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Renesas ISL78228ARZ-T7A
- Part No.:
- ISL78228ARZ-T7A
- Manufacturer:
- Renesas
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
ISL78228ARZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:363
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Product details
Overview
ISL78228ARZ-T7A from Renesas Electronics is a dual-channel synchronous buck regulator delivering 800mA per channel, operating from 2.75V–5.5V input with 2.25MHz fixed switching frequency and adjustable 0.6V–VIN output voltage. It features selectable forced PWM or PFM mode, 1ms power-good monitoring, and AEC-Q100 qualification for automotive infotainment and camera systems.
For engineers reviewing the ISL78228ARZ-T7A datasheet, ISL78228ARZ-T7A pinout, ISL78228ARZ-T7A application, or ISL78228ARZ-T7A equivalent, key selection criteria include light-load efficiency (30µA quiescent current in PFM), dual-channel synchronization capability (up to 4MHz), internal soft-start (2ms), thermal shutdown (150°C), and 10-lead 3×3mm DFN package with exposed thermal pad.
Technical Context
The ISL78228ARZ-T7A implements current-mode control with integrated P- and N-channel MOSFETs (180mΩ typical RDS(on)), enabling fast transient response and stable loop performance across 0–800mA load range. Its dual in-phase channels share a single oscillator and support independent enable (EN1/EN2) and feedback (FB1/FB2) paths.
Operation includes three distinct modes: forced PWM (SYNC = low) for low-noise operation, PFM (SYNC = high) for ultra-low quiescent current, and external synchronization (SYNC = 2.7–4MHz clock) for EMI reduction. The 100% duty cycle capability ensures minimal dropout during battery brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current (per channel) | 800mA continuous - supports µC/FPGA core rails and camera sensor biasing without external boost stages. |
| Switching Frequency | 2.25MHz (typical) - enables use of compact 2.2µH inductors and 10µF ceramic output capacitors, reducing total solution area to <1.8cm². |
| Quiescent Current (PFM) | 30µA (total, both channels) - extends battery runtime in always-on automotive modules like rear-view cameras. |
| Feedback Reference Voltage | 0.600V ±10mV - sets precise output regulation down to 0.6V, supporting low-voltage DSP and memory I/O rails. |
| Power-Good Delay | 1ms (rising edge) - provides deterministic system reset timing for sequenced power-up of microcontrollers and peripherals. |
| Thermal Shutdown Threshold | 150°C with 25°C hysteresis - protects against sustained overload or poor PCB thermal design while enabling automatic recovery. |
| Input Voltage Range | 2.75V to 5.5V - compatible with 3.3V and 5V automotive supply rails, including post-regulated battery domains. |
Pinout & Package
ISL78228ARZ-T7A is housed in a RoHS-compliant 10-lead 3mm × 3mm DFN package (L10.3x3C) with 1mm max height and thermally enhanced exposed pad requiring connection to PGND via multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 / FB2 | Channel 1 / Channel 2 feedback input | Connects to resistor divider to set output voltage; internal 0.6V reference enables 0.6V–VIN programmability with ±1.7% regulation accuracy. |
| EN1 / EN2 | Channel 1 / Channel 2 enable input | Active-high logic control; drives output into soft-discharge state (100Ω internal switch) when low, enabling precise power sequencing. |
| VIN | Main input supply | Accepts 2.75V–5.5V; requires local 10µF ceramic decoupling to PGND for stability and noise suppression. |
| LX1 / LX2 | Channel 1 / Channel 2 switch node | Connects directly to inductor high-side terminal; rated for -1.5V to 6.5V with 100ns pulse tolerance. |
| PG | Power-good open-drain output | 1ms-delayed active-low signal indicating both outputs are within ±8% regulation; includes internal 1MΩ pull-up. |
| SYNC | Mode selection & sync input | Logic-level configurable: low = forced PWM, high = PFM, external clock edge-triggered = synchronized operation up to 4MHz. |
| NC | No-connect | Internally unused; recommended to connect to exposed thermal pad for mechanical stability and thermal relief. |
| Exposed Pad | Thermal & ground reference | Must be soldered to PGND plane; primary thermal path-thermal resistance θJA = 49°C/W, θJC = 4°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel in-phase operation | Enables interleaved or independent regulation without phase-shift complexity-ideal for split-rail SoC supplies. |
| Internal digital soft-start (2ms) | Prevents inrush current and output overshoot during startup; ramp time is fixed and unadjustable. |
| Soft-stop output discharge | Activates 100Ω internal switch on disable, discharging output capacitors to <100mV in <1ms-critical for safe hot-swap and fault recovery. |
| Overcurrent protection (OCP) | Peak-current limiting at 1.2A (typ) per channel with immediate P-MOSFET turn-off-protects against short-circuit and overload events. |
| AEC-Q100 Grade 1 qualification | Rated for -40°C to +105°C ambient operation with full electrical characterization across temperature-validated for automotive front/rear camera and infotainment ECUs. |
Applications
| Rear Camera Power Supply | Infotainment System Core Rail |
|---|---|
Use Scenario: Powers image sensor, ISP, and interface circuitry in automotive rear-view camera modules with always-on capability. IC Role / Device Role / Timing Role: Dual-output DC/DC regulator providing 1.8V for sensor logic and 2.5V for analog front-end, with PFM mode minimizing standby current. Use Value: 30µA total quiescent current extends vehicle battery life during extended parking; 1ms PG ensures clean boot sequence for camera initialization. | Use Scenario: Supplies core voltage to ARM-based infotainment SoCs requiring tightly regulated, low-noise 1.2V/1.5V rails. IC Role / Device Role / Timing Role: Dual synchronous buck converter delivering independent, sequenced outputs with EN1/EN2 control and soft-start coordination. Use Value: 2.25MHz switching avoids AM band interference; internal compensation eliminates need for external compensation components. |
| Navigation System Memory I/O | FPGA Configuration Power |
Use Scenario: Generates 3.3V and 1.8V rails for LPDDR memory interfaces and display controllers in GPS navigation units. IC Role / Device Role / Timing Role: Adjustable-output buck regulator supporting dynamic voltage scaling via FB divider; 100% duty cycle maintains regulation during battery sag. Use Value: Input range (2.75–5.5V) accommodates wide automotive battery variation; thermal shutdown prevents damage during enclosure overheating. | Use Scenario: Provides stable 1.2V and 2.5V configuration voltages for Xilinx/Intel FPGA I/O banks and core logic during cold-boot and reconfiguration. IC Role / Device Role / Timing Role: Dual-channel POL regulator with independent enable and PG monitoring-ensures FPGA config integrity before release of INIT_B. Use Value: 1ms PG delay aligns with FPGA power-on reset timing; SYNC pin allows synchronization to system clock to reduce beat-frequency noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | Single-channel, 600mA, 2.25MHz, 0.6V ref; no PFM mode or PG output. | Lacks dual output, power-good, and automotive qualification-suitable only for non-critical consumer portable devices. | Select only if single-rail, non-automotive, and cost-sensitive; not drop-in replaceable. |
| MP2144GJ-Z | Dual-channel, 800mA, 2.2MHz, 0.6V ref; no AEC-Q100 rating, no SYNC pin, no soft-discharge. | Not qualified for automotive use; lacks critical safety features (PG, thermal hysteresis, UVLO) required in ECU designs. | Consider for industrial or commercial applications where AEC-Q100 and soft-stop are not mandatory. |
Compared with TPS62231DRYT and MP2144GJ-Z, the ISL78228ARZ-T7A uniquely combines AEC-Q100 Grade 1 qualification, dual-channel PFM/PWM mode selection, 1ms power-good, and soft-discharge functionality-making it the only option validated for safety-critical automotive camera and infotainment power domains.
Availability
ISL78228ARZ-T7A is available at Aetrix Electronics and suitable for automotive rear camera systems, infotainment head units, and navigation ECUs requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for ISL78228ARZ-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 specializing in microcontrollers, analog power management, and automotive SoCs, with deep expertise in functional-safety and AEC-Q100-compliant solutions.
The ISL78228 belongs to Renesas' automotive-grade power management portfolio, designed specifically for ADAS and infotainment subsystems requiring high efficiency, small footprint, and robust thermal and electrical reliability under harsh automotive conditions.
FAQ
What is the maximum output voltage that can be set using the ISL78228ARZ-T7A?
The ISL78228ARZ-T7A supports output voltages from 0.6V up to the input voltage (VIN), limited only by the 100% duty cycle capability and converter losses. With VIN = 5.5V, the practical maximum is ~5.3V. The feedback resistors must be selected to maintain the FB pin at 0.6V, and the datasheet confirms operation down to 0.6V with ±1.7% regulation accuracy across temperature.
Does the ISL78228ARZ-T7A support prebiased output startup?
Yes, the ISL78228ARZ-T7A supports startup with prebiased outputs. In forced PWM mode, the IC initiates soft-start even when the output capacitor is precharged, preventing reverse current flow and ensuring controlled ramp-up. This behavior is explicitly documented in the "Theory of Operation" section of the FN7849 datasheet.
How does the ISL78228ARZ-T7A handle overcurrent conditions?
The ISL78228ARZ-T7A uses peak-current limiting per channel, tripping at 1.2A (typical) when the CSA amplifier output reaches 590mV. Upon detection, the P-MOSFET turns off immediately and remains off until the next switching cycle. This cycle-by-cycle protection prevents thermal runaway during short-circuit events on either output rail.
Can the two channels of the ISL78228ARZ-T7A be synchronized to an external clock?
Yes-the SYNC pin accepts an external clock signal with negative-edge triggering, supporting synchronization frequencies from 2.7MHz to 4MHz. When driven by an external source, the ISL78228ARZ-T7A aligns its PWM edges to the falling edge of the SYNC input, enabling EMI reduction and noise cancellation in multi-converter systems.
What is the thermal performance of the ISL78228ARZ-T7A in its 3×3mm DFN package?
The ISL78228ARZ-T7A has a junction-to-ambient thermal resistance (θJA) of 49°C/W and junction-to-case (θJC) of 4°C/W in the 10-lead 3×3mm DFN package. With proper PCB layout-including connection of the exposed pad to a large PGND plane via ≥4 thermal vias-it sustains 800mA per channel continuously at +105°C ambient without thermal shutdown.
ISL78228ARZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-T7A FAQ
1.How can I place an order for ISL78228ARZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78228ARZ-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 ISL78228ARZ-T7A reliable?
The price and inventory of ISL78228ARZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78228ARZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL78228ARZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78228ARZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78228ARZ-T7A?
ISL78228ARZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78228ARZ-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 ISL78228ARZ-T7A?
For technical support, including ISL78228ARZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78228ARZ-T7A requirements.
6.How does Aetrix verify that ISL78228ARZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL78228ARZ-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 ISL78228ARZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL78228ARZ-T7A?
All ISL78228ARZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL78228ARZ-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 ISL78228ARZ-T7A part is unused and in its original packaging.
Return procedure for ISL78228ARZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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