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Renesas ISL78205AVEZ
- Part No.:
- ISL78205AVEZ
- Manufacturer:
- Renesas
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
ISL78205AVEZ.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,403
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Product details
Overview
ISL78205AVEZ from Renesas (formerly Intersil) is a synchronous buck controller with integrated 90mΩ high-side N-channel MOSFET and low-side gate driver, supporting 3V–40V input, 0.8V–(VIN×DMAX−VDROP) output, and up to 2.5A continuous load at +85°C ambient in 5V/500kHz/8–30VIN conditions. It delivers ±1% output voltage regulation accuracy and operates in automotive power systems requiring AEC-Q100 qualification.
For engineers reviewing the ISL78205AVEZ datasheet, ISL78205AVEZ pinout, ISL78205AVEZ application, or ISL78205AVEZ equivalent, key selection considerations include its integrated high-side MOSFET, programmable 200kHz–2.2MHz switching frequency, cycle-by-cycle overcurrent protection with hiccup mode, thermal shutdown at +155°C, and compatibility with both synchronous and non-synchronous buck topologies.
Technical Context
The ISL78205AVEZ implements peak current mode control with slope compensation for stable loop response and fast transient immunity. Its dual-mode operation supports synchronous buck (with external low-side MOSFET driven via LGATE) and non-synchronous buck (with diode and LGATE disabled), enabling flexible layout and efficiency trade-offs.
Protection architecture includes three-tier fault handling: cycle-by-cycle current limiting (IOC1 = 3.6A default), hiccup-mode secondary limit (IOC2 = 115% of IOC1), and frequency foldback during overload - all coordinated with soft-start reset logic and 1000-cycle PGOOD delay. Overvoltage protection triggers at 110% (non-latching) or 120% (latching) of 0.8V reference, while thermal shutdown activates at +155°C with +140°C recovery hysteresis.
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) without external clamping. |
| Output Current Capability | 2.5A continuous - validated at +85°C ambient, 5VOUT, 500kHz, 8–30VIN, still air; derating required above +85°C or higher VIN/VOUT ratios. |
| Switching Frequency | 200kHz to 2.2MHz programmable - set via resistor on FS pin; default 500kHz when FS tied to VCC/GND/floating; enables EMI optimization and small magnetics. |
| Voltage Regulation Accuracy | ±1% - tight tolerance over −40°C to +105°C ensures stable I/O and core supply rails for embedded processors. |
| Integrated High-Side rDS(ON) | 90mΩ typical - reduces conduction loss and eliminates external high-side FET, simplifying BOM and layout for compact 24V bus regulators. |
| Current Limit Threshold | 3.6A default (IOC1) - programmable via ILIMIT pin resistor; second threshold at 4.14A (IOC2) triggers hiccup mode for short-circuit robustness. |
| Thermal Protection | +155°C shutdown / +140°C recovery - prevents permanent damage under sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
ISL78205AVEZ is housed in a thermally enhanced 20-lead HTSSOP package (M20.173A) with exposed thermal pad (PAD, Pin 21) that must be soldered to PCB ground plane using ≥20 vias for optimal θJA = 32°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1) | Power ground return | Low-impedance path for high-current switch node return; must connect directly to power ground plane, separate from SGND/DGND. |
| BOOT (2) | High-side gate driver bias | Supplies floating voltage to drive internal N-MOSFET gate; requires 1µF ceramic capacitor between BOOT and PHASE for bootstrap operation. |
| VIN (3,4) | Main input supply | Connects to input rail and drain of integrated high-side MOSFET; also powers internal LDO (VCC); rated 3–40V with 44V absolute max. |
| SGND (5) | Analog signal ground | Reference for FB, COMP, EN, SS, ILIMIT; must tie to quiet analog ground plane, isolated from PGND except at single-point star ground. |
| VCC (6) | Internal LDO output | Provides 4.5V ±0.3V bias for control circuitry; requires ≥4.7µF ceramic decoupling to PGND/SGND. |
| EN (8) | Enable control | Active-high logic input; IC enabled when >2V, disabled when <0.8V; internal pull-up allows floating for always-on operation. |
| FS (9) | Frequency select | Resistor-to-GND sets oscillator frequency (200kHz–2.2MHz); open/VCC/GND defaults to 500kHz. |
| SS (10) | Soft-start timing | External capacitor charged by 5µA current source sets ramp time; also used for tracking and hiccup-mode reset. |
| FB (11) | Feedback input | Inverting input of error amplifier; senses output via resistor divider to regulate VOUT = 0.8V × (1 + R1/R2). |
| COMP (12) | Error amplifier output | Compensation node for voltage loop; connects RC network to FB for stability across load/input variations. |
| ILIMIT (13) | Overcurrent threshold | Resistor-to-GND programs IOC1; open/VCC/GND yields 3.6A default; 71.5kΩ yields 4.18A max. |
| DGND (14) | Digital ground | Ground reference for PGOOD, SYNC, LGATE; should connect to SGND at quiet ground plane, not PGND. |
| PGOOD (15) | Power-good indicator | Open-drain output with 1000-cycle delay; pulls low on OV/UV or EN deactivation; requires external pull-up to VCC. |
| PHASE (16,17) | Switch node | Connects to inductor and source of internal high-side MOSFET; carries high dv/dt switching waveform; requires tight layout. |
| SYNC (19) | Frequency synchronization | Bidirectional pin: outputs local clock or accepts external sync signal (10% higher freq); enables multi-phase interleaving with 180° phase shift. |
| LGATE (20) | Low-side gate driver | Drives external N-MOSFET in synchronous mode; must be pulled to GND via ≤5.1kΩ to prevent noise turn-on; tied to VCC via ≤5kΩ to disable in diode mode. |
| NC (7,18) | No connection | Not internally bonded; connect to SGND for mechanical stability and EMI reduction. |
| PAD (21) | Thermal pad | Exposed copper pad on package underside; electrically isolated but critical for heat dissipation; must be soldered to large ground copper area. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive applications (-40°C to +105°C ambient), meeting stress test requirements for reliability in harsh environments. |
| Integrated 90mΩ high-side MOSFET | Eliminates external high-side FET, reducing component count, board space, and gate-drive complexity in 24V bus and battery-powered systems. |
| Programmable frequency & sync capability | Enables EMI spread-spectrum design and multi-phase interleaving across multiple ISL78205AVEZ units without external clock generators. |
| Hiccup-mode overcurrent protection | Disables PWM for 5× soft-start duration upon severe overload, preventing thermal runaway while allowing automatic recovery when fault clears. |
| Pre-biased output startup | Supports hot-swap and rail sequencing in multi-rail systems where output capacitor is pre-charged before IC enable. |
| Ultra-low shutdown current | 1.8–3µA shutdown supply current enables long-term battery backup operation in always-on automotive modules. |
Applications
| Automotive Infotainment Power Supply | Industrial 24V Bus Regulator |
|---|---|
|
Use Scenario: Powers display controllers, audio codecs, and USB hubs in head units with wide input variation (6–36V) and strict thermal constraints. IC Role / Device Role / Timing Role: Synchronous buck controller managing 5V/3.3V rails with integrated high-side FET and hiccup-mode short-circuit protection. Use Value: Eliminates need for external high-side MOSFET and discrete current sense, reducing BOM cost and PCB area while maintaining AEC-Q100 compliance. |
Use Scenario: Converts unregulated 24V factory bus to stable 5V for PLC I/O modules operating in high-temperature cabinets. IC Role / Device Role / Timing Role: Primary DC-DC controller delivering 2.5A with programmable 500kHz switching and thermal shutdown at +155°C. Use Value: Delivers consistent output under 24V line transients and ambient temperatures up to +85°C, with minimal derating due to θJA = 32°C/W package. |
| Embedded Processor Core Supply | Battery-Powered Telematics Module |
|
Use Scenario: Generates 1.2V/1.8V core voltage for ARM-based telematics SoCs from 12V vehicle battery with tight regulation and fast load transient response. IC Role / Device Role / Timing Role: Peak current mode buck controller with ±1% regulation accuracy and soft-start-controlled ramp-up to prevent inrush. Use Value: Achieves <1% load/line regulation per Figures 5–6, ensuring stable processor operation during CAN bus activity and RF transmission bursts. |
Use Scenario: Powers GPS/GSM modules in asset trackers powered by Li-ion (3.0–4.2V) or lead-acid (11–14V) batteries with low quiescent current demand. IC Role / Device Role / Timing Role: Wide-input buck controller operating down to 3.05V start-up voltage and drawing only 1.8µA in shutdown. Use Value: Enables >1-year battery life in sleep mode while supporting full-power operation during data upload windows without brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL78206AVEZ | Successor part with identical pinout, same 90mΩ high-side MOSFET, but improved thermal performance (θJA = 28°C/W) and extended 2.5A rating at +105°C ambient. | Preferred for new designs targeting higher ambient temperature operation or tighter thermal margins; supports same schematic with no layout change. | Select ISL78206AVEZ for new designs requiring extended temperature margin or improved efficiency at full load; ISL78205AVEZ remains viable for legacy replacements and cost-sensitive builds. |
| MPQ4312-AEC1 | Monolithic 3A buck converter (not controller) with integrated high/low-side MOSFETs; 3.8–36V input; fixed 500kHz; no FS/SYNC/ILIMIT pins. | Suitable for simpler, lower-cost 5V/3.3V supplies where programmability and multi-phase sync are unnecessary. | Choose MPQ4312-AEC1 when design prioritizes integration over flexibility - e.g., auxiliary rails where 3A headroom and fixed frequency suffice. |
Compared with ISL78205AVEZ, ISL78206AVEZ offers superior thermal performance for high-ambient deployments, while MPQ4312-AEC1 trades programmability for monolithic simplicity and higher current rating - making each suitable for distinct tiers of automotive power system complexity.
Availability
ISL78205AVEZ is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial 24V bus regulators, and battery-powered telematics modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL78205AVEZ 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 technical and manufacturing continuity for the ISL78xxx automotive power portfolio.
The ISL78205AVEZ belongs to Renesas' AEC-Q100-qualified buck controller family designed specifically for demanding automotive power conversion tasks including engine control units, ADAS domain controllers, and body electronics.
FAQ
What is the maximum continuous output current supported by the ISL78205AVEZ?
The ISL78205AVEZ supports 2.5A continuous output current under defined thermal conditions: +85°C ambient temperature, 5V output, 500kHz switching frequency, and input voltage between 8V and 30V with still air cooling. Actual current capability decreases with higher ambient temperature, elevated input voltage, or reduced airflow - always verify die temperature remains below +125°C using thermal imaging or calculation based on θJA = 32°C/W and measured power loss. The ISL78205AVEZ datasheet specifies this rating on page 13 under "Output Current".
Does the ISL78205AVEZ support both synchronous and non-synchronous buck topologies?
Yes, the ISL78205AVEZ supports both configurations. In synchronous mode, LGATE drives an external low-side N-MOSFET; in non-synchronous mode, LGATE is disabled by connecting it to VCC before startup and a Schottky diode replaces the low-side FET. The ISL78205AVEZ block diagram (page 4) and Typical Application Schematics I & II (page 5) explicitly show both implementations. Non-synchronous operation requires a snubber at the PHASE node to suppress ringing that may falsely trigger PGOOD.
How is overcurrent protection implemented in the ISL78205AVEZ?
The ISL78205AVEZ implements dual-level overcurrent protection: first, cycle-by-cycle current limiting (IOC1 = 3.6A default) shuts off the high-side MOSFET each cycle when current exceeds threshold; second, hiccup mode (IOC2 = 4.14A) disables PWM for five soft-start durations upon reaching the higher threshold. Frequency foldback reduces switching frequency during overload to maintain current limit. These functions are detailed in the "Fault Protection" section (pages 13–14) of the ISL78205AVEZ datasheet.
Can the ISL78205AVEZ start up with a pre-biased output?
Yes, the ISL78205AVEZ supports pre-biased output startup, allowing the output capacitor to retain voltage before enable. This feature is essential for hot-swap and rail-sequencing applications. During pre-biased start, the controller avoids reverse inductor current by monitoring the PHASE node and delaying high-side turn-on until the output voltage begins rising. The ISL78205AVEZ functional description on page 12 confirms this capability and shows waveforms in Figure 9.
What package type and thermal considerations apply to the ISL78205AVEZ?
The ISL78205AVEZ uses a 20-lead HTSSOP package (M20.173A) with an exposed thermal pad (Pin 21). For reliable thermal performance, the pad must be soldered to a large PCB ground plane using ≥20 thermal vias. This achieves θJA = 32°C/W in still air; inadequate grounding raises junction temperature and risks thermal shutdown. Layout guidelines on page 13 emphasize via count, copper area, and separation from noisy PGND traces. The ISL78205AVEZ thermal resistance table (page 6) and Figures 7–8 provide derating curves.
ISL78205AVEZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ISL78205AVEZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78205AVEZ 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 reliable?
The price and inventory of ISL78205AVEZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78205AVEZ is usually 5 days.
3.What payment methods are accepted for ISL78205AVEZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78205AVEZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78205AVEZ?
ISL78205AVEZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78205AVEZ 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?
For technical support, including ISL78205AVEZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78205AVEZ requirements.
6.How does Aetrix verify that ISL78205AVEZ is sourced from the original manufacturer or authorized distributors?
All ISL78205AVEZ 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 meets industry standards.
7.What is the process for return or replacement of ISL78205AVEZ?
All ISL78205AVEZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL78205AVEZ, 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 part is unused and in its original packaging.
Return procedure for ISL78205AVEZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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