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Renesas ISL78234ARZ-T7A
- Part No.:
- ISL78234ARZ-T7A
- Manufacturer:
- Renesas
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ISL78234ARZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 4A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,034
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Product details
Overview
ISL78234ARZ-T7A from Renesas Electronics is a 4A monolithic synchronous buck regulator optimized for automotive and industrial point-of-load applications, delivering up to 95% efficiency across 2.7V–5.5V input with 0.6V reference accuracy, 2MHz default switching frequency, and integrated 35mΩ P-channel / 11mΩ N-channel MOSFETs for minimal external component count.
For engineers reviewing the ISL78234ARZ-T7A datasheet, ISL78234ARZ-T7A pinout, ISL78234ARZ-T7A application, or ISL78234ARZ-T7A equivalent, key selection criteria include its AEC-Q100 qualification, 100% duty-cycle capability (<200mV dropout at 4A), hiccup-mode overcurrent protection, soft-stop output discharge, and configurable PWM/PFM operation - all in a thermally enhanced 3mm×3mm TQFN package.
Technical Context
The ISL78234ARZ-T7A implements current-mode PWM control with slope compensation (440mV/Ts) and pulse-by-pulse current limiting, enabling fast transient response and stable loop behavior across wide load and line variations. Its dual-MOSFET power stage integrates a 35mΩ high-side P-FET and 11mΩ low-side N-FET, supporting 100% duty-cycle operation for ultra-low dropout.
Operation is configurable via FS (500kHz–4MHz), SYNC (PWM/PSM/sync-in), and EN pins; soft-start is fixed at 1ms or adjustable via SS capacitor; and internal/external compensation options support flexible loop tuning. Protection includes hiccup-mode OCP, thermal shutdown (150°C), overvoltage, undervoltage, and negative current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - supports high-power μP/FPGA 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. |
| Reference Voltage | 0.600V ±0.7% - enables precise output regulation down to 0.6V with external resistor divider. |
| Switching Frequency | Adjustable 500kHz–4MHz; default 2MHz - balances size (small inductor/capacitors) and efficiency. |
| Efficiency | Up to 95% at 4A - achieved via low RDS(on) FETs (35mΩ HS / 11mΩ LS) and optimized gate drive. |
| Thermal Rating | -40°C to +125°C junction - qualified per AEC-Q100 Grade 1 for under-hood automotive use. |
| Protection Features | Hiccup OCP, thermal shutdown (150°C), UVLO (2.7V rising), OV/UV monitoring via PG, soft-stop discharge - ensures robust system-level fault recovery. |
Pinout & Package
ISL78234ARZ-T7A is housed in a RoHS-compliant, Pb-free 16-lead 3mm×3mm Thin Quad Flat No-Lead (TQFN) package with exposed thermal pad connected to SGND. The package supports high-density PCB layouts and delivers θJA = 43°C/W in standard JEDEC board conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,16) | Input power supply | Accepts 2.7V–5.5V; requires ≥2×22µF ceramic decoupling close to pins for stability and EMI suppression. |
| PHASE (13–15) | Switching node | Connects directly to inductor; internally discharged via 100Ω resistor during shutdown to prevent voltage ringback. |
| FB (9) | Feedback input | Senses output voltage via resistor divider; sets VOUT = 0.6V × (1 + R2/R3); monitors regulation for PG assertion. |
| EN (5) | Enable control | Active-high logic input; pulls output to 0V and discharges VOUT capacitor via internal soft-stop switch when low. |
| PG (3) | Power-good indicator | Open-drain output with 1ms delay after regulation; asserts high when VOUT is within ±4% of target (UVP/OVP thresholds defined). |
| FS (6) | Frequency select | Resistor-to-ground sets fSW: 402kΩ → 420kHz, 42.2kΩ → 4.2MHz; tied to VIN for default 2MHz operation. |
| SYNC (4) | Mode control / sync input | High = forced PWM; low = PFM; external clock edge-triggered sync up to 4MHz - reduces EMI in noise-sensitive systems. |
| SS (7) | Soft-start timing | 1ms internal ramp when shorted to SGND; capacitor to SGND extends ramp time - prevents inrush current and overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive applications operating from -40°C to +125°C ambient, including infotainment and ADAS subsystems. |
| Integrated power stage | 35mΩ P-channel high-side + 11mΩ N-channel low-side MOSFETs eliminate external switches and reduce BOM to ≤3 external components. |
| 100% duty-cycle operation | Enables <200mV dropout at 4A - critical for battery-powered systems where input voltage may dip near output level. |
| Configurable light-load mode | PFM mode reduces quiescent current to 45µA; PWM mode maintains fixed frequency for predictable EMI and lower noise. |
| Internal/external compensation | Default internal compensation simplifies layout; external network (R/C across COMP–SGND) enables fine-tuned loop stability for diverse output capacitors and loads. |
Applications
| Automotive Infotainment Power | μP/FPGA Core Supply |
|---|---|
|
Use Scenario: Powering SoC, DSP, and video processors in head units and digital clusters with strict thermal and EMI constraints. IC Role / Device Role / Timing Role: Primary 1.2V/1.8V/3.3V POL regulator delivering 4A peak current with fast load-step response. Use Value: AEC-Q100 qualification and 125°C operation ensure reliability in hot vehicle cabins; 2MHz switching minimizes inductor size for compact module designs. |
Use Scenario: Providing tightly regulated core voltage to microprocessors and FPGAs in industrial controllers and edge AI devices. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter with programmable soft-start and precise 0.6V reference for accurate VDD control. Use Value: 95% peak efficiency and <200mV dropout extend battery runtime; hiccup OCP and thermal shutdown protect against sustained overload faults. |
| Li-ion Battery-Powered Devices | DC/DC POL Modules |
|
Use Scenario: Regulating output from single-cell Li-ion (2.7–4.2V) to 1.5V/1.8V/2.5V rails in portable medical or test equipment. IC Role / Device Role / Timing Role: Input-voltage adaptive buck regulator with PFM mode to maximize battery life during standby. Use Value: 45µA quiescent current in PFM and 3.8µA shutdown current minimize parasitic drain; small 3mm×3mm footprint saves PCB area. |
Use Scenario: Building compact, high-density DC/DC modules for telecom and server applications requiring rapid design iteration. IC Role / Device Role / Timing Role: Monolithic buck IC with shared pinout across ISL78233/ISL78234 family - enables scalable power upgrades without PCB redesign. Use Value: Identical pinout between 3A and 4A variants allows hardware reuse; wettable flank WFQFN option available for automated optical inspection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4433AGL-A-Z | 4A rated, 2.5–5.5V input, 500kHz–3MHz adjustable fSW, no integrated PG, non-AEC-Q100 | Lacks power-good signal and automotive qualification; suited for industrial/commercial only | Select when AEC-Q100 is not required and PG monitoring is handled externally |
| TPS543320RTWR | 4A rated, 4–18V input, 400kHz–2.2MHz fSW, PMBus interface, higher VIN range, larger 4mm×4mm QFN | Targets higher-input industrial systems; adds digital configurability but increases complexity and cost | Select when input exceeds 5.5V or digital telemetry and margining are needed |
Compared with MPQ4433AGL-A-Z and TPS543320RTWR, the ISL78234ARZ-T7A delivers superior automotive readiness (AEC-Q100), tighter reference accuracy (±0.7%), and smaller footprint (3mm×3mm), while trading off digital interface and extended input range for simplicity and thermal performance in space-constrained 5V-domain designs.
Availability
ISL78234ARZ-T7A is available at Aetrix Electronics and suitable for automotive infotainment power, μP/FPGA core supply, and Li-ion battery-powered devices requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for ISL78234ARZ-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 high-reliability, safety-critical electronics.
The ISL78234ARZ-T7A belongs to Renesas' ISL7823x automotive-grade synchronous buck regulator family, designed specifically for demanding point-of-load applications in infotainment, ADAS, and body electronics where efficiency, thermal resilience, and functional safety are essential.
FAQ
What is the maximum continuous output current supported by the ISL78234ARZ-T7A?
The ISL78234ARZ-T7A supports 4A of continuous output current across the full operating temperature range (-40°C to +125°C). This rating is validated under recommended thermal conditions using the 3mm×3mm TQFN package with proper PCB copper pour and vias to the exposed pad. Peak current limit is 6.7A at +25°C, with hiccup-mode protection engaging above this threshold.
Does the ISL78234ARZ-T7A require external compensation components?
The ISL78234ARZ-T7A supports both internal and external compensation. Internal compensation is enabled by connecting the COMP pin to VDD, eliminating the need for external R/C networks in typical applications. External compensation - using resistors and capacitors between COMP and SGND - is recommended for designs requiring optimized transient response with specific output capacitor types or high-current loads.
How does the ISL78234ARZ-T7A handle output capacitor discharge during shutdown?
When the EN pin is driven low, the ISL78234ARZ-T7A activates an internal soft-stop switch that actively discharges the output capacitor through a controlled path. This prevents residual voltage from interfering with downstream circuitry and ensures safe, predictable power-down sequencing - a critical feature for automotive and industrial systems with multiple rail dependencies.
Can the ISL78234ARZ-T7A operate with input voltage as low as the desired output voltage?
Yes - the ISL78234ARZ-T7A supports 100% duty-cycle operation, allowing it to maintain regulation even when input voltage drops to within ~200mV of the output voltage at 4A load. This capability is essential for maintaining system uptime during brown-out conditions in battery-powered applications, such as automotive start-stop cycles or single-cell Li-ion discharge profiles.
Is the ISL78234ARZ-T7A pin-compatible with other devices in the ISL7823x family?
Yes - the ISL78234ARZ-T7A shares identical pinout and package dimensions with the ISL78233 (3A version) and ISL78235 (5A version) in the same 3mm×3mm TQFN variant. This common footprint enables scalable power design: upgrading from 3A to 4A output requires only a BOM change, with no PCB layout revision needed.
ISL78234ARZ-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:
- 4A
- 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)
ISL78234ARZ-T7A FAQ
1.How can I place an order for ISL78234ARZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78234ARZ-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 ISL78234ARZ-T7A reliable?
The price and inventory of ISL78234ARZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78234ARZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL78234ARZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78234ARZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78234ARZ-T7A?
ISL78234ARZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78234ARZ-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 ISL78234ARZ-T7A?
For technical support, including ISL78234ARZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78234ARZ-T7A requirements.
6.How does Aetrix verify that ISL78234ARZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL78234ARZ-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 ISL78234ARZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL78234ARZ-T7A?
All ISL78234ARZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL78234ARZ-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 ISL78234ARZ-T7A part is unused and in its original packaging.
Return procedure for ISL78234ARZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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