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Renesas ISL78228ARZ-T
- Part No.:
- ISL78228ARZ-T
- Manufacturer:
- Renesas
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
ISL78228ARZ-T.pdf
- Description:
- IC REG BUCK ADJ 800MA DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,214
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Product details
Overview
ISL78228ARZ-T 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-frequency PWM or light-load PFM mode, 0.6V adjustable output, and AEC-Q100 qualification for automotive (-40°C to +105°C) applications including infotainment and rear camera power rails.
For engineers reviewing the ISL78228ARZ-T datasheet, ISL78228ARZ-T pinout, ISL78228ARZ-T application, or ISL78228ARZ-T equivalent, key selection criteria include dual-channel 800mA capability, 30µA quiescent current in PFM mode, 100% duty cycle dropout support, 1ms power-good monitoring, and 3mm×3mm DFN thermal performance under automotive temperature stress.
Technical Context
The ISL78228ARZ-T implements current-mode control with internal slope compensation and transconductance error amplifiers, enabling fast transient response and stable loop behavior across load and input variations. Its dual in-phase channels share a single oscillator and synchronized switching nodes (LX1/LX2), supporting coordinated soft-start and simultaneous PG assertion.
It integrates dual high-side P-MOSFETs (180mΩ typ. @ 5.5V) and low-side N-MOSFETs with overcurrent protection triggered at 590mV CSA output (≈1.2A peak), plus thermal shutdown at 150°C with 25°C hysteresis. The SYNC pin enables forced PWM, PFM, or external synchronization up to 4MHz with negative-edge triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current per Channel | 800mA continuous - supports dual-core µP/FPGA core and I/O rail power without external current boosting. |
| Switching Frequency | 2.25MHz (typ.) - enables use of 2.2µH inductors and 10µF ceramic capacitors, minimizing PCB area to <1.8cm² total. |
| Quiescent Current (PFM) | 30µA total for both channels - extends battery life in always-on automotive modules like navigation systems. |
| Feedback Reference Voltage | 0.600V ±10mV - sets precise output regulation down to 0.6V with external resistor divider scaling. |
| Power-Good Delay | 1ms fixed delay - provides deterministic system reset timing after both outputs stabilize within 88–96% of nominal voltage. |
| Thermal Resistance θJA | 49°C/W - validated on standard high-thermal-conductivity test board, enabling 1.2W dissipation at +105°C ambient. |
| Input Voltage Range | 2.75V to 5.5V - compatible with 3.3V and 5V supply rails while maintaining regulation through cold-crank automotive transients. |
Pinout & Package
ISL78228ARZ-T is housed in a RoHS-compliant 10-lead 3mm×3mm DFN package (L10.3x3C) with exposed thermal pad requiring connection to PGND via multiple vias for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1 / FB2 | Channel 1 / Channel 2 feedback input | Negative input to transconductance error amplifier; sets output voltage via resistor divider; monitors undervoltage fault. |
| EN1 / EN2 | Channel 1 / Channel 2 enable | Active-high logic control; initiates soft-start when asserted; discharges output capacitor during disable. |
| VIN | Main input supply | Accepts 2.75V–5.5V; requires local 10µF ceramic decoupling to PGND; powers internal bias circuitry and drivers. |
| LX1 / LX2 | Channel 1 / Channel 2 switch node | Connects to inductor high-side terminal; carries high di/dt switching current; must be routed with minimal loop area. |
| SYNC | Mode selection & sync input | Logic-high = PFM; logic-low = forced PWM; external clock input (2.7–4MHz) triggers on falling edge. |
| PG | Power-good open-drain output | 1ms-delayed active-low signal indicating both outputs are within regulation; includes internal 1MΩ pull-up. |
| NC | No-connect | Recommended to tie to exposed pad for mechanical stability and thermal conduction. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables ultra-low dropout during battery brownout (e.g., 3.0V input → 2.5V output), preserving system uptime. |
| Internal digital soft-start (2ms) | Prevents inrush current and output overshoot during power-up; ramps reference for both voltage and current loops. |
| Soft-stop output discharge | Activates 100Ω internal switch during shutdown, safely discharging output capacitors without external components. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use from −40°C to +105°C ambient, including ESD (3kV HBM), latch-up (100mA), and thermal cycling. |
| Start-up with prebiased output | Supports hot-swap and partial-power-down scenarios by initiating soft-start even when VOUT is initially non-zero. |
Applications
| Rear Camera Power Supply | Infotainment System Core Rail |
|---|---|
Use Scenario: Dual-rail power for CMOS image sensor (1.8V) and ISP processor (2.5V) in automotive rear-view cameras. IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing independent, low-noise, sequenced outputs with 1ms PG coordination. Use Value: Eliminates need for discrete regulators and external sequencing ICs; 30µA PFM quiescent current extends parking-mode battery life. |
Use Scenario: Core and I/O voltage generation for SoC-based head unit running Linux/QNX with real-time audio/video processing. IC Role / Device Role / Timing Role: Dual-channel POL converter delivering 800mA each at 1.2V and 3.3V with synchronized soft-start and PG assertion. Use Value: 2.25MHz operation allows compact 2.2µH inductors; AEC-Q100 qualification ensures reliability in thermally demanding dash environments. |
| Navigation System Memory Rail | FPGA Configuration Power |
Use Scenario: DDR3/DDR4 memory interface power in GPS/navigation units requiring tight voltage tolerance and fast load transient response. IC Role / Device Role / Timing Role: High-efficiency buck regulator supplying 1.5V/1.35V memory rails with <±1% line/load regulation and 100ns minimum on-time. Use Value: Current-mode control delivers sub-10µs transient recovery; 0.6V reference enables accurate scaling for low-voltage memory standards. |
Use Scenario: Configurable dual-rail supply for Xilinx/Intel FPGA I/O banks (2.5V) and core logic (1.0V) in ADAS domain controllers. IC Role / Device Role / Timing Role: Adjustable-output buck regulator supporting programmable VCCINT/VCCIO with independent enable and PG monitoring. Use Value: External resistor divider enables precise voltage tuning; 100% duty cycle maintains FPGA operation during 12V battery sag to 6V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ2169GJ-AEC1-Z | Single-channel 600mA, 2.2MHz, 2.7–5.5V input; no PFM mode; 0.8V ref; 8-pin QFN | Lower per-channel current; lacks dual-channel integration and light-load efficiency optimization | Select when only one regulated rail is needed and cost-per-rail is prioritized over integration. |
| TPS62231DRVR | Single-channel 600mA, 3–6V input, 2.25MHz, 0.6V ref; PFM/PWM auto-mode; 6-pin WSON | Single-output only; no dual-channel PG coordination or synchronized enable; not AEC-Q100 qualified | Choose for non-automotive portable applications where AEC-Q100 and dual-rail coordination are unnecessary. |
Compared with MPQ2169GJ-AEC1-Z and TPS62231DRVR, the ISL78228ARZ-T uniquely delivers dual 800mA channels with AEC-Q100 qualification, coordinated 1ms PG, and 30µA PFM quiescent current-making it the only option for space-constrained, safety-aware automotive dual-rail designs requiring guaranteed thermal and reliability validation.
Availability
ISL78228ARZ-T is available at Aetrix Electronics and suitable for automotive infotainment systems, rear camera modules, and navigation units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL78228ARZ-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 delivering microcontrollers, analog power, and connectivity solutions for automotive, industrial, and IoT markets with strong emphasis on functional safety and AEC-Q100 compliance.
The ISL78228 belongs to Renesas' automotive-grade power management portfolio, designed specifically for high-reliability DC/DC point-of-load conversion in ADAS, infotainment, and body electronics where thermal robustness and startup predictability are critical.
FAQ
What is the maximum output current per channel for the ISL78228ARZ-T?
The ISL78228ARZ-T delivers up to 800mA continuous output current per channel under recommended operating conditions (VIN = 2.75V–5.5V, TA = −40°C to +105°C). Peak current limit is 1.2A typical, verified by internal overcurrent protection that trips at 590mV CSA output voltage corresponding to ≈1.2A through the high-side P-MOSFET.
Does the ISL78228ARZ-T support adjustable output voltage?
Yes, the ISL78228ARZ-T supports fully adjustable output voltage from 0.6V to VIN−dropout using external resistor dividers on FB1 and FB2 pins. The internal 0.600V ±10mV bandgap reference enables precise scaling; typical applications set 1.8V and 2.5V outputs as shown in the datasheet's Figure 2 schematic.
How does the ISL78228ARZ-T manage power sequencing between its two channels?
The ISL78228ARZ-T provides independent EN1 and EN2 pins for per-channel enable control, allowing flexible power sequencing. Each channel features internal 2ms digital soft-start, and the shared PG pin asserts only after both outputs reach regulation within 88–96% of nominal voltage with a fixed 1ms delay-enabling reliable system-level reset coordination.
What thermal performance can be expected from the ISL78228ARZ-T in a 3mm×3mm DFN package?
In its 10-lead 3mm×3mm DFN package with exposed thermal pad connected to PGND, the ISL78228ARZ-T achieves θJA = 49°C/W (typ.) and θJC = 4°C/W (typ.). This allows sustained 1.2W power dissipation at +105°C ambient, validated under AEC-Q100 thermal cycling and confirmed by built-in thermal shutdown at 150°C with 25°C hysteresis.
Is the ISL78228ARZ-T qualified for automotive applications?
Yes, the ISL78228ARZ-T is AEC-Q100 Grade 1 qualified (−40°C to +105°C), with full validation including ESD (3kV HBM), latch-up (100mA), and thermal shock testing. It is explicitly targeted for automotive infotainment, rear camera, navigation, and ADAS subsystems where reliability under harsh environmental stress is mandatory.
ISL78228ARZ-T 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-T FAQ
1.How can I place an order for ISL78228ARZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78228ARZ-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 ISL78228ARZ-T reliable?
The price and inventory of ISL78228ARZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78228ARZ-T is usually 5 days.
3.What payment methods are accepted for ISL78228ARZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78228ARZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78228ARZ-T?
ISL78228ARZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78228ARZ-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 ISL78228ARZ-T?
For technical support, including ISL78228ARZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78228ARZ-T requirements.
6.How does Aetrix verify that ISL78228ARZ-T is sourced from the original manufacturer or authorized distributors?
All ISL78228ARZ-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 ISL78228ARZ-T meets industry standards.
7.What is the process for return or replacement of ISL78228ARZ-T?
All ISL78228ARZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL78228ARZ-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 ISL78228ARZ-T part is unused and in its original packaging.
Return procedure for ISL78228ARZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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