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Analog Devices Inc./Maxim Integrated MAX17233ETIS+
- Part No.:
- MAX17233ETIS+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX17233ETIS+.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,766
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Product details
Overview
MAX17233ETIS+ 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 fixed 5V/3.3V or adjustable 1V–10V outputs per channel. It features 2.2MHz PWM/PSM operation, 95% max duty cycle, 50ns minimum on-time, and 42V transient protection - enabling compact, high-efficiency point-of-load regulation in automotive infotainment power supplies.
For engineers reviewing the MAX17233ETIS+ datasheet, MAX17233ETIS+ pinout, MAX17233ETIS+ application, or MAX17233ETIS+ equivalent, this page delivers verified electrical specs, validated 28-pin TQFN-EP package mapping, confirmed dual-buck timing architecture, and real-world design implications for distributed supply regulation and wall transformer replacement.
Technical Context
The MAX17233ETIS+ implements current-mode control with independent PWM/PSM mode selection per buck channel, where PFM disables negative inductor current and skips pulses at light loads to achieve 20µA quiescent current. Its 180° out-of-phase interleaving reduces input ripple and enables cascaded supply designs without external phase synchronization logic.
Each channel integrates high-side (DH1/DH2) and low-side (DL1/DL2) gate drivers with shoot-through protection, BST_ bootstrap supplies, and dedicated current-sense inputs (CS1/CS2) supporting DCR or shunt-based sensing. The device uses a shared 1V feedback reference (VFB = 1.0V typ) and supports external frequency setting via FOSC resistor or FSYNC synchronization up to 2.4MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V continuous, with 42V transient tolerance - enables direct connection to 24V industrial rails or 12V automotive systems without pre-regulation. |
| Switching Frequency | 1MHz to 2.2MHz (adjustable via FOSC resistor or FSYNC sync) - supports ultra-compact magnetics and EMI filtering for space-constrained applications. |
| Output Voltage Options | Fixed 5V ±1% (Buck 1) and 3.3V ±1% (Buck 2), or 1V–10V adjustable via resistive divider - eliminates need for external DACs in multi-rail FPGA or SoC power sequencing. |
| Quiescent Current | 20µA typical in PFM mode with one buck active - extends battery runtime in always-on subsystems like telematics wake-up circuits. |
| Thermal Protection | Thermal shutdown at +170°C with 20°C hysteresis - ensures reliable operation under sustained overload or poor PCB thermal layout. |
| Power-Good Monitoring | PGOOD1/PGOOD2 open-drain outputs with 85–95% rising/falling thresholds - provides deterministic system reset signaling without external comparators. |
| Minimum On-Time | 50ns typical - enables stable 5V-to-1.2V conversion at 2.2MHz, critical for high-step-down ratios in modern processor core supplies. |
Pinout & Package
MAX17233ETIS+ 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 a solid 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 outputs swinging from LX_ to VBST_; require ceramic BST capacitors and diodes for proper high-side turn-on. |
| DL1, DL2 | Low-side nMOSFET gate drivers | BIAS-supplied outputs swinging from PGND_ to VBIAS; include shoot-through protection to prevent cross-conduction. |
| CS1, CS2 | Positive current-sense inputs | Accept voltage drop across sense resistor or inductor DCR; enable accurate cycle-by-cycle current limiting down to 64mV threshold. |
| FB1, FB2 | Feedback inputs | Regulate to 1.0V typical; connect to BIAS for fixed 5V/3.3V outputs or to resistive dividers for adjustable 1V–10V range. |
| PGOOD1, PGOOD2 | Open-drain power-good indicators | Assert low during soft-start, undervoltage, or overvoltage faults; require external pull-up (≥100Ω) to logic-compatible voltage ≤5.5V. |
| EN1, EN2 | High-voltage tolerant enable inputs | Active-high, -0.3V to +42V absolute max rating - support direct connection to 24V system rails for sequenced power-up. |
| FOSC, FSYNC | Frequency configuration inputs | FOSC sets internal oscillator via resistor to AGND; FSYNC accepts external clock (1.2–2.4MHz) for synchronized multi-converter systems. |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase operation | Reduces input capacitor RMS current by ~30% and enables seamless cascading of Buck 1 output into Buck 2 input for triple-output designs. |
| All-ceramic capacitor support | Eliminates electrolytic bulk capacitors - improves reliability and lifetime in high-temperature automotive environments. |
| Spread-spectrum modulation | ±6% dithering of switching frequency lowers peak EMI emissions by 5–10dB, easing compliance with CISPR 25 Class 5 limits. |
| External VCC switchover (EXTVCC) | Automatically bypasses internal 5V BIAS LDO when EXTVCC ≥3.2V, reducing die temperature and improving light-load efficiency. |
| 50ns minimum on-time guarantee | Enables stable 2.2MHz operation at 5V-to-1.0V conversion (20% duty cycle), avoiding pulse-skipping instability in core rail supplies. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Dual-rail power for SoC (1.2V core, 3.3V I/O) and display interface (5V backlight, 1.8V LVDS) in head-unit designs. IC Role / Device Role / Timing Role: Primary dual-buck controller managing independent soft-start, PGOOD sequencing, and thermal derating per rail. Use Value: 2.2MHz operation allows 2.2µH inductors and 22µF ceramic output caps per rail, shrinking total solution size by 40% vs. 500kHz alternatives. |
Use Scenario: Distributed 5V and 3.3V supplies for isolated analog front-ends and digital logic in modular I/O cards. IC Role / Device Role / Timing Role: Point-of-load regulator with 42V transient protection handling 24V field bus surges without external TVS. Use Value: 95% max duty cycle maintains regulation during brownout events (e.g., 24V dropping to 3.5V), preventing system resets. |
| Medical Portable Monitor | Smart Building Sensor Hub |
|
Use Scenario: Battery-backed dual output for OLED display (5V) and low-power MCU (3.3V) with always-on wake-up capability. IC Role / Device Role / Timing Role: Ultra-low IQ controller enabling 20µA system sleep current while maintaining regulated outputs. Use Value: 8µA shutdown current extends Li-ion battery life beyond 12 months in standby, meeting IEC 62304 low-power requirements. |
Use Scenario: Wall-transformer-fed 5V/3.3V rails powering Zigbee/Thread radios, environmental sensors, and flash memory. IC Role / Device Role / Timing Role: High-efficiency AC/DC secondary-side controller replacing discrete buck ICs and external compensation networks. Use Value: Simple RC compensation (COMP1/COMP2 pins) eliminates need for op-amp-based type-II/III networks, cutting BOM cost by $0.35/unit. |
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; identical pinout and feature set otherwise. | Better suited for high-efficiency, low-EMI applications where board space permits larger inductors/caps. | Select MAX17232ETIS+ when EMI requirements are less stringent and thermal budget favors lower switching losses. |
| TPS544B25RTER | Single-channel 4A buck with PMBus interface; requires two units for dual-rail; no integrated 5V BIAS LDO. | Targeted at digitally controlled systems needing telemetry, margining, and fault logging - not pin-compatible. | Choose TPS544B25RTER only when digital monitoring and programmability outweigh integration and cost benefits of MAX17233ETIS+. |
Compared with MAX17232ETIS+, MAX17233ETIS+ delivers higher-frequency operation and spread-spectrum EMI reduction at the cost of slightly lower peak efficiency; versus TPS544B25RTER, it offers true dual-rail integration and embedded bias regulation but lacks digital control interfaces.
Availability
MAX17233ETIS+ is available at Aetrix Electronics and suitable for automotive infotainment power, industrial PLC I/O modules, and medical portable monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX17233ETIS+ 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 precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX1723x family targets high-density, high-reliability DC-DC conversion in space- and thermal-constrained systems - specifically engineered for dual-rail power delivery with minimal external components and robust fault protection.
FAQ
What is the maximum supported switching frequency for MAX17233ETIS+?
The MAX17233ETIS+ supports an internal switching frequency range of 1MHz to 2.2MHz, adjustable via the FOSC pin resistor. When synchronized externally, FSYNC accepts signals from 1.2MHz to 2.4MHz. The 2.2MHz upper limit enables ultra-compact magnetics and reduced output capacitance, making MAX17233ETIS+ ideal for high-density layouts where board area is constrained.
Does MAX17233ETIS+ support both fixed and adjustable output voltages?
Yes, MAX17233ETIS+ supports fixed 5V output on Buck 1 (via FB1-to-BIAS connection) and fixed 3.3V on Buck 2 (via FB2-to-BIAS), each with ±1% accuracy. For adjustable operation, connecting FB1/FB2 to resistive dividers between OUT1/OUT2 and AGND enables precise 1V–10V output programming - all using the same 1.0V internal reference, ensuring consistent regulation across both channels.
How does the EXTVCC pin function on MAX17233ETIS+?
The EXTVCC pin on MAX17233ETIS+ enables automatic switchover from the internal 5V BIAS LDO to an external 3.1V–5.2V supply. When EXTVCC rises above 3.2V, the internal LDO shuts off, reducing die temperature and improving light-load efficiency. This feature allows MAX17233ETIS+ to use one buck output (e.g., 5V rail) to power its own bias circuitry - simplifying system-level power architecture.
What thermal protection mechanisms are built into MAX17233ETIS+?
MAX17233ETIS+ incorporates cycle-by-cycle current limiting, thermal shutdown at +170°C (with 20°C hysteresis), and input overvoltage/undervoltage lockout. The exposed pad (EP) provides a low-thermal-resistance path (θJC = 3°C/W) to the PCB ground plane. These protections ensure safe operation during overload, ambient temperature excursions, or inadequate heatsinking - critical for unattended industrial deployments.
Can MAX17233ETIS+ operate with only one buck channel enabled?
Yes, MAX17233ETIS+ supports independent channel control via EN1 and EN2. With only Buck 2 enabled and no load, quiescent current drops to 20µA typical; with both channels disabled, it falls to 8µA typical. This capability allows dynamic power partitioning - for example, keeping the 3.3V rail active for microcontroller wake-up while disabling the 5V rail - extending battery life in portable equipment using MAX17233ETIS+.
MAX17233ETIS+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX17233ETIS+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17233ETIS+ 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+ reliable?
The price and inventory of MAX17233ETIS+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17233ETIS+ is usually 5 days.
3.What payment methods are accepted for MAX17233ETIS+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17233ETIS+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17233ETIS+?
MAX17233ETIS+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17233ETIS+ 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+?
For technical support, including MAX17233ETIS+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17233ETIS+ requirements.
6.How does Aetrix verify that MAX17233ETIS+ is sourced from the original manufacturer or authorized distributors?
All MAX17233ETIS+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX17233ETIS+?
All MAX17233ETIS+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17233ETIS+, 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+ part is unused and in its original packaging.
Return procedure for MAX17233ETIS+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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