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Renesas ISL8033IRZ
- Part No.:
- ISL8033IRZ
- Manufacturer:
- Renesas
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ISL8033IRZ.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:801
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Product details
Overview
ISL8033IRZ from Renesas (formerly Intersil) is a dual-channel synchronous buck regulator IC delivering 3A per channel at 1MHz fixed switching frequency, with integrated P- and N-channel MOSFETs, 0.8V reference, and 180° out-of-phase operation for EMI reduction. It operates from 2.85V–6V input, supports 0.8V–3.3V adjustable outputs, and delivers up to 95% efficiency in Li+-powered µC/FPGA power supplies.
For engineers reviewing the ISL8033IRZ datasheet, ISL8033IRZ pinout, ISL8033IRZ application, or ISL8033IRZ equivalent, this page provides verified technical context, confirmed pin functions, real-world load regulation data (2 mV/A), thermal shutdown behavior (150°C), and validated alternatives for POL and low-voltage embedded power design.
Technical Context
The ISL8033IRZ implements current-mode PWM control with internal slope compensation, transconductance error amplifier (20 µA/V), and 0.2 Ω trans-resistance network for stable loop response. Each channel features independent enable (EN1/EN2), power-good (PG1/PG2), and feedback (FB1/FB2) with 0.8V ±10mV regulation voltage.
It uses internal digital soft-start (1.5ms ramp), 100% duty-cycle operation for ultra-low dropout (<250mV at 3A), and hiccup-mode overcurrent protection triggered after 17 consecutive fault cycles. Phase-shifted 180° operation reduces input RMS current and improves thermal distribution across the 4mm×4mm QFN package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current per Channel | 3A guaranteed minimum with ISET tied to VDD; supports pre-biased startup and soft-discharge shutdown. |
| Input Voltage Range | 2.85V–6V DC - compatible with single Li+ cell, three NiMH cells, or regulated 5V rail. |
| Switching Frequency | Fixed 1MHz - enables use of compact 1.0–3.3µH inductors and 2×22µF ceramic output capacitors. |
| Feedback Reference Voltage | 0.800V ±10mV - sets output voltage via external resistor divider; supports 0.8V–3.3V range. |
| Quiescent Supply Current | 15–40mA typical - optimized for low-power battery operation without compromising transient response. |
| Thermal Shutdown Threshold | 150°C with 25°C hysteresis - ensures safe recovery at 125°C and prevents thermal runaway in dense layouts. |
| Efficiency | Up to 95% at 3A - achieved via integrated 50mΩ P- and N-MOSFETs and minimized gate drive losses. |
Pinout & Package
ISL8033IRZ is housed in a thermally enhanced 24-lead 4mm×4mm QFN package with exposed thermal pad (PD) requiring connection to PGND. Pin pitch is 0.5mm; maximum height is 1mm. Package conforms to RoHS and Pb-free reflow standards (JEDEC J-STD-020 MSL3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX1, LX2 | Switch node (Ch1/Ch2) | Connects to inductor high-side terminal; carries high di/dt switching current; requires tight layout and local decoupling. |
| PGND1, PGND2 | Power ground (Ch1/Ch2) | Separate low-impedance return paths for each channel's power stage to minimize cross-talk and ground bounce. |
| FB1, FB2 | Feedback input (Ch1/Ch2) | Inverting input to transconductance error amplifier; sets output voltage via resistor divider to 0.8V reference. |
| EN1, EN2 | Enable input (Ch1/Ch2) | Logic-controlled start/stop; pulls output capacitor to PGND during shutdown via 100Ω internal discharge switch. |
| PG1, PG2 | Power-good output (Ch1/Ch2) | Open-drain 1ms-delayed signal indicating valid regulation; sinks 1mA at 0.3V max for system sequencing. |
| ISET | Current limit selection | Configures peak overload current: 4.8A (VDD), 3.3A (GND), or 4.8A (floating); enables flexible OCP tuning. |
| VIN1, VIN2, VDD | Input supply rails | VIN1/VIN2 power respective channels; VDD supplies logic core - all require local 22µF ceramic decoupling. |
| SYNC | External synchronization | Negative-edge-triggered input supporting up to 6MHz sync; enables precise phase alignment in multi-rail systems. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck regulation | Two independent 1MHz regulators in one QFN - eliminates discrete controller + FET count and saves >5.46cm² PCB area. |
| 180° out-of-phase operation | Reduces input ripple current by ~70% and lowers EMI filter requirements versus in-phase dual converters. |
| 100% duty-cycle capability | Enables seamless dropout operation down to <250mV at 3A - extends usable battery life in portable applications. |
| Independent digital soft-start (1.5ms) | Prevents inrush current and output overshoot during power-up; supports controlled sequencing with µC/FPGA cores. |
| Hiccup-mode overcurrent protection | Locks out after 17 consecutive faults and auto-restarts after four soft-start delays - protects against sustained shorts. |
| Internal current-mode compensation | Eliminates need for external compensation components; stabilizes loop across full load/line/temp range with 27pF/390kΩ network. |
Applications
| DC/DC POL Modules | µC/µP and FPGA Core Power |
|---|---|
Use Scenario: Point-of-load conversion in space-constrained telecom line cards requiring dual 1.2V/1.8V rails. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator providing isolated, sequenced, and monitored core voltages. Use Value: 180° phase shift cuts input capacitor RMS current by 70%, reducing required capacitance and board footprint. |
Use Scenario: Powering ARM-based microcontrollers and Xilinx Artix-7 FPGAs with strict 0.8V–1.2V tolerance and fast load transients. IC Role / Device Role / Timing Role: Primary core voltage regulator with pre-biased startup, soft-start, and independent PG signaling. Use Value: 2 mV/A load regulation and 95% peak efficiency maintain voltage accuracy under dynamic CPU/FPGA loads. |
| Li-ion Battery-Powered Devices | Bar Code Readers & Portable Scanners |
Use Scenario: Single-cell Li+ powered handheld test equipment needing 3.3V I/O and 1.2V logic rails. IC Role / Device Role / Timing Role: Dual-output buck converter operating across full 2.85V–4.2V battery range with 100% duty-cycle support. Use Value: Ultra-low 8µA shutdown current and 1MHz fixed frequency extend runtime while enabling small 1.5µH inductors. |
Use Scenario: Compact barcode scanners requiring robust, low-noise dual-rail power with ESD-hardened I/O pins. IC Role / Device Role / Timing Role: Main power IC with integrated MOSFETs, thermal shutdown, and 4kV HBM ESD rating on all pins. Use Value: Integrated negative current protection (-2.5A threshold) prevents damage during hot-plug or cable disconnect events. |
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 |
|---|---|---|---|
| ISL8033AIRZ | 2.5MHz fixed switching frequency vs. ISL8033IRZ's 1MHz; requires smaller 0.47–1.5µH inductors. | Better suited for ultra-compact designs where PCB area is critical; higher switching loss reduces peak efficiency by ~2–3%. | Select ISL8033AIRZ when minimizing inductor size outweighs efficiency trade-off; not drop-in due to different frequency-dependent component values. |
| TPS65270RGET | Dual 3A/2A outputs; 2.2MHz sync-capable; includes LDO for auxiliary rail; no 100% duty cycle mode. | Supports mixed analog/digital systems needing clean auxiliary bias; lacks ISL8033IRZ's ultra-low dropout capability. | Choose TPS65270RGET when auxiliary LDO integration and tighter output voltage matching (±1%) are prioritized over battery-endurance optimization. |
Compared with ISL8033IRZ, ISL8033AIRZ enables smaller magnetics but sacrifices efficiency and thermal headroom, while TPS65270RGET adds system integration at the cost of dropout performance and independent channel control.
Availability
ISL8033IRZ is available at Aetrix Electronics and suitable for DC/DC POL modules, µC/FPGA core power, and Li-ion battery-powered devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL8033IRZ 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 ICs including the ISL8033IRZ.
The ISL8033IRZ belongs to Renesas' high-efficiency synchronous buck regulator family, designed specifically for low-voltage, high-current point-of-load applications in portable, embedded, and communications equipment.
FAQ
What is the maximum output voltage supported by the ISL8033IRZ?
The ISL8033IRZ supports output voltages from 0.8V up to 3.3V, set via an external resistor divider connected to FB1 or FB2. The internal 0.8V reference and ±10mV tolerance ensure accurate regulation across temperature and load; higher voltages are not supported due to internal error amplifier and OCP thresholds.
Does the ISL8033IRZ support external synchronization?
Yes, the ISL8033IRZ supports external synchronization up to 6MHz via the SYNC pin, which accepts negative-edge-triggered logic signals. This allows precise phase alignment between channels and synchronization with system clocks - a feature absent in the pin-compatible ISL8033AIRZ variant.
How does the ISL8033IRZ handle output short-circuit conditions?
The ISL8033IRZ employs hiccup-mode overcurrent protection: upon detecting 17 consecutive overcurrent events, it shuts down and attempts auto-restart after four soft-start delays. During short circuit, the upper MOSFET turns off immediately, limiting energy dissipation and preventing thermal damage to the ISL8033IRZ.
Can the ISL8033IRZ operate with a pre-biased output?
Yes, the ISL8033IRZ supports startup into a pre-biased output voltage - a critical feature for hot-swap and power-sequencing applications. Its control architecture avoids reverse current flow during initial ramp-up, ensuring safe and reliable operation when VOUT is already present at power-on.
What is the thermal resistance (θJA) of the ISL8033IRZ package?
The ISL8033IRZ in its 24-lead 4mm×4mm QFN package has a typical junction-to-ambient thermal resistance (θJA) of 36°C/W under standard JEDEC test conditions. Its exposed thermal pad (PD) must be soldered to PGND with multiple vias to achieve this rating and sustain 3A/channel continuous operation.
ISL8033IRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-VFQFN 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):
- 2.85V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 3A
- Frequency - Switching:
- 1.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
ISL8033IRZ FAQ
1.How can I place an order for ISL8033IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8033IRZ 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 ISL8033IRZ reliable?
The price and inventory of ISL8033IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8033IRZ is usually 5 days.
3.What payment methods are accepted for ISL8033IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8033IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8033IRZ?
ISL8033IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8033IRZ 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 ISL8033IRZ?
For technical support, including ISL8033IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8033IRZ requirements.
6.How does Aetrix verify that ISL8033IRZ is sourced from the original manufacturer or authorized distributors?
All ISL8033IRZ 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 ISL8033IRZ meets industry standards.
7.What is the process for return or replacement of ISL8033IRZ?
All ISL8033IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL8033IRZ, 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 ISL8033IRZ part is unused and in its original packaging.
Return procedure for ISL8033IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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