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Renesas ISL78205AVEZ-T
- Part No.:
- ISL78205AVEZ-T
- Manufacturer:
- Renesas
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
ISL78205AVEZ-T.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,432
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Product details
Overview
ISL78205AVEZ-T from Renesas (formerly Intersil) is a synchronous buck controller with integrated 90mΩ high-side N-channel MOSFET, supporting 3V–40V input and delivering up to 2.5A continuous output at 5V under 8V–30VIN, 500kHz, +85°C ambient, still air. It implements peak current mode control, programmable 200kHz–2.2MHz switching, ±1% output voltage regulation, and AEC-Q100 qualification for automotive power rails.
For engineers reviewing the ISL78205AVEZ-T datasheet, ISL78205AVEZ-T pinout, ISL78205AVEZ-T application, or ISL78205AVEZ-T equivalent, key selection considerations include its integrated high-side MOSFET, hiccup-mode overcurrent protection, thermal derating behavior at elevated ambient, and compatibility with both synchronous and non-synchronous buck topologies in harsh-environment DC/DC conversion.
Technical Context
The ISL78205AVEZ-T employs peak current mode PWM control with slope compensation for fast transient response and inherent cycle-by-cycle current limiting. Its oscillator supports internal 500kHz default operation or resistor-programmed frequency (200kHz–2.2MHz), plus external synchronization via bi-directional SYNC pin with automatic 180° phase shift between master/slave ICs.
Fault management includes dual-threshold overcurrent protection (IOC1 = 3.6A default, IOC2 = 115% of IOC1), frequency foldback during overload, latching/non-latching overvoltage protection (110%/120% VREF), and thermal shutdown at +155°C with +140°C recovery hysteresis - all implemented without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports wide automotive battery transients including cold-crank (≥3V) and load-dump (≤40V) |
| Output Current Capability | 2.5A continuous - verified at 5VOUT, 8–30VIN, 500kHz, +85°C ambient, still air; limited by thermal design and die temperature ≤+125°C |
| Switching Frequency | 200kHz to 2.2MHz - programmable via FS pin resistor; default 500kHz when FS tied to VCC/GND/floating |
| Voltage Regulation Accuracy | ±1% - tight tolerance referenced to internal 0.8V bandgap, enabling stable 5V/3.3V/1.8V processor I/O supplies |
| High-Side MOSFET rDS(ON) | 90mΩ typical - integrated N-channel switch reduces BOM count and layout complexity vs. external controller solutions |
| Operating Temperature Range | −40°C to +105°C - qualified per AEC-Q100 Grade 2, suitable for under-hood and cabin electronics |
| Shutdown Current | <3µA - ultra-low quiescent draw enables always-on systems without excessive battery drain |
Pinout & Package
ISL78205AVEZ-T is housed in a thermally enhanced 20-lead HTSSOP package (M20.173A) with exposed thermal pad (PAD, Pin 21) requiring connection to PCB ground plane via ≥20 vias for optimal thermal performance. Pin functions are validated per FN7926 Rev 3.00 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1) | Power Ground | Return path for high-current power flow and driver circuitry; must be low-inductance connection to thermal pad |
| BOOT (2) | Bootstrap Supply | Bias voltage source for high-side gate driver; requires 1µF ceramic capacitor to PHASE |
| VIN (3,4) | Main Input Supply | Connects to input rail and drain of integrated high-side MOSFET; also powers internal LDO |
| SGND (5) | Analog/Sense Ground | Reference return for feedback, error amplifier, and monitoring circuits; separate from PGND |
| VCC (6) | LDO Output | 4.5V ±0.3V regulated supply for internal logic and drivers; requires ≥4.7µF decoupling to SGND |
| EN (8) | Enable Control | Active-high enable; IC disabled when pulled below 0.8V, enabled above 2V or floating |
| FS (9) | Frequency Set | Resistor-to-GND sets switching frequency; open/VCC/GND configures 500kHz default |
| SS (10) | Soft-Start Timing | External capacitor charged by 5µA current source sets ramp time; also triggers hiccup mode on fault |
| FB (11) | Voltage Feedback | Inverting input of error amplifier; senses output via resistor divider to set VOUT ≥0.8V |
| COMP (12) | Error Amplifier Output | Compensation node for loop stability; connects RC network between COMP and FB |
| ILIMIT (13) | Current Limit Programming | Resistor-to-GND sets peak current threshold from 3.6A default up to 4.18A (TYP) |
| DGND (14) | Digital Ground | Ground reference for digital logic; connect to SGND at quiet ground plane |
| PGOOD (15) | Power Good Monitor | Open-drain status flag with 1000-cycle delay; asserts low on OV/UV or EN deactivation |
| PHASE (16,17) | Switch Node | Connects to inductor; tied to source of high-side MOSFET and drain of external low-side FET/diode |
| SYNC (19) | Sync Clock I/O | Bi-directional pin for multi-phase synchronization or external clock injection (10% higher freq) |
| LGATE (20) | Low-Side Gate Driver | Drives external N-MOSFET in synchronous mode; disable by connecting to VCC before startup in diode mode |
| NC (7,18) | No Connect | Internally unconnected; tie to SGND for mechanical stability and EMI reduction |
| PAD (21) | Thermal Pad | Non-electrical thermal interface; must be soldered to large PCB ground copper area with ≥20 vias |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 90mΩ High-Side MOSFET | Eliminates external high-side switch, reducing component count, layout area, and gate-drive complexity |
| Hiccup-Mode Overcurrent Protection | Enters 5× extended soft-start cycle upon second OC threshold breach, preventing thermal runaway during sustained shorts |
| Programmable Switching Frequency | 200kHz–2.2MHz range allows optimization of efficiency vs. size trade-offs across 5V/3.3V/1.8V output rails |
| AEC-Q100 Qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power supplies |
| Synchronous & Non-Synchronous Operation | Configurable LGATE driver supports either external low-side FET (efficiency) or Schottky diode (cost/simplicity) |
Applications
| Automotive Engine Control Unit (ECU) Power | Industrial 24V Bus Regulator |
|---|---|
Use Scenario: Stable 5V supply for microcontroller, CAN transceiver, and sensor interfaces in under-hood ECU modules exposed to −40°C to +105°C ambient and load-dump transients. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with integrated high-side switch and robust fault protection. Use Value: AEC-Q100 qualification, 40V max input, and hiccup-mode OC protection ensure reliable operation during cranking and load-dump events. | Use Scenario: Compact, high-reliability 3.3V/1.8V point-of-load converter for PLC I/O modules powered from industrial 24V DC bus. IC Role / Device Role / Timing Role: Fixed-frequency buck controller with ±1% regulation accuracy and programmable current limit. Use Value: 200kHz–2.2MHz frequency tuning enables optimal inductor sizing; thermal pad ensures stable operation in enclosed enclosures. |
| Embedded Processor Core Supply | Battery-Powered Telematics Module |
Use Scenario: Efficient 1.2V core supply for ARM Cortex-A series processors in automotive infotainment head units. IC Role / Device Role / Timing Role: Synchronous buck controller with external low-side MOSFET driven by LGATE pin. Use Value: Integrated high-side switch and low RDS(ON) minimize conduction loss; soft-start prevents inrush into large core capacitance. | Use Scenario: Low-quiescent 5V regulator for GPS/GSM modules operating from 9–16V lead-acid or Li-ion battery packs. IC Role / Device Role / Timing Role: Wide-input buck controller with <3µA shutdown current and pre-biased start-up capability. Use Value: Ultra-low shutdown current extends battery life; ability to start into pre-biased output avoids brown-out during battery switchover. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL78206AVEZ-T | Successor device with improved thermal performance, lower RDS(ON) (75mΩ), and extended 3V–42V input range | Same pinout and footprint; supports higher output current (3A typical) and wider VIN range | Preferred for new designs requiring higher efficiency or extended input range; drop-in replacement per manufacturer recommendation |
| MPQ4312-AEC1 | Monolithic 3A buck converter (not controller); integrates both high- and low-side MOSFETs; 3.8V–36V input | Requires no external low-side FET or diode; fixed 500kHz frequency; no SYNC or ILIMIT pins | Best for space-constrained designs where full integration is prioritized over frequency flexibility or programmable OC limit |
Compared with ISL78205AVEZ-T, ISL78206AVEZ-T offers higher current capability and wider input range in identical packaging, while MPQ4312-AEC1 trades configurability for monolithic simplicity and smaller solution size - making each suitable for distinct design priorities: upgrade path, integration density, or legacy compatibility.
Availability
ISL78205AVEZ-T is available at Aetrix Electronics and suitable for automotive ECU power, industrial 24V bus regulation, and embedded processor I/O supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for ISL78205AVEZ-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 Corporation acquired Intersil in 2017 and maintains full support for the ISL78205 product line. Renesas is a global semiconductor leader focused on embedded solutions for automotive, industrial, and IoT markets.
The ISL78205 belongs to Renesas' automotive-grade power management portfolio, designed specifically for robust, high-reliability DC/DC conversion in safety-critical vehicle subsystems including engine control, ADAS, and body electronics.
FAQ
What is the maximum continuous output current supported by the ISL78205AVEZ-T?
The ISL78205AVEZ-T supports up to 2.5A continuous output current under defined thermal conditions: 5VOUT, 8–30VIN, 500kHz switching, +85°C ambient, still air. Actual current depends on board layout, airflow, and die temperature - which must remain ≤+125°C. The internal 90mΩ high-side MOSFET and thermal pad design enable this rating without external heatsinking.
Does the ISL78205AVEZ-T support pre-biased output start-up?
Yes, the ISL78205AVEZ-T supports pre-biased output start-up, as confirmed in Figure 9 and Functional Description section of FN7926 Rev 3.00. This allows safe turn-on when the output capacitor is already charged, preventing reverse current flow and potential damage to downstream circuitry - critical for battery-backed or hot-swap applications.
How is overcurrent protection implemented in the ISL78205AVEZ-T?
The ISL78205AVEZ-T implements dual-threshold overcurrent protection: IOC1 (3.6A default) enables cycle-by-cycle limiting, while IOC2 (115% of IOC1) triggers hiccup mode with 5× extended soft-start duration. Frequency foldback also reduces switching frequency under overload to maintain current limit - all without external components.
Can the ISL78205AVEZ-T operate in non-synchronous buck mode?
Yes, the ISL78205AVEZ-T supports non-synchronous operation. In this mode, the LGATE pin must be connected to VCC (via ≤5kΩ resistor) before startup to disable the low-side driver. A Schottky diode replaces the external MOSFET, simplifying design at the cost of reduced efficiency compared to synchronous mode.
What is the purpose of the thermal pad (PAD, Pin 21) on the ISL78205AVEZ-T?
The thermal pad (PAD, Pin 21) on the ISL78205AVEZ-T is a non-electrical, exposed copper pad on the underside of the HTSSOP package. It must be soldered to a large PCB ground copper area using ≥20 thermal vias to minimize θJA (32°C/W typical) and prevent die temperature from exceeding +125°C under load - essential for automotive and industrial reliability.
ISL78205AVEZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 38V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Both
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
ISL78205AVEZ-T FAQ
1.How can I place an order for ISL78205AVEZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78205AVEZ-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 ISL78205AVEZ-T reliable?
The price and inventory of ISL78205AVEZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78205AVEZ-T is usually 5 days.
3.What payment methods are accepted for ISL78205AVEZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78205AVEZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78205AVEZ-T?
ISL78205AVEZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78205AVEZ-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 ISL78205AVEZ-T?
For technical support, including ISL78205AVEZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78205AVEZ-T requirements.
6.How does Aetrix verify that ISL78205AVEZ-T is sourced from the original manufacturer or authorized distributors?
All ISL78205AVEZ-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 ISL78205AVEZ-T meets industry standards.
7.What is the process for return or replacement of ISL78205AVEZ-T?
All ISL78205AVEZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL78205AVEZ-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 ISL78205AVEZ-T part is unused and in its original packaging.
Return procedure for ISL78205AVEZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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