My Inquiry
My Account
Renesas ISL78235AARZ-T7A
- Part No.:
- ISL78235AARZ-T7A
- Manufacturer:
- Renesas
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ISL78235AARZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,426
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL78235AARZ-T7A from Renesas Electronics is an AEC-Q100 qualified 5A automotive synchronous buck regulator in a 5mm×5mm Wettable Flank QFN package. It delivers up to 5A continuous output from 2.7V–5.5V input, features 35mΩ/11mΩ integrated high-side/low-side MOSFETs, 2MHz default switching frequency, and 100% duty-cycle operation enabling <250mV dropout at full load-ideal for powering automotive infotainment SoCs.
For engineers reviewing the ISL78235AARZ-T7A datasheet, ISL78235AARZ-T7A pinout, ISL78235AARZ-T7A application, or ISL78235AARZ-T7A equivalent, key selection criteria include its -40°C to +125°C operating range, adjustable 500kHz–4MHz switching frequency, PFM/PWM light-load mode control, internal 1ms power-good timer, and soft-stop output discharge during shutdown.
Technical Context
The ISL78235AARZ-T7A employs peak current mode control with slope compensation for stable loop dynamics across wide VIN/VOUT ratios and fast transient response. Its 100ns minimum on-time supports wide regulation ranges, including low-VOUT applications down to 0.6V via external feedback divider.
It integrates dual MOSFET drivers, hiccup-mode overcurrent protection, output overvoltage and overtemperature shutdown, and a dedicated open-drain power-good (PG) output with 1ms delay. The SYNC pin enables seamless external clock synchronization from 1MHz to 4MHz or selectable PFM/PWM operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5A continuous - supports high-current SoC/FPGA core rails without external current sharing. |
| Input Voltage Range | 2.7V to 5.5V - compatible with automotive 3.3V/5V supply rails and battery-backed systems. |
| Switching Frequency | Adjustable 500kHz–4MHz; default 2MHz - balances efficiency, size, and EMI for compact automotive PCB layouts. |
| High-Side RDS(on) | 35mΩ typical at VIN = 5V - reduces conduction loss and improves full-load efficiency up to 95%. |
| Power-Good Delay | 1ms fixed - ensures reliable system sequencing by delaying PG assertion until output stabilizes. |
| Operating Temp Range | -40°C to +125°C - rated for under-hood automotive environments using the 5mm×5mm WFQFN package. |
| Protection Features | Hiccup OCP, OTP, OVP, UVLO - autonomous fault recovery without host intervention in harsh environments. |
Pinout & Package
The ISL78235AARZ-T7A is housed in a 16-lead Wettable Flank Quad Flat No-Lead (WFQFN) package measuring 5mm × 5mm with exposed thermal pad. This RoHS-compliant e4 termination package supports automated optical solder-joint inspection and provides enhanced thermal performance (θJA = 33°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,16) | Main 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; internally discharged via 100Ω resistor during shutdown to prevent floating voltage. |
| FB (Pin 9) | Feedback input | Senses output voltage via resistor divider; sets VOUT from 0.6V to rail minus losses; used by PG and UVLO circuits. |
| EN (Pin 5) | Enable control | Active-high logic input; asserts soft-stop discharge of output capacitor when pulled low. |
| PG (Pin 3) | Power-good indicator | Open-drain output with 1ms delay; requires external pull-up; signals regulated output status to host controller. |
| SYNC (Pin 4) | Mode/synchronization control | Selects PFM (GND), PWM (VIN), or external sync (1–4MHz); no glitch during transition. |
| FS (Pin 6) | Frequency set | Resistor-to-GND sets fSW from 500kHz–4MHz; tied to VIN for 2MHz default. |
| SS (Pin 7) | Soft-start timing | 1ms internal ramp when grounded; external capacitor adjusts startup time (≤33nF). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated HS/LS MOSFETs | 35mΩ P-channel / 11mΩ N-channel - eliminates external switches, reduces BOM count and layout area. |
| 100% Duty-Cycle Operation | Enables <250mV dropout at 5A - critical for low-VIN, high-IOUT applications like post-regulation from 3.3V rails. |
| Adjustable Light-Load Mode | PFM for efficiency at light loads; forced PWM for low-noise/low-EMI operation - configurable per system requirement. |
| Soft-Stop Output Discharge | Internal 100Ω switch discharges VOUT during disable - prevents back-powering or latch-up in multi-rail systems. |
| AEC-Q100 Qualified | Rated for automotive Grade 1 (-40°C to +125°C) - validated for reliability in safety-critical infotainment and ADAS subsystems. |
Applications
| Automotive Infotainment Power | SoC/FPGA Core Supply |
|---|---|
Use Scenario: Powering display processors and multimedia SoCs in head units and digital clusters. IC Role / Device Role / Timing Role: Primary DC/DC POL regulator delivering stable 1.2V/1.8V/3.3V at up to 5A with fast transient response. Use Value: AEC-Q100 qualification and -40°C to +125°C operation ensure uninterrupted function in vehicle cabin temperature extremes. | Use Scenario: Providing tightly regulated core voltage to automotive-grade FPGAs and microcontrollers. IC Role / Device Role / Timing Role: Synchronous buck converter with 100ns min-on-time supporting low-VOUT regulation down to 0.6V. Use Value: Integrated MOSFETs and internal compensation reduce external component count while maintaining ±1% reference accuracy over temperature. |
| Video Processor Power | DC/DC POL Module |
Use Scenario: Supplying power to real-time video encoding/decoding ASICs in rear-seat entertainment systems. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with 95% peak efficiency and low output ripple. Use Value: Adjustable 500kHz–4MHz switching frequency allows EMI tuning to avoid sensitive video band frequencies. | Use Scenario: Embedded power module design for space-constrained automotive ECUs requiring high-density power conversion. IC Role / Device Role / Timing Role: Monolithic buck IC with wettable flank package enabling AOI-compatible assembly and thermal reliability. Use Value: Common pinout with ISL78233 (3A) and ISL78234 (4A) allows scalable design reuse without PCB revision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL78234AARZ-T7A | 4A max output current; identical pinout and feature set except lower current rating and thermal derating. | Lower power SoCs or systems with margin-based current requirements where 5A headroom is unnecessary. | Select when 4A suffices and cost optimization is prioritized; drop-in replacement with same layout. |
| MPQ4433GL-AEC1-P | Monolithic 5A buck with 3.8V–60V input range; higher VIN capability but larger 4mm×4mm QFN package and no wettable flank option. | Higher-voltage automotive subsystems (e.g., body control modules) requiring >5.5V input tolerance. | Choose for extended input range; not pin-compatible-requires layout change and revalidation. |
Compared with ISL78235AARZ-T7A, ISL78234AARZ-T7A offers identical functionality at reduced current capacity for cost-sensitive designs, while MPQ4433GL-AEC1-P extends input voltage range at the expense of package compatibility and thermal inspection capability.
Availability
ISL78235AARZ-T7A is available at Aetrix Electronics and suitable for automotive infotainment power, SoC/FPGA core supply, and video processor power applications requiring stable component supply, AEC-Q100 compliance, and extended temperature operation.
Supply support for ISL78235AARZ-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 SoC solutions for automotive, industrial, and infrastructure markets.
The ISL78235AARZ-T7A belongs to Renesas' automotive-grade power management IC portfolio, designed specifically for high-reliability, high-efficiency point-of-load regulation in demanding vehicular environments.
FAQ
What is the maximum continuous output current supported by the ISL78235AARZ-T7A?
The ISL78235AARZ-T7A supports 5A of continuous output current across its full operating temperature range of -40°C to +125°C when implemented with proper thermal design using the 5mm×5mm WFQFN package. Peak current limit is 7.8A typical at +25°C, with thermal derating applied above +105°C per datasheet specifications.
Does the ISL78235AARZ-T7A require external compensation components?
The ISL78235AARZ-T7A supports both internal and external compensation. When the COMP pin is tied to VDD, internal compensation is enabled and no external network is required. For improved loop flexibility and stability across varying output capacitors or loads, external compensation (RCOMP/CCOMP) is recommended and fully supported per the datasheet design guidelines.
How does the ISL78235AARZ-T7A handle short-circuit conditions?
The ISL78235AARZ-T7A implements hiccup-mode overcurrent protection. During a short circuit, it limits peak current, shuts down, waits for a recovery period (~8 soft-start cycles), then attempts restart. This cycle repeats until the fault clears, preventing thermal runaway and enabling autonomous recovery without host intervention.
What is the purpose of the exposed pad (EPAD) on the ISL78235AARZ-T7A package?
The exposed pad on the ISL78235AARZ-T7A must be connected to SGND to ensure proper electrical reference and optimal thermal performance. Multiple vias to the SGND plane are required beneath the pad to achieve the specified θJA = 33°C/W and maintain junction temperature within limits under 5A load conditions.
Can the ISL78235AARZ-T7A operate with 100% duty cycle, and what is its practical benefit?
Yes, the ISL78235AARZ-T7A supports true 100% duty-cycle operation, enabling output voltages approaching the input rail minus small conduction losses. At 5A, this delivers <250mV dropout - essential for powering low-VOUT loads (e.g., 1.8V) directly from a 3.3V supply without intermediate regulation stages.
ISL78235AARZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-VQFN 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:
- 5A
- Frequency - Switching:
- 420kHz ~ 4.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (5x5)
ISL78235AARZ-T7A FAQ
1.How can I place an order for ISL78235AARZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78235AARZ-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 ISL78235AARZ-T7A reliable?
The price and inventory of ISL78235AARZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78235AARZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL78235AARZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78235AARZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78235AARZ-T7A?
ISL78235AARZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78235AARZ-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 ISL78235AARZ-T7A?
For technical support, including ISL78235AARZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78235AARZ-T7A requirements.
6.How does Aetrix verify that ISL78235AARZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL78235AARZ-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 ISL78235AARZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL78235AARZ-T7A?
All ISL78235AARZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL78235AARZ-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 ISL78235AARZ-T7A part is unused and in its original packaging.
Return procedure for ISL78235AARZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL78235AARZ-T7A Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
