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Renesas ISL78228ARZ
- Part No.:
- ISL78228ARZ
- Manufacturer:
- Renesas
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
ISL78228ARZ.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,994
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Product details
Overview
ISL78228ARZ from Renesas Electronics is a dual-channel synchronous buck regulator delivering up to 800mA per channel from a 2.75V–5.5V input, operating at 2.25MHz fixed switching frequency with selectable forced PWM or PFM mode, and featuring 0.6V feedback reference, 1ms power-good output, and AEC-Q100 qualification for automotive infotainment and camera systems.
For engineers reviewing the ISL78228ARZ datasheet, ISL78228ARZ pinout, ISL78228ARZ application, or ISL78228ARZ equivalent, key selection considerations include its dual 800mA output capability, 30µA quiescent current in PFM mode, 100% duty cycle support, thermal shutdown at 150°C, and 3mm×3mm 10-lead DFN package optimized for space-constrained automotive DC/DC POL designs.
Technical Context
The ISL78228ARZ employs current-mode control with internal slope compensation and transconductance error amplifiers, enabling fast transient response and stable loop behavior across load and line variations. Its dual-channel architecture operates in-phase with independent enable (EN1/EN2) and feedback (FB1/FB2) inputs, supporting start-up with prebiased outputs and soft-stop discharge via internal 100Ω switch.
Switching is governed by a 2.25MHz oscillator (adjustable up to 4MHz via SYNC pin), with overcurrent protection triggered at 590mV CSA output (≈1.2A peak), and UVLO thresholds of 2.75V (rising) and 2.4V (falling). Power-good monitoring uses internal 88–96% rising/falling thresholds with 1ms delay on open-drain PG pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current (per channel) | 800mA continuous - supports dual-core µC, FPGA I/O, or DSP core rails without external current boosting. |
| Switching Frequency | 2.25MHz (typical), synchronizable up to 4MHz - enables use of compact 2.2µH inductors and low-ESR ceramic capacitors, minimizing PCB area to <1.8cm². |
| Quiescent Current (PFM) | 30µA total (both channels) - extends battery life in always-on automotive modules like rear camera wake-up circuits. |
| Feedback Reference Voltage | 0.60V ±10mV - allows precise output programming down to 0.6V using standard resistor dividers; supports 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V rails. |
| Power-Good Delay | 1ms fixed delay - provides deterministic system reset timing after both outputs reach regulation, critical for sequenced µP boot in navigation units. |
| Operating Temperature Range | −40°C to +105°C - meets AEC-Q100 Grade 2 requirements for under-hood and cabin-mounted automotive electronics. |
| Thermal Shutdown Threshold | 150°C with 25°C hysteresis - ensures safe recovery after overload or poor heatsinking in sealed infotainment enclosures. |
Pinout & Package
ISL78228ARZ is housed in a 3mm × 3mm, 10-lead DFN package (L10.3x3C) with exposed thermal pad requiring connection to PGND via multiple vias for optimal thermal performance (θJA = 49°C/W, θJC = 4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 / FB2 | Channel 1 / Channel 2 feedback input | Negative input to transconductance error amplifier; sets output voltage via external resistor divider referenced to 0.6V internal bandgap. |
| EN1 / EN2 | Channel 1 / Channel 2 enable input | Active-high logic control; pulls output low and discharges capacitor when driven low - enables precise power sequencing in multi-rail systems. |
| VIN | Main input supply | 2.75V–5.5V input rail; requires local 10µF ceramic decoupling to PGND to stabilize high-frequency switching noise. |
| LX1 / LX2 | Channel 1 / Channel 2 switch node | Connection point to inductor; carries high di/dt square-wave current - must be routed with minimal loop area to reduce EMI. |
| SYNC | Mode selection & synchronization input | Logic-level pin: HIGH → PFM mode; LOW → forced PWM; external clock edge-triggered sync up to 4MHz for EMI reduction. |
| PG | Power-good open-drain output | 1ms-delayed active-low signal indicating both outputs are within ±8% regulation; includes internal 1MΩ pull-up for direct µP reset interface. |
| NC | No-connect | Internally unused; recommended to tie to exposed pad for mechanical stability and thermal conduction. |
| Pad | Exposed thermal pad | Must be soldered to PGND plane; primary thermal path - insufficient vias cause junction temperature rise and premature thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Selectable PFM/PWM operation | Reduces light-load quiescent current to 30µA while maintaining 2.25MHz operation under full load - eliminates efficiency trade-off between battery runtime and EMI. |
| 100% duty cycle capability | Enables dropout operation down to VOUT + ILOAD × RDS(on) - extends usable battery range in 12V-to-3.3V or 5V-to-1.8V automotive applications. |
| Internal digital soft-start (2ms) | Prevents inrush current during startup even with prebiased outputs - avoids bus droop in shared-input systems like head unit power domains. |
| Soft-stop output discharge | Activates 100Ω internal switch on disable - safely discharges output caps to prevent back-powering or latch-up in hot-swap scenarios. |
| AEC-Q100 qualified | Validated for automotive Grade 2 (−40°C to +105°C ambient) with HTOL, TC, ESD (3kV HBM), and latch-up testing - suitable for ASIL-B supporting functions. |
Applications
| Rear Camera Systems | Navigation Systems |
|---|---|
Use Scenario: Powering image sensor, ISP, and MIPI transmitter in automotive rear-view camera modules with strict EMI limits and cold-crank tolerance. IC Role / Device Role / Timing Role: Dual-output POL regulator supplying 1.8V (sensor core) and 2.5V (MIPI I/O) simultaneously from 5V domain, with PFM mode for standby current <50µA. Use Value: Meets CISPR-25 Class 5 radiated emissions due to 2.25MHz fixed frequency above AM band and in-phase switching reducing differential-mode noise. | Use Scenario: Providing clean, sequenced power to GPS baseband processor, display controller, and audio codec in in-dash navigation units. IC Role / Device Role / Timing Role: Dual buck generating 1.2V (CPU core) and 3.3V (interface/bus) with independent EN1/EN2 for controlled power-up order and PG for system reset assertion. Use Value: 1ms PG delay aligns with µP reset timing requirements; 100% duty cycle maintains 3.3V output during 6V cold-crank events. |
| Infotainment Systems | DC/DC POL Modules |
Use Scenario: Supplying multiple voltage rails in centralized infotainment head units with thermal constraints inside sealed enclosures. IC Role / Device Role / Timing Role: Dual 800mA regulator delivering 1.5V (DDR memory) and 1.8V (SoC I/O) with thermal shutdown at 150°C and 25°C hysteresis for reliable recovery. Use Value: 3mm×3mm DFN footprint and <1.8cm² total solution size enable dense layout in space-limited dashboards. | Use Scenario: Embedded point-of-load converter in modular automotive ECUs requiring high reliability and minimal BOM count. IC Role / Device Role / Timing Role: Fully integrated dual buck with internal MOSFETs, compensation, soft-start, and PG - eliminates need for external op-amps or discrete FET drivers. Use Value: Reduces component count by ≥7 parts vs. discrete controller+MOSFET solutions while meeting AEC-Q100 and PPAP documentation requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ2172GJ-A | Single-channel 2A output; no PFM mode; 2.2MHz fixed frequency; QFN-10 package (3×3mm) | Requires two devices for dual-rail support; lacks light-load efficiency optimization and PG monitoring | Select when higher per-channel current (>1A) is required and system-level power sequencing is handled externally. |
| TPS62231DRVR | Single-channel 600mA; 3MHz fixed frequency; 2.5V–6V input; no SYNC pin; smaller 2×2mm DFN | Lower current rating; no dual-channel integration; no automotive qualification or thermal shutdown hysteresis | Choose for cost-sensitive non-automotive portable applications where board space is more critical than AEC-Q100 compliance. |
Compared with MPQ2172GJ-A and TPS62231DRVR, the ISL78228ARZ uniquely delivers dual 800mA outputs with automotive-grade reliability, selectable PFM/PWM for battery longevity, and integrated PG signaling - making it the only single-package solution for AEC-Q100-compliant dual-rail automotive POL needs.
Availability
ISL78228ARZ is available at Aetrix Electronics and suitable for rear camera systems, navigation systems, and infotainment systems requiring stable component supply with automotive-grade lifecycle assurance and traceable sourcing.
Supply support for ISL78228ARZ 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 automotive SoCs, with deep expertise in functional safety and ASIL-compliant design.
The ISL78228ARZ belongs to Renesas' automotive-qualified power management portfolio, engineered specifically for high-efficiency, low-noise DC/DC conversion in infotainment, ADAS, and body electronics where AEC-Q100 compliance and thermal robustness are mandatory.
FAQ
What is the maximum output current per channel for the ISL78228ARZ?
The ISL78228ARZ delivers up to 800mA continuous output current per channel across the full −40°C to +105°C automotive temperature range. Peak current limit is 1.2A typical, with overcurrent protection triggering at ≈1.2A (590mV CSA threshold). This rating assumes proper thermal design using the exposed pad and recommended 2.2µH inductors.
Does the ISL78228ARZ support power sequencing between its two outputs?
Yes, the ISL78228ARZ supports independent power sequencing via separate EN1 and EN2 pins. Each channel can be enabled or disabled individually with no interaction between outputs. When one channel is disabled, the PG pin monitors only the active channel, allowing flexible startup/shutdown ordering in multi-rail systems such as navigation head units.
How does the ISL78228ARZ achieve low quiescent current in battery-powered applications?
The ISL78228ARZ achieves 30µA total quiescent current (both channels) in PFM mode by dynamically reducing switching frequency at light loads while maintaining regulation. This is implemented via zero-cross detection and skip-mode control - not just frequency scaling - ensuring high efficiency down to microamp load levels typical in automotive always-on camera modules.
Can the ISL78228ARZ operate with a prebiased output during startup?
Yes, the ISL78228ARZ supports start-up with prebiased outputs. In forced PWM mode, it initiates soft-start in PFM mode first to avoid reverse current flow, then transitions to PWM once regulation is established. This prevents damage to downstream circuitry and ensures reliable boot in systems where output capacitors retain charge between power cycles.
What is the purpose of the NC pin on the ISL78228ARZ?
The NC pin (Pin 5) on the ISL78228ARZ is internally unconnected but is recommended to be tied to the exposed thermal pad for mechanical reinforcement and improved thermal conduction. It is not electrically functional, and leaving it floating has no impact on operation - however, soldering it to the pad enhances package reliability during thermal cycling in automotive environments.
ISL78228ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.75V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 800mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
ISL78228ARZ FAQ
1.How can I place an order for ISL78228ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78228ARZ 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 ISL78228ARZ reliable?
The price and inventory of ISL78228ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78228ARZ is usually 5 days.
3.What payment methods are accepted for ISL78228ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78228ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78228ARZ?
ISL78228ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78228ARZ 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 ISL78228ARZ?
For technical support, including ISL78228ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78228ARZ requirements.
6.How does Aetrix verify that ISL78228ARZ is sourced from the original manufacturer or authorized distributors?
All ISL78228ARZ 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 ISL78228ARZ meets industry standards.
7.What is the process for return or replacement of ISL78228ARZ?
All ISL78228ARZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL78228ARZ, 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 ISL78228ARZ part is unused and in its original packaging.
Return procedure for ISL78228ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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