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Renesas ISL78233ARZ-T
- Part No.:
- ISL78233ARZ-T
- Manufacturer:
- Renesas
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ISL78233ARZ-T.pdf
- Description:
- IC REG BUCK ADJ 3A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,014
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Product details
Overview
ISL78233ARZ-T from Renesas Electronics is a monolithic synchronous buck regulator delivering up to 3A continuous output current from a 2.7V–5.5V input, featuring integrated 35mΩ P-channel and 11mΩ N-channel MOSFETs, adjustable 500kHz–4MHz switching frequency (default 2MHz), and AEC-Q100 qualification for automotive power rails.
For engineers reviewing the ISL78233ARZ-T datasheet, ISL78233ARZ-T pinout, ISL78233ARZ-T application, or ISL78233ARZ-T equivalent, this device supports precise DC/DC POL regulation in space-constrained, thermally demanding environments with fast transient response, hiccup-mode overcurrent protection, and soft-stop output discharge during shutdown.
Technical Context
The ISL78233ARZ-T uses peak-current-mode PWM control with slope compensation (440mV/Ts) and internal transconductance error amplifier (125µA/V) for stable loop dynamics across load and line variations. Its dual-mode operation-configurable PWM (forced continuous) or PFM (discontinuous)-enables noise-sensitive or efficiency-critical design trade-offs.
It integrates fault protection including hiccup-mode overcurrent limiting (3.7A–6.6A trip range), thermal shutdown at +150°C with 25°C hysteresis, overvoltage protection (OVP PG rising threshold at 0.80V), and negative current detection (−0.6A to −6.0A). The 1ms power-good delay and internal/external soft-start (1ms fixed or capacitor-adjustable) ensure controlled system sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports microcontroller, FPGA, and SoC core rails without external current boosting. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion, automotive 3.3V/5V domains, and post-regulated supplies. |
| Switching Frequency | 500kHz–4MHz (default 2MHz) - enables compact magnetics and EMI optimization via external resistor on FS pin. |
| FET ON-Resistance | P-ch 35mΩ / N-ch 11mΩ (typ @ 5V VIN) - minimizes conduction loss and improves full-load efficiency up to 95%. |
| Reference Accuracy | ±1% over temperature/load/line - ensures tight output regulation (e.g., ±12mV at 1.2V) for sensitive digital loads. |
| Operating Temp Range | −40°C to +125°C junction - qualified per AEC-Q100 Grade 1 for under-hood and infotainment applications. |
| Quiescent Current | 45µA (no load, PFM mode) - extends battery runtime in always-on systems such as telematics modules. |
Pinout & Package
ISL78233ARZ-T is housed in a 3mm × 3mm, 16-lead Thin Quad Flat No-Lead (TQFN) package with exposed thermal pad connected to SGND. Pin count and layout match ISL78234ARZ-T for scalable power upgrades.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,16) | Input supply rail | Accepts 2.7V–5.5V; requires ≥2×22µF ceramic decoupling directly to PGND for stability and EMI suppression. |
| PHASE (Pins 13–15) | Switching node | Connects to inductor high-side terminal; internally discharged via 100Ω resistor during shutdown to prevent shoot-through. |
| FB (Pin 9) | Feedback input | Senses output voltage via resistor divider; references internal 0.600V bandgap for adjustable VOUT (1.2V–VIN−losses). |
| EN (Pin 5) | Enable control | Active-high logic input (VIH = 0.9V); asserts soft-stop discharge of output capacitor when pulled low. |
| PG (Pin 3) | Power-good indicator | Open-drain output with 1ms delay after regulation; requires external pull-up to VIN for system sequencing confirmation. |
| COMP (Pin 8) | Error amplifier output | Supports internal compensation (tie to VDD) or external network for loop tuning flexibility and robustness across PCB parasitics. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables <200mV dropout at 3A, supporting ultra-low-VIN scenarios like cold-crank automotive conditions. |
| Soft-stop output discharge | Internally discharges VOUT capacitor during disable-eliminates need for external bleed circuit in safety-critical systems. |
| Adjustable frequency & sync capability | FS pin sets 500kHz–4MHz; SYNC pin accepts external clock up to 4MHz for EMI reduction via spread-spectrum alignment. |
| Hiccup-mode overcurrent protection | Auto-restarts after fault clearance-prevents thermal runaway during sustained short-circuit without latch-up. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use including temperature cycling, vibration, and ESD (5kV HBM) - reduces qualification overhead. |
Applications
| Automotive Infotainment Power | Microcontroller Core Rail |
|---|---|
Use Scenario: Powering SoC-based head units with dynamic load profiles (e.g., video decode bursts). IC Role / Device Role / Timing Role: Primary 1.2V/1.5V/1.8V POL regulator with fast transient response and hiccup-mode fault containment. Use Value: Maintains regulation within ±1% during 0–3A step loads (tr/tf < 1µs), preventing SoC reset or data corruption. |
Use Scenario: Supplying ARM Cortex-M7 or RISC-V MCU cores requiring clean, sequenced 3.3V or 1.8V rails. IC Role / Device Role / Timing Role: High-efficiency buck converter with programmable soft-start and PG signal for boot coordination. Use Value: 1ms PG delay and internal 1ms soft-start ensure deterministic power-up timing aligned with MCU reset assertion. |
| FPGA I/O Bank Regulation | Li-ion Battery-Powered Devices |
Use Scenario: Delivering configurable 1.2V–3.3V to FPGA I/O banks with varying VCCIO requirements. IC Role / Device Role / Timing Role: Adjustable-output synchronous buck with external feedback divider and precision reference (±1%). Use Value: Reference accuracy and low line regulation (0.2%/V) maintain I/O voltage integrity across battery discharge (3.0V–4.2V VIN). |
Use Scenario: Power management in portable medical monitors or handheld test equipment with single-cell Li-ion input. IC Role / Device Role / Timing Role: Low-quiescent (45µA), PFM-capable buck regulator enabling >100-hour standby time. Use Value: Discontinuous mode reduces light-load switching losses, extending runtime by >35% vs. forced-PWM alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL78234ARZ-T | 4A output rating, identical pinout and feature set; higher peak current limit (5.2A–9A vs. 3.7A–6.6A). | Required where system load exceeds 3A but board layout must remain unchanged. | Select ISL78234ARZ-T only if future-proofing for higher current or margin expansion is needed-same footprint, no redesign. |
| TPS543320RHLR | 3A, 4.5V–18V input, 2.2MHz default freq; includes PMBus interface and telemetry, larger 4mm×4mm QFN. | Used in industrial servers or telecom where digital monitoring and wider VIN range are mandatory. | Choose TPS543320RHLR only when telemetry, extended input range, or digital control outweigh cost and size penalties. |
Compared with ISL78234ARZ-T, ISL78233ARZ-T offers lower cost and optimized thermal performance for ≤3A loads; versus TPS543320RHLR, it provides simpler analog control, smaller footprint, and AEC-Q100 compliance without telemetry overhead.
Availability
ISL78233ARZ-T is available at Aetrix Electronics and suitable for automotive infotainment power, microcontroller core rails, and Li-ion battery-powered devices requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for ISL78233ARZ-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 specializing in microcontrollers, analog power management, and automotive SoCs, with deep expertise in high-reliability automotive-grade ICs.
The ISL78233ARZ-T belongs to Renesas' ISL7823x automotive buck regulator family, designed specifically for ASIL-B-compatible power rails in infotainment, ADAS, and body electronics where efficiency, thermal robustness, and functional safety are critical.
FAQ
What is the maximum continuous output current supported by the ISL78233ARZ-T?
The ISL78233ARZ-T delivers up to 3A of continuous output current across its full operating temperature range (−40°C to +125°C). This rating is validated under worst-case thermal conditions using the 3mm×3mm TQFN package with proper PCB copper area and thermal vias. Peak current capability reaches 6.6A before hiccup-mode overcurrent protection activates.
Does the ISL78233ARZ-T support adjustable output voltage?
Yes, the ISL78233ARZ-T supports fully adjustable output voltage from approximately 0.6V up to just below the input voltage (VIN minus conduction losses), using an external resistor divider connected to the FB pin. The internal reference is tightly regulated at 0.600V ±1%, enabling precise setting of common rails like 1.2V, 1.8V, or 3.3V.
How does the soft-start function operate on the ISL78233ARZ-T?
The ISL78233ARZ-T provides two soft-start options: internal 1ms ramp (SS pin tied to SGND) or externally adjustable via capacitor from SS to SGND (up to 33nF). During startup, the COMP voltage ramps linearly, controlling the duty cycle to limit inrush current and prevent output overshoot-critical for protecting downstream FPGAs and SoCs.
Can the ISL78233ARZ-T be synchronized to an external clock?
Yes, the ISL78233ARZ-T supports external synchronization via the SYNC pin, accepting positive-edge-triggered clock signals up to 4MHz. When SYNC is driven externally, the internal oscillator locks to the input frequency-enabling EMI reduction through frequency alignment and eliminating beat frequencies in multi-rail systems.
What protection features are integrated into the ISL78233ARZ-T?
The ISL78233ARZ-T integrates comprehensive protection: hiccup-mode overcurrent (3.7A–6.6A trip), overvoltage (0.80V PG threshold), overtemperature shutdown (+150°C with 25°C hysteresis), negative current limiting (−0.6A to −6.0A), and undervoltage lockout (2.5V rising threshold). All protections are fully autonomous and require no external components.
ISL78233ARZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3A
- Frequency - Switching:
- 420kHz ~ 4.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (3x3)
ISL78233ARZ-T FAQ
1.How can I place an order for ISL78233ARZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78233ARZ-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 ISL78233ARZ-T reliable?
The price and inventory of ISL78233ARZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78233ARZ-T is usually 5 days.
3.What payment methods are accepted for ISL78233ARZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78233ARZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78233ARZ-T?
ISL78233ARZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78233ARZ-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 ISL78233ARZ-T?
For technical support, including ISL78233ARZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78233ARZ-T requirements.
6.How does Aetrix verify that ISL78233ARZ-T is sourced from the original manufacturer or authorized distributors?
All ISL78233ARZ-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 ISL78233ARZ-T meets industry standards.
7.What is the process for return or replacement of ISL78233ARZ-T?
All ISL78233ARZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL78233ARZ-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 ISL78233ARZ-T part is unused and in its original packaging.
Return procedure for ISL78233ARZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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