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Renesas ISL85033IRTZ-T
- Part No.:
- ISL85033IRTZ-T
- Manufacturer:
- Renesas
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
ISL85033IRTZ-T.pdf
- Description:
- IC REG BUCK ADJ 3A SGL/DL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,707
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Product details
Overview
ISL85033IRTZ-T from Renesas Electronics is a dual-channel synchronous buck regulator IC with integrated 3A-per-channel N-Channel MOSFETs, operating from 4.5V to 28V input and delivering adjustable output voltages down to 0.8V. It uses peak current-mode control, supports 300kHz–2MHz programmable switching frequency, and features independent power-good signals, soft-start, and thermal/overcurrent/UVLO protection. It powers FPGA core logic, STB main rails, and LCD panel supplies.
For engineers reviewing the ISL85033IRTZ-T datasheet, ISL85033IRTZ-T pinout, ISL85033IRTZ-T application, or ISL85033IRTZ-T equivalent, key selection criteria include dual 3A continuous output capability, TQFN-28 package thermal performance, in-phase/out-of-phase PWM synchronization, independent tracking modes, and external Schottky diode requirement for each channel.
Technical Context
The ISL85033IRTZ-T integrates two independent peak current-mode buck controllers, each driving an internal high-side N-MOSFET (75–150mΩ RDS(on)) with external bootstrap circuitry and requiring an external Schottky diode for low-side conduction. Its dual-phase architecture supports in-phase (0°) or out-of-phase (180°) operation via SYNCIN logic level or external clock.
It implements independent soft-start (2ms internal default), independent enable inputs (EN1/EN2), and independent power-good outputs (PGOOD1/PGOOD2) with 91–94% rising threshold. Protection includes cycle-by-cycle overcurrent detection (4.1–6.1A trip), thermal shutdown at +150°C, BOOT undervoltage detection, and UVLO on VIN1 with 3.9–4.4V rising threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports wide-input industrial, telecom, and consumer DC sources including 12V/24V rails and battery-backed systems. |
| Output Current per Channel | 3A continuous - enables dual-rail point-of-load conversion for FPGA I/O and core, STB SoC, or LCD bias supplies without external current sharing. |
| Switching Frequency | 300kHz to 2MHz - adjustable via FS pin resistor or external SYNCIN; higher frequencies reduce inductor size but increase switching loss. |
| Reference Voltage | 0.792V to 0.808V - tight 1% tolerance enables precise output regulation across temperature and load for sensitive digital loads. |
| Thermal Resistance θJA | 38°C/W - achieved in 4mm×4mm TQFN package with exposed pad soldered to SGND, enabling 3A/channel operation up to +85°C ambient. |
| Power-Good Threshold | Rising: 91–94% of VOUT - provides reliable system sequencing and fault indication without external monitoring circuitry. |
| Overcurrent Trip Level | 4.1A to 6.1A - cycle-by-cycle current limiting protects internal MOSFETs during overload or short-circuit conditions. |
Pinout & Package
The ISL85033IRTZ-T is housed in a 28-lead, 4mm × 4mm Thin Quad Flat No-Lead (TQFN) RoHS-compliant package with exposed thermal pad (PD) connected to SGND. The package supports high-density PCB layouts and efficient heat dissipation when the exposed pad is soldered with multiple vias to internal ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 / VIN2 | Input supply pins for channels 1 and 2 | Accept 4.5V–28V; require ≥10µF ceramic decoupling each, placed close to pins for stable gate drive and noise immunity. |
| PHASE1 / PHASE2 | Switch node outputs | Connect to inductor high-side and Schottky diode anode; voltage swings from near-GND to VIN during operation. |
| BOOT1 / BOOT2 | Bootstrap supply pins | Drive internal high-side MOSFET gates; require external capacitor (e.g., 0.1µF) between BOOTx and PHASEx. |
| FB1 / FB2 | Feedback inputs | Monitor output voltage via resistor divider; set VOUT = 0.8V × (1 + R1/R2); also used by PG and UVLO circuits. |
| EN1 / EN2 | Enable inputs | Active-high logic; enable when >2V; disable when pulled low; no internal debouncing - external filtering required for noisy environments. |
| PGOOD1 / PGOOD2 | Open-drain power-good outputs | Pull low during soft-start or if VOUT < 91% of target; internal 5MΩ pull-up enables direct MCU GPIO monitoring. |
| SYNCIN / SYNCOUT | Synchronization interface | SYNCIN accepts 300kHz–2MHz external clock (negative-edge triggered); SYNCOUT provides inverted copy for daisy-chaining. |
| FS | Frequency select | Tie to VCC for 500kHz default; connect resistor to GND to program 300kHz–2MHz range per datasheet table. |
| SS1 / SS2 | Soft-start timing | Capacitor-to-ground sets ramp rate; tie to VCC for fixed 2ms internal soft-start; max 100nF recommended. |
| SGND | Signal ground reference | All analog references (FB, COMP, REF) referenced here; must be tied to exposed pad and isolated from noisy PGND planes where possible. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulators | Enables separate voltage rails (e.g., 5V + 3.3V) with independent sequencing, soft-start, and fault reporting - eliminates need for two discrete converters. |
| Selectable phase relationship | SYNCIN logic level configures 0° (in-phase) or 180° (out-of-phase) operation - reduces input ripple current and eases EMI filter design in shared input bus applications. |
| Independent tracking modes | Supports absolute, ratiometric, sequential, or independent startup - critical for multi-rail FPGAs and processors requiring strict power-up order. |
| Integrated 5V LDO (VCC) | Provides internal bias for control circuitry; rated for ≤10mA load - eliminates need for external bias rail while simplifying BOM. |
| Peak current-mode control | Improves line transient response and simplifies loop compensation vs. voltage-mode; allows flexible inductor/capacitor selection without stability trade-offs. |
Applications
| FPGA Core & I/O Power | Set-Top Box Main Rails |
|---|---|
Use Scenario: Powering Xilinx Artix-7 or Intel Cyclone V FPGA with separate 1.2V core and 3.3V I/O rails. IC Role / Device Role / Timing Role: Dual-channel buck regulator providing tightly regulated, sequenced, and monitored DC supplies. Use Value: Eliminates discrete converter count; meets FPGA VCCINT/VCCIO sequencing requirements via SS1/SS2 and tracking modes. | Use Scenario: Generating 5V and 3.3V rails for STB SoC, tuner, and HDMI interface in cable/satellite receivers. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering stable, low-noise power under dynamic video/audio load transients. Use Value: 3A/channel headroom handles burst loads from demodulation and decoding; PGOOD signals enable safe system reset sequencing. |
| LCD Panel Bias Supplies | HDD/DVD Drive Power |
Use Scenario: Supplying AVDD (12V), VGH (18V), and VGL (–7V) bias rails for TFT-LCD panels using charge-pump assist. IC Role / Device Role / Timing Role: High-efficiency dual buck stage feeding downstream charge pumps or linear post-regulators. Use Value: Wide 4.5–28V input accommodates varying adapter voltages; 2MHz capability minimizes inductor size for space-constrained display modules. | Use Scenario: Providing 5V and 12V rails for 2.5" HDD spindle motor and logic, or DVD servo/control circuitry. IC Role / Device Role / Timing Role: Robust point-of-load regulator handling high inrush currents during spin-up and seek operations. Use Value: Overcurrent protection (4.1–6.1A) prevents latch-up during motor stall; thermal shutdown ensures reliability under sustained mechanical load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4433AGL-A-P | Monolithic dual 3A buck with integrated high-/low-side MOSFETs; no external diode required; fixed 500kHz frequency only. | Better suited for space-constrained designs where external diode placement is impractical; lacks SYNCIN/FS programmability. | Choose MPQ4433AGL-A-P when board area is critical and fixed frequency suffices; avoid if synchronization or frequency tuning is needed. |
| TPS544B25RTER | Single-channel 4A buck with PMBus interface; requires external controller for dual-rail operation; supports telemetry and dynamic voltage scaling. | Targeted at server/industrial applications needing digital control and telemetry; not a drop-in replacement due to single-channel architecture. | Choose TPS544B25RTER when digital monitoring, margining, or adaptive voltage scaling is required; use only with companion controller for dual-rail support. |
Compared with MPQ4433AGL-A-P and TPS544B25RTER, the ISL85033IRTZ-T uniquely balances dual-channel integration, external diode flexibility for efficiency optimization, full frequency programmability, and hardware-based sequencing-making it optimal for cost-sensitive, high-reliability consumer and embedded systems without digital control needs.
Availability
ISL85033IRTZ-T is available at Aetrix Electronics and suitable for FPGA power delivery, set-top box main rails, and LCD panel bias supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL85033IRTZ-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 management, and timing solutions for automotive, industrial, and consumer markets.
The ISL85033IRTZ-T belongs to Renesas' ISL85xx family of wide-input buck regulators designed for high-efficiency, compact point-of-load conversion in space- and thermal-constrained embedded systems.
FAQ
What is the maximum continuous output current per channel for the ISL85033IRTZ-T?
The ISL85033IRTZ-T delivers 3A continuous output current per channel under recommended operating conditions (TA ≤ +85°C, proper PCB layout, and thermal management). This rating assumes use of external Schottky diodes and appropriate output inductors/capacitors as specified in the datasheet application schematics.
Does the ISL85033IRTZ-T require external diodes, and why?
Yes, the ISL85033IRTZ-T requires external Schottky diodes for each channel because it integrates only the high-side N-Channel MOSFETs-not synchronous rectifiers. The external diode completes the buck power path during the low-side conduction phase, enabling cost-effective efficiency optimization and thermal separation from the IC die.
How is output voltage programmed on the ISL85033IRTZ-T?
Output voltage is programmed using an external resistor divider connected between VOUT, FBx, and GND. The ISL85033IRTZ-T regulates VOUT to maintain 0.8V at the FBx pin, so VOUT = 0.8V × (1 + Rtop/Rbottom). Typical values (e.g., 69.8kΩ/8.06kΩ) yield 5V; 42.2kΩ/8.06kΩ yields 3.3V.
Can the ISL85033IRTZ-T operate with independent input supplies for each channel?
Yes, the ISL85033IRTZ-T supports independent VIN1 and VIN2 inputs, allowing different source voltages (e.g., 12V for one channel, 24V for another) as long as both remain within 4.5V–28V. Each channel's control circuitry is powered from its respective VIN, enabling true dual-input operation in distributed power architectures.
What thermal derating applies to the ISL85033IRTZ-T at elevated ambient temperatures?
The ISL85033IRTZ-T is rated for –40°C to +85°C ambient operation. At +85°C, full 3A/channel output requires adherence to the thermal design guidelines: 4mm×4mm TQFN package with exposed pad soldered to SGND using ≥6 thermal vias, and minimum copper area per datasheet layout recommendations. Derating curves in Figure 27 of FN6676 show power dissipation limits versus ambient temperature.
ISL85033IRTZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1 or 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 3A
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TQFN (4x4)
ISL85033IRTZ-T FAQ
1.How can I place an order for ISL85033IRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85033IRTZ-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 ISL85033IRTZ-T reliable?
The price and inventory of ISL85033IRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85033IRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL85033IRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85033IRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85033IRTZ-T?
ISL85033IRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85033IRTZ-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 ISL85033IRTZ-T?
For technical support, including ISL85033IRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85033IRTZ-T requirements.
6.How does Aetrix verify that ISL85033IRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL85033IRTZ-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 ISL85033IRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL85033IRTZ-T?
All ISL85033IRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL85033IRTZ-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 ISL85033IRTZ-T part is unused and in its original packaging.
Return procedure for ISL85033IRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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