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Renesas ISL78208ARZ
- Part No.:
- ISL78208ARZ
- Manufacturer:
- Renesas
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL78208ARZ.pdf
- Description:
- IC REG BUCK ADJ 3A DL 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,782
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Product details
Overview
ISL78208ARZ from Renesas Electronics is a dual-channel automotive-grade synchronous buck regulator with integrated 3A-per-channel N-Channel MOSFETs, 4.5V–28V input range, peak current mode control, and independent 3A continuous output capability per channel. It delivers regulated 0.8V–output voltages for DSP/processor core and I/O rails in infotainment systems.
For engineers reviewing the ISL78208ARZ datasheet, ISL78208ARZ pinout, ISL78208ARZ application, or ISL78208ARZ equivalent, key selection considerations include its 500kHz default switching frequency (adjustable 300kHz–2MHz), independent soft-start (2ms internal), out-of-phase PWM operation, and automotive-grade thermal protection up to +105°C ambient.
Technical Context
The ISL78208ARZ implements peak current mode control with dual independent error amplifiers (COMP1/COMP2), programmable oscillator (FS pin or SYNCIN), and separate enable/soft-start/PGOOD pins per channel. Its architecture supports in-phase or 180° out-of-phase operation via SYNCIN logic level, enabling ripple cancellation or current sharing.
Each channel integrates a high-side N-MOSFET (RDS(on) = 75–150mΩ) with bootstrap gate drive (BOOT1/BOOT2), external Schottky diode requirement, and dedicated power ground (PGND1/PGND2) and signal ground (SGND) separation. Protection includes cycle-by-cycle overcurrent (4.1–6.1A threshold), thermal shutdown at +150°C, and BOOT undervoltage detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports wide automotive battery transients including cold-crank and load-dump conditions. |
| Output Current (per channel) | 3A continuous - enables dual-rail power delivery without external current-sharing circuitry. |
| Switching Frequency | Default 500kHz; adjustable 300kHz–2MHz via FS resistor or SYNCIN - balances efficiency, size, and EMI. |
| Reference Voltage | 0.792V to 0.808V - tight 1% tolerance enables precise output regulation down to 0.8V. |
| Operating Temperature | −40°C to +105°C - qualified for under-hood automotive applications per AEC-Q100. |
| Package | 32-pin Wettable Flank QFN (5mm × 5mm) - supports automated optical inspection (AOI) and enhanced thermal dissipation (θJA = 30°C/W). |
| Protection Features | Overcurrent (OCP), UVLO, thermal shutdown (+150°C), BOOT UV detection - ensures robust fault recovery in harsh environments. |
Pinout & Package
ISL78208ARZ is housed in a 5mm × 5mm, 32-lead Wettable Flank Quad Flat No-Lead (WFQFN) package with exposed thermal pad (EPAD) soldered to SGND. The package supports Pb-free (RoHS-compliant) reflow and meets MSL3 moisture sensitivity requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 / VIN2 | Input power supply for Channel 1 / Channel 2 | Accepts 4.5V–28V; requires ≥10µF ceramic decoupling per input to minimize noise and ensure stability. |
| PHASE1 / PHASE2 | Switch node output | Connects internal N-MOSFET source to external inductor and Schottky diode cathode; high dV/dt node requiring careful layout. |
| BOOT1 / BOOT2 | Floating bootstrap supply | Drives high-side MOSFET gate; requires external capacitor (typically 0.1µF) between BOOTx and PHASEx. |
| FB1 / FB2 | Feedback input | Negative input of error amplifier; sets output voltage via resistor divider; monitors regulation and triggers PGOOD. |
| EN1 / EN2 | Enable control | Active-high logic input; >2V enables channel; <0.8V disables; no internal debouncing required. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicator | Pulled low during soft-start or undervoltage; internal 5MΩ pull-up; used for sequencing and system monitoring. |
| SS1 / SS2 | Soft-start timing | Capacitor-to-ground sets ramp rate; tied to VCC for fixed 2ms internal soft-start. |
| SYNCIN / SYNCOUT | Frequency synchronization interface | SYNCIN accepts 300kHz–2MHz external clock (negative-edge triggered); SYNCOUT provides inverted signal for multi-device sync. |
| FS | Frequency select | Tied to VCC for 500kHz; resistor to GND adjusts frequency from 300kHz to 2MHz. |
| COMP1 / COMP2 | Error amplifier output | Provides compensation node for external Type-II/III loop filter; critical for stability across load/line variations. |
| PGND1 / PGND2 / SGND | Ground connections | Separate power grounds per channel reduce noise coupling; SGND is reference for all analog signals and must connect to EPAD. |
| NC1–NC5 | No-connect terminals | Not internally bonded; must remain unconnected per datasheet to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Independent tracking/sequencing | Supports ratiometric, absolute, sequential, or independent startup via SS1/SS2 and EN1/EN2 - enables safe powering of multi-rail SoCs. |
| Out-of-phase PWM operation | 180° phase shift between channels when SYNCIN = logic 0 or external clock - reduces input ripple current by ~70% vs. in-phase. |
| Integrated 5V LDO (VCC) | Internal linear regulator powers internal bias circuits; supplies ≤10mA; requires 4.7µF ceramic decoupling to PGND. |
| Current-mode control | Peak current sensing with 0.21V/A gain enables fast transient response and inherent line feedforward - simplifies loop compensation design. |
| Wettable flank package | Side-wettable leads enable automated AOI inspection of solder joints - critical for automotive manufacturing traceability and reliability. |
Applications
| Infotainment System Power | DSP/Embedded Processor Core Rail |
|---|---|
|
Use Scenario: Powering head-unit main processor, GPU, and display controller in automotive infotainment units. IC Role / Device Role / Timing Role: Dual-channel buck regulator delivering independent 1.1V core and 3.3V I/O rails with synchronized soft-start. Use Value: Enables single-chip solution for multi-voltage rail generation while meeting AEC-Q100 temperature and reliability requirements. |
Use Scenario: Supplying variable-core-voltage (VCORE) and memory I/O rails for automotive ADAS processors. IC Role / Device Role / Timing Role: Regulator providing tightly regulated 0.8V–1.3V outputs with ±1% reference accuracy and fast load-step response. Use Value: Maintains stable core voltage during dynamic DVFS transitions, reducing system-level power loss by up to 15% vs. discrete solutions. |
| Automotive Camera Module Power | Telematics Control Unit (TCU) Power |
|
Use Scenario: Powering image sensor, ISP, and SerDes in rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: Dual-output regulator supplying 1.8V sensor rail and 1.2V ISP rail with independent PGOOD signaling. Use Value: Eliminates need for external sequencing IC; reduces BOM count by two regulators and associated passives. |
Use Scenario: Providing primary 5V and secondary 3.3V rails for LTE/C-V2X modems and microcontrollers in telematics gateways. IC Role / Device Role / Timing Role: High-efficiency buck converter operating across 6V–24V vehicle battery range with load dump immunity. Use Value: Achieves >90% efficiency at 2A load (VIN=13.5V), minimizing thermal stress in sealed TCU enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4420AGL-A-Z | Single-channel 2A buck; no integrated MOSFET gate driver; requires external high-side FET and bootstrap circuit. | Lacks dual-channel integration and automotive temp rating; rated only to +85°C ambient. | Choose when lower cost and simpler layout outweigh need for dual-rail integration and extended temperature support. |
| TPS543B20RTWT | Single-channel 15A buck with integrated FETs; uses D-CAP3 control; supports PMBus for telemetry. | Higher current per channel but no dual-output capability; lacks independent soft-start and tracking modes. | Prefer for high-current single-rail applications where digital monitoring and tighter voltage margins are prioritized over dual-rail flexibility. |
Compared with MPQ4420AGL-A-Z and TPS543B20RTWT, the ISL78208ARZ uniquely delivers dual 3A channels with automotive qualification, independent sequencing, and wettable-flank packaging-making it optimal for space-constrained, safety-critical dual-rail automotive subsystems.
Availability
ISL78208ARZ is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and telematics control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL78208ARZ 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 ICs, with deep expertise in functional safety and AEC-Q100-qualified products.
The ISL78208ARZ belongs to Renesas' ISL78xxx automotive power management family, designed specifically for high-reliability, wide-input DC/DC conversion in infotainment, body electronics, and ADAS subsystems.
FAQ
What is the maximum continuous output current per channel for the ISL78208ARZ?
The ISL78208ARZ delivers 3A continuous output current per channel under recommended operating conditions (TA ≤ +105°C, proper thermal layout). This is validated across the full −40°C to +105°C automotive temperature range with adequate PCB copper area and thermal vias to the EPAD.
Does the ISL78208ARZ require an external Schottky diode, and why?
Yes, the ISL78208ARZ requires an external Schottky diode connected from PHASEx to VOUTx. Because it integrates only the high-side N-MOSFET, the diode provides the low-side conduction path during the off-time. A Schottky diode (e.g., B340B) is specified to minimize forward voltage drop and improve efficiency, especially at light loads.
How does the ISL78208ARZ achieve output voltage tracking during startup?
The ISL78208ARZ supports four tracking modes-ratiometric, absolute, sequential, and independent-via configuration of SS1/SS2 and EN1/EN2. Ratiometric tracking ties both soft-start ramps together using shared capacitor networks, ensuring proportional voltage rise; absolute tracking forces identical ramp rates regardless of setpoint.
Can the ISL78208ARZ operate in current-sharing mode for higher output current?
Yes, the ISL78208ARZ supports parallel operation of both channels to deliver up to 6A on a single output rail. Figure 3 in the FN8354 datasheet shows the current-sharing configuration using external resistors and matched inductors. Phase interleaving (180° out-of-phase) reduces input/output ripple and improves thermal distribution.
What is the purpose of the exposed thermal pad (EPAD) on the ISL78208ARZ package?
The EPAD on the ISL78208ARZ must be soldered to SGND and connected to the PCB ground plane using ≥9 thermal vias (0.3mm diameter). It serves as the primary thermal conduction path-reducing θJA from >50°C/W to 30°C/W-and also functions as the signal reference for internal analog blocks, improving noise immunity and regulation accuracy.
ISL78208ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 26V
- Current - Output:
- 3A
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 32-QFN (5x5)
ISL78208ARZ FAQ
1.How can I place an order for ISL78208ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78208ARZ 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 ISL78208ARZ reliable?
The price and inventory of ISL78208ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78208ARZ is usually 5 days.
3.What payment methods are accepted for ISL78208ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78208ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78208ARZ?
ISL78208ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78208ARZ 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 ISL78208ARZ?
For technical support, including ISL78208ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78208ARZ requirements.
6.How does Aetrix verify that ISL78208ARZ is sourced from the original manufacturer or authorized distributors?
All ISL78208ARZ 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 ISL78208ARZ meets industry standards.
7.What is the process for return or replacement of ISL78208ARZ?
All ISL78208ARZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL78208ARZ, 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 ISL78208ARZ part is unused and in its original packaging.
Return procedure for ISL78208ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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