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Renesas ISL78322ARZ-T7A
- Part No.:
- ISL78322ARZ-T7A
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL78322ARZ-T7A.pdf
- Description:
- IC REG BCK ADJ 2A/1.7A DL 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,403
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Product details
Overview
ISL78322ARZ-T7A from Renesas (formerly Intersil) is a dual-channel synchronous buck regulator delivering 2A on Channel 1 and 1.7A on Channel 2, operating at 2.25MHz fixed frequency with 180° out-of-phase switching to reduce input RMS current and EMI. It supports 2.8V–5.5V input, 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-T7A datasheet, ISL78322ARZ-T7A pinout, ISL78322ARZ-T7A application, or ISL78322ARZ-T7A equivalent, key selection criteria include AEC-Q100 Grade 2 qualification (-40°C to +105°C), dual independent output regulation, 100% duty cycle capability for low-dropout operation, negative current detection, and thermal shutdown with 25°C hysteresis.
Technical Context
The ISL78322ARZ-T7A employs current-mode PWM control with internal slope compensation, enabling fast transient response and stable loop behavior across load and line variations. Each channel integrates P- and N-channel MOSFETs with typical ON-resistances of 115mΩ/103mΩ (Ch1) and 125mΩ/112mΩ (Ch2), supporting peak current limits of 3.2A (Ch1) and 2.8A (Ch2).
It implements phase-shifted 180° operation between channels, external synchronization up to 8MHz (with half-frequency per channel), and dedicated enable pins (EN1/EN2) for independent power sequencing. The device includes integrated soft-discharge (100Ω internal switch), 1ms delayed PG signal, and undervoltage lockout with 2.8V rising threshold.
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 (Ch1 / Ch2) | 2A / 1.7A continuous - enables powering core logic (e.g., µC/FPGA I/O rails) and auxiliary domains simultaneously. |
| Switching Frequency | 2.25MHz (fixed) - allows use of compact 1.2µH inductors and low-ESR ceramic capacitors, minimizing PCB area (<1.8cm² total). |
| Feedback Reference Voltage | 0.600V ±10mV - sets precise output regulation point; enables programmable VOUT from 0.6V using external resistor divider. |
| Power-Good Delay | 1ms - provides synchronized, glitch-free system reset assertion after both outputs reach 91% of nominal voltage. |
| Thermal Shutdown Threshold | +150°C with +25°C hysteresis - ensures safe recovery after overtemperature events without manual intervention. |
| Ambient Temperature Range | -40°C to +105°C (AEC-Q100 Grade 2) - qualified for under-hood automotive applications and industrial embedded systems. |
Pinout & Package
ISL78322ARZ-T7A is housed in a 4mm × 3mm, 12-lead DFN package with 1mm max height and exposed thermal pad (connected to PGND1/PGND2). The package supports high-density layout and efficient heat dissipation via multiple vias to ground plane.
| 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. |
| EN1, EN2 | Channel enable control inputs | Active-high logic enables independent startup/shutdown sequencing; drives internal discharge FET when low. |
| PG | Open-drain power-good output | 1ms-delayed active-low signal indicating both outputs are within 91% of target; includes internal 1MΩ pull-up. |
| VIN1, VIN2 | Input supply connections | VIN1 powers Channel 1 power stage; VIN2 powers Channel 2 and logic bias - must be ≥ VIN1 for proper operation. |
| LX1, LX2 | Switching node terminals | Connect to inductor high-side; carry high di/dt currents - require short, low-inductance PCB routing. |
| PGND1, PGND2 | Power ground returns | PGND1 serves Channel 1 power stage; PGND2 serves Channel 2 and system ground - joined externally at exposed pad. |
| SYNC | External synchronization input | Negative-edge triggered; forces PWM mode when grounded or accepts external clock up to 8MHz for EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent synchronous buck regulation | Enables two distinct power domains (e.g., CPU core + I/O) with separate enable, feedback, and current limiting per channel. |
| 180° out-of-phase switching | Reduces input capacitor RMS current by ~30% and lowers conducted EMI compared to in-phase dual converters. |
| Forced PWM mode | Eliminates frequency modulation at light load - critical for noise-sensitive applications like ADAS camera modules. |
| Internal soft-start and soft-discharge | Prevents inrush current during startup and safely discharges output caps during shutdown via 100Ω internal FET. |
| Negative current detection and protection | Halts switching and enters tri-state mode if inductor current falls below -1.6A - prevents reverse conduction damage. |
| 100% duty cycle operation | Maintains regulation down to dropout voltage = ILOAD × RDS(on)_P, extending battery runtime in portable automotive systems. |
Applications
| Automotive ADAS Camera Power Supply | Infotainment SoC Core Rail |
|---|---|
Use Scenario: Dual-rail power for image sensor (1.2V) and ISP (1.8V) in rear-view camera module with strict EMI limits. IC Role / Device Role / Timing Role: Primary DC/DC converter providing isolated, low-noise, phase-shifted outputs with forced PWM mode. Use Value: 2.25MHz operation avoids AM band interference; 180° phasing reduces input ripple; AEC-Q100 Grade 2 ensures reliability in vehicle cabin environments. |
Use Scenario: Powering multi-core application processor requiring independent 1.1V core and 1.8V I/O rails in head-unit design. IC Role / Device Role / Timing Role: Dual-channel POL regulator with sequenced EN1/EN2 control for safe boot-order compliance. Use Value: Internal soft-start prevents bus collapse during SoC initialization; 1ms PG signal synchronizes FPGA configuration timing. |
| Automotive Body Control Module (BCM) | Industrial Motor Control MCU Supply |
Use Scenario: Powering microcontroller (2.5V) and CAN transceiver (3.3V) in distributed BCM node with limited board space. IC Role / Device Role / Timing Role: Compact dual-buck solution replacing discrete regulators; uses shared input cap and small inductors. Use Value: 4×3mm DFN footprint saves >40% area vs. two separate 3×3mm regulators; -40°C to +105°C rating matches under-dash thermal profile. |
Use Scenario: Generating 1.2V core and 3.3V interface rails for ARM-based motor controller in factory automation PLC. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC/DC stage with hiccup-mode short-circuit protection. Use Value: Peak efficiency >97% reduces thermal load in sealed enclosures; thermal shutdown with hysteresis prevents cycling during overload. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023BRSBR | Triple-output (2×1.5A + 1×1.8A), 2.25MHz, but lacks 100% duty cycle and negative current protection. | Designed for handheld devices; not AEC-Q100 qualified; narrower temp range (-40°C to +85°C). | Choose for cost-sensitive consumer applications where automotive qualification and ultra-low dropout are not required. |
| MPQ4420AGL-AEC1-Z | Dual 2A/2A, 2.2MHz, AEC-Q100 Grade 1 (-40°C to +125°C), but no 180° phase shift or forced PWM mode. | Optimized for higher ambient temps; uses external compensation; requires larger output capacitance for same stability. | Choose when extended temperature margin is critical and EMI reduction via phase shifting is handled externally. |
Compared with TPS65023BRSBR and MPQ4420AGL-AEC1-Z, the ISL78322ARZ-T7A uniquely combines AEC-Q100 Grade 2 qualification, 180° phase shift, forced PWM mode, and negative current protection - making it optimal for noise-constrained, safety-critical automotive subsystems where board area and thermal performance are tightly constrained.
Availability
ISL78322ARZ-T7A is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power delivery, and body control module designs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for ISL78322ARZ-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 acquired Intersil in 2017 and maintains full product support, documentation, and qualification for legacy Intersil power management ICs including the ISL78322 series.
The ISL78322 product line was designed specifically for automotive embedded processor power - emphasizing AEC-Q100 qualification, high-frequency operation, compact packaging, and robust protection features for under-hood and cabin applications.
FAQ
What is the maximum output current supported by each channel of the ISL78322ARZ-T7A?
The ISL78322ARZ-T7A 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 across -40°C to +105°C ambient per FN7908 Rev 3.00.
Does the ISL78322ARZ-T7A support external synchronization, and what is its frequency range?
Yes, the ISL78322ARZ-T7A accepts an external clock on the SYNC pin with negative-edge triggering, supporting synchronization from 5.4MHz to 8MHz. At 8MHz input, each channel operates at 4MHz; the internal oscillator defaults to 2.25MHz when external sync falls below that threshold - all specified in the Electrical Specifications table on page 5 of FN7908.
How does the ISL78322ARZ-T7A handle output short-circuit conditions?
The ISL78322ARZ-T7A uses hiccup-mode short-circuit protection: upon detecting 17 consecutive overcurrent events (via CSA1/CSA2), it shuts down and attempts automatic restart after four soft-start periods. Recovery is confirmed in Figures 34 and 36 of FN7908, showing full recovery within 10ms after fault removal.
Is the ISL78322ARZ-T7A compatible with prebiased output voltages during startup?
Yes, the ISL78322ARZ-T7A supports startup into prebiased outputs by entering pulse-frequency mode initially - preventing negative inductor current flow. This behavior is explicitly enabled in forced PWM mode and documented in the "Start-up with prebiased output" feature list on page 1 of FN7908.
What thermal performance can be expected from the ISL78322ARZ-T7A in a standard 4-layer PCB layout?
In a typical 4-layer board with 2oz copper, 6 thermal vias under the exposed pad, and 1in² copper pour on inner layers, the ISL78322ARZ-T7A achieves θJA ≈ 41°C/W (per datasheet page 5). At 2A/1.7A full load and +85°C ambient, junction temperature remains below 135°C - well within the 150°C shutdown threshold.
ISL78322ARZ-T7A 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-T7A FAQ
1.How can I place an order for ISL78322ARZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78322ARZ-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 ISL78322ARZ-T7A reliable?
The price and inventory of ISL78322ARZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78322ARZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL78322ARZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78322ARZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78322ARZ-T7A?
ISL78322ARZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78322ARZ-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 ISL78322ARZ-T7A?
For technical support, including ISL78322ARZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78322ARZ-T7A requirements.
6.How does Aetrix verify that ISL78322ARZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL78322ARZ-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 ISL78322ARZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL78322ARZ-T7A?
All ISL78322ARZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL78322ARZ-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 ISL78322ARZ-T7A part is unused and in its original packaging.
Return procedure for ISL78322ARZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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