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Renesas ISL78234ARZ-T
- Part No.:
- ISL78234ARZ-T
- Manufacturer:
- Renesas
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ISL78234ARZ-T.pdf
- Description:
- IC REG BUCK ADJ 4A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,321
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Product details
Overview
ISL78234ARZ-T from Renesas Electronics is a 4A monolithic synchronous buck regulator with integrated 35mΩ P-channel and 11mΩ N-channel MOSFETs, operating from 2.7V–5.5V input to deliver adjustable output voltage down to 0.6V. It features current-mode control, 2MHz default switching frequency (adjustable 500kHz–4MHz), 100% duty-cycle capability for <200mV dropout at 4A, and AEC-Q100 qualification for automotive power rails.
For engineers reviewing the ISL78234ARZ-T datasheet, ISL78234ARZ-T pinout, ISL78234ARZ-T application, or ISL78234ARZ-T equivalent, key selection criteria include its 4A continuous output, -40°C to +125°C junction temperature rating, internal/external compensation flexibility, hiccup-mode overcurrent protection, and soft-stop output discharge during shutdown.
Technical Context
The ISL78234ARZ-T implements a current-mode PWM control architecture 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 integration eliminates external high-side drive complexity while supporting forced continuous or discontinuous conduction mode via SYNC pin configuration.
Functional blocks include a transconductance error amplifier (130µA/V in external compensation mode), 1ms power-good timer with 0.5–2ms rising-edge delay, and comprehensive protection: overtemperature (150°C trip), overvoltage (0.80V PG threshold), negative current limit (-6.0A to -0.6A), and hiccup-mode short-circuit recovery. The FS pin enables resistor-programmable frequency without external clock source dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - supports high-power SoC/FPGA core rails without external current sharing. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), 3.3V/5V system rails, and automotive battery transients. |
| Switching Frequency | 500kHz–4MHz (default 2MHz) - enables compact magnetics (e.g., 1.0µH inductor) and EMI optimization via synchronization. |
| FET ON-Resistance | P-ch 35mΩ / N-ch 11mΩ (typ @ 5V VIN) - minimizes conduction loss and thermal rise at full load. |
| Reference Voltage | 0.600V ±0.007V - enables precise output regulation down to 0.6V with <±1% total accuracy over temp/load/line. |
| Protection Features | Hiccup OCP, -40°C to +125°C operation, 150°C thermal shutdown with 25°C hysteresis, and soft-stop output discharge - ensures robustness in automotive environments. |
| Package | 3mm×3mm 16-lead TQFN (exposed pad) - provides low θJA (43°C/W) and wettable flank compatibility for automated optical inspection. |
Pinout & Package
ISL78234ARZ-T is housed in a 3mm×3mm, 16-lead Thin Quad Flat No-Lead (TQFN) package with exposed thermal pad. The package meets RoHS requirements and is rated for -40°C to +125°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,16) | Input power supply | Accepts 2.7–5.5V; requires ≥2×22µF ceramic decoupling directly to PGND for stability. |
| PHASE (Pins 13–15) | Switching node | Connects to inductor; internally discharged via 100Ω resistor during shutdown to prevent output ringing. |
| PGND (Pins 11,12) | Power ground return | Separate from SGND; must be connected to low-impedance ground plane under exposed pad for thermal and noise control. |
| SGND (Pin 10) | Signal ground reference | Reference for FB, COMP, SS, EN; tied to exposed pad for optimal EMI performance. |
| FB (Pin 9) | Feedback input | Monitors output via resistor divider; sets VOUT = 0.6V × (1 + R2/R3); used for PG and UVLO detection. |
| COMP (Pin 8) | Error amplifier output | External compensation node (R4/C4/C5) or tied to VDD for internal compensation - determines loop stability margin. |
| EN (Pin 5) | Enable control | Active-high logic input; drives device into shutdown with soft-stop output discharge when pulled low. |
| FS (Pin 6) | Frequency select | Resistor-to-SGND sets fSW from 500kHz–4MHz; default 2MHz when tied to VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 35mΩ P-ch + 11mΩ N-ch MOSFETs eliminate external drivers and reduce BOM count to ≤3 external components. |
| 100% Duty-Cycle Operation | Enables <200mV dropout at 4A output - critical for low-VIN applications like post-regulation of Li-ion battery systems. |
| Adjustable Soft-Start | 1ms fixed (SS to SGND) or capacitor-adjustable ramp prevents inrush current and stabilizes startup into large capacitive loads. |
| Power-Good Monitoring | Open-drain PG with 1ms delay and 0.80V rising threshold confirms regulation within ±1% before system release. |
| AEC-Q100 Qualified | Rated for automotive Grade 1 (-40°C to +125°C) with latch-up immunity (100mA) and ESD robustness (5kV HBM). |
Applications
| Automotive Infotainment Power | SoC/FPGA Core Supply |
|---|---|
Use Scenario: Powering ADAS display processors and multimedia SoCs in head units with 12V battery input and tight thermal constraints. IC Role / Device Role / Timing Role: Primary 1.2V/1.8V/3.3V POL regulator delivering up to 4A with fast load-step response and hiccup-mode fault containment. Use Value: Enables compact, thermally efficient power delivery meeting AEC-Q100 reliability requirements without external MOSFETs or complex compensation. |
Use Scenario: Providing stable core voltage to Xilinx Zynq or Intel Cyclone FPGA banks during dynamic reconfiguration and high-speed I/O activity. IC Role / Device Role / Timing Role: Adjustable-output synchronous buck converter with programmable frequency and external compensation for optimized transient performance. Use Value: Delivers 4A at <1% output error across temperature, supporting tight FPGA VCCINT tolerances while minimizing board area vs discrete solutions. |
| Li-ion Battery-Powered Devices | DC/DC POL Modules |
Use Scenario: Regulating single-cell Li-ion (3.0–4.2V) to 1.8V/2.5V for portable medical monitors or industrial handhelds. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating in PFM mode at light load to extend battery runtime, with 45µA quiescent current. Use Value: Achieves >90% efficiency at 100mA and >85% at 4A, reducing thermal load and enabling fanless enclosure designs. |
Use Scenario: Embedded power module for telecom baseband cards requiring scalable 3A/4A/5A outputs with common pinout across family. IC Role / Device Role / Timing Role: Drop-in upgrade path from ISL78233 (3A) to ISL78234 (4A) using identical PCB layout and footprint. Use Value: Shared pinout allows field-upgradable power capacity without redesign - critical for long-lifecycle industrial deployments. |
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 output, 3.8–60V input, 2.5mm×3.5mm QFN - wider VIN range but higher minimum input voltage than ISL78234ARZ-T. | Targets industrial 24V systems; not AEC-Q100 qualified or optimized for sub-3V Li-ion inputs. | Select when input exceeds 5.5V or extended temperature is not required; avoid for automotive or low-VIN battery apps. |
| TPS544B20RTWR | 4A output, 4.5–18V input, 4mm×4mm QFN - includes PMBus interface and digital loop control, no internal soft-start timer. | Suitable for server VR13/VR14 compliance; lacks hiccup-mode OCP and automotive qualification. | Choose for telemetry-enabled systems needing dynamic voltage scaling; not drop-in for ISL78234ARZ-T's analog control and safety features. |
Compared with MPQ4433AGL-A-Z and TPS544B20RTWR, the ISL78234ARZ-T delivers superior low-input-voltage operation (down to 2.7V), integrated soft-stop discharge, and AEC-Q100 qualification - making it uniquely suited for automotive and battery-powered applications where reliability and VIN headroom are critical.
Availability
ISL78234ARZ-T is available at Aetrix Electronics and suitable for automotive infotainment power, SoC/FPGA core supply, and Li-ion battery-powered devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL78234ARZ-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 IC design.
The ISL78234ARZ-T belongs to Renesas' ISL7823x automotive buck regulator family, engineered specifically for demanding automotive power rails including infotainment, ADAS, and body electronics where AEC-Q100 compliance and thermal robustness are mandatory.
FAQ
What is the maximum continuous output current of the ISL78234ARZ-T?
The ISL78234ARZ-T delivers 4A of continuous output current across its full operating temperature range (-40°C to +125°C). This rating is validated under recommended conditions: 2.7V–5.5V input, proper thermal layout with exposed pad connected to SGND, and adequate output capacitance (≥2×22µF). Peak current limit is 5.2–8.1A depending on temperature.
Does the ISL78234ARZ-T support adjustable switching frequency?
Yes, the ISL78234ARZ-T supports adjustable switching frequency from 500kHz to 4MHz using an external resistor (RFS) from the FS pin to SGND. When FS is tied to VIN, it defaults to 2MHz. Frequency adjustment enables optimization of inductor size, efficiency, and EMI profile without requiring external clock sources.
How does the ISL78234ARZ-T handle output short-circuit conditions?
The ISL78234ARZ-T employs hiccup-mode overcurrent protection during short-circuit events. Upon detecting current exceeding the positive peak limit (5.2–8.1A), it shuts down the power stage, waits for an auto-restart period (~8 soft-start cycles), then attempts recovery. This limits average power dissipation and prevents thermal runaway during sustained faults.
Can the ISL78234ARZ-T operate with input voltage below 3.0V?
Yes, the ISL78234ARZ-T operates down to 2.7V input, making it suitable for single-cell Li-ion (3.0–4.2V) and low-VIN automotive applications. Its undervoltage lockout (UVLO) rising threshold is 2.7V, ensuring reliable startup even as battery voltage drops near end-of-discharge.
What is the purpose of the exposed thermal pad on the ISL78234ARZ-T package?
The exposed thermal pad on the ISL78234ARZ-T must be soldered to the SGND plane using multiple vias to achieve optimal thermal performance (θJA = 43°C/W). It serves both electrical (low-impedance signal ground reference) and thermal functions - reducing junction temperature rise by up to 30°C at full 4A load compared to pad isolation.
ISL78234ARZ-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:
- 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-T FAQ
1.How can I place an order for ISL78234ARZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78234ARZ-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 ISL78234ARZ-T reliable?
The price and inventory of ISL78234ARZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78234ARZ-T is usually 5 days.
3.What payment methods are accepted for ISL78234ARZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78234ARZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78234ARZ-T?
ISL78234ARZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78234ARZ-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 ISL78234ARZ-T?
For technical support, including ISL78234ARZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78234ARZ-T requirements.
6.How does Aetrix verify that ISL78234ARZ-T is sourced from the original manufacturer or authorized distributors?
All ISL78234ARZ-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 ISL78234ARZ-T meets industry standards.
7.What is the process for return or replacement of ISL78234ARZ-T?
All ISL78234ARZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL78234ARZ-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 ISL78234ARZ-T part is unused and in its original packaging.
Return procedure for ISL78234ARZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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