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Renesas ISL854102FRZ
- Part No.:
- ISL854102FRZ
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL854102FRZ.pdf
- Description:
- IC REG BUCK ADJ 1.2A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,526
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Product details
Overview
ISL854102FRZ from Renesas Electronics is a wide-input synchronous buck regulator delivering up to 1.2A continuous output current, operating from 3V to 40V input, integrating high-side and low-side NMOS FETs, with selectable PFM/PWM light-load operation and 500kHz default switching frequency. It serves as a primary DC-DC step-down power stage in industrial control systems requiring robust 40V-rated conversion.
For engineers reviewing the ISL854102FRZ datasheet, ISL854102FRZ pinout, ISL854102FRZ application, or ISL854102FRZ equivalent, key selection criteria include its integrated dual-FET architecture, internal/external compensation flexibility, programmable 300kHz–2MHz switching frequency, -40°C to +125°C industrial temperature range, and DFN-12 (4mm×3mm) package with exposed thermal pad.
Technical Context
The ISL854102FRZ 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 supports both internal (150kΩ/54pF) and external RC compensation networks, with transconductance of 50µA/V (internal) or 230µA/V (external).
Light-load behavior is configurable via the SYNC pin: logic low enables automatic PFM/PWM transition, logic high forces PWM, and external clock input synchronizes switching at 300kHz–2MHz. Overcurrent protection uses a 1.6A typical positive peak limit and -0.6A negative current limit, with hiccup-mode recovery after fault detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports direct battery input (12V/24V/36V rails) and unregulated industrial supplies without pre-regulation. |
| Output Current | 1.2A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in compact embedded systems. |
| Switching Frequency | 500kHz default, adjustable 300kHz–2MHz via FS pin resistor - enables optimization of efficiency vs. size trade-offs using standard 22µH inductors. |
| Integrated FETs | High-side RDS(on) = 350mΩ, low-side RDS(on) = 130mΩ - eliminates external MOSFETs and gate drivers, reducing BOM count and layout complexity. |
| Feedback Reference | 0.599V ±0.007V over -40°C to +125°C - enables precise output regulation (e.g., 3.3V ±1.5%) with standard resistor dividers. |
| Protection Features | Thermal shutdown (150°C), overcurrent (1.6A peak), negative current limit (-0.6A), boot undervoltage - ensures reliable operation under fault conditions without external circuitry. |
| Soft-Start | Programmable via SS pin capacitor or fixed 2ms internal ramp - prevents inrush current into downstream capacitors during power-up. |
Pinout & Package
ISL854102FRZ is housed in a RoHS-compliant, thermally enhanced 12-lead DFN package (4mm × 3mm, L12.4x3), featuring an exposed EPAD connected to GND for efficient heat dissipation in high-power-density designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SS | Soft-start timing control | Capacitor-to-ground sets ramp time; tied to VCC enables fixed 2ms internal soft-start. |
| SYNC | Mode selection & synchronization input | Logic level selects PFM/PWM; external clock input synchronizes switching above programmed frequency. |
| BOOT | Bootstrap supply for high-side FET gate | Requires 100nF ceramic capacitor to PHASE to sustain gate drive during high-side conduction. |
| VIN | Main power input | Supplies power stage and internal LDO; requires ≥4.7µF ceramic decoupling close to pin. |
| PHASE | Switch node | Connects integrated FETs to external inductor; carries high di/dt switching current. |
| PGND | Power ground return | Low-impedance path for inductor current; must connect directly to system GND plane. |
| EN | Enable control | Active-high input; >1V enables regulator; tie to VIN for automatic startup. |
| PG | Open-drain power-good indicator | Pulled low during soft-start or if FB voltage deviates >6% from target; includes 5MΩ internal pull-up. |
| VCC | Internal 5V bias regulator output | Supplies internal circuitry; requires 1µF ceramic decoupling to PGND. |
| FB | Feedback input | Inverting input of error amplifier; monitors output via resistor divider to set regulated voltage. |
| COMP | Error amplifier output | Tie to VCC for internal compensation; connect RC network to GND for external loop tuning. |
| FS | Frequency selection | Tie to VCC for 500kHz; resistor-to-GND sets frequency from 300kHz to 2MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Wide 3V–40V input range | Enables single-supply operation across automotive, industrial, and battery-powered systems without input pre-regulation. |
| Integrated high- and low-side NMOS FETs | Reduces external component count by eliminating discrete MOSFETs and gate drivers, simplifying layout and improving reliability. |
| Selectable PFM or forced PWM mode | Improves light-load efficiency (PFM) while maintaining fixed-frequency EMI profile (PWM) - selected dynamically or via SYNC pin. |
| Internal or external loop compensation | Supports rapid prototyping with internal 150kΩ/54pF network or precision tuning with external RC for custom transient response. |
| Power-good and enable functions | Provides system-level sequencing control and fault indication without external supervisors or logic. |
| Robust protection suite | Includes overcurrent, overtemperature, negative current limit, and boot undervoltage protection - reduces need for external fault management circuitry. |
Applications
| Industrial Control Systems | Medical Instrumentation |
|---|---|
Use Scenario: Powering PLC I/O modules, motor drivers, and sensor signal conditioning circuits in factory automation cabinets with 24V DC bus. IC Role / Device Role / Timing Role: Primary 5V or 3.3V point-of-load regulator converting unregulated 24V rail to MCU and peripheral supply. Use Value: Withstands 40V transients per IEC 61000-4-4, operates continuously at +125°C ambient, and delivers stable 1.2A with <±1.5% load regulation. | Use Scenario: Supplying isolated analog front-ends, ADCs, and low-noise amplifiers in portable ultrasound and patient monitoring devices. IC Role / Device Role / Timing Role: Secondary regulated supply derived from lithium-ion battery (3.0–4.2V) or 12V wall adapter. Use Value: PFM mode extends battery life by maintaining >85% efficiency at 10mA load; low quiescent current (80µA) minimizes standby drain. |
| Cloud Infrastructure Power | Distributed Power Supplies |
Use Scenario: Providing auxiliary 3.3V/5V rails for FPGA configuration, fan controllers, and BMCs in 1U server chassis with 48V intermediate bus. IC Role / Device Role / Timing Role: Non-isolated buck converter stepping down 48V to 5V, synchronized to system clock via SYNC pin. Use Value: 2MHz programmability allows use of smaller 4.7µH inductors; thermal resistance θJA = 42°C/W supports high-density board layouts. | Use Scenario: Generating multiple local supplies in telecom base stations where centralized 48V distribution feeds remote radio units. IC Role / Device Role / Timing Role: Compact, self-contained DC-DC module replacing discrete controller+FET solutions. Use Value: DFN-12 package (4mm×3mm) occupies <12mm² PCB area; integrated FETs eliminate gate-drive loop parasitics for cleaner switching waveforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | 3.3V–36V input, 0.6A output, fixed 2MHz frequency, no PFM mode, 8-pin SOIC package | Limited to lower current and narrower input range; lacks light-load efficiency optimization | Choose when fixed high-frequency operation and SOIC assembly compatibility outweigh current and efficiency requirements. |
| TPS54202DRCT | 4.5V–28V input, 2A output, integrated FETs, 500kHz–2.2MHz adjustable frequency, PFM/PWM selectable | Higher current capability but narrower input range; requires external compensation for stability | Prefer when >1.2A load margin is needed and 28V max input suffices; verify thermal performance at full load in DFN-10 package. |
Compared with MP2451DT-LF-Z and TPS54202DRCT, the ISL854102FRZ uniquely combines 40V input tolerance, 1.2A output, and seamless PFM/PWM transition in a thermally optimized 4mm×3mm DFN-making it optimal for space-constrained, high-voltage industrial and medical applications where reliability across extended temperature ranges is critical.
Availability
ISL854102FRZ is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, and cloud infrastructure power applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ISL854102FRZ 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 SoC solutions for automotive, industrial, and enterprise markets.
The ISL854102FRZ belongs to Renesas' ISL854xx family of wide-input synchronous buck regulators, engineered specifically for high-reliability industrial and medical power conversion where input voltage transients, extended temperature operation, and minimal external components are design priorities.
FAQ
What is the maximum input voltage rating for the ISL854102FRZ?
The ISL854102FRZ has an absolute maximum input voltage rating of +43V, with recommended continuous operation from 3V to 40V. This 40V upper limit enables direct connection to 36V battery systems and industrial 24V/48V intermediate buses with margin for transients. Operation beyond 40V risks permanent damage, even briefly, and violates the device's specified operating conditions.
Does the ISL854102FRZ require external compensation components?
The ISL854102FRZ supports both internal and external compensation. When the COMP pin is tied to VCC, internal 150kΩ/54pF compensation is enabled - requiring no external parts. For custom loop response, an RC network from COMP to GND activates external compensation with 230µA/V transconductance. The choice depends on stability requirements and transient performance targets.
How does the ISL854102FRZ handle light-load efficiency optimization?
The ISL854102FRZ improves light-load efficiency via selectable PFM mode, activated by pulling the SYNC pin low. In PFM, the regulator skips pulses to maintain regulation, reducing switching losses. At loads below ~100mA, this increases efficiency by 5–10% versus forced PWM. The transition is automatic unless SYNC is held high for fixed-frequency operation.
What thermal performance can be expected from the ISL854102FRZ in a standard PCB layout?
In a standard 4-layer PCB with 2oz copper and thermal vias under the EPAD, the ISL854102FRZ achieves θJA = 42°C/W. At 1.2A output with 12V input and 5V output, typical power dissipation is ~0.6W, resulting in ~25°C junction-to-ambient rise. Full 1.2A operation at +125°C ambient requires careful thermal design, as maximum junction temperature is +150°C.
Can the ISL854102FRZ be synchronized to an external clock source?
Yes, the ISL854102FRZ supports external synchronization via the SYNC pin. An external clock signal (300kHz–2MHz) applied to SYNC overrides the internal oscillator and aligns switching edges to the external edge-triggered source. The external clock frequency must exceed the programmed internal frequency (set by FS pin) to avoid instability or missed cycles.
ISL854102FRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ISL854102FRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL854102FRZ 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 reliable?
The price and inventory of ISL854102FRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL854102FRZ is usually 5 days.
3.What payment methods are accepted for ISL854102FRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL854102FRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL854102FRZ?
ISL854102FRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL854102FRZ 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?
For technical support, including ISL854102FRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL854102FRZ requirements.
6.How does Aetrix verify that ISL854102FRZ is sourced from the original manufacturer or authorized distributors?
All ISL854102FRZ 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 meets industry standards.
7.What is the process for return or replacement of ISL854102FRZ?
All ISL854102FRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL854102FRZ, 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 part is unused and in its original packaging.
Return procedure for ISL854102FRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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