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Renesas ISL854102FRZ-T7A
- Part No.:
- ISL854102FRZ-T7A
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL854102FRZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 1.2A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,475
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Product details
Overview
ISL854102FRZ-T7A from Renesas is a wide-input (3V–40V), 1.2A synchronous buck regulator in a 12-lead 4mm×3mm DFN package, integrating high-side and low-side NMOS FETs, supporting PFM/PWM light-load operation, 500kHz default switching frequency (adjustable 300kHz–2MHz), and internal/external compensation - deployed in industrial control power rails and medical device DC-DC conversion.
For engineers reviewing the ISL854102FRZ-T7A datasheet, ISL854102FRZ-T7A pinout, ISL854102FRZ-T7A application, or ISL854102FRZ-T7A equivalent, key selection criteria include input voltage range (3–40V), continuous output current (1.2A), thermal performance (θJC = 4.5°C/W), soft-start configurability (internal 2ms or external capacitor), and robust protection features including overcurrent, overtemperature, and negative current limiting.
Technical Context
The ISL854102FRZ-T7A implements peak current-mode PWM control with 450mV/T slope compensation and 500mV/A current sense gain, enabling fast transient response and stable loop behavior across input and load variations. Its error amplifier offers dual transconductance modes: 50µA/V for internal compensation (COMP tied to VCC) and 230µA/V for external RC networks.
Light-load operation supports three modes: automatic PFM/PWM selection (SYNC floating), forced PWM (SYNC = VCC), or forced PFM (SYNC = GND). Synchronization capability accepts external clocks up to 2MHz with positive-edge triggering, and the IC includes integrated boot undervoltage protection, zero-current detection, and hiccup-mode overcurrent recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports direct connection to 12V/24V industrial buses and 36V battery systems without pre-regulation. |
| Output Current | 1.2A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in compact embedded systems. |
| Switching Frequency | Default 500kHz; adjustable 300kHz–2MHz via FS pin resistor - enables EMI optimization and inductor size trade-offs. |
| FB Reference Voltage | 0.599V ±1.7mV (–40°C to +125°C) - sets output accuracy for 3.3V, 5V, and other regulated rails using standard resistor dividers. |
| Peak Current Limit | 1.6A typical - provides margin above 1.2A rated output while enabling reliable short-circuit protection. |
| Thermal Resistance θJC | 4.5°C/W - enables high-power density layout with minimal copper area required under EPAD for junction-to-case heat transfer. |
| Soft-Start Time | Internal 2ms (SS = VCC) or programmable via SS-to-GND capacitor - prevents inrush current into downstream capacitors during power-up. |
Pinout & Package
Package: 12-lead 4mm × 3mm DFN with exposed thermal pad (RoHS-compliant, MSL3, –40°C to +125°C operating range).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SS | Soft-start timing control | Connect to VCC for fixed 2ms ramp; connect capacitor to GND for user-defined ramp time (5.5µA charging current). |
| SYNC | Mode selection & sync input | Logic high = forced PWM; logic low = forced PFM; floating = auto-select; external clock input (positive edge, > fSW). |
| BOOT | Bootstrap supply for high-side gate driver | Requires 100nF ceramic capacitor between BOOT and PHASE to sustain high-side NMOS turn-on. |
| VIN | Main power input | Supplies power stage and internal LDO; requires ≥4.7µF ceramic decoupling close to pin. |
| PHASE | Switch node | Connects internal FETs to external inductor; high dv/dt node requiring tight layout and ground plane separation. |
| PGND | Power ground return | Must connect directly to system GND plane - separate from signal GND to minimize noise coupling. |
| EN | Enable control | Active-high; >1V enables regulator; tied to VIN for automatic startup; not compatible with VCC connection. |
| PG | Open-drain power-good indicator | Pulled low during soft-start, UVLO, or fault; internal 5MΩ pull-up; monitors FB voltage window (±6% to ±20%). |
| VCC | Internal 5V bias regulator output | Decouple with 1µF ceramic to PGND; powers internal circuitry; POR threshold 2.75V (rising). |
| FB | Feedback input | Inverting input of error amplifier; connected to resistor divider from VOUT; leakage <150nA ensures precision regulation. |
| COMP | Error amplifier output | Tie to VCC for internal compensation (150kΩ/54pF); connect RC network to GND for external loop tuning. |
| 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 NMOS integration | Eliminates external diode, reduces conduction loss, and improves full-load efficiency by ~5–8% vs. asynchronous designs. |
| Selectable PFM/PWM operation | Enables >85% efficiency at 10mA load (PFM) while maintaining tight regulation and low noise in PWM mode at higher currents. |
| Internal/external compensation | Reduces BOM count when using internal compensation; external RC allows fine-tuning for custom inductor/capacitor combinations. |
| Robust protection suite | Includes hiccup-mode overcurrent, –0.6A negative current limit, 150°C thermal shutdown with 20°C hysteresis, and boot UVLO. |
| Power-good with window monitoring | PG asserts low if FB falls below 94% or rises above 120% of reference - enables safe sequencing in multi-rail systems. |
Applications
| Industrial Control | Medical Devices |
|---|---|
Use Scenario: Powering PLC I/O modules and fieldbus interface circuits in harsh factory environments with 24V DC bus. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator delivering clean, regulated voltage with high PSRR and low ripple. Use Value: Wide 3–40V input accommodates bus voltage sag and surge; 125°C rating ensures reliability in uncooled enclosures. | Use Scenario: Supplying isolated sensor front-ends and low-power MCU subsystems in portable diagnostic equipment. IC Role / Device Role / Timing Role: Efficient step-down converter from single-cell Li-ion (up to 4.2V) or 3.7V nominal, or from 12V auxiliary rail. Use Value: PFM mode extends battery runtime at standby; internal soft-start prevents sensor reset during power-up. |
| Portable Instrumentation | Distributed Power Supplies |
Use Scenario: Regulating power for handheld test meters with mixed analog/digital circuitry and LCD displays. IC Role / Device Role / Timing Role: Main 3.3V rail generator with low-noise PWM operation and precise 0.599V reference for ADC reference stability. Use Value: 1.2A output supports burst-mode digital processing; SYNC pin enables synchronization to system clock to reduce beat frequencies. | Use Scenario: Providing local 5V/12V rails in telecom line cards or server management modules with distributed 48V input. IC Role / Device Role / Timing Role: Compact, high-efficiency secondary-side buck converter replacing discrete controller+FET solutions. Use Value: Minimal external components (only inductor, caps, resistors) reduce board area and assembly cost; DFN package aids thermal management in dense layouts. |
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 | 4.5–36V input, 8A output, 2.1MHz max frequency, integrated compensation only; no PFM mode. | Better suited for high-current, space-constrained applications where 1.2A is insufficient; lacks light-load efficiency optimization. | Choose LM61480RQWR only when >2A output or >2MHz switching is required; not drop-in due to different pinout and control scheme. |
| TPS54202DRCT | 4.5–28V input, 2A output, 500kHz fixed frequency, no PFM, external compensation only; smaller 3mm×2mm WSON package. | Higher current but narrower input range; less suitable for 36–40V industrial inputs or battery-fed 3V start-up. | Prefer TPS54202DRCT for cost-sensitive 2A designs with 24V-only input; verify thermal performance at full load in same footprint. |
Compared with LM61480RQWR and TPS54202DRCT, the ISL854102FRZ-T7A uniquely balances ultra-wide 3–40V input, 1.2A capability, PFM efficiency at microamp loads, and flexible compensation - making it optimal for industrial and medical applications demanding both ruggedness and light-load battery life.
Availability
ISL854102FRZ-T7A is available at Aetrix Electronics and suitable for industrial control, medical devices, and portable instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL854102FRZ-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 is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT markets.
The ISL854102FRZ-T7A belongs to Renesas' ISL854xx family of wide-input synchronous buck regulators, designed specifically for high-reliability industrial and medical power conversion where input voltage variation, thermal stress, and long-term availability are critical.
FAQ
What is the maximum input voltage rating for the ISL854102FRZ-T7A?
The ISL854102FRZ-T7A has an absolute maximum input voltage rating of +43V, with recommended operating range from +3V to +40V. This allows direct use with 36V battery systems and 24V industrial buses, including transient surges up to 40V without external clamping. Operation beyond 40V violates recommended conditions and risks permanent damage.
Does the ISL854102FRZ-T7A support external frequency synchronization?
Yes, the ISL854102FRZ-T7A supports external synchronization via the SYNC pin, accepting positive-edge-triggered clock signals from 300kHz to 2MHz. The external clock must exceed the programmed internal switching frequency; for example, if FS is set for 500kHz, SYNC input must be >500kHz. This feature enables EMI reduction through clock alignment in multi-regulator systems.
How is soft-start configured on the ISL854102FRZ-T7A?
The ISL854102FRZ-T7A offers two soft-start options: tie SS to VCC for a fixed 2ms internal ramp, or connect a capacitor from SS to GND for programmable timing (tSS ≈ C × 0.109 ms, where C is in nF). The 5.5µA internal current source charges the capacitor, and FB follows this ramp until reaching the 600mV reference - ensuring controlled VOUT rise without inrush current.
What protection features does the ISL854102FRZ-T7A include?
The ISL854102FRZ-T7A integrates overcurrent protection (hiccup mode, 1.6A typical limit), overtemperature shutdown (150°C trip, 20°C hysteresis), negative current limiting (–0.6A), boot undervoltage lockout, and power-good monitoring. These features ensure safe operation during faults, prevent latch-up, and enable automatic recovery after transient events - critical for unattended industrial and medical deployments.
Can the ISL854102FRZ-T7A operate with only internal compensation?
Yes, the ISL854102FRZ-T7A supports fully internal compensation by tying the COMP pin to VCC, which activates a built-in 150kΩ/54pF network and sets error amplifier transconductance to 50µA/V. This configuration eliminates external components for standard 22µH inductors and 10–47µF output capacitors, reducing BOM count and design complexity while maintaining stability across temperature and load.
ISL854102FRZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-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):
- 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-T7A FAQ
1.How can I place an order for ISL854102FRZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL854102FRZ-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 ISL854102FRZ-T7A reliable?
The price and inventory of ISL854102FRZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL854102FRZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL854102FRZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL854102FRZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL854102FRZ-T7A?
ISL854102FRZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL854102FRZ-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 ISL854102FRZ-T7A?
For technical support, including ISL854102FRZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL854102FRZ-T7A requirements.
6.How does Aetrix verify that ISL854102FRZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL854102FRZ-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 ISL854102FRZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL854102FRZ-T7A?
All ISL854102FRZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL854102FRZ-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 ISL854102FRZ-T7A part is unused and in its original packaging.
Return procedure for ISL854102FRZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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