monitors output via resistor divider; sets VOUT = 0.6V × (1 + R1/R2); also used by UV/OV protection circuits. |
| 6, 7 - PGND | Power and analog ground reference | Must connect directly to PCB ground plane; shared return for VIN, PHASE, and EPAD; critical for noise immunity. |
| 8 - PHASE | Switching node between MOSFETs | Connects to inductor; carries high di/dt; requires short, low-inductance trace; discharged via 100Ω when disabled. |
| EPAD | Exposed thermal pad | Electrically tied to PGND; requires ≥4 thermal vias to inner ground plane for θJA = 70°C/W operation. |
Key Features
| Feature | Design Value |
|---|---|
| PFM light-load operation | Reduces switching losses below ~300mA, enabling 35µA IQ and extending battery runtime in intermittent-sensing applications. |
| Integrated PMOS high-side switch | Eliminates need for external bootstrap capacitor and diode, reducing BOM count and layout complexity in compact designs. |
| 100% duty cycle capability | Permits dropout-free operation down to VIN – VOUT ≈ 0V, supporting dynamic input voltage tracking in portable systems. |
| Negative current protection | Shuts down both FETs if inductor current reaches –2A for two consecutive cycles, preventing reverse conduction damage. |
| Internal soft-start and soft-stop | Controls output ramp rate (0.39–1.36ms) and discharge path (100Ω PHASE-to-GND), minimizing inrush and output overshoot. |
Applications
| Industrial Sensor Node | Telecom Point-of-Load |
|---|---|
|
Use Scenario: Battery-powered wireless temperature/humidity sensor operating in remote locations with 10-year target lifetime. IC Role / Device Role / Timing Role: Primary 3.3V POL regulator delivering 3A peak for RF transmission bursts while maintaining 35µA quiescent draw during sleep. Use Value: PFM mode extends battery life by >3× versus PWM alternatives; 100% duty cycle ensures stable 3.3V output even as Li-ion voltage drops to 3.4V. |
Use Scenario: Compact 1RU telecom line card requiring isolated 1.8V/3A rail for SERDES PHYs with strict EMI limits. IC Role / Device Role / Timing Role: High-density synchronous buck converter replacing discrete controller+MOSFET solutions on dense backplane cards. Use Value: 2×2mm DFN footprint saves >40% board area vs. comparable 3A regulators; 1MHz switching avoids critical 2.4GHz/5GHz Wi-Fi bands. |
| Medical Wearable Monitor | Game Console Peripheral |
|
Use Scenario: FDA-class wearable ECG patch powered by coin cell, requiring ultra-low-noise 2.5V analog supply. IC Role / Device Role / Timing Role: Low-noise, low-IQ step-down regulator feeding ADC reference and analog front-end circuitry. Use Value: Integrated soft-start prevents output overshoot into sensitive analog circuitry; 0.6V FB reference enables tight tolerance (<±1%) output regulation. |
Use Scenario: USB-powered VR motion controller needing fast transient response to handle burst GPU communication loads. IC Role / Device Role / Timing Role: High-efficiency 1.2V/3A POL regulator supplying SoC core voltage with minimal thermal dissipation. Use Value: Peak current-mode control delivers <10µs load-step response; 95% efficiency keeps surface temperature <40°C under full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS628641RQYR | 2.5V–5.5V input, 4A max, 2.25MHz fixed-frequency PWM only, 15µA IQ (non-PFM) | Lacks PFM mode; higher switching frequency increases EMI filtering burden but enables smaller inductors | Choose for higher current headroom and tighter output ripple; avoid where battery life depends on light-load IQ. |
| MP2152GQVE-15-Z | 2.5V–5.5V input, 3A max, 1.5MHz PWM/PFM auto-mode, 22µA IQ, 0.6V FB | Auto-mode transitions between PWM/PFM; slightly lower IQ than ISL80031FRZ-T7A but no 100% duty cycle support | Prefer for simpler design with automatic mode switching; select ISL80031FRZ-T7A when dropout-free operation is mandatory. |
Compared with TPS628641RQYR and MP2152GQVE-15-Z, the ISL80031FRZ-T7A uniquely combines 1MHz PFM operation, 35µA IQ, and guaranteed 100% duty cycle - making it optimal for long-life battery systems requiring both ultra-low standby power and robust dropout behavior.
Availability
ISL80031FRZ-T7A is available at Aetrix Electronics and suitable for industrial sensor nodes, telecom point-of-load rails, medical wearables, and game console peripherals requiring stable component supply across extended production lifecycles.
Supply support for ISL80031FRZ-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 acquired Intersil in 2017 and maintains full technical and manufacturing continuity for the ISL8003x family. Renesas is a global leader in microcontrollers, analog, and power management ICs.
The ISL8003x product line was designed specifically for high-efficiency, space-constrained DC/DC conversion in battery-powered and thermally limited applications - emphasizing low IQ, small footprint, and robust protection.
FAQ
What is the recommended input capacitance for ISL80031FRZ-T7A?
The ISL80031FRZ-T7A requires a minimum 10µF ceramic capacitor placed as close as possible to VIN pins 1 and 2. For optimal high-frequency noise suppression and transient response, a parallel combination of 10µF X5R/X7R + 1µF X7R is recommended. Layout must minimize loop inductance between VIN, PGND, and the capacitor.
Does ISL80031FRZ-T7A support adjustable output voltage?
Yes, ISL80031FRZ-T7A supports fully adjustable output voltage from 0.8V to 3.3V using an external resistor divider on the FB pin. The internal 0.600V reference enables precise setting via standard equations: VOUT = 0.6V × (1 + R1/R2). Table 2 in the datasheet provides validated R1/R2 values for common output voltages.
How does the PFM mode in ISL80031FRZ-T7A reduce power consumption at light loads?
The ISL80031FRZ-T7A enters PFM skip mode after detecting 16 consecutive zero-crossings of inductor current, reducing switching frequency dynamically. This cuts gate drive and switching losses, achieving just 35µA quiescent current - critical for extending battery life in always-on IoT endpoints where average load is <100mA.
What thermal considerations apply to ISL80031FRZ-T7A's 2×2mm DFN package?
The ISL80031FRZ-T7A's 2×2mm DFN uses an exposed thermal pad (EPAD) that must be soldered to a solid PGND plane. At least four 0.3mm vias under the EPAD are required to achieve θJA = 70°C/W. Without proper thermal vias, junction temperature can exceed 125°C at 3A load - derating above 2.5A is advised in still-air environments.
Can ISL80031FRZ-T7A operate with input voltage equal to output voltage?
Yes, ISL80031FRZ-T7A supports true 100% duty cycle operation, allowing VIN = VOUT (e.g., 3.3V input → 3.3V output) without dropout or regulation loss. This is enabled by its PMOS high-side architecture - unlike NMOS-based buck controllers that require minimum VIN–VOUT headroom for bootstrap charging.
ISL80031FRZ-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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
ISL80031FRZ-T7A FAQ
1.How can I place an order for ISL80031FRZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL80031FRZ-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 ISL80031FRZ-T7A reliable?
The price and inventory of ISL80031FRZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL80031FRZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL80031FRZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL80031FRZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL80031FRZ-T7A?
ISL80031FRZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL80031FRZ-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 ISL80031FRZ-T7A?
For technical support, including ISL80031FRZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL80031FRZ-T7A requirements.
6.How does Aetrix verify that ISL80031FRZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL80031FRZ-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 ISL80031FRZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL80031FRZ-T7A?
All ISL80031FRZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL80031FRZ-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 ISL80031FRZ-T7A part is unused and in its original packaging.
Return procedure for ISL80031FRZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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