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Renesas ISL854102FRZ-T
- Part No.:
- ISL854102FRZ-T
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL854102FRZ-T.pdf
- Description:
- IC REG BUCK ADJ 1.2A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,894
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Product details
Overview
ISL854102FRZ-T from Renesas Electronics is a wide-input synchronous buck regulator delivering up to 1.2A continuous output current with 3V–40V input range, integrated high-side/low-side NMOS FETs, and selectable PFM/PWM light-load operation-used in industrial control power rails requiring robust 40V transient tolerance and minimal external components.
For engineers reviewing the ISL854102FRZ-T datasheet, ISL854102FRZ-T pinout, ISL854102FRZ-T application, or ISL854102FRZ-T equivalent, key selection criteria include its 500kHz default switching frequency (adjustable 300kHz–2MHz), internal/external compensation flexibility, -40°C to +125°C operating range, and integrated power-good signaling for system sequencing.
Technical Context
The ISL854102FRZ-T implements peak current-mode PWM control with 450mV/T slope compensation and 500mV/A current sense gain, enabling fast transient response and pulse-by-pulse overcurrent protection. Its error amplifier offers dual transconductance modes: 50µA/V for internal compensation (COMP tied to VCC) or 230µA/V for external RC networks.
Light-load operation is managed via the SYNC pin: logic low enables automatic PFM mode, logic high forces PWM, and external clock injection synchronizes switching at 300kHz–2MHz. Overcurrent protection triggers at 1.6A typical peak limit with hiccup-mode recovery, while thermal shutdown activates at 150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports 24V industrial rails with 16V headroom for load-dump transients. |
| Output Current | 1.2A continuous - sufficient for powering microcontrollers, sensors, and FPGA I/O banks. |
| Switching Frequency | Default 500kHz; adjustable 300kHz–2MHz via FS pin resistor - balances efficiency vs. size of magnetics and EMI filtering. |
| FET On-Resistance | High-side: 350mΩ max; low-side: 130mΩ max - enables >90% efficiency at 12V→5V/1A with 22µH inductor. |
| Feedback Reference | 0.599V ±0.007V over -40°C to +125°C - ensures tight output regulation across temperature without trimming. |
| Soft-Start | Internal 2ms or capacitor-programmable - prevents inrush current into downstream capacitive loads. |
| Power-Good Threshold | ±6% window around regulated output - provides reliable system reset and sequencing signal. |
Pinout & Package
ISL854102FRZ-T is housed in a RoHS-compliant, thermally enhanced 12-lead 4mm × 3mm DFN package with exposed thermal pad (EPAD). The package supports high-power dissipation in compact industrial PCB layouts and requires ≥5 vias to GND plane under EPAD per datasheet layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS | Soft-start timing control | Capacitor-to-ground sets ramp time; tie to VCC for fixed 2ms internal soft-start. |
| 2 SYNC | Mode selection & synchronization input | Logic level selects PFM/PWM; accepts external clock up to 2MHz for multi-rail synchronization. |
| 3 BOOT | Bootstrap supply for high-side gate driver | Requires 100nF ceramic capacitor to PHASE; enables full enhancement of integrated high-side NMOS. |
| 4 VIN | Main power input | Supplies both power stage and internal 5V LDO; requires ≥4.7µF local ceramic decoupling. |
| 5 PHASE | Switch node | Connects to external inductor; carries high di/dt switching waveform - critical for layout integrity. |
| 6 PGND | Power ground return | Must connect directly to system GND plane; separate from signal ground to minimize noise coupling. |
| 7 EN | Enable control | Active-high; >1V enables regulator; tie to VIN for automatic startup; not compatible with VCC connection. |
| 8 PG | Open-drain power-good output | Pulled low during soft-start or out-of-regulation; includes 5MΩ internal pull-up for direct MCU interface. |
| 9 VCC | Internal 5V LDO output | Decouple with 1µF ceramic to PGND; powers internal bias circuitry and serves as reference for COMP/FS pins. |
| 10 FB | Feedback input | Inverting input of error amplifier; voltage divider sets output (VOUT = 0.599V × (1 + R2/R3)). |
| 11 COMP | Error amplifier output | Tie to VCC for internal compensation (150kΩ/54pF); connect RC network to GND for external loop tuning. |
| 12 FS | Frequency selection | Tie to VCC for 500kHz; connect resistor to GND for 300kHz–2MHz adjustment (e.g., 340kΩ → 300kHz). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck architecture | Integrated high-side (350mΩ max) and low-side (130mΩ max) NMOS FETs eliminate external diode, improving efficiency by ~5% vs. asynchronous designs. |
| Selectable light-load mode | PFM mode reduces quiescent current to 80µA at no load; forced PWM maintains fixed frequency for predictable EMI profile. |
| Flexible compensation | Internal compensation (COMP→VCC) eliminates external components; external RC allows optimization for varied output capacitance and load dynamics. |
| Robust protection suite | Includes overcurrent (1.6A peak limit), negative current limiting (-0.6A), overtemperature (150°C shutdown), and boot undervoltage lockout. |
| Industrial-grade thermal performance | θJA = 42°C/W and θJC = 4.5°C/W enable 1.2A operation at +125°C ambient with minimal heatsinking. |
Applications
| Industrial Control Power Supply | Medical Sensor Module |
|---|---|
Use Scenario: Powering PLC I/O modules and fieldbus transceivers in 24V rail environments with frequent load dumps. IC Role / Device Role / Timing Role: Primary DC-DC converter regulating 5V/3.3V from unregulated 24V input with 40V absolute max rating. Use Value: Integrated 40V-rated FETs and 150°C thermal shutdown prevent failure during 33V transients common in factory automation. |
Use Scenario: Providing clean, low-noise 3.3V for analog front-end sensors and low-power microcontrollers in portable diagnostic devices. IC Role / Device Role / Timing Role: Efficient point-of-load regulator with PFM mode extending battery life in handheld instruments. Use Value: 80µA quiescent current in PFM and ±6% power-good window ensure reliable wake-up and data acquisition integrity. |
| Distributed Telecom Power | Cloud Infrastructure PSU |
Use Scenario: Generating intermediate 5V rails from 12V or 48V intermediate bus in compact telecom edge nodes. IC Role / Device Role / Timing Role: Synchronous buck with 2MHz programmability enabling small 1µH inductors and reduced board area. Use Value: Adjustable frequency avoids noise coupling into sensitive RF sections while maintaining >90% efficiency at 1A. |
Use Scenario: Powering ASIC management controllers and fan drivers in server rack PSUs where thermal density is critical. IC Role / Device Role / Timing Role: High-current (1.2A), high-temp (125°C) regulator with EPAD thermal path for conduction-cooled modules. Use Value: 4.5°C/W junction-to-case resistance allows direct thermal pad mounting to cold plates, sustaining full load at elevated ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 3V–36V input, 1.2A, fixed 500kHz, no PFM mode, requires external compensation only | Lacks light-load efficiency optimization; better suited for constant-load applications with strict EMI requirements | Choose LM61480RQWR when fixed-frequency PWM-only operation simplifies EMI filtering and layout. |
| TPS54202HDDCR | 4.5V–28V input, 2A, 500kHz/1MHz, integrated compensation, no SYNC pin | Narrower input range excludes 40V industrial use; higher current but lower voltage rating | Choose TPS54202HDDCR for cost-sensitive 12V/24V systems needing 2A margin and simplified design. |
Compared with LM61480RQWR and TPS54202HDDCR, the ISL854102FRZ-T uniquely combines 40V input capability, PFM/PWM selectability, and internal/external compensation-making it optimal for thermally constrained, wide-input industrial and medical applications where light-load efficiency and transient robustness are critical.
Availability
ISL854102FRZ-T is available at Aetrix Electronics and suitable for industrial control, medical instrumentation, and cloud infrastructure applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for ISL854102FRZ-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 specializing in microcontrollers, analog, power management, and connectivity solutions for industrial, automotive, and infrastructure markets.
The ISL854102FRZ-T belongs to Renesas' ISL854xx family of wide-VIN synchronous buck regulators, designed specifically for high-reliability industrial power conversion where input transients, thermal stress, and minimal BOM count are primary design constraints.
FAQ
What is the maximum input voltage the ISL854102FRZ-T can withstand?
The ISL854102FRZ-T has an absolute maximum input voltage rating of +43V, with recommended operation from 3V to 40V. This 40V upper limit makes it suitable for 24V industrial systems subject to ISO 7637-2 load-dump transients, while the 43V absolute rating provides margin against short-duration spikes. Operation beyond 40V violates recommended conditions and may impact reliability.
Does the ISL854102FRZ-T require external compensation components?
No-the ISL854102FRZ-T supports both internal and external compensation. Tying the COMP pin to VCC engages internal 150kΩ/54pF compensation, eliminating external components. For custom loop response, connect an RC network from COMP to GND; transconductance shifts from 50µA/V (internal) to 230µA/V (external), enabling precise bandwidth and phase-margin tuning.
How does the ISL854102FRZ-T handle light-load efficiency?
The ISL854102FRZ-T improves light-load efficiency via PFM mode, enabled by pulling the SYNC pin low. In PFM, switching frequency drops dynamically with load, reducing gate charge losses and achieving 80µA quiescent current at no load. Forced PWM (SYNC high) maintains fixed frequency for EMI-sensitive applications, trading efficiency for spectral predictability.
What thermal performance can be expected from the ISL854102FRZ-T in a 125°C ambient environment?
With its 4.5°C/W junction-to-case thermal resistance and exposed thermal pad, the ISL854102FRZ-T sustains 1.2A continuous output at +125°C ambient when properly mounted to a thermal plane. The 150°C thermal shutdown threshold with 20°C hysteresis ensures safe derating, and θJA = 42°C/W allows operation without forced airflow in well-designed layouts.
Can the ISL854102FRZ-T be synchronized to an external clock?
Yes-the SYNC pin accepts external clock signals up to 2MHz with positive-edge triggering. The external clock must exceed the programmed switching frequency (e.g., >500kHz if FS = VCC). This enables multi-phase operation or EMI reduction by aligning switching edges across multiple ISL854102FRZ-T regulators on the same board.
ISL854102FRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-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):
- 3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 500kHz, 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
ISL854102FRZ-T FAQ
1.How can I place an order for ISL854102FRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL854102FRZ-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 ISL854102FRZ-T reliable?
The price and inventory of ISL854102FRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL854102FRZ-T is usually 5 days.
3.What payment methods are accepted for ISL854102FRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL854102FRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL854102FRZ-T?
ISL854102FRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL854102FRZ-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 ISL854102FRZ-T?
For technical support, including ISL854102FRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL854102FRZ-T requirements.
6.How does Aetrix verify that ISL854102FRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL854102FRZ-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 ISL854102FRZ-T meets industry standards.
7.What is the process for return or replacement of ISL854102FRZ-T?
All ISL854102FRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL854102FRZ-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 ISL854102FRZ-T part is unused and in its original packaging.
Return procedure for ISL854102FRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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