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Renesas ISL78234ARZ
- Part No.:
- ISL78234ARZ
- Manufacturer:
- Renesas
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ISL78234ARZ.pdf
- Description:
- IC REG BUCK ADJ 4A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,382
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Product details
Overview
ISL78234ARZ from Renesas Electronics is a monolithic synchronous buck DC/DC regulator delivering 4A continuous output current from a 2.7V–5.5V input, featuring integrated 35mΩ P-channel and 11mΩ N-channel MOSFETs, 2MHz default switching frequency, and AEC-Q100 qualification for automotive infotainment power rails.
For engineers reviewing the ISL78234ARZ datasheet, ISL78234ARZ pinout, ISL78234ARZ application, or ISL78234ARZ equivalent, key selection considerations include its 100% duty-cycle capability (<200mV dropout at 4A), hiccup-mode overcurrent protection, internal/external compensation flexibility, and -40°C to +125°C operating range in a 3mm×3mm TQFN package.
Technical Context
The ISL78234ARZ employs current-mode PWM control with slope compensation (440mV/Ts) and pulse-by-pulse current limiting, enabling fast transient response and stable loop operation across 500kHz–4MHz adjustable frequency. Its dual-MOSFET architecture supports forced continuous conduction mode (reducing EMI) or discontinuous mode (improving light-load efficiency).
Functional blocks include integrated soft-start (1ms fixed or capacitor-adjustable), soft-stop output discharge during shutdown, power-good monitoring with 1ms delay, and comprehensive protection: overvoltage, overtemperature (150°C trip), negative current limit (-2.8A typ), and hiccup-mode short-circuit recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - supports high-current SoC/FPGA core rails without external FETs. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion, automotive 3.3V/5V domains, and post-regulation supplies. |
| Switching Frequency | Adjustable 500kHz–4MHz; default 2MHz - enables compact magnetics and noise-sensitive layout optimization. |
| Reference Voltage | 0.600V ±0.007V - enables precise output regulation down to 0.6V with external resistor divider. |
| Efficiency | Up to 95% at 2MHz - achieved via low RDS(on) FETs (35mΩ HS / 11mΩ LS) and optimized gate drive. |
| Thermal Rating | -40°C to +125°C junction - validated for under-hood automotive environments per AEC-Q100 Grade 1. |
| Protection Features | Hiccup-mode OCP, OVP, UVP, OTP, and negative current limit - ensures robust operation during fault conditions. |
Pinout & Package
ISL78234ARZ is housed in a 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 enhanced thermal dissipation (θJA = 43°C/W).
| 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. |
| PHASE (Pins 13–15) | Switching node | Connects to inductor; discharged via 100Ω internal resistor during shutdown to prevent shoot-through. |
| FB (Pin 9) | Feedback input | Senses output voltage via resistor divider; referenced to 0.6V internal bandgap for precision regulation. |
| COMP (Pin 8) | Error amplifier output | Supports internal compensation (tie to VDD) or external network for loop tuning flexibility. |
| EN (Pin 5) | Enable control | Active-high logic; pulls output capacitor to ground via internal soft-stop switch when disabled. |
| PG (Pin 3) | Power-good indicator | Open-drain output with 1ms delay after regulation; requires external pull-up for system sequencing. |
| FS (Pin 6) | Frequency select | Resistor-to-ground sets switching frequency; tied to VIN for default 2MHz operation. |
| SS (Pin 7) | Soft-start timing | Grounded for 1ms ramp; capacitor-to-SGND extends soft-start for inrush current control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | Monolithic 35mΩ P-ch HS + 11mΩ N-ch LS FETs eliminate external MOSFETs and drivers, reducing BOM count to ≤3 external components. |
| 100% Duty-Cycle Operation | Enables <200mV dropout at 4A load - critical for low-VOUT applications like 1.2V SoC cores fed from 1.5V intermediate rails. |
| AEC-Q100 Qualified | Validated for automotive Grade 1 (-40°C to +125°C), including ESD (5kV HBM), latch-up (100mA), and reflow profile compliance. |
| Flexible Light-Load Modes | Selectable PWM (fixed-frequency, low-noise) or PFM (variable-frequency, high-efficiency) via SYNC pin - optimizes battery life vs. EMI trade-offs. |
| Robust Fault Recovery | Hiccup-mode OCP limits average power during shorts; thermal shutdown (150°C) includes 25°C hysteresis for reliable auto-recovery. |
Applications
| Automotive Infotainment Power | SoC/FPGA Core Supply |
|---|---|
|
Use Scenario: Powering display processors and audio DSPs in head units with strict EMI limits and wide input voltage variation (cold crank to load dump). IC Role / Device Role / Timing Role: Primary POL regulator converting 5V or 3.3V vehicle bus to 1.2V–1.8V SoC core voltage with fast load-step response. Use Value: 2MHz operation minimizes inductor size; PFM mode extends battery runtime during standby; AEC-Q100 ensures reliability in harsh environments. |
Use Scenario: Delivering stable 4A core voltage to application processors (e.g., TI Jacinto, NXP i.MX8) in ADAS domain controllers. IC Role / Device Role / Timing Role: High-current synchronous buck converter with programmable soft-start and PG signaling for safe processor boot sequencing. Use Value: 1ms PG delay aligns with SoC reset timing; 100% duty cycle maintains regulation during brown-out; hiccup OCP prevents thermal runaway during firmware faults. |
| Li-ion Powered Video Systems | DC/DC POL Module |
|
Use Scenario: Regulating single-cell Li-ion (2.7V–4.2V) to 1.5V/1.8V for portable video encoders with dynamic load profiles. IC Role / Device Role / Timing Role: Input-voltage adaptive buck regulator supporting full battery discharge while maintaining tight output regulation. Use Value: Ultra-low 45µA quiescent current extends standby time; adjustable frequency avoids interference with RF bands; soft-stop prevents output voltage overshoot during shutdown. |
Use Scenario: Embedded power module design requiring minimal external components and footprint for space-constrained industrial controllers. IC Role / Device Role / Timing Role: Fully integrated buck IC enabling 3-component BOM (inductor + 2×capacitors) and 3mm×3mm board area. Use Value: Shared pinout with ISL78233 allows scalable 3A→4A upgrades without PCB redesign; wettable flank option (ISL78234AARZ) supports 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 rating, 2.5V–6V input, 500kHz–3MHz freq, no internal soft-start timer, lower RDS(on) (22mΩ/7mΩ), non-AEC-Q100. | Targeted at industrial/commercial systems; lacks 1ms PG delay and automotive qualification. | Choose for cost-sensitive non-automotive designs needing higher efficiency at 5V input. |
| TPS544B20RTWR | 4A rating, 4.5V–18V input, 300kHz–2MHz freq, PMBus interface, 0.6V reference, no hiccup OCP (latch-off only). | Designed for server/telecom with digital control; incompatible input range and protection behavior. | Choose only if digital telemetry and wide-input support outweigh need for automotive qualification and hiccup recovery. |
Compared with MPQ4433AGL-A-Z and TPS544B20RTWR, the ISL78234ARZ delivers automotive-grade reliability, deterministic hiccup-mode fault handling, and seamless integration into AEC-Q100-compliant power trees - making it the preferred choice for infotainment and ADAS subsystems where safety and restartability are mandatory.
Availability
ISL78234ARZ is available at Aetrix Electronics and suitable for automotive infotainment power, SoC/FPGA core supply, and Li-ion powered video systems requiring stable component supply with full lifecycle traceability and long-term production support.
Supply support for ISL78234ARZ 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 ISL78234ARZ belongs to Renesas' ISL7823x automotive buck regulator family, engineered specifically for demanding automotive power rails - emphasizing AEC-Q100 compliance, wide temperature operation, and robust fault protection in safety-critical subsystems.
FAQ
What is the maximum continuous output current of the ISL78234ARZ?
The ISL78234ARZ delivers 4A continuous output current across its full operating temperature range (-40°C to +125°C). This rating is validated with proper PCB thermal design using the 3mm×3mm TQFN package's exposed pad connected to SGND. Peak current limit is 6.7A typical at +25°C, with hiccup-mode protection engaging above this threshold.
Does the ISL78234ARZ support both PWM and PFM modes, and how is mode selection implemented?
Yes, the ISL78234ARZ supports both PWM (fixed-frequency) and PFM (variable-frequency) modes. Mode selection is controlled by the SYNC pin: logic high (≥0.8V) forces PWM mode regardless of load; logic low enables PFM for improved light-load efficiency. An internal 1MΩ pull-down prevents floating states, and external synchronization up to 4MHz is supported via positive-edge trigger.
What is the purpose of the FS pin on the ISL78234ARZ, and what frequency range does it support?
The FS pin on the ISL78234ARZ sets the oscillator switching frequency via an external resistor to SGND. It supports an adjustable range of 500kHz to 4MHz. When left unconnected and tied to VIN, the device defaults to 2MHz operation - balancing efficiency, component size, and EMI performance. Frequency selection directly impacts inductor value and ripple current requirements.
How does the ISL78234ARZ handle overcurrent and short-circuit conditions?
The ISL78234ARZ uses hiccup-mode current limiting during overcurrent or short-circuit events. Upon detection, it shuts down the power stage, waits for a recovery period (~8 soft-start cycles), then attempts restart. This prevents thermal runaway and enables automatic recovery without host intervention - a critical feature for automotive systems where manual reset is impractical.
Is the ISL78234ARZ pin-compatible with other devices in the ISL7823x family, and what does that enable?
Yes, the ISL78234ARZ shares a common pinout with the ISL78233 (3A) and ISL78235 (5A) variants. This enables scalable power design: engineers can upgrade output current capacity (e.g., from 3A to 4A) without modifying PCB layout or firmware, simply by swapping the IC and adjusting the output inductor/capacitor values per the datasheet's component selection table.
ISL78234ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tray
- 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 FAQ
1.How can I place an order for ISL78234ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78234ARZ 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 reliable?
The price and inventory of ISL78234ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78234ARZ is usually 5 days.
3.What payment methods are accepted for ISL78234ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78234ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78234ARZ?
ISL78234ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78234ARZ 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?
For technical support, including ISL78234ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78234ARZ requirements.
6.How does Aetrix verify that ISL78234ARZ is sourced from the original manufacturer or authorized distributors?
All ISL78234ARZ 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 meets industry standards.
7.What is the process for return or replacement of ISL78234ARZ?
All ISL78234ARZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL78234ARZ, 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 part is unused and in its original packaging.
Return procedure for ISL78234ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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