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Renesas ISL8033IRZ-T7A
- Part No.:
- ISL8033IRZ-T7A
- Manufacturer:
- Renesas
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ISL8033IRZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:217
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Product details
Overview
ISL8033IRZ-T7A from Renesas (formerly Intersil) is a dual-channel synchronous buck regulator IC delivering up to 3A per channel at 1MHz fixed switching frequency, optimized for low-voltage POL applications down to 0.8V output. It integrates P- and N-channel MOSFETs with 50mΩ typical RDS(on), supports 2.85V–6V input, and features independent enable, power-good, and soft-discharge functions. It is widely used in FPGA and microprocessor core voltage regulation.
For engineers reviewing the ISL8033IRZ-T7A datasheet, ISL8033IRZ-T7A pinout, ISL8033IRZ-T7A application, or ISL8033IRZ-T7A equivalent, key selection considerations include its 180° out-of-phase dual-channel operation for EMI reduction, 2% output voltage accuracy over load/line/temperature, 8µA shutdown current, internal digital soft-start (1.5ms), and 100% duty-cycle capability for ultra-low dropout.
Technical Context
The ISL8033IRZ-T7A implements current-mode PWM control with internal slope compensation and transconductance error amplifiers (20µA/V gain, 0.2Ω trans-resistance). Each channel uses dedicated current-sense amplifiers (CSA1/CSA2) with 0.20V/A gain to monitor P-MOSFET conduction and enforce peak current limiting.
It operates with fixed 1MHz switching frequency (non-synchronizable), 180° phase shift between channels to minimize input RMS current ripple, and includes independent 1ms power-good timers, thermal shutdown at 150°C (25°C hysteresis), and hiccup-mode short-circuit protection triggered after 17 consecutive overcurrent events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current per Channel | 3A guaranteed minimum with ISET tied to VDD; enables robust core rail delivery for µP/FPGA loads. |
| Input Voltage Range | 2.85V to 6V - supports single Li+ cell, three NiMH cells, or regulated 5V supply without external LDO pre-regulation. |
| Output Voltage Range | 0.8V to 3.3V - programmable via external resistor divider; 0.8V reference enables modern low-voltage logic rails. |
| Switching Frequency | 1MHz fixed - balances efficiency, component size, and EMI; no external sync required for basic operation. |
| Efficiency | Up to 95% at 3A (e.g., 1.8V/3A @ 5VIN) - high efficiency reduces thermal load in space-constrained PCB layouts. |
| Quiescent Supply Current | 15–40mA typical - low operating current extends battery life in portable systems during active use. |
| Shutdown Current | 8µA max - ultra-low leakage enables long-term standby in always-on embedded devices. |
Pinout & Package
ISL8033IRZ-T7A is housed in a thermally enhanced 24-lead 4mm × 4mm QFN package (L24.4x4D) with exposed thermal pad (PD) requiring connection to PGND for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX1, LX2 | Switch node outputs | Connect directly to inductor terminals; high dv/dt nodes requiring tight layout and ground shielding. |
| PGND1, PGND2, PGND | Power ground returns | Dedicated low-impedance paths for each channel's power stage; must be star-connected to exposed pad. |
| FB1, FB2 | Feedback inputs | Monitor output voltage via resistor divider; internal 0.8V reference enables precise regulation from 0.8V. |
| EN1, EN2 | Independent enable inputs | Logic-level control (1.5V HI / 0.4V LO) for sequencing; drives output into soft-discharge mode when pulled low. |
| PG1, PG2 | Power-good open-drain outputs | 1ms delayed assertion confirms stable regulation; used for system reset or downstream enable coordination. |
| ISET | Current limit configuration | Three-state setting (VDD/GND/floating) selects peak overload current: 4.8A, 3.3A, or 4.8A respectively. |
| VIN1, VIN2, VDD | Input power and logic supply | VIN pins accept 2.85–6V; VDD ties to VIN and powers internal logic-requires local 22µF ceramic decoupling. |
| SGND | System ground reference | Single-point tie to PGND; separates analog sensing from noisy power return paths. |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase dual-channel operation | Reduces input capacitor RMS current by ~30% and lowers conducted EMI peaks compared to in-phase converters. |
| Internal digital soft-start (1.5ms) | Prevents inrush current and output overshoot during power-up; eliminates need for external timing components. |
| 100% duty-cycle capability | Enables <250mV dropout at 3A (RDS(on) × IOUT), extending usable battery range in Li+ systems. |
| Independent soft-stop output discharge | Activates 100Ω internal pull-down on disable, safely discharging output caps without external circuitry. |
| Peak current limiting + hiccup protection | Detects overloads via CSA amplifier; enters safe restart cycle after 17 faults-prevents thermal runaway. |
| Negative current protection | Shuts down and discharges output if reverse current exceeds –2.5A, protecting against back-driving or hot-swap transients. |
Applications
| FPGA Core Power Supply | Microprocessor I/O Rail Regulation |
|---|---|
|
Use Scenario: Providing tightly regulated 1.2V/1.8V core and I/O supplies to Xilinx Artix-7 or Intel Cyclone V FPGAs in compact industrial controllers. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator delivering independent, sequenced 3A outputs with 2% accuracy and 1ms PG assertion. Use Value: Eliminates need for two discrete regulators; 180° phase shift cuts input capacitance requirements by 40% versus single-channel solutions. |
Use Scenario: Generating 1.8V and 3.3V rails for ARM Cortex-A9-based SoMs in medical handheld devices powered by single-cell Li+. IC Role / Device Role / Timing Role: Dual POL regulator supporting dynamic voltage scaling and independent enable control for power domain isolation. Use Value: 8µA shutdown current and 100% duty-cycle operation extend battery runtime beyond 12 hours in sleep mode. |
| DC/DC Plug-in Module for Networking Gear | Li-ion Battery-Powered Test Equipment |
|
Use Scenario: Embedded in hot-pluggable 12V-to-1.2V/1.8V DC/DC modules for enterprise routers, where board area and thermal density are constrained. IC Role / Device Role / Timing Role: High-efficiency dual buck controller enabling >93% efficiency at full load with minimal external components (2×22µF output caps, 1.5µH inductors). Use Value: 4×4mm QFN footprint and integrated MOSFETs reduce total solution area to <5.46cm² - 35% smaller than discrete alternatives. |
Use Scenario: Powering precision ADCs and op-amp signal chains in portable oscilloscope front-ends running off 3.7V Li-ion cells. IC Role / Device Role / Timing Role: Low-noise, high-PSRR dual regulator supplying clean analog and digital rails with independent PG monitoring. Use Value: Internal compensation and 0.8V reference ensure stable 1.8V/3.3V outputs across temperature (-40°C to +85°C) without tuning. |
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 |
|---|---|---|---|
| ISL8033AIRZ-T7A | Fixed 2.5MHz switching frequency; requires smaller inductors (0.47–1.5µH) and same 2×22µF output caps. | Better suited for ultra-compact designs where PCB area is critical; higher frequency increases light-load switching losses. | Select ISL8033AIRZ-T7A when minimizing footprint outweighs efficiency trade-offs at light loads. |
| TPS65270PWP | 2.25MHz fixed frequency; dual 3A outputs; integrated LDO for auxiliary rail; no ISET current-limit adjustment. | Includes 300mA LDO for bias rails; lacks independent soft-discharge and negative current protection. | Choose TPS65270PWP when auxiliary LDO integration simplifies BOM, and hiccup-mode OCP suffices for system safety. |
Compared with ISL8033IRZ-T7A, the ISL8033AIRZ-T7A trades lower light-load efficiency for significantly reduced magnetics size, while the TPS65270PWP adds system-level integration at the cost of missing key protections like negative current detection and configurable soft-stop discharge.
Availability
ISL8033IRZ-T7A is available at Aetrix Electronics and suitable for FPGA power delivery, microprocessor I/O regulation, and Li-ion-powered test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL8033IRZ-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 technical and manufacturing continuity for the ISL8033 family of high-efficiency power management ICs.
The ISL8033IRZ-T7A belongs to Renesas' high-density POL regulator product line, designed specifically for space-constrained, battery-sensitive applications demanding dual-rail flexibility, low quiescent current, and robust fault handling.
FAQ
What is the maximum output voltage supported by the ISL8033IRZ-T7A?
The ISL8033IRZ-T7A supports output voltages from 0.8V up to 3.3V, set by an external resistor divider connected to FB1 or FB2. The internal 0.8V reference and ±2% regulation accuracy over temperature/load/line ensure reliable operation across this range. Higher outputs are not supported due to internal error amplifier headroom limits.
Does the ISL8033IRZ-T7A support external clock synchronization?
No, the ISL8033IRZ-T7A does not support external synchronization. Its switching frequency is fixed at 1MHz. Only the ISL8033A variant (e.g., ISL8033AIRZ-T7A) supports external sync up to 6MHz. The SYNC pin on ISL8033IRZ-T7A must be tied to VIN or left unconnected per datasheet guidance.
How does the ISET pin affect current limiting on the ISL8033IRZ-T7A?
The ISET pin configures peak current limit thresholds: tying ISET to VDD sets ±4.8A, to GND sets ±3.3A, and leaving it floating also yields ±4.8A. These values correspond to the positive and negative overcurrent protection trip points, directly impacting short-circuit response and inductor saturation margin selection for the ISL8033IRZ-T7A.
Can the ISL8033IRZ-T7A operate with a 2.5V input supply?
No - the ISL8033IRZ-T7A has a minimum input voltage of 2.85V (with 50mV hysteresis). At 2.5V, the device remains in undervoltage lockout (UVLO) and will not switch. Valid inputs span 2.85V to 6V, making it compatible with single Li+ (3.0–4.2V), three NiMH (3.6V), or regulated 5V sources.
What thermal performance can be expected from the ISL8033IRZ-T7A in a 4-layer PCB design?
In a standard 4-layer board with 2oz copper, 6 thermal vias under the exposed pad, and 1in² of 2oz copper pour connected to PGND, the ISL8033IRZ-T7A achieves θJA ≈ 36°C/W. At 3A per channel and 5VIN→1.8VOUT, power dissipation is ~0.6W, resulting in ~22°C junction rise above ambient - well within the –40°C to +125°C operating range.
ISL8033IRZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-T7A FAQ
1.How can I place an order for ISL8033IRZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8033IRZ-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 ISL8033IRZ-T7A reliable?
The price and inventory of ISL8033IRZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8033IRZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL8033IRZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8033IRZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8033IRZ-T7A?
ISL8033IRZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8033IRZ-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 ISL8033IRZ-T7A?
For technical support, including ISL8033IRZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8033IRZ-T7A requirements.
6.How does Aetrix verify that ISL8033IRZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL8033IRZ-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 ISL8033IRZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL8033IRZ-T7A?
All ISL8033IRZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL8033IRZ-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 ISL8033IRZ-T7A part is unused and in its original packaging.
Return procedure for ISL8033IRZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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