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Renesas ISL8033AIRZ-T
- Part No.:
- ISL8033AIRZ-T
- Manufacturer:
- Renesas
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ISL8033AIRZ-T.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,014
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Product details
Overview
ISL8033AIRZ-T from Renesas Electronics (formerly Intersil) is a dual-channel synchronous buck regulator IC delivering 3A per channel with fixed 2.5MHz switching frequency, integrated P- and N-channel MOSFETs, 0.8V reference, and 180° out-of-phase operation for EMI reduction-designed for compact Li-ion–powered FPGA and µP core voltage regulation.
For engineers reviewing the ISL8033AIRZ-T datasheet, ISL8033AIRZ-T pinout, ISL8033AIRZ-T application, or ISL8033AIRZ-T equivalent, key selection criteria include its 2.5MHz fixed-frequency operation (vs. 1MHz ISL8033), 2.85V–6V input range, independent enable/PG pins per channel, 100% duty-cycle dropout capability, and QFN-24 4×4mm package with exposed thermal pad.
Technical Context
The ISL8033AIRZ-T implements current-mode PWM control with internal slope compensation, transconductance error amplifiers (20µA/V), and 0.2Ω trans-resistance compensation network. Each channel features independent soft-start (1.5ms ramp), hiccup-mode overcurrent protection triggered after 17 consecutive faults, and negative current limiting at –2.5A.
It operates in forced PWM mode when SYNC is high, supports pre-biased startup, and delivers 95% peak efficiency at 3A/1.8V output from 5V input. The 180° phase shift between channels reduces input RMS current and input capacitor stress while maintaining tight output regulation (±2% over line/load/temp).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 2.5MHz - enables use of sub-1µH inductors and smaller ceramic output capacitors for space-constrained POL designs. |
| Output Current per Channel | 3A guaranteed minimum - supports FPGA I/O banks and dual-core µP cores without external current boosting. |
| Input Voltage Range | 2.85V to 6V - compatible with single Li-ion (3.0–4.2V), three NiMH (3.6V), or regulated 5V rails. |
| Feedback Reference Voltage | 0.800V ±10mV - sets precise low-voltage outputs (e.g., 1.2V, 1.5V, 1.8V) using standard resistor dividers. |
| Quiescent Supply Current | 30–70mA typical at no load - balances light-load efficiency against fast transient response in always-on subsystems. |
| Shutdown Current | 8–20µA - minimizes battery drain during system sleep modes in portable instrumentation. |
| Thermal Shutdown Threshold | 150°C with 25°C hysteresis - provides robust protection during sustained overload or poor PCB thermal design. |
Pinout & Package
ISL8033AIRZ-T is housed in a thermally enhanced 24-lead 4mm × 4mm QFN package (L24.4x4D) with an exposed PGND pad (Pin 25) requiring direct connection to PCB ground plane via multiple vias for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX1, LX2 (Pins 18–19, 1–2) | Power switch node | Connects directly to inductor high-side terminal; carries high di/dt switching current-requires short, low-inductance routing. |
| PGND1, PGND2 (Pins 20–21, 22–23) | Power ground return | Separate low-impedance return paths for each channel's power stage-must tie to exposed pad and avoid mixing with SGND. |
| VIN1, VIN2 (Pins 16–17, 2–3) | Main input supply | Each channel accepts independent 2.85–6V input; requires local 22µF ceramic decoupling per channel at pin. |
| EN1, EN2 (Pins 13, 4) | Channel enable control | Logic-level inputs (1.5V HI, 0.4V LO) enabling independent power sequencing and controlled shutdown with soft-discharge. |
| PG1, PG2 (Pins 11, 5) | Power-good status | Open-drain outputs with 1ms delay-assert high after VOUT reaches 92% of target, signaling safe system boot. |
| FB1, FB2 (Pins 9, 6) | Output voltage feedback | Inverting inputs to error amplifiers; connected to resistor divider from VOUT to GND to set output voltage precisely. |
| ISET (Pin 14) | Current limit configuration | Configures peak current limit (2.7–5.5A per channel) by connecting to VDD, GND, or floating-enables flexible overload handling. |
| SYNC (Pin 12) | Frequency synchronization | Accepts external clock up to 6MHz (ISL8033 only); ISL8033AIRZ-T ignores SYNC-fixed 2.5MHz operation. |
| VDD (Pin 15) | Internal logic supply | Must be tied to VIN; powers internal bias circuitry, bandgap, and control logic-no external bypass required. |
| SGND (Pin 10) | Signal ground reference | Single-point connection point for FB/PG/EN signals-must tie to PGND at one location only to avoid ground loops. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck regulation | Integrated 50mΩ P- and N-MOSFETs per channel eliminate external power switches and reduce BOM count by ≥6 components. |
| 2.5MHz fixed switching frequency | Enables <1µH inductors and compact 2×22µF ceramic output caps-reduces total solution area to <5.46cm². |
| 180° out-of-phase operation | Cuts input ripple current amplitude by ~30% vs. in-phase dual converters-lowers RMS stress on input capacitors and EMI filter size. |
| Independent soft-start and soft-stop | 1.5ms controlled voltage ramp prevents inrush; internal 100Ω discharge FET safely collapses VOUT during shutdown without external circuitry. |
| Pre-biased output startup | Allows safe turn-on when output is already biased (e.g., back-fed from another rail)-eliminates reverse-current risk during sequencing. |
| 100% duty-cycle operation | Maintains regulation down to VIN − (IOUT × RDS(ON)) dropout-extends usable battery life in Li-ion systems nearing end-of-discharge. |
Applications
| FPGA Core & I/O Power | µP/MCU Dual-Rail Supply |
|---|---|
Use Scenario: Powering Xilinx Artix-7 FPGA with separate 1.2V core and 1.8V I/O rails from a single 5V intermediate bus. IC Role / Device Role / Timing Role: Dual-channel DC/DC converter providing tightly regulated, sequenced, and monitored low-voltage supplies. Use Value: Eliminates need for two discrete regulators; 180° phasing reduces input capacitor count by 30%; PG1/PG2 enable FPGA configuration lockstep. |
Use Scenario: Supplying ARM Cortex-M7 MCU with 1.1V core and 3.3V peripheral rail in industrial edge sensor node. IC Role / Device Role / Timing Role: Single-package dual buck regulator delivering independent, enable-controlled power domains. Use Value: Independent EN1/EN2 pins allow dynamic core/peripheral power gating; 8µA shutdown current extends battery life in sleep mode. |
| Li-ion–Powered Test Equipment | Compact DC/DC POL Module |
Use Scenario: Portable oscilloscope front-end powered by 3.7V Li-ion cell requiring stable 1.5V analog and 2.5V ADC rails. IC Role / Device Role / Timing Role: High-efficiency dual buck regulator operating across full battery voltage range (3.0–4.2V). Use Value: 100% duty cycle maintains regulation down to 3.0V input; 2.5MHz switching allows ultra-compact layout with 0.68µH inductors. |
Use Scenario: Embedded networking module requiring 1.8V/3A and 3.3V/3A from 5V backplane with minimal board area. IC Role / Device Role / Timing Role: Dual-output POL regulator integrated into compact 4×4mm footprint with thermal pad for conduction cooling. Use Value: Complete dual-channel solution occupies <5.46cm²; exposed pad + multiple vias enables >2W continuous power dissipation. |
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 |
|---|---|---|---|
| ISL8033IRZ-T | 1MHz fixed switching frequency; supports external SYNC up to 6MHz; identical pinout and feature set except frequency and SYNC behavior. | Better suited for noise-sensitive audio or RF subsystems where lower switching frequency eases EMI filtering; requires larger inductors (1.5µH vs. 0.68µH). | Select ISL8033IRZ-T when board area is less critical than EMI compliance or when external clock synchronization is required. |
| TPS65270RGET | 2.2MHz switching; integrated LDO for auxiliary rail; different pinout; no ISET programmability; higher quiescent current (120µA). | Provides third 3.3V LDO output ideal for mixed-signal SoC biasing; lacks independent soft-stop discharge and pre-bias startup. | Choose TPS65270RGET when a third regulated rail is needed and LDO integration outweighs loss of soft-discharge control. |
Compared with ISL8033IRZ-T, ISL8033AIRZ-T trades SYNC flexibility and lower EMI for 2.5× higher frequency and smaller magnetics; versus TPS65270RGET, it offers superior discharge control and lower IQ but no integrated LDO-making it optimal for space-constrained dual-rail systems prioritizing thermal performance and sequencing fidelity.
Availability
ISL8033AIRZ-T is available at Aetrix Electronics and suitable for FPGA power delivery, portable test equipment, and compact DC/DC POL modules requiring stable component supply, RoHS-compliant packaging, and long-term industrial temperature support (–40°C to +85°C).
Supply support for ISL8033AIRZ-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 acquired Intersil in 2017 and continues to manufacture and support its high-performance analog and power management portfolio, including precision DC/DC regulators for demanding embedded applications.
The ISL8033AIRZ-T belongs to Renesas' low-quiescent-current synchronous buck regulator family, engineered specifically for space- and efficiency-critical battery-powered and point-of-load systems requiring dual independent outputs.
FAQ
What is the switching frequency of the ISL8033AIRZ-T?
The ISL8033AIRZ-T operates at a fixed 2.5MHz switching frequency, as specified in Table 3 of the FN6854 datasheet. This frequency is factory-trimmed and non-adjustable-unlike the ISL8033IRZ-T, the ISL8033AIRZ-T ignores the SYNC pin and does not support external synchronization. The 2.5MHz operation enables use of smaller inductors (e.g., 0.47–1.5µH) and reduces output capacitor requirements for compact POL designs.
Does the ISL8033AIRZ-T support pre-biased output startup?
Yes, the ISL8033AIRZ-T supports pre-biased output startup, as confirmed in the "Theory of Operation" section (page 15) of the FN6854 datasheet. During startup, the IC avoids sinking current even in PWM mode, preventing reverse current flow when the output is already biased above the target regulation voltage-critical for safe power sequencing in multi-rail systems where rails may be powered in arbitrary order.
How is output voltage programmed on the ISL8033AIRZ-T?
Output voltage is programmed using external resistor dividers connected to FB1 and FB2 pins. The internal 0.800V reference is compared against the divided output voltage; for example, a 1.8V output requires R2 = 124kΩ and R3 = 100kΩ (per Table 2). The error amplifier's transconductance (20µA/V) and internal 27pF/390kΩ compensation network ensure stability across the supported output range (0.8V to 3.3V) without additional external components.
What thermal performance can be expected from the ISL8033AIRZ-T?
The ISL8033AIRZ-T has a junction-to-case thermal resistance (θJC) of 2°C/W and junction-to-ambient (θJA) of 36°C/W in the 4×4mm QFN package. With the exposed thermal pad (Pin 25) properly connected to a large PGND copper area via ≥6 thermal vias, the device sustains 2W continuous power dissipation at +85°C ambient. Thermal shutdown activates at +150°C with +25°C hysteresis, ensuring reliable recovery under transient overload.
Can the ISL8033AIRZ-T operate with a single Li-ion cell?
Yes, the ISL8033AIRZ-T supports input voltages from 2.85V to 6V, making it fully compatible with single Li-ion cells (nominal 3.7V, range 3.0–4.2V). Its 100% duty-cycle capability ensures regulation is maintained even as the cell discharges below 3.0V-dropout voltage equals IOUT × RDS(ON)P, e.g., 3A × 70mΩ = 210mV at 2.85V input-enabling extended runtime in portable applications.
ISL8033AIRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-VFQFN 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):
- 2.85V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 3A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
ISL8033AIRZ-T FAQ
1.How can I place an order for ISL8033AIRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8033AIRZ-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 ISL8033AIRZ-T reliable?
The price and inventory of ISL8033AIRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8033AIRZ-T is usually 5 days.
3.What payment methods are accepted for ISL8033AIRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8033AIRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8033AIRZ-T?
ISL8033AIRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8033AIRZ-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 ISL8033AIRZ-T?
For technical support, including ISL8033AIRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8033AIRZ-T requirements.
6.How does Aetrix verify that ISL8033AIRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL8033AIRZ-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 ISL8033AIRZ-T meets industry standards.
7.What is the process for return or replacement of ISL8033AIRZ-T?
All ISL8033AIRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL8033AIRZ-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 ISL8033AIRZ-T part is unused and in its original packaging.
Return procedure for ISL8033AIRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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