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Renesas ISL78322ARZ-T
- Part No.:
- ISL78322ARZ-T
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL78322ARZ-T.pdf
- Description:
- IC REG BCK ADJ 2A/1.7A DL 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,103
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Product details
Overview
ISL78322ARZ-T 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 with 180° out-of-phase switching to reduce input ripple and EMI. It supports 2.8V–5.5V input (single Li⁺ or regulated 5V), regulates outputs down to 0.6V, and features forced PWM mode, internal soft-start, and power-good monitoring - used in automotive embedded processor power supplies.
For engineers reviewing the ISL78322ARZ-T datasheet, ISL78322ARZ-T pinout, ISL78322ARZ-T application, or ISL78322ARZ-T equivalent, key selection considerations include AEC-Q100 Grade 2 qualification (-40°C to +105°C), dual independent output regulation, 100% duty cycle capability for ultra-low dropout, and negative current detection with soft-discharge shutdown.
Technical Context
The ISL78322ARZ-T employs current-mode PWM control per channel with internal slope compensation, enabling fast transient response and stable loop behavior across load and line variations. Each channel integrates matched P- and N-channel MOSFETs (115mΩ/103mΩ typical RDS(on) for Ch1) and uses a 0.6V bandgap reference with transconductance error amplifiers.
Phase interleaving is fixed at 180°, and synchronization up to 8MHz is supported via the SYNC pin with falling-edge triggering. The device implements dual overcurrent protection (peak: 3.2A/2.8A; valley: -1.6A), hiccup-mode short-circuit recovery, and thermal shutdown at 150°C with 25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 5.5V - supports single-cell Li⁺, three NiMH, or regulated 5V rails without external LDO pre-regulation. |
| Output Current (Ch1 / Ch2) | 2A / 1.7A continuous - enables independent powering of µC cores and I/O rails in automotive SoC applications. |
| Switching Frequency | 2.25MHz (fixed) or syncable up to 8MHz - permits use of compact 1.2µH inductors and low-ESR ceramic capacitors. |
| Feedback Reference Voltage | 0.600V ±10mV - sets precise output voltage via external resistor divider; supports outputs as low as 0.6V with <±1% accuracy. |
| Power-Good Delay | 1ms - provides synchronized, glitch-free system reset assertion after both outputs reach regulation. |
| Thermal Shutdown Threshold | 150°C with 25°C hysteresis - ensures safe operation under sustained high-power conditions in engine bay or ADAS modules. |
| Quiescent Supply Current | 1.00mA typical - minimizes standby loss in always-on automotive subsystems. |
Pinout & Package
ISL78322ARZ-T is housed in a thermally enhanced 4mm × 3mm, 12-lead DFN package (exposed pad) with 1mm max height, optimized for high-density automotive PCB layouts and efficient heat dissipation via PGND-connected thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1, FB2 | Channel 1/2 feedback inputs | Connect to resistor dividers to set output voltage; internally referenced to 0.6V; used by PG and UVLO monitoring. |
| EN1, EN2 | Channel 1/2 enable inputs | Active-high logic control; initiates soft-start and discharges output capacitors during shutdown. |
| PG | Power-good open-drain output | 1ms-delayed active-low signal indicating both outputs are within regulation; includes internal 1MΩ pull-up. |
| VIN1, VIN2 | Channel 1/2 input supply pins | VIN2 powers logic and must be ≥ VIN1; each requires local 10µF ceramic decoupling to respective PGND. |
| LX1, LX2 | Channel 1/2 switch-node outputs | Drive external inductors; connect directly to inductor terminals; require low-inductance layout for EMI control. |
| PGND1, PGND2 | Power ground returns | Separate grounds for each power stage; exposed pad must be connected to both for electrical integrity and thermal performance. |
| SYNC | External synchronization input | Falling-edge triggered; forces PWM mode when pulled low; enables 180° phase alignment up to 8MHz sync frequency. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent synchronous buck regulation | Enables discrete voltage rail generation (e.g., 2.5V core + 1.8V I/O) without cross-talk or shared component constraints. |
| 180° out-of-phase operation | Reduces RMS input current by ~30% and lowers conducted EMI peaks, easing compliance with CISPR 25 Class 5. |
| Forced PWM mode | Eliminates frequency dithering at light load, preventing audible noise and RF interference in sensitive analog/audio domains. |
| Negative current detection & soft-discharge | Prevents reverse current flow into battery during shutdown; discharges outputs via 100Ω internal FET to avoid latch-up or bus contention. |
| AEC-Q100 Grade 2 qualification | Validated for -40°C to +105°C ambient operation - suitable for front-end ADAS ECUs, infotainment head units, and body control modules. |
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 with CAN interface and thermal constraints. IC Role / Device Role / Timing Role: Primary POL regulator providing isolated, low-noise, phase-interleaved DC/DC conversion with 1ms PG sequencing. Use Value: 2.25MHz operation enables <1.8cm² total solution size; AEC-Q100 qualification ensures reliability in vibration-prone mounting locations. |
Use Scenario: Independent 2.5V/2A core and 1.1V/1.7A I/O supplies for quad-core ARM-based infotainment processor. IC Role / Device Role / Timing Role: Dual-channel buck controller managing power-up sequence via EN1/EN2 timing and coordinated PG assertion. Use Value: 100% duty cycle extends runtime during battery brownout; forced PWM eliminates audio-band switching noise in speaker amplifiers. |
| Engine Control Unit (ECU) Sensor Interface | Automotive Telematics Gateway |
|
Use Scenario: Powering 3.3V CAN transceiver and 1.8V microcontroller in under-hood ECU with wide temperature cycling. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with integrated OCP and thermal shutdown for fault-tolerant operation. Use Value: -40°C to +105°C rating and 97% peak efficiency minimize thermal derating; negative current limit prevents backfeed during sensor hot-swap. |
Use Scenario: Dual-rail supply for LTE modem (1.8V) and GPS receiver (3.3V) in cellular-connected telematics unit with strict EMC limits. IC Role / Device Role / Timing Role: Synchronized buck converter reducing input ripple and enabling smaller bulk capacitance near battery feed. Use Value: 180° phase shift cuts input capacitor RMS current by 41%, allowing smaller 10µF X5R ceramics instead of larger tantalum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4436-AEC1 | Single-channel 3.5A; no dual output or 180° interleaving; lower 0.6V ref tolerance (±1.5% vs ±0.83%). | Requires two ICs for dual-rail designs; lacks integrated PG for dual outputs. | Choose when higher per-channel current (>2A) is needed and board space allows duplication. |
| TPS650332A-Q1 | Triple-output (2A/1.5A/0.3A); fixed 1.8V/3.3V/1.2V; no adjustable FB; 2.1MHz nominal fSW. | Fixed outputs limit flexibility; no support for sub-1.2V rails or custom sequencing. | Choose for cost-sensitive, fixed-voltage automotive clusters where programmability is unnecessary. |
Compared with MPQ4436-AEC1 and TPS650332A-Q1, the ISL78322ARZ-T uniquely delivers dual independently adjustable outputs with 180° interleaving, AEC-Q100 Grade 2 rating, and integrated dual-channel PG - making it optimal for space-constrained, multi-rail automotive processors requiring design flexibility and robustness.
Availability
ISL78322ARZ-T is available at Aetrix Electronics and suitable for automotive ADAS systems, infotainment SoC power delivery, and engine control unit (ECU) sensor interface applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for ISL78322ARZ-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, and automotive SoCs, with deep expertise in functional safety and ASIL-compliant power management.
The ISL78322ARZ-T belongs to Renesas' ISL78xxx automotive power management family, designed specifically for high-reliability, high-efficiency point-of-load regulation in engine bay, ADAS, and infotainment systems.
FAQ
What is the maximum output current capability of each channel in the ISL78322ARZ-T?
The ISL78322ARZ-T delivers up to 2A continuous output current on Channel 1 and 1.7A on Channel 2 under recommended operating conditions (TA ≤ +105°C, proper thermal layout). Peak current limits are 3.2A (Ch1) and 2.8A (Ch2), verified per datasheet Table on page 5. Derating applies above +85°C ambient.
Does the ISL78322ARZ-T support external synchronization, and what is its sync frequency range?
Yes, the ISL78322ARZ-T supports external synchronization via the SYNC pin with falling-edge triggering. It accepts sync signals from 5.4MHz to 8.0MHz, and the internal channels operate at half the sync frequency - maintaining 180° phase alignment. Below 2.25MHz sync, the internal oscillator resumes control.
How does the ISL78322ARZ-T handle output short-circuit or negative current events?
The ISL78322ARZ-T detects negative inductor current down to -1.6A and immediately enters tri-state mode while discharging the output via an internal 100Ω FET. For hard shorts, it triggers hiccup-mode protection after 17 consecutive overcurrent cycles, with restart attempts spaced by four soft-start periods - fully detailed in the Theory of Operation section of FN7908 Rev 3.00.
What is the purpose of the exposed thermal pad on the ISL78322ARZ-T DFN package?
The exposed pad on the ISL78322ARZ-T must be soldered to PGND1 and PGND2 planes using multiple vias. It serves dual roles: (1) electrical - completing the low-impedance return path for high-frequency switching currents, and (2) thermal - reducing θJA to 41°C/W and θJC to 3°C/W, critical for sustaining 2A/1.7A loads at +105°C ambient.
Can the ISL78322ARZ-T operate with a prebiased output, and how is this enabled?
Yes, the ISL78322ARZ-T supports start-up with prebiased outputs via its pulse-frequency modulation (PFM) behavior during soft-start initiation. When FB voltage is below 0.2V at startup, the IC operates at 1/3 normal frequency and enters tri-state mode until regulation is reached - preventing reverse current flow and ensuring safe hot-plug operation in modular automotive systems.
ISL78322ARZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for ISL78322ARZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78322ARZ-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 ISL78322ARZ-T reliable?
The price and inventory of ISL78322ARZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78322ARZ-T is usually 5 days.
3.What payment methods are accepted for ISL78322ARZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78322ARZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78322ARZ-T?
ISL78322ARZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78322ARZ-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 ISL78322ARZ-T?
For technical support, including ISL78322ARZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78322ARZ-T requirements.
6.How does Aetrix verify that ISL78322ARZ-T is sourced from the original manufacturer or authorized distributors?
All ISL78322ARZ-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 ISL78322ARZ-T meets industry standards.
7.What is the process for return or replacement of ISL78322ARZ-T?
All ISL78322ARZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL78322ARZ-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 ISL78322ARZ-T part is unused and in its original packaging.
Return procedure for ISL78322ARZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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