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Renesas ISL78233ARZ-T7A
- Part No.:
- ISL78233ARZ-T7A
- Manufacturer:
- Renesas
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ISL78233ARZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 3A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,383
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Product details
Overview
ISL78233ARZ-T7A 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 such as infotainment SoC core supplies.
For engineers reviewing the ISL78233ARZ-T7A datasheet, ISL78233ARZ-T7A pinout, ISL78233ARZ-T7A application, or ISL78233ARZ-T7A equivalent, key selection criteria include its 3A output capability, 100% duty-cycle operation enabling <200mV dropout at full load, internal/external compensation flexibility, soft-stop output discharge, and shared pinout with ISL78234 for scalable power design.
Technical Context
The ISL78233ARZ-T7A employs current-mode PWM control with slope compensation (440mV/Ts) and pulse-by-pulse current limiting, enabling fast transient response and stable loop behavior across 500kHz–4MHz operation. Its dual-MOSFET architecture integrates a low-RDS(on) high-side P-FET (35mΩ typ.) and low-side N-FET (11mΩ typ.), minimizing conduction loss and external component count.
It supports both forced continuous conduction mode (CCM) and discontinuous conduction mode (DCM) via SYNC pin configuration, with hiccup-mode overcurrent protection, thermal shutdown at 150°C, and ±1% reference voltage accuracy (0.593V–0.606V) over -40°C to +125°C. The 1ms PG timer and soft-start ramp (1ms default) ensure controlled power-up sequencing in safety-critical automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports μC/FPGA core rails without external current boosting. |
| Input Voltage Range | 2.7V to 5.5V - compatible with automotive battery (cold-crank down to 2.7V) and 3.3V/5V intermediate rails. |
| Switching Frequency | 500kHz–4MHz (default 2MHz) - enables compact 1.0μH inductor and small ceramic output caps (2×22μF). |
| FET RDS(on) | P-FET: 35mΩ, N-FET: 11mΩ (typ. at VIN=5V) - delivers >95% peak efficiency at 1.8V/3A, reducing thermal stress. |
| Reference Voltage | 0.600V ±1% - sets output via external resistor divider; enables precise 1.2V–3.6V programmable VOUT. |
| Operating Temp | -40°C to +125°C junction - qualified per AEC-Q100 Grade 1, suitable for under-hood and infotainment modules. |
| Protection Features | Hiccup OCP, OVP, UVP, thermal shutdown, negative current limit, soft-stop discharge - eliminates need for discrete fault management circuitry. |
Pinout & Package
ISL78233ARZ-T7A is housed in a RoHS-compliant 3mm × 3mm, 16-lead Thin Quad Flat No-Lead (TQFN) package with exposed thermal pad connected to SGND. The package supports high-density PCB layouts and achieves θJA = 43°C/W in standard JEDEC board conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 16) | Input power supply | Accepts 2.7V–5.5V; requires ≥2×22μF ceramic decoupling close to pins for stability and EMI reduction. |
| PHASE (Pins 13–15) | Switching node | Connects to inductor high-side; discharged via 100Ω internal resistor during shutdown to prevent output ringing. |
| FB (Pin 9) | Feedback input | Senses output voltage via resistor divider; referenced to 0.600V internal bandgap; enables adjustable VOUT from 0.6V to near VIN. |
| EN (Pin 5) | Enable control | Active-high logic input; pulls output to 0V and discharges capacitor via internal soft-stop switch when low. |
| PG (Pin 3) | Power-good indicator | Open-drain output with 1ms delay after regulation achieved; requires external 10kΩ–100kΩ pull-up to VIN. |
| FS (Pin 6) | Frequency select | Resistor-to-SGND sets fSW; tied to VIN for default 2MHz; enables EMI optimization and inductor size trade-offs. |
| SS (Pin 7) | Soft-start timing | Connected to SGND for 1ms ramp; capacitor to SGND extends ramp time - prevents inrush current in multi-rail systems. |
| COMP (Pin 8) | Error amplifier output | Used for external loop compensation; connect to VIN for internal compensation (reduces BOM to 3 external parts). |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables <200mV dropout at 3A, critical for low-VIN battery backup and post-regulation scenarios. |
| Internal soft-start (1ms) | Prevents input voltage sag and overshoot during startup; configurable up to longer ramp with external capacitor. |
| Soft-stop output discharge | Internally discharges output capacitor on disable - eliminates need for external bleed resistor in safety-critical shutdown paths. |
| Shared pinout with ISL78234 | Allows seamless upgrade from 3A to 4A output by swapping IC and adjusting inductor/capacitor values - no PCB redesign. |
| AEC-Q100 Grade 1 | Validated for automotive ambient temperatures (-40°C to +125°C) and robust against ESD (5kV HBM), latch-up (100mA), and thermal stress. |
Applications
| Automotive Infotainment SoC Power | ADAS Camera Module Core Supply |
|---|---|
Use Scenario: Powering 1.2V/1.8V cores of Qualcomm SA8155P or TI TDA4VM SoCs in head units and digital cockpits. IC Role / Device Role / Timing Role: Primary POL buck regulator delivering tightly regulated, low-noise DC power with fast load-step response. Use Value: 95% efficiency at 2A reduces thermal load in sealed enclosures; AEC-Q100 qualification ensures reliability over 15-year vehicle lifecycle. |
Use Scenario: Supplying image signal processor (ISP) and MIPI interface in rear-view or surround-view camera ECUs. IC Role / Device Role / Timing Role: High-efficiency step-down converter with soft-start and PG monitoring for safe boot sequencing. Use Value: 1ms PG delay and 1.2V output accuracy ±1% guarantee clean reset assertion and sensor initialization timing compliance. |
| Industrial PLC I/O Module Rail | Li-ion Powered Portable Test Equipment |
Use Scenario: Generating 3.3V/3A auxiliary rail for isolated communication interfaces (RS-485, CAN FD) in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC converter supporting wide input range and industrial temperature operation. Use Value: 3mm×3mm TQFN footprint saves space on dense carrier boards; -40°C to +125°C rating ensures uptime in uncontrolled cabinet environments. |
Use Scenario: Regulating 1.5V/3A for FPGA-based logic in handheld oscilloscopes or spectrum analyzers powered by single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Synchronous buck converter with ultra-low quiescent current (45µA) to extend battery runtime. Use Value: Discontinuous mode at light load cuts switching losses; 2.7V minimum VIN supports operation down to deeply discharged battery states. |
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-T7A | 4A output rating, identical pinout and feature set; higher current limit (6.7A vs 4.9A) and lower RDS(on) FETs. | Required where system load exceeds 3A or future-proofing for higher-power SoCs is needed. | Select ISL78234ARZ-T7A only if 4A output is required; same layout and compensation allow drop-in upgrade. |
| MP2451DT-LF-Z | 3A output, 2MHz fixed frequency, no SYNC/FS pin; lacks soft-stop discharge, PG timer, and AEC-Q100 qualification. | Suitable for cost-sensitive industrial or consumer applications without automotive reliability requirements. | Choose MP2451DT-LF-Z for non-automotive designs where PG, soft-stop, and extended temp range are not mandatory. |
Compared with ISL78233ARZ-T7A, ISL78234ARZ-T7A offers higher output current and marginally better efficiency at full load, while MP2451DT-LF-Z trades automotive-grade features for lower BOM cost and simpler configuration - making each optimal for distinct reliability and scalability needs.
Availability
ISL78233ARZ-T7A is available at Aetrix Electronics and suitable for automotive infotainment power, ADAS camera module rails, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for ISL78233ARZ-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, and automotive SoCs, with deep expertise in high-reliability power management solutions.
The ISL78233ARZ-T7A belongs to Renesas' ISL7823x automotive buck regulator family, designed specifically for demanding automotive subsystems requiring AEC-Q100 qualification, wide input range, and robust fault protection.
FAQ
What is the maximum continuous output current of the ISL78233ARZ-T7A?
The ISL78233ARZ-T7A delivers up to 3A of continuous output current across the full operating temperature range (-40°C to +125°C). This rating is validated under recommended conditions with proper thermal management using the 3mm×3mm TQFN package's exposed pad connected to SGND. Peak current limit is 4.9A (typ.) at +25°C, derating to 3.7A at temperature extremes.
Does the ISL78233ARZ-T7A support adjustable output voltage?
Yes, the ISL78233ARZ-T7A supports fully adjustable output voltage from 0.6V up to near the input rail using an external resistor divider connected to the FB pin. The internal 0.600V reference has ±1% accuracy over temperature, load, and line, enabling precise regulation of common rails like 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V as confirmed in the datasheet's Component Selection Table.
How does the ISL78233ARZ-T7A handle shutdown and output discharge?
The ISL78233ARZ-T7A implements soft-stop output discharge: when the EN pin is driven low, an internal switch actively discharges the output capacitor through a controlled path, eliminating reliance on external bleed resistors. This ensures rapid, predictable voltage decay essential for functional safety in automotive systems - a feature explicitly documented in the "Discharge Mode (Soft-Stop)" section of the FN8359 datasheet.
Is the ISL78233ARZ-T7A pin-compatible with other devices in the ISL7823x family?
Yes, the ISL78233ARZ-T7A shares an identical 16-pin TQFN footprint and pinout with the ISL78234ARZ-T7A and ISL78235 variants. This allows direct PCB-level upgrades - for example, replacing ISL78233ARZ-T7A with ISL78234ARZ-T7A increases output current to 4A without layout changes, provided inductor and output capacitance are re-evaluated per the datasheet's Component Selection Table.
What protection features are integrated into the ISL78233ARZ-T7A?
The ISL78233ARZ-T7A integrates hiccup-mode overcurrent protection (OCP), overvoltage protection (OVP), undervoltage lockout (UVLO), thermal shutdown (150°C trip), negative current limiting, and power-good monitoring. All protections are fully internal - no external components are required. The OCP uses current-sense amplification and blanking (17 clock pulses), while OVP triggers at 110% nominal VOUT, as specified in the Electrical Specifications table of FN8359 Rev.11.01.
ISL78233ARZ-T7A 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-T7A FAQ
1.How can I place an order for ISL78233ARZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78233ARZ-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 ISL78233ARZ-T7A reliable?
The price and inventory of ISL78233ARZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78233ARZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL78233ARZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78233ARZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78233ARZ-T7A?
ISL78233ARZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78233ARZ-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 ISL78233ARZ-T7A?
For technical support, including ISL78233ARZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78233ARZ-T7A requirements.
6.How does Aetrix verify that ISL78233ARZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL78233ARZ-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 ISL78233ARZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL78233ARZ-T7A?
All ISL78233ARZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL78233ARZ-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 ISL78233ARZ-T7A part is unused and in its original packaging.
Return procedure for ISL78233ARZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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