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Renesas ISL78208ARZ-T7A
- Part No.:
- ISL78208ARZ-T7A
- Manufacturer:
- Renesas
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL78208ARZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 3A DL 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,382
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Product details
Overview
ISL78208ARZ-T7A from Renesas Electronics is a dual-channel automotive-grade synchronous buck regulator with integrated 3A N-Channel MOSFETs per channel, 4.5V–28V input range, 500kHz default switching frequency (adjustable 300kHz–2MHz), and independent power-good outputs. It delivers stable 5V/3.3V point-of-load power for infotainment systems and embedded processors.
For engineers reviewing the ISL78208ARZ-T7A datasheet, ISL78208ARZ-T7A pinout, ISL78208ARZ-T7A application, or ISL78208ARZ-T7A equivalent, key selection considerations include dual-output tracking modes, out-of-phase PWM operation for reduced input ripple, thermal shutdown at +150°C, and wettable flank QFN package compatibility with automated optical inspection (AOI).
Technical Context
The ISL78208ARZ-T7A implements peak current mode control with internal error amplifiers (gm = 125–285 µA/V) and programmable soft-start (2ms internal, adjustable via external capacitor). Each channel features independent enable (EN1/EN2), feedback (FB1/FB2), and compensation (COMP1/COMP2) pins, enabling flexible output sequencing-ratiometric, absolute, or independent.
It supports three synchronization modes via SYNCIN: in-phase (SYNCIN = logic high), out-of-phase (SYNCIN = logic low or floating), or external clock sync (300kHz–2MHz, negative-edge triggered). The FS pin sets nominal frequency (500kHz when tied to VCC) or enables resistor-programmable operation (300kHz–2MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports wide automotive battery transients including cold-crank (4.5V) and load-dump (28V) conditions. |
| Output Current per Channel | 3A continuous - sufficient for powering dual-core DSPs or multi-rail SoCs without external current sharing. |
| Switching Frequency | 500kHz default (FS = VCC); adjustable 300kHz–2MHz - enables optimization of size (higher fSW → smaller inductors) vs. efficiency (lower fSW → lower switching loss). |
| Reference Voltage | 0.792V to 0.808V - tight 1% tolerance enables accurate output regulation down to 0.8V (e.g., core rails). |
| Operating Temperature | −40°C to +105°C - qualified for under-hood automotive applications per AEC-Q100 requirements. |
| Package | 32-pin Wettable Flank QFN (5mm × 5mm) - supports AOI inspection and improves thermal performance (θJC = 1.5°C/W). |
| Protection Features | Overcurrent (4.1–6.1A threshold), thermal shutdown (+150°C), UVLO (rising POR = 3.9–4.4V), BOOT undervoltage detection - ensures robust fault recovery in harsh environments. |
Pinout & Package
The ISL78208ARZ-T7A is housed in a 5mm × 5mm, 32-lead Wettable Flank Quad Flat No-Lead (WFQFN) package with exposed thermal pad (EPAD) soldered to SGND. Pin 1 is marked by dot; top-view pin numbering follows standard QFN layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 / VIN2 | Power input supply for respective buck channel | Each requires ≥10µF ceramic decoupling close to pin; accepts 4.5–28V unregulated input. |
| PHASE1 / PHASE2 | Switch node output | Connects internal N-MOSFET source to external inductor and Schottky diode cathode; drives high dv/dt waveform. |
| BOOT1 / BOOT2 | Floating gate drive supply | Requires external bootstrap capacitor (Cboot) from BOOTx to PHASEx to sustain high-side MOSFET conduction. |
| FB1 / FB2 | Negative input to voltage loop error amplifier | Sets output voltage via resistor divider; also used by PG and UVLO circuits for regulation monitoring. |
| PGOOD1 / PGOOD2 | Open-drain power-good status | Pulled low during soft-start or if output falls below 91% (rise) / 82.5% (fall) of target; internal 5MΩ pull-up. |
| EN1 / EN2 | Enable control inputs | Active-high; enable threshold = 2V; disable when ≤0.8V; no internal debouncing required. |
| SS1 / SS2 | Soft-start timing control | Capacitor-to-ground sets ramp rate; tying to VCC enables fixed 2ms internal soft-start. |
| SYNCIN / SYNCOUT | External clock interface | SYNCIN accepts 300kHz–2MHz negative-edge clock; SYNCOUT provides inverted copy for daisy-chaining. |
Key Features
| Feature | Design Value |
|---|---|
| Independent output tracking modes | Supports ratiometric, absolute, sequential, or independent startup - critical for multi-rail SoC power sequencing compliance. |
| Out-of-phase PWM operation | Reduces input capacitance requirement by ~50% compared to in-phase operation - lowers system BOM cost and footprint. |
| Internal 5V LDO (VCC) | Provides bias for internal circuitry; rated for ≤10mA load - eliminates need for external bias rail in most designs. |
| Wettable flank package | Enables automated optical inspection of solder joints - improves manufacturing yield and field reliability in automotive production. |
| Hiccup-mode short-circuit protection | Enters current-limited restart cycle on overload - prevents thermal runaway while maintaining system awareness during fault. |
Applications
| Infotainment System Power | DSP/Embedded Processor Core Supply |
|---|---|
Use Scenario: Powering head-unit MCU, audio codec, and display controller from 12V vehicle battery. IC Role / Device Role / Timing Role: Dual-output buck regulator delivering 5V (peripherals) and 3.3V (logic) with independent sequencing and hiccup-mode fault protection. Use Value: Meets AEC-Q100 Grade 2 temperature requirements and withstands automotive transients without external supervision. | Use Scenario: Supplying dual-core ADAS processor requiring tightly tracked 1.2V and 1.8V rails with <100ns inter-rail skew. IC Role / Device Role / Timing Role: Configured in ratiometric tracking mode with shared SS capacitor to ensure monotonic, slope-matched voltage ramps. Use Value: Eliminates need for external tracking IC or discrete sequencing circuitry - reduces component count and board area. |
| Automotive Camera Module Power | Telematics Control Unit (TCU) Subsystem |
Use Scenario: Providing clean, low-noise 3.3V and 1.8V supplies to image sensor and ISP in rear-view camera module. IC Role / Device Role / Timing Role: Operated in out-of-phase mode to minimize input ripple on shared 12V supply line feeding multiple camera modules. Use Value: Reduces required input bulk capacitance by 40% versus in-phase configuration - saves space and cost in compact camera PCBs. | Use Scenario: Generating isolated 5V and 3.3V rails for LTE modem, GNSS receiver, and CAN transceiver in TCU. IC Role / Device Role / Timing Role: Uses independent EN1/EN2 control to stagger power-up of modem (after GNSS lock) and CAN interface (after firmware init). Use Value: Prevents brown-out during simultaneous high-current draw events - improves boot reliability and network handshake success rate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4423HGQ-A-Z | Single-channel 3A buck; no integrated tracking or sync-out; 2.5V–36V input; 1.2MHz fixed fSW | Lacks dual-channel integration and output sequencing - requires two devices for same functionality. | Choose when only one regulated rail is needed and higher switching frequency is acceptable. |
| TPS543B20RHLT | Single-channel 15A buck with PMBus interface; 4.5V–18V input; supports AVS and margining | No dual-output capability; requires external sequencing IC for multi-rail systems; not automotive-qualified. | Prefer for high-current single-rail applications needing digital telemetry, not dual-rail automotive use. |
Compared with MPQ4423HGQ-A-Z and TPS543B20RHLT, the ISL78208ARZ-T7A uniquely integrates dual 3A channels, automotive temperature rating, wettable flank packaging, and hardware-based output tracking - reducing bill-of-materials and design validation effort for infotainment and ADAS subsystems.
Availability
ISL78208ARZ-T7A 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-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 design.
The ISL78208ARZ-T7A belongs to Renesas' ISL78xxx automotive power management family, engineered specifically for demanding under-hood and infotainment applications requiring high reliability, wide input range, and integrated dual-output regulation.
FAQ
What is the maximum continuous output current per channel for the ISL78208ARZ-T7A?
The ISL78208ARZ-T7A delivers 3A continuous output current per channel under recommended operating conditions (TA ≤ +105°C, proper PCB thermal design, and adequate input/output capacitance). This is validated across the full −40°C to +105°C automotive temperature range with derating applied above +85°C ambient per thermal performance curves in the datasheet.
Does the ISL78208ARZ-T7A require external MOSFETs or diodes?
Yes, the ISL78208ARZ-T7A integrates internal N-Channel power MOSFETs but requires external Schottky diodes (e.g., B340B) connected from PHASEx to GND to complete the buck topology. No external high-side or low-side MOSFETs are needed - the internal switches handle up to 3A per channel.
Can the ISL78208ARZ-T7A operate in current-sharing mode for higher output current?
Yes, the ISL78208ARZ-T7A supports parallel operation of both channels to deliver up to 6A from a single output (e.g., 5V@6A), as shown in Figure 3 of the datasheet. This requires matching inductors, synchronized switching (via SYNCIN), and careful PCB layout to balance current within ±5% between phases.
What is the purpose of the wettable flank feature in the ISL78208ARZ-T7A package?
The wettable flank design exposes vertical metal sidewalls on all perimeter leads of the WFQFN package, enabling automated optical inspection (AOI) of solder joint quality during SMT assembly. This is critical for zero-defect automotive manufacturing and improves field reliability by detecting insufficient solder fillets or voids that could cause intermittent opens.
How does the ISL78208ARZ-T7A handle overcurrent conditions?
The ISL78208ARZ-T7A employs cycle-by-cycle peak current limiting with a typical threshold of 5.1A per channel. Upon overcurrent detection, it enters hiccup-mode protection: disabling switching for ~10ms, then attempting restart. This prevents thermal damage while allowing automatic recovery once the fault clears - unlike latch-off schemes requiring external reset.
ISL78208ARZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-VFQFN 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):
- 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
- Supplier Device Package:
- 32-QFN (5x5)
ISL78208ARZ-T7A FAQ
1.How can I place an order for ISL78208ARZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78208ARZ-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 ISL78208ARZ-T7A reliable?
The price and inventory of ISL78208ARZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78208ARZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL78208ARZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78208ARZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78208ARZ-T7A?
ISL78208ARZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78208ARZ-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 ISL78208ARZ-T7A?
For technical support, including ISL78208ARZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78208ARZ-T7A requirements.
6.How does Aetrix verify that ISL78208ARZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL78208ARZ-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 ISL78208ARZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL78208ARZ-T7A?
All ISL78208ARZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL78208ARZ-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 ISL78208ARZ-T7A part is unused and in its original packaging.
Return procedure for ISL78208ARZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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