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Analog Devices Inc./Maxim Integrated MAX17233ETIS+T
- Part No.:
- MAX17233ETIS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX17233ETIS+T.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,696
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Product details
Overview
MAX17233ETIS+T from Maxim Integrated is a dual synchronous step-down DC-DC controller with integrated gate drivers, operating from 3.5V to 36V input and delivering independently regulated 5V/3.3V or adjustable 1V–10V outputs. It features 2.2MHz PWM/PSM operation, 95% max duty cycle for dropout support, ±1% fixed-output accuracy, and 20µA quiescent current in PFM mode - enabling compact, high-efficiency point-of-load regulation in industrial power supplies.
For engineers reviewing the MAX17233ETIS+T datasheet, MAX17233ETIS+T pinout, MAX17233ETIS+T application, or MAX17233ETIS+T equivalent, key selection considerations include its dual-buck interleaved architecture, 180° phase shift for ripple reduction, spread-spectrum EMI control, EXTVCC switchover capability, and thermal shutdown with 170°C trip point.
Technical Context
The MAX17233ETIS+T implements two independent current-mode-controlled buck regulators with programmable 1–2.2MHz switching frequency via external resistor on FOSC and synchronization support via FSYNC. Each channel uses dedicated DH_/DL_ gate drivers with shoot-through protection, BST_-based high-side drive, and DCR/resistor-based current sensing.
It integrates a 5V BIAS LDO (6.8µF bypassed), supports EXTVCC switchover for reduced dissipation, and delivers precise output regulation via 1.0V feedback reference (±1% at FB pins) with soft-start (6ms typical), power-good monitoring (PGOOD1/PGOOD2), and 42V transient input protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V continuous; withstands 42V transients - enables direct connection to 24V industrial rails and automotive battery inputs. |
| Switching Frequency | 1MHz to 2.2MHz (adjustable via FOSC resistor); ±6% spread-spectrum enabled - reduces EMI peak emissions without external filtering. |
| Output Voltage Options | Fixed 5V (Buck 1) and 3.3V (Buck 2) with ±1% accuracy; or 1V–10V adjustable via resistive divider - supports mixed-voltage SoC/FPGA power domains. |
| Quiescent Current | 20µA typical in PFM mode (both channels active); 8µA in shutdown - extends battery life in always-on systems. |
| Thermal Protection | Thermal shutdown at +170°C with 20°C hysteresis - ensures safe operation under sustained overload or poor heatsinking. |
| Phase Relationship | 180° out-of-phase operation between Buck 1 and Buck 2 - halves input ripple current and simplifies input capacitor sizing. |
| Feedback Reference | 1.000V ±1% at FB1/FB2 pins - enables stable regulation across temperature and line variations without trimming. |
Pinout & Package
MAX17233ETIS+T is housed in a 28-pin 5mm × 5mm TQFN-EP package with exposed thermal pad (EP), rated for –40°C to +85°C ambient operation. The exposed pad must be soldered to a PCB ground plane for optimal thermal performance (θJC = 3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX1, LX2 | Switch-node connections for Buck 1 and Buck 2 | High dv/dt nodes requiring short, low-inductance routing to inductors; serve as return rails for DH1/DH2 gate drives. |
| DH1, DH2 | High-side nMOSFET gate drivers | Bootstrap-powered (BST1/BST2) outputs swinging from LX_ to VBST_; require external diode + ceramic capacitor for charge replenishment. |
| DL1, DL2 | Low-side nMOSFET gate drivers | BIAS-supplied outputs swinging from PGND_ to VBIAS; include shoot-through protection and require gate pulldown resistors during shutdown. |
| FB1, FB2 | Feedback inputs for output voltage regulation | Reference points for 1.000V internal error amplifier; connect to BIAS for fixed outputs or to resistive dividers for adjustable 1V–10V range. |
| CS1, CS2 | Positive current-sense inputs | Monitor high-side current via external sense resistor or DCR; trigger cycle-by-cycle current limit at 64–96mV threshold. |
| PGOOD1, PGOOD2 | Open-drain power-good status outputs | Assert low during soft-start, undervoltage, or overvoltage faults; require external pull-up (≥100Ω) to logic rail ≤5.5V. |
| EN1, EN2 | High-voltage tolerant enable inputs | Active-high digital controls (–0.3V to +42V rating); allow independent sequencing of each buck converter. |
| FSYNC | External clock synchronization input | Accepts 1.2–2.4MHz square wave (50% duty); resets internal oscillator on rising edge - enables multi-phase coherence. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor solution | Enables ultra-compact layout with no electrolytic or tantalum capacitors required on input/output - improves reliability and lifetime. |
| 180° interleaved operation | Reduces total input RMS ripple current by ~70% vs. parallel non-interleaved converters - cuts input capacitor size and cost. |
| Spread-spectrum modulation | ±6% dithering of switching frequency lowers peak EMI by >10dB - simplifies compliance with CISPR 22/32 Class B limits. |
| EXTVCC switchover | Automatically disables internal BIAS LDO when external 3.1–5.2V supply is applied - reduces thermal load and improves light-load efficiency. |
| 50ns minimum on-time | Supports high-frequency operation (2.2MHz) down to 2.3% duty cycle (e.g., 5V→115V conversion) - enables wide VIN/VOUT ratios. |
Applications
| Industrial PLC Power Distribution | FPGA Core & I/O Rail Sequencing |
|---|---|
Use Scenario: Distributed 24V-to-5V/3.3V conversion across modular I/O backplanes with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Dual-buck controller providing isolated, sequenced, and monitored power rails for analog front-ends and digital logic blocks. Use Value: 180° phase shift minimizes input capacitor stress; PGOOD outputs feed FPGA configuration logic for safe boot sequencing. |
Use Scenario: Simultaneous generation of core (1.0V) and auxiliary (3.3V) rails for Xilinx Artix-7 FPGA with tight voltage tolerance and fast transient response. IC Role / Device Role / Timing Role: Adjustable dual-output controller supporting custom feedback dividers and independent EN1/EN2 sequencing per rail. Use Value: 20µA PFM quiescent current extends sleep-mode battery life; 50ns min on-time enables 1.0V @ 2.2MHz operation from 12V input. |
| Automotive Body Control Module (BCM) | Medical Point-of-Load Regulation |
Use Scenario: 12V battery-fed power system supplying 5V microcontroller domain and 3.3V CAN transceiver rail in harsh automotive environments. IC Role / Device Role / Timing Role: Robust dual-buck controller with 42V transient protection, thermal shutdown, and UVLO on BIAS/EXTVCC inputs. Use Value: EXTVCC switchover allows using 5V rail to power internal circuitry - eliminates BIAS LDO self-heating during extended cold-crank conditions. |
Use Scenario: Low-noise, low-power supply for portable ultrasound front-end ASICs requiring clean 3.3V and 1.8V rails with medical-grade reliability. IC Role / Device Role / Timing Role: Dual synchronous buck controller with spread-spectrum EMI reduction and <1% output regulation accuracy. Use Value: Spread-spectrum operation suppresses narrowband noise peaks that could interfere with sensitive analog signal chains; PGOOD asserts only after full soft-start completion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17232ETIS+T | Lower 200kHz–1MHz frequency range; no spread-spectrum; same pinout and feature set except FOSC range and EMI control. | Better suited for high-efficiency, low-noise applications where board space permits larger magnetics. | Select MAX17232ETIS+T when EMI requirements are less stringent and lower switching losses are prioritized over component miniaturization. |
| MP2491DS-LF-Z | Single-channel 3.5–36V buck controller (no dual output); 200kHz–2.2MHz adjustable; lacks PGOOD, spread-spectrum, and EXTVCC switchover. | Requires two ICs to replicate dual-rail functionality; higher BOM count and layout complexity. | Choose MP2491DS-LF-Z only if single-rail design suffices or when sourcing constraints favor Monolithic Power Systems' distribution network. |
Compared with MAX17232ETIS+T, the MAX17233ETIS+T offers higher-frequency operation and built-in spread-spectrum EMI reduction - critical for space-constrained, noise-sensitive designs. Versus MP2491DS-LF-Z, it delivers true dual-rail integration with coordinated timing, fault monitoring, and thermal management in one package.
Availability
MAX17233ETIS+T is available at Aetrix Electronics and suitable for industrial PLC power distribution, FPGA core/I/O rail sequencing, automotive body control modules, and medical point-of-load regulation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MAX17233ETIS+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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management solutions for industrial, automotive, and communications markets.
The MAX17232/MAX17233 product line was designed to deliver highly integrated, dual-output DC-DC controllers with ultra-low quiescent current, robust protection features, and EMI-optimized operation for next-generation embedded power systems.
FAQ
What is the maximum input voltage transient rating for MAX17233ETIS+T?
The MAX17233ETIS+T supports 42V input voltage transients for up to 1 second, protecting against load-dump events in automotive and industrial 24V systems. This rating is specified in Absolute Maximum Ratings and applies regardless of steady-state VIN, ensuring reliable operation during voltage spikes without external clamping.
Can MAX17233ETIS+T operate with only one buck channel enabled?
Yes, MAX17233ETIS+T supports independent channel control: EN1 enables Buck 1 and EN2 enables Buck 2. Either can be held low while the other operates normally. When only Buck 2 is active in skip mode, quiescent current drops to 20µA typical; with both disabled, it falls to 8µA typical - ideal for partial-system sleep modes.
Does MAX17233ETIS+T require external MOSFETs, and what gate-drive capability does it provide?
Yes, MAX17233ETIS+T is a controller (not an integrated power stage) and requires external high-side and low-side nMOSFETs. It provides dedicated DH_/DL_ gate drivers: DH1/DH2 swing from LX_ to VBST_ (with bootstrap diode/capacitor), DL1/DL2 swing from PGND_ to VBIAS (5V), with shoot-through protection and typical 2–4Ω pulldown resistance.
How does the spread-spectrum function work on MAX17233ETIS+T, and when is it active?
MAX17233ETIS+T performs ±6% dithering of its internal switching frequency to reduce peak EMI emissions. Spread-spectrum is enabled by default in free-running mode but is automatically disabled when FSYNC is driven by an external clock - preserving synchronization integrity while allowing EMI optimization in standalone operation.
What is the purpose of the EXTVCC pin on MAX17233ETIS+T, and how does it affect efficiency?
The EXTVCC pin on MAX17233ETIS+T accepts an external 3.1–5.2V supply to bypass the internal 5V BIAS LDO. When active, the BIAS regulator shuts down, eliminating its dropout loss and reducing total power dissipation - particularly beneficial at light loads or high ambient temperatures where LDO self-heating would otherwise degrade efficiency.
MAX17233ETIS+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V, 5V
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- 1MHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TQFN (4x4)
MAX17233ETIS+T FAQ
1.How can I place an order for MAX17233ETIS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17233ETIS+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 MAX17233ETIS+T reliable?
The price and inventory of MAX17233ETIS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17233ETIS+T is usually 5 days.
3.What payment methods are accepted for MAX17233ETIS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17233ETIS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17233ETIS+T?
MAX17233ETIS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17233ETIS+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 MAX17233ETIS+T?
For technical support, including MAX17233ETIS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17233ETIS+T requirements.
6.How does Aetrix verify that MAX17233ETIS+T is sourced from the original manufacturer or authorized distributors?
All MAX17233ETIS+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 MAX17233ETIS+T meets industry standards.
7.What is the process for return or replacement of MAX17233ETIS+T?
All MAX17233ETIS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17233ETIS+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 MAX17233ETIS+T part is unused and in its original packaging.
Return procedure for MAX17233ETIS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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