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Analog Devices Inc./Maxim Integrated MAX17233ETIR+
- Part No.:
- MAX17233ETIR+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX17233ETIR+.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,720
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Product details
Overview
MAX17233ETIR+ 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, 50ns minimum on-time, and 42V transient protection - deployed in industrial power supplies requiring compact, high-efficiency dual-rail regulation.
For engineers reviewing the MAX17233ETIR+ datasheet, MAX17233ETIR+ pinout, MAX17233ETIR+ application, or MAX17233ETIR+ equivalent, key selection criteria include dual-buck interleaving for ripple reduction, EXTVCC switchover for low-load efficiency, spread-spectrum EMI control, and validated 180° phase shift between channels.
Technical Context
The MAX17233ETIR+ implements current-mode PWM/PSM control with independent EN1/EN2 enables, 180° out-of-phase switching to minimize input ripple, and dual error amplifiers (COMP1/COMP2) supporting external RC compensation across its full 1V–10V output range. Its gate drivers (DH1/DL1/DH2/DL2) feature shoot-through protection and support external MOSFETs with programmable dead time (35ns/60ns).
It integrates a 5V BIAS LDO (6.8µF bypass required), supports EXTVCC switchover for reduced dissipation, and includes comprehensive protection: cycle-by-cycle current limiting via CS1/CS2, thermal shutdown at +170°C, input UVLO/OVLO, and PGOOD monitoring with 85–95% rising/falling thresholds.
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 or automotive battery inputs without pre-regulation. |
| Switching Frequency | 1MHz to 2.2MHz (adjustable via FOSC resistor); ±6% spread spectrum reduces peak EMI emissions at fundamental and harmonics. |
| Output Voltage Options | Fixed 5V (±1%) and 3.3V (±1%) or externally adjustable 1V–10V via FB1/FB2 resistive dividers - supports mixed-voltage SoC and FPGA power domains. |
| Quiescent Current | 20µA typical in PFM mode with one channel active; 8µA in shutdown - extends battery life in always-on systems. |
| Thermal Protection | Thermal shutdown at +170°C with 20°C hysteresis; junction-to-ambient θJA = 35°C/W (TQFN-EP) - ensures reliability under sustained 10A per channel loads. |
| Phase Relationship | 180° fixed phase shift between Buck 1 and Buck 2 - cuts input capacitor RMS current by ~30% and enables cascaded supply architectures. |
| Minimum On-Time | 50ns typical - supports high VIN/VOUT ratios (e.g., 24V→1.2V at 2.2MHz) without pulse-skipping instability. |
Pinout & Package
MAX17233ETIR+ is housed in a 28-pin 5mm × 5mm TQFN-EP package with exposed thermal pad (EP), rated for -40°C to +85°C operation. The exposed pad must be soldered to PCB ground for thermal performance and EMI control, while PGND1, PGND2, and AGND require separate low-impedance routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX1, LX2 | Switch-node connections for Buck 1 and Buck 2 | High-dV/dt nodes requiring tight layout to minimize EMI; serve as return rails for DH1/DH2 gate drives. |
| DH1, DH2 | High-side nMOSFET gate drivers | Bootstrap-powered (BST1/BST2); 10Ω pulldown resistance ensures safe turn-off during shutdown. |
| DL1, DL2 | Low-side nMOSFET gate drivers | BIAS-supplied; 3Ω pulldown resistance prevents shoot-through during startup and fault conditions. |
| CS1, CS2 | Positive current-sense inputs | Monitor inductor DCR or shunt resistor voltage; trigger 64–96mV overcurrent limit with cycle-by-cycle blanking. |
| FB1, FB2 | Feedback inputs | Regulate to 1.0V typical; enable fixed 5V/3.3V (via BIAS tie) or precision adjustable outputs with <0.01%/V line regulation. |
| PGOOD1, PGOOD2 | Open-drain power-good indicators | Assert low if output drops >15% below nominal; debounced 8–50µs to reject noise-induced false trips. |
| FSYNC | External synchronization input | Accepts 1.2–2.4MHz clock; resets internal oscillator on rising edge - enables deterministic timing in multi-converter systems. |
| EXTVCC | External bias supply input | Accepts 3.1–5.2V; disables internal BIAS LDO to reduce quiescent loss and improve light-load efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor design | Eliminates electrolytic bulk capacitors - enables ultra-compact, long-life layouts suitable for space-constrained industrial modules. |
| 180° interleaved operation | Reduces input ripple current amplitude by ~70% vs. in-phase dual buck, allowing smaller input capacitance and lower EMI filter cost. |
| Spread-spectrum modulation | ±6% frequency dithering lowers peak radiated emissions by up to 10dB - simplifies compliance with CISPR 22/32 Class B limits. |
| Programmable soft-start | Fixed 6ms ramp time (typ) - prevents inrush current damage to input capacitors and upstream converters during cold start. |
| Independent enable control | EN1/EN2 tolerate up to +42V; support flexible power sequencing (e.g., Buck 1 powers core logic before Buck 2 enables I/O rails). |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Dual-rail power for microcontroller (3.3V), CAN transceiver (5V), and sensor interface (adjustable 1.8V). IC Role / Device Role / Timing Role: Dual synchronous buck controller providing isolated, sequenced, and monitored 3.3V/5V rails with PGOOD signaling for system reset coordination. Use Value: 92% peak efficiency at full load and 20µA quiescent current in PFM extend runtime in battery-backed modules while meeting ISO 7637-2 pulse immunity. |
Use Scenario: Centralized power management for door module with LIN, LED drivers, and position sensors. IC Role / Device Role / Timing Role: High-voltage tolerant dual controller accepting 9–16V battery input, regulating 5V for MCU and 3.3V for communication ICs with 42V transient ride-through. Use Value: 180° phase shift minimizes input capacitor stress during load dumps; EXTVCC switchover improves standby efficiency below 1mA load. |
| Medical Point-of-Load Regulator | Test & Measurement Equipment |
Use Scenario: Low-noise dual supply for ADC reference (5V) and analog front-end (adjustable 2.5V). IC Role / Device Role / Timing Role: Precision feedback (±1% fixed outputs, 1.0V FB reference) and spread-spectrum operation suppress switching noise coupling into sensitive analog paths. Use Value: 50ns minimum on-time enables stable 2.5V/1A output from 24V input at 2.2MHz, reducing magnetic component size without sacrificing regulation accuracy. |
Use Scenario: Dual-channel bench power supply with programmable outputs and status monitoring. IC Role / Device Role / Timing Role: Dual independent buck controller enabling simultaneous 5V/3.3V rails with PGOOD1/PGOOD2 reporting and FSYNC synchronization to external master clock. Use Value: External frequency sync allows deterministic jitter-free operation across multiple units; FOSC resistor tuning supports custom frequency bins for spectral analysis applications. |
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+ | Lower 200kHz–1MHz frequency range; no spread-spectrum; 100ns min on-time | Better efficiency at high-current/low-frequency designs; unsuitable for ultra-compact 2.2MHz layouts | Select when board space permits larger magnetics and EMI filtering is less constrained. |
| TPS544B25RTER | Single-channel 4.5–18V input; 40A capability; integrated MOSFETs; PMBus interface | Higher integration but lacks dual-output independence and EXTVCC switchover | Choose for single-rail high-current applications where digital telemetry and dynamic margining are required. |
Compared with MAX17232ETIS+, MAX17233ETIR+ delivers higher switching frequency and EMI reduction via spread-spectrum, while TPS544B25RTER trades dual-rail flexibility for monolithic high-current density and digital control - making MAX17233ETIR+ optimal for compact, dual-output, analog-controlled industrial power stages.
Availability
MAX17233ETIR+ is available at Aetrix Electronics and suitable for industrial PLCs, automotive body controllers, medical point-of-load regulators, and test equipment requiring stable component supply with full lifecycle support.
Supply support for MAX17233ETIR+ 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) designs high-performance analog and mixed-signal ICs for power management, sensing, and communications in harsh environments.
The MAX1723x family targets high-density, high-reliability dual-output DC-DC conversion in industrial, automotive, and medical systems where input transients, thermal constraints, and EMI compliance are critical.
FAQ
What is the maximum supported input voltage for MAX17233ETIR+?
The MAX17233ETIR+ operates continuously from 3.5V to 36V input and is rated for 42V transient protection per Absolute Maximum Ratings. This allows direct connection to 24V industrial buses or 12V automotive systems with load-dump immunity, eliminating need for external TVS or pre-regulators in most cases. The device remains functional during short-duration 42V spikes without latch-up or degradation.
How does MAX17233ETIR+ achieve low quiescent current in light-load conditions?
MAX17233ETIR+ achieves 20µA typical quiescent current in PFM (skip) mode by disabling negative inductor current and skipping pulses at light loads. When both channels are disabled, it draws only 8µA. This behavior is enabled by driving FSYNC low and is validated across -40°C to +85°C. The internal BIAS LDO can be bypassed via EXTVCC to further reduce dissipation under partial-load conditions.
Can MAX17233ETIR+ generate non-standard output voltages like 1.8V or 2.5V?
Yes, MAX17233ETIR+ supports adjustable outputs from 1V to 10V using external resistive dividers on FB1 and FB2 pins, with a precise 1.0V (±1%) feedback reference. For example, a 1.8V output is achieved with R1=100kΩ and R2=22.1kΩ (1.0V × (1 + R1/R2)). Line regulation remains <0.01%/V and load regulation is ±0.01% over full current range, ensuring stability for FPGA core and ADC reference rails.
What is the purpose of the EXTVCC pin on MAX17233ETIR+?
The EXTVCC pin on MAX17233ETIR+ accepts an external 3.1V–5.2V supply (e.g., from one of its own outputs) to disable the internal 5V BIAS LDO. This reduces internal power dissipation and improves light-load efficiency by scaling quiescent current with duty cycle. If EXTVCC drops below 3.0V, the device automatically reverts to internal BIAS - providing seamless switchover without external supervision logic.
Does MAX17233ETIR+ support synchronization to an external clock source?
Yes, MAX17233ETIR+ supports external clock synchronization via the FSYNC pin, accepting 1.2–2.4MHz signals with 50% duty cycle. A rising edge on FSYNC resets the internal oscillator, enabling deterministic timing in multi-converter systems. Spread-spectrum is automatically disabled when FSYNC is active. Minimum sync pulse width is 100ns, and the FSYNC frequency must exceed the internal fSW by ≥10% for stable locking.
MAX17233ETIR+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- 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)
MAX17233ETIR+ FAQ
1.How can I place an order for MAX17233ETIR+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17233ETIR+ 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 MAX17233ETIR+ reliable?
The price and inventory of MAX17233ETIR+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17233ETIR+ is usually 5 days.
3.What payment methods are accepted for MAX17233ETIR+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17233ETIR+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17233ETIR+?
MAX17233ETIR+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17233ETIR+ 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 MAX17233ETIR+?
For technical support, including MAX17233ETIR+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17233ETIR+ requirements.
6.How does Aetrix verify that MAX17233ETIR+ is sourced from the original manufacturer or authorized distributors?
All MAX17233ETIR+ 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 MAX17233ETIR+ meets industry standards.
7.What is the process for return or replacement of MAX17233ETIR+?
All MAX17233ETIR+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17233ETIR+, 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 MAX17233ETIR+ part is unused and in its original packaging.
Return procedure for MAX17233ETIR+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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