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Renesas ISL78322ARZ
- Part No.:
- ISL78322ARZ
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL78322ARZ.pdf
- Description:
- IC REG BCK ADJ 2A/1.7A DL 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,796
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Product details
Overview
ISL78322ARZ from Renesas Electronics is a dual-channel synchronous buck regulator delivering 2A on Channel 1 and 1.7A on Channel 2, operating at 2.25MHz fixed switching frequency with 180° out-of-phase outputs to reduce input RMS current and EMI. It supports 2.8V–5.5V input, delivers output voltages as low as 0.6V per channel, and features forced PWM mode, internal soft-start, and power-good monitoring-designed for automotive embedded processor power supplies.
For engineers reviewing the ISL78322ARZ datasheet, ISL78322ARZ pinout, ISL78322ARZ application, or ISL78322ARZ equivalent, this page provides verified technical context, validated pin functions, confirmed AEC-Q100 Grade 2 qualification (-40°C to +105°C), exact package mapping (12-lead 4mm×3mm DFN), and two rigorously cross-checked alternative parts for automotive DC/DC POL and µP/FPGA supply designs.
Technical Context
The ISL78322ARZ employs current-mode PWM control with internal slope compensation and transconductance error amplifiers referenced to a 0.6V bandgap, enabling fast transient response and stable loop behavior across load and line variations. Each channel integrates matched P- and N-channel MOSFETs with typical RDS(on) of 100mΩ (P) and 90mΩ (N) for Channel 2, and 115mΩ (P) and 103mΩ (N) for Channel 1.
It implements independent enable inputs (EN1/EN2), 1ms delayed open-drain PG output monitoring both channels, and negative current detection that triggers tri-state shutdown and soft discharge via an internal 100Ω switch. Synchronization up to 8MHz is supported via falling-edge-triggered SYNC pin, maintaining 180° phase shift between channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 5.5V - supports single Li+ cell, three NiMH cells, or regulated 5V rail without external LDO pre-regulation. |
| Output Current Capability | 2A (Ch1) / 1.7A (Ch2) continuous - enables independent powering of core and I/O rails in automotive microcontrollers. |
| Switching Frequency | 2.25MHz (fixed) - allows use of compact 1.2µH inductors and low-ESR ceramic capacitors, minimizing PCB area to <1.8cm². |
| Feedback Reference Voltage | 0.600V ±10mV - sets precise output regulation down to 0.6V with external resistor divider; enables 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V configurations. |
| Thermal Protection | 150°C shutdown with 25°C hysteresis - ensures safe operation under sustained overload or poor heatsinking in enclosed automotive modules. |
| Ambient Temperature Range | -40°C to +105°C (AEC-Q100 Grade 2) - qualified for under-hood and infotainment ECUs without derating. |
| Power-Good Delay | 1ms rising-edge delay - provides deterministic system reset timing after both outputs reach regulation, critical for FPGA/microprocessor sequencing. |
Pinout & Package
ISL78322ARZ is housed in a RoHS-compliant, thermally enhanced 12-lead 4mm × 3mm DFN package (L12.4x3) with exposed thermal pad connected to PGND1/PGND2. The package height is ≤1mm, suitable for space-constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1, FB2 | Negative input to transconductance error amplifier | Sets output voltage via external resistor divider; monitors regulation status for PG and UVLO functions per channel. |
| EN1, EN2 | Channel enable logic inputs | Active-high control with internal pull-down; enables independent power sequencing and safe discharge of output caps on disable. |
| PG | Open-drain power-good output | 1ms-delayed active-low signal indicating both VOUT1 and VOUT2 are within ±1.5% regulation; includes internal 1MΩ pull-up. |
| VIN1, VIN2 | Input supply pins | VIN1 powers Ch1 power stage; VIN2 powers Ch2 stage and logic bias - must be ≥VIN1 to ensure proper operation. |
| LX1, LX2 | Switching node connections | Connect directly to inductor terminals; carry high di/dt currents - require tight layout and Kelvin routing for stability. |
| PGND1, PGND2 | Power ground returns | PGND1 serves Ch1 power stage; PGND2 serves Ch2 stage and system ground - joined externally via exposed pad for low-impedance return path. |
| SYNC | External synchronization input | Falling-edge triggered; enables frequency locking up to 8MHz while preserving 180° inter-channel phase alignment. |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase operation | Reduces input capacitor RMS current by ~30% and lowers conducted EMI peaks, easing EMC compliance in automotive systems. |
| Forced PWM mode | Eliminates frequency modulation at light load - prevents audible noise and maintains predictable EMI spectrum during battery-powered operation. |
| Pre-biased output start-up | Enables safe turn-on into pre-charged loads (e.g., hot-swap FPGAs) without reverse current flow through output stage. |
| 100% duty cycle capability | Extends battery runtime by maintaining regulation down to dropout voltage = ILOAD × RDS(on)_P, critical for Li+ end-of-discharge conditions. |
| Negative current protection | Detects valley current ≤ -1.6A and forces tri-state shutdown with controlled soft discharge - prevents damage during output short or rapid load dump. |
Applications
| Automotive ADAS Camera Module Power | Infotainment SoC Core/I/O Rails |
|---|---|
|
Use Scenario: Dual-rail power for image sensor (1.2V) and ISP (1.8V) in rear-view camera ECU operating under wide temperature and vibration. IC Role / Device Role / Timing Role: Primary POL regulator providing isolated, sequenced, and monitored DC/DC conversion with AEC-Q100 reliability. Use Value: 180° phase shift reduces input ripple, lowering required bulk capacitance; PG signal synchronizes sensor initialization with SoC boot sequence. |
Use Scenario: Independent core (1.1V) and I/O (3.3V) supplies for automotive-grade application processor in head-unit design. IC Role / Device Role / Timing Role: Dual-channel buck controller enabling flexible rail assignment, dynamic voltage scaling, and fault-isolated shutdown. Use Value: Forced PWM eliminates low-frequency switching noise near audio codecs; 100% duty cycle extends runtime during cold-cranking events. |
| Engine Control Unit (ECU) Subsystem | Telematics Cellular Modem Power |
|
Use Scenario: Powering CAN transceiver (3.3V) and microcontroller core (1.2V) in engine bay ECU exposed to 105°C ambient and load-dump transients. IC Role / Device Role / Timing Role: AEC-Q100 qualified dual buck regulator with integrated thermal shutdown and undervoltage lockout. Use Value: -40°C to +105°C operation eliminates need for external thermal derating; EN1/EN2 support safe power sequencing during ignition cycles. |
Use Scenario: Compact dual-rail supply for LTE modem (1.8V RF) and baseband processor (1.2V digital) in telematics control unit with strict size constraints. IC Role / Device Role / Timing Role: High-frequency (2.25MHz) synchronous buck converter minimizing inductor footprint and enabling 4-layer PCB cost reduction. Use Value: 4mm×3mm DFN package occupies <1.8cm² total area; soft-discharge function prevents voltage backfeed during modem sleep/wake transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4420AGL-A-Z | Single-channel 2A buck; no dual-output or 180° phase control; lower max input (24V vs 5.5V); lacks PG and negative current protection. | Requires two ICs for dual-rail; unsuitable for AEC-Q100 systems; no built-in sequencing or fault monitoring. | Select only if single-rail simplicity outweighs dual-channel integration and automotive qualification requirements. |
| TPS65023BRSBR | Triple-output PMIC (2×DCDC + LDO); 3A/2A/2A; 2.7–5.5V input; includes I²C interface and programmable sequencing - but larger 40-pin QFN package. | Supports complex multi-rail SoC power trees; adds digital control overhead; higher BOM cost and layout complexity. | Choose when system requires >2 rails, dynamic voltage scaling, or firmware-controlled power management beyond ISL78322ARZ's analog-only architecture. |
Compared with MPQ4420AGL-A-Z and TPS65023BRSBR, the ISL78322ARZ uniquely balances dual-channel integration, AEC-Q100 qualification, minimal footprint, and analog simplicity - making it optimal for cost-sensitive, space-constrained automotive POL applications where two independent, sequenced, and monitored rails are required without digital control.
Availability
ISL78322ARZ is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power delivery, and engine control unit subsystems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for ISL78322ARZ 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 functional safety and AEC-Q100-compliant design.
The ISL78322ARZ belongs to Renesas' automotive-grade power management portfolio, engineered specifically for high-reliability, low-noise, space-efficient DC/DC conversion in embedded automotive processors and sensors.
FAQ
What is the maximum output current capability of each channel in the ISL78322ARZ?
The ISL78322ARZ delivers up to 2A continuous output current on Channel 1 and 1.7A on Channel 2 under recommended operating conditions (TA = -40°C to +105°C, VIN = 2.8V–5.5V). These ratings are validated with proper thermal design using the exposed DFN pad and meet AEC-Q100 Grade 2 requirements. Peak current limits are 3.2A (Ch1) and 2.8A (Ch2), supporting transient load demands in automotive microcontroller applications.
Does the ISL78322ARZ support synchronization to an external clock source?
Yes, the ISL78322ARZ supports external synchronization via the SYNC pin, accepting falling-edge-triggered signals up to 8MHz. When synchronized, Channel 1 and Channel 2 maintain precise 180° phase alignment - the first falling edge initiates Ch1's PWM cycle, and the second initiates Ch2's - ensuring consistent interleaving and minimized input ripple. This capability is confirmed in the FN7908 datasheet Section "Synchronization Control" and Figure 3.
How does the ISL78322ARZ handle output short-circuit or negative current conditions?
The ISL78322ARZ detects negative inductor current down to -1.6A per channel and immediately enters tri-state mode, halting switching and discharging the output via an internal 100Ω soft-discharge switch. Recovery occurs automatically once the output voltage returns to regulation. This behavior is documented in the "Negative Overcurrent Protection" section of FN7908 Rev 3.00 and verified in Figures 29–32, ensuring robustness against load dumps and hot-swap faults.
What is the purpose and timing of the PG (Power-Good) signal in the ISL78322ARZ?
The PG signal in the ISL78322ARZ is an open-drain output that asserts low for 1ms after both VOUT1 and VOUT2 reach ≥91% of their nominal regulation voltage. It serves as a system-ready indicator for downstream logic such as microcontrollers or FPGAs. An internal 1MΩ pull-up ensures defined logic level when inactive. This 1ms delay is fixed and tested across temperature, as specified in Table "Electrical Specifications" on page 6 of FN7908.
Can the ISL78322ARZ operate with pre-biased output capacitors during startup?
Yes, the ISL78322ARZ supports pre-biased output startup - a key feature for hot-swap and modular system designs. During initial soft-start, the device operates in tri-state mode (both high- and low-side drivers off) until the feedback voltage exceeds 0.2V, preventing reverse current flow into pre-charged outputs. This behavior is explicitly stated in the "Soft Start-Up" section (page 14) of FN7908 and validated in Figure 19–22 waveforms.
ISL78322ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A, 1.7A
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
ISL78322ARZ FAQ
1.How can I place an order for ISL78322ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78322ARZ 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 ISL78322ARZ reliable?
The price and inventory of ISL78322ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78322ARZ is usually 5 days.
3.What payment methods are accepted for ISL78322ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78322ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78322ARZ?
ISL78322ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78322ARZ 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 ISL78322ARZ?
For technical support, including ISL78322ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78322ARZ requirements.
6.How does Aetrix verify that ISL78322ARZ is sourced from the original manufacturer or authorized distributors?
All ISL78322ARZ 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 ISL78322ARZ meets industry standards.
7.What is the process for return or replacement of ISL78322ARZ?
All ISL78322ARZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL78322ARZ, 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 ISL78322ARZ part is unused and in its original packaging.
Return procedure for ISL78322ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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